From nobody Mon May 1 12:30:25 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4CF4812E046; Mon, 1 May 2017 12:30:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pQ_MkFUDjEw0; Mon, 1 May 2017 12:30:22 -0700 (PDT) Received: from alln-iport-4.cisco.com (alln-iport-4.cisco.com [173.37.142.91]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9DE5C1296CD; Mon, 1 May 2017 12:27:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=4836; q=dns/txt; s=iport; t=1493666861; x=1494876461; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=Qs8WCsKjh7c7N+Ty8DX1w8+i3AmD1/LhScHr1nWOv5I=; b=hi8P5NvD0Hrrs7Ml+/oWK0/f/lm9TqWC73ohM4hJ/+aQVkp6BGW0Mt6q TgZy84zfXNAhcazty01FSFHSugs4g+aHKKpPMXf6jSuRc7D0saSpIKxnD 1uFLMBtGm1XoBFEmxvLO3T6doS2vMQn+2heQq4qxgCvnxW7AXq9XmPcog c=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DfAQBxiwdZ/5FdJa1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1VigQwHg2GKGJEsIYgijUuCDyyFeAIahCE/GAECAQEBAQEBAWs?= =?us-ascii?q?ohRUBAQEBAgEjEUUFCwIBCBQEAgImAgICHxEVEAIEDgUUB4lsAw0IDq4ZgiaHK?= =?us-ascii?q?A2DWwEBAQEBAQEBAQEBAQEBAQEBAQEBHoELhVSBXisLgmWCVIIPgwYugjEFiT2?= =?us-ascii?q?NGIZDOwGHGoJphD+EToICVYRiiiWLHYkPAR84gQpvFVYBhl11AYY7K4EDgQ0BA?= =?us-ascii?q?QE?= X-IronPort-AV: E=Sophos;i="5.37,401,1488844800"; d="scan'208";a="418253566" Received: from rcdn-core-9.cisco.com ([173.37.93.145]) by alln-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 May 2017 19:27:40 +0000 Received: from XCH-RTP-006.cisco.com (xch-rtp-006.cisco.com [64.101.220.146]) by rcdn-core-9.cisco.com (8.14.5/8.14.5) with ESMTP id v41JReQ2016974 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 1 May 2017 19:27:40 GMT Received: from xch-rtp-010.cisco.com (64.101.220.150) by XCH-RTP-006.cisco.com (64.101.220.146) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 1 May 2017 15:27:39 -0400 Received: from xch-rtp-010.cisco.com ([64.101.220.150]) by XCH-RTP-010.cisco.com ([64.101.220.150]) with mapi id 15.00.1210.000; Mon, 1 May 2017 15:27:39 -0400 From: "Stefano Previdi (sprevidi)" To: Brian Carpenter CC: "gen-art@ietf.org" , "draft-ietf-spring-resiliency-use-cases.all@ietf.org" , "spring@ietf.org" Thread-Topic: Genart last call review of draft-ietf-spring-resiliency-use-cases-08 Thread-Index: AQHSwh8hRjkugGY04U2GHF2gyDfZEqHgIMqA Date: Mon, 1 May 2017 19:27:39 +0000 Message-ID: <52CBC7CD-A790-4470-ADBB-D424E9F219BC@cisco.com> References: <149360420729.9840.1135726446843394242@ietfa.amsl.com> In-Reply-To: <149360420729.9840.1135726446843394242@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.204.252] Content-Type: text/plain; charset="utf-8" Content-ID: <0183D2A04B6CD74CA18C6E1EE1ED9144@emea.cisco.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-resiliency-use-cases-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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<149360420729.9840.1135726446843394242@ietfa.amsl.com> <52CBC7CD-A790-4470-ADBB-D424E9F219BC@cisco.com> Cc: "gen-art@ietf.org" , "draft-ietf-spring-resiliency-use-cases.all@ietf.org" , "spring@ietf.org" From: Brian E Carpenter Organization: University of Auckland Message-ID: <804036b7-1359-c08d-4b77-e81105ac5df4@gmail.com> Date: Tue, 2 May 2017 08:02:03 +1200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <52CBC7CD-A790-4470-ADBB-D424E9F219BC@cisco.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-resiliency-use-cases-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 May 2017 20:04:41 -0000 Stefano, I won't argue further about the general issues, they are really between you and the ADs. About this: =2E.. >> Minor issue: >> ------------ >> >> The text of section 3 doesn't explain what requirements for SPRING it >> generates. Really it just describes what any IGP will do anyway. >=20 >=20 > not really. Igp=E2=80=99s compute Dijkstra-based shortest paths. Igp=E2= =80=99s do not compute repair paths (whatever flavor: dual, parallel, dis= joint, etc). Yes, but that is a comment on DV or SPF algorithms: in principle an IGP c= ould use other algorithms, should they be invented. Indeed, you refer to = "Automated computation by the IGP." >> How does that impact SPRING? If there is no impact, please say so! >=20 >=20 > spring is about source routing and resiliency makes use of source routi= ng. Resiliency makes use of source routing through SR. Right, but you don't state any *requirements* for SPRING that result from= this case, except the very general statement before section 3.1. Maybe that does tra= nslate into specific requirements, but I don't see how. Brian From nobody Mon May 1 13:23:14 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DA4DA12EAF9; Mon, 1 May 2017 13:23:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -12.624 X-Spam-Level: X-Spam-Status: No, score=-12.624 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kdAYqpeYTCUp; Mon, 1 May 2017 13:23:04 -0700 (PDT) Received: from alln-iport-3.cisco.com (alln-iport-3.cisco.com [173.37.142.90]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4F22712941D; Mon, 1 May 2017 13:20:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2062; q=dns/txt; s=iport; t=1493670005; x=1494879605; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=9umsEeLkFStjfLUlmvrAEZJwjLp/mLP8uxekKBkEYE8=; b=CXtDopF6CiRFgXCIegiAzhSc5KkiRSQPtAOOrLEnox33UMgqRZQCQRVL 9kCwguKekR6udIR662cNDPZOgz1Q+n9eAwBJOfXS4SemQLlU+kBGPWCo3 9syBz6jX2d5OV7y6PkY4jwPJibi8H74iBaJV4N4iyvahXVRV2gU1VsBht g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DxAQBQlwdZ/51dJa1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1WBbgeDYYoYkS0hiCKNS4IPhiQCGoQhPxgBAgEBAQEBAQFrKIU?= =?us-ascii?q?VAQEBAQIBIxFFBQsCAQgYAgImAgICHxEVEAIEDgWKBwMNCK4wgiaHLA2DWwEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEBAQEBAR2BC4VUggkLgmWCVIIPgwYugjEBBIk9k1s7AY5?= =?us-ascii?q?ChE6CAoU3iiWLHYkPAR84gQpvFVYBhl11AYgrgQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.37,401,1488844800"; d="scan'208";a="419753318" Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by alln-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 May 2017 20:20:04 +0000 Received: from XCH-RTP-010.cisco.com (xch-rtp-010.cisco.com [64.101.220.150]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id v41KK4lu007190 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 1 May 2017 20:20:04 GMT Received: from xch-rtp-010.cisco.com (64.101.220.150) by XCH-RTP-010.cisco.com (64.101.220.150) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 1 May 2017 16:20:03 -0400 Received: from xch-rtp-010.cisco.com ([64.101.220.150]) by XCH-RTP-010.cisco.com ([64.101.220.150]) with mapi id 15.00.1210.000; Mon, 1 May 2017 16:20:03 -0400 From: "Stefano Previdi (sprevidi)" To: Brian E Carpenter CC: "gen-art@ietf.org" , "draft-ietf-spring-resiliency-use-cases.all@ietf.org" , "spring@ietf.org" Thread-Topic: Genart last call review of draft-ietf-spring-resiliency-use-cases-08 Thread-Index: AQHSwh8hRjkugGY04U2GHF2gyDfZEqHgIMqAgAAJn4CAAAUFgA== Date: Mon, 1 May 2017 20:20:03 +0000 Message-ID: <5606F41A-339D-4DA3-9192-4D0972092FF4@cisco.com> References: <149360420729.9840.1135726446843394242@ietfa.amsl.com> <52CBC7CD-A790-4470-ADBB-D424E9F219BC@cisco.com> <804036b7-1359-c08d-4b77-e81105ac5df4@gmail.com> In-Reply-To: <804036b7-1359-c08d-4b77-e81105ac5df4@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.204.252] Content-Type: text/plain; charset="utf-8" Content-ID: <0D91D06E377E4245B2CEDDC9780B7DCE@emea.cisco.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-resiliency-use-cases-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 May 2017 20:23:06 -0000 DQo+IE9uIE1heSAxLCAyMDE3LCBhdCAxMDowMiBQTSwgQnJpYW4gRSBDYXJwZW50ZXIgPGJyaWFu LmUuY2FycGVudGVyQGdtYWlsLmNvbT4gd3JvdGU6DQo+IA0KPiBTdGVmYW5vLA0KPiANCj4gSSB3 b24ndCBhcmd1ZSBmdXJ0aGVyIGFib3V0IHRoZSBnZW5lcmFsIGlzc3VlcywgdGhleSBhcmUgcmVh bGx5DQo+IGJldHdlZW4geW91IGFuZCB0aGUgQURzLiBBYm91dCB0aGlzOg0KPiANCj4gLi4uDQo+ Pj4gTWlub3IgaXNzdWU6DQo+Pj4gLS0tLS0tLS0tLS0tDQo+Pj4gDQo+Pj4gVGhlIHRleHQgb2Yg c2VjdGlvbiAzIGRvZXNuJ3QgZXhwbGFpbiB3aGF0IHJlcXVpcmVtZW50cyBmb3IgU1BSSU5HIGl0 DQo+Pj4gZ2VuZXJhdGVzLiBSZWFsbHkgaXQganVzdCBkZXNjcmliZXMgd2hhdCBhbnkgSUdQIHdp bGwgZG8gYW55d2F5Lg0KPj4gDQo+PiANCj4+IG5vdCByZWFsbHkuIElncOKAmXMgY29tcHV0ZSBE aWprc3RyYS1iYXNlZCBzaG9ydGVzdCBwYXRocy4gSWdw4oCZcyBkbyBub3QgY29tcHV0ZSByZXBh aXIgcGF0aHMgKHdoYXRldmVyIGZsYXZvcjogZHVhbCwgcGFyYWxsZWwsIGRpc2pvaW50LCBldGMp Lg0KPiANCj4gWWVzLCBidXQgdGhhdCBpcyBhIGNvbW1lbnQgb24gRFYgb3IgU1BGIGFsZ29yaXRo bXM6IGluIHByaW5jaXBsZSBhbiBJR1AgY291bGQgdXNlIG90aGVyIGFsZ29yaXRobXMsIHNob3Vs ZCB0aGV5IGJlIGludmVudGVkLiBJbmRlZWQsIHlvdSByZWZlciB0byAiQXV0b21hdGVkIGNvbXB1 dGF0aW9uIGJ5IHRoZSBJR1Au4oCdDQoNCg0Kd2VsbCwgdGhlIHdob2xlIEZSUiBhbmQgTEZBIHN0 b3J5IGlzIGJhc2VkIG9uIExTIHByb3RvY29scyBzbyBEViBpcyBvdXQgb2YgdGhlIHBpY3R1cmUg aGVyZS4NCg0KDQo+IA0KPj4+IEhvdyBkb2VzIHRoYXQgaW1wYWN0IFNQUklORz8gSWYgdGhlcmUg aXMgbm8gaW1wYWN0LCBwbGVhc2Ugc2F5IHNvIQ0KPj4gDQo+PiANCj4+IHNwcmluZyBpcyBhYm91 dCBzb3VyY2Ugcm91dGluZyBhbmQgcmVzaWxpZW5jeSBtYWtlcyB1c2Ugb2Ygc291cmNlIHJvdXRp bmcuIFJlc2lsaWVuY3kgbWFrZXMgdXNlIG9mIHNvdXJjZSByb3V0aW5nIHRocm91Z2ggU1IuDQo+ IA0KPiBSaWdodCwgYnV0IHlvdSBkb24ndCBzdGF0ZSBhbnkgKnJlcXVpcmVtZW50cyogZm9yIFNQ UklORyB0aGF0IHJlc3VsdCBmcm9tIHRoaXMgY2FzZSwNCj4gZXhjZXB0IHRoZSB2ZXJ5IGdlbmVy YWwgc3RhdGVtZW50IGJlZm9yZSBzZWN0aW9uIDMuMS4gTWF5YmUgdGhhdCBkb2VzIHRyYW5zbGF0 ZQ0KPiBpbnRvIHNwZWNpZmljIHJlcXVpcmVtZW50cywgYnV0IEkgZG9uJ3Qgc2VlIGhvdy4NCg0K DQp0aGUgZ2VuZXJpYyByZXF1aXJlbWVudCBpcyB0aGUgYWJpbGl0eSB0byBpbnN0YW50aWF0ZSBz b3VyY2Ugcm91dGVkIHBhdGhzLiBUaGVzZSBzb3VyY2Ugcm91dGVkIHBhdGhzLCBpbiB0aGUgZnJh bWV3b3JrIG9mIHRoaXMgZHJhZnQsIGFyZSBmb3IgTEZBcy4NCg0KVGhhbmtzLg0Kcy4NCg0KDQoN Cj4gDQo+ICAgQnJpYW4NCj4gDQoNCg== From nobody Tue May 2 07:43:22 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 85FB2131650; Tue, 2 May 2017 07:43:14 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.50.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149373619447.9784.10213194701170695553@ietfa.amsl.com> Date: Tue, 02 May 2017 07:43:14 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-resiliency-use-cases-09.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 May 2017 14:43:15 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking of the IETF. Title : Resiliency use cases in SPRING networks Authors : Clarence Filsfils Stefano Previdi Bruno Decraene Rob Shakir Filename : draft-ietf-spring-resiliency-use-cases-09.txt Pages : 11 Date : 2017-05-02 Abstract: This document identifies and describes the requirements for a set of use cases related to network resiliency on Segment Routing (SPRING) networks. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-resiliency-use-cases/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-resiliency-use-cases-09 https://datatracker.ietf.org/doc/html/draft-ietf-spring-resiliency-use-cases-09 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-resiliency-use-cases-09 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue May 2 07:48:34 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B48BA128854; Tue, 2 May 2017 07:48:25 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.50.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149373650570.9931.16082383836388368579@ietfa.amsl.com> Date: Tue, 02 May 2017 07:48:25 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-ldp-interop-07.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 May 2017 14:48:26 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking of the IETF. Title : Segment Routing interworking with LDP Authors : Clarence Filsfils Stefano Previdi Ahmed Bashandy Bruno Decraene Stephane Litkowski Filename : draft-ietf-spring-segment-routing-ldp-interop-07.txt Pages : 20 Date : 2017-05-02 Abstract: A Segment Routing (SR) node steers a packet through a controlled set of instructions, called segments, by prepending the packet with an SR header. A segment can represent any instruction, topological or service-based. SR allows to enforce a flow through any topological path and service chain while maintaining per-flow state only at the ingress node to the SR domain. The Segment Routing architecture can be directly applied to the MPLS data plane with no change in the forwarding plane. This drafts describes how Segment Routing operates in a network where LDP is deployed and in the case where SR-capable and non-SR-capable nodes coexist. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-segment-routing-ldp-interop-07 https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-ldp-interop-07 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-ldp-interop-07 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 May 2017 14:49:52 -0000 this version integrates the latest comments from GENART, OPSDIR and RTGDIR = reviews. s. > On May 2, 2017, at 4:43 PM, internet-drafts@ietf.org wrote: >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Source Packet Routing in Networking of t= he IETF. >=20 > Title : Resiliency use cases in SPRING networks > Authors : Clarence Filsfils > Stefano Previdi > Bruno Decraene > Rob Shakir > Filename : draft-ietf-spring-resiliency-use-cases-09.txt > Pages : 11 > Date : 2017-05-02 >=20 > Abstract: > This document identifies and describes the requirements for a set of > use cases related to network resiliency on Segment Routing (SPRING) > networks. >=20 >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-spring-resiliency-use-cases/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-spring-resiliency-use-cases-09 > https://datatracker.ietf.org/doc/html/draft-ietf-spring-resiliency-use-ca= ses-09 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-resiliency-use-case= s-09 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > I-D-Announce mailing list > I-D-Announce@ietf.org > https://www.ietf.org/mailman/listinfo/i-d-announce > Internet-Draft directories: http://www.ietf.org/shadow.html > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt From nobody Tue May 2 07:53:21 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A1861314B0 for ; 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02 May 2017 14:49:21 +0000 Received: from XCH-RTP-008.cisco.com (xch-rtp-008.cisco.com [64.101.220.148]) by rcdn-core-10.cisco.com (8.14.5/8.14.5) with ESMTP id v42EnLUf023058 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Tue, 2 May 2017 14:49:21 GMT Received: from xch-rtp-010.cisco.com (64.101.220.150) by XCH-RTP-008.cisco.com (64.101.220.148) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 2 May 2017 10:49:20 -0400 Received: from xch-rtp-010.cisco.com ([64.101.220.150]) by XCH-RTP-010.cisco.com ([64.101.220.150]) with mapi id 15.00.1210.000; Tue, 2 May 2017 10:49:20 -0400 From: "Stefano Previdi (sprevidi)" To: SPRING WG Thread-Topic: I-D Action: draft-ietf-spring-segment-routing-ldp-interop-07.txt Thread-Index: AQHSw1MwnKbvXlQspkKwBO9Iu6Ep26HhYvcA Date: Tue, 2 May 2017 14:49:20 +0000 Message-ID: <88B9D3F3-3481-4CC7-B9EB-E3C93665C4FC@cisco.com> References: <149373650570.9931.16082383836388368579@ietfa.amsl.com> In-Reply-To: <149373650570.9931.16082383836388368579@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.231.30] Content-Type: text/plain; charset="us-ascii" Content-ID: <95BDA0B0DC5EA740970C472CCF97A0CB@emea.cisco.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [spring] I-D Action: draft-ietf-spring-segment-routing-ldp-interop-07.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 May 2017 14:53:20 -0000 this version integrates shepherd review comments. Thanks. s. > On May 2, 2017, at 4:48 PM, internet-drafts@ietf.org wrote: >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Source Packet Routing in Networking of t= he IETF. >=20 > Title : Segment Routing interworking with LDP > Authors : Clarence Filsfils > Stefano Previdi > Ahmed Bashandy > Bruno Decraene > Stephane Litkowski > Filename : draft-ietf-spring-segment-routing-ldp-interop-07.txt > Pages : 20 > Date : 2017-05-02 >=20 > Abstract: > A Segment Routing (SR) node steers a packet through a controlled set > of instructions, called segments, by prepending the packet with an SR > header. A segment can represent any instruction, topological or > service-based. SR allows to enforce a flow through any topological > path and service chain while maintaining per-flow state only at the > ingress node to the SR domain. >=20 > The Segment Routing architecture can be directly applied to the MPLS > data plane with no change in the forwarding plane. This drafts > describes how Segment Routing operates in a network where LDP is > deployed and in the case where SR-capable and non-SR-capable nodes > coexist. >=20 >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-in= terop/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-spring-segment-routing-ldp-interop= -07 > https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-l= dp-interop-07 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-routing-ldp= -interop-07 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > I-D-Announce mailing list > I-D-Announce@ietf.org > https://www.ietf.org/mailman/listinfo/i-d-announce > Internet-Draft directories: http://www.ietf.org/shadow.html > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt From nobody Tue May 2 09:57:52 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 7256213144B; Tue, 2 May 2017 09:57:47 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Stewart Bryant To: Cc: spring@ietf.org, draft-ietf-spring-ipv6-use-cases.all@ietf.org, ietf@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.50.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149374426742.21414.16408814015665498739@ietfa.amsl.com> Date: Tue, 02 May 2017 09:57:47 -0700 Archived-At: Subject: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 May 2017 16:57:47 -0000 Reviewer: Stewart Bryant Review result: Not Ready I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please treat these comments just like any other last call comments. For more information, please see the FAQ at . Document: draft-ietf-spring-ipv6-use-cases-?? Reviewer: Stewart Bryant Review Date: 2017-05-02 IETF LC End Date: 2017-05-04 IESG Telechat date: Not scheduled for a telechat Summary: I have a number of concerns about this draft, which I detail below. A significant part of the justification seems to evolve around the inability of MPLS to function in an IPv6 only network. This is something that the MPLS WG should provide expert input on. Major issues: In addition there are cases where the operators could have made the design choice to disable IPv4, for ease of management and scale (return to single-stack) or due to an address constraint, for example because they do not possess enough IPv4 addresses resources to number all the endpoints and other network elements on which they desire to run MPLS. SB> But as I show below MPLS WG either has fixed this or is very close SB> to fixing this, so I don't see how you can justify designing a SB> major modification to the IPv6 dataplane on the basis of the above SB> statement. =============== In such scenario the support for MPLS operations on an IPv6-only network would be required. However today's IPv6-only networks are not fully capable of supporting MPLS. There is ongoing work in the MPLS Working Group, described in [RFC7439] to identify gaps that must be addressed in order to allow MPLS-related protocols and applications to be used with IPv6-only networks. SB> That draft was published two years ago. An RFC was published to SB> address the LDP gap mid 2016. RFC7506 fixed the RAO in April 2015, SB> MIBs are being replaced by YANG. I am not sure you need GMPLS, SB> L2VPN or L3VPN in the application you cite. SB> SB> I think a more up to date evaluation of the ability of MPLS SB> to run in an IPv6 network is needed. SB> SB> Additionally if you are talking MPLS-SR then the shortfall is SB> different still because you rely on the SR extensions to the IGPs SB> and not the classic MPLS signalling protocols. ============ 2. There is a strict lack of an MPLS dataplane in a portion of the end to end path SB> It is not the lack of MPLS in a portion of the network, since you SB> can tunnel MPLS over IP. The constraint applies when you need SB> take an MPLS action at node that does not have MPLS forwarding logic. SB> I wonder how common this is in practise given that I understand that SB> other work in IPv6 SR is driving towards convincing people that SB> the number of actual SR actions on a path is tiny. 4. There is a need to connect millions of addressable segment endpoints, thus high routing scalability is a requirement. IPv6 addresses are inherently summarizable: a very large operator could scale by summarizing IPv6 subnets at various internal boundaries. This is very simple and is a basic property of IP routing. MPLS node segments are not summarizable. To reach the same scale, an operator would need to introduce additional complexity, such as mechanisms known with the industry term Seamless MPLS [I-D.ietf-mpls-seamless-mpls]. SB> As far as I can see that draft has died, indeed it died in 2014. SB> Assuming it has not be re-incarnated in another name, this calls SB> into question the validity of the use case. SB> SB> I think to compare apples with apples here, we need to take a SB> look at specific examples to verify that the scaling concern arises. SB> As part of that we need to consider whether the intrinsic hierarchy SB> MPLS, and the availability of MPLS context labels addresses the issue. SB> As far as I can see that draft has died, indeed it died in 2014. SB> Assuming it has not be re-incarnated in another name, this calls SB> into question the validity of the use case. SB> SB> I think to compare apples with apples here, we need to take a SB> look at specific examples to verify that the scaling concern arises. SB> As part of that we need to consider whether the intrinsic hierarchy SB> MPLS, and the availability of MPLS context labels addresses the issue. In any environment with requirements such as those listed above, an IPv6 data plane SB> No, an IPv6 dataplane extended to include source routing capability SB> ... You do not get this through an off the shelf IPv6 dataplane SB> other than perhaps MPLS/IPv6. SB> ... and we should not belittle the difficulty of doing the proposed SB> SRv6 extensions, not all h/w can easily do it, and a lot of h/w can SB> only introduce a tiny number of segments. provides a powerful combination of capabilities for a network operator to realize benefits in explicit routing, protection and restoration, high routing scalability, traffic engineering, service chaining, service differentiation and application flexibility via programmability. SB> There is a bit of an (unexplained) leap from the introduction of SB> IPv6 to the above set of use cases. ============ The use cases described in the section do not constitute an exhaustive list of all the possible scenarios; this section only includes some of the most common envisioned deployment models for IPv6 Segment Routing. In addition to the use cases described in this document the spring architecture should be able to be applied to all the use cases described in [RFC7855] for the spring MPLS data plane, when an IPv6 data plane is present. SB> The second sentence reduces to the need to make MPLS work in SB> an IPv6 environment. ========== The ability to steer traffic to an appropriate egress or utilize a specific type of media (e.g., low-power, WIFI, wired, femto-cell, bluetooth, MOCA, HomePlug, etc.) within the home itself are obvious cases which may be of interest to an application running within a home network. SB> So the interesting thing here is that to set up a SR you normally SB> need to know the topology so you can plan the path, but homenet SB> chose a distance vector protocol, which is a protocol genre that SB> normally does not understand the topology. ======== Information included in the spring header, whether imposed by the end-host itself, a customer edge router, or within the access network of the ISP, may be of use at the far ends of the data communication as well. For example, an application running on an end-host with application-support in a data center can utilize the spring header as a channel to include information that affects its treatment within the data center itself, allowing for application-level steering and load-balancing without relying upon implicit application classification techniques at the data-center edge. Further, as more and more application traffic is encrypted, the ability to extract (and include in the spring header) just enough information to enable the network and data center to load-balance and steer traffic appropriately becomes more and more important. SB> However there is a trust issue with sharing information in this way SB> and it was a breach of trust that caused the source routing feature SB> to be removed from IPv6 in the first place. SB> SB> For this to be a valid use case I think you need to address the SB> trust and security issues to explain why they are no longer relevant SB> or make it clear that they need to be addressed. ======== The need to setup a source-based path, going through some specific middle/intermediate points in the network may be related to different requirements: SB> There needs to be some discussion on the trust model here and SB> attack vectors associated with this proposal. ========== This document presents use cases to be considered by the spring architecture and potential IPv6 extensions. As such, it does not introduce any security considerations. However, there are a number of security concerns with source routing at the IP layer [RFC5095]. It is expected that any solution that addresses these use cases to also address any security concerns. SB> It is not clear that the introduction of this technology to these SB> applications does not introduce a solutions agnostic increase in SB> security risk. SB> Minor issues: The objective of this document is to illustrate some use cases that need to be taken into account by the Source Packet Routing in Networking (SPRING) architecture in the context of an IPv6 environment. SB> It is unclear whether it is feeding the SR architecture (which is SB> currently in AD evaluation) or the SRv6 design. SB> SB> It seems a bit late to be progressing this if it is a requirement SB> on the architecture. ================ Source Packet Routing in Networking (SPRING) architecture leverages the source routing paradigm. An ingress node steers a packet through a controlled set of instructions, called segments, by prepending the packet with SPRING header. SB> That is what I think it should do, but that is not the design direction SB> of the current IPv6 proposal. The design of record modifies the SB> IPv6 header. ========== In today's networks, source routing is typically accomplished by encapsulating IP packets in MPLS LSPs that are signaled via RSVP-TE. SB> There is an interesting question as to whether RSVP-TE is a SB> source routing paradygm or simply an explicit routing paradygm. SB> Source routing is more commonly associated with a route imposed SB> on a packet rather than the identify of a route being imposed on SB> a packet. 3. There is a need or desire to remove routing state from any node other than the source, such that the source is the only node that knows and will know the path a packet will take, a priori SB> That is a SR goal, not a goal specific to IPv6 ========== A spring enabled home provides the ability to steer traffic into a specific path from end-hosts in the home, or from a customer edge router in the home. SB> Where does Babel fit into this? Isn't the purpose of Babel SB> to do this in a standard IPv6 dataplane? ========= Some Data Center operators are transitioning their Data Center infrastructure from IPv4 to native IPv6 only, in order to cope with IPv4 address depletion and to achieve larger scale. In such environment, source routing (through Segment Routing IPv6) can be used to steer traffic across specific paths through the network. SB> I do not see how the first sentence leads to the second. ========== In an environment, where each single cache system can be uniquely identified by its own IPv6 address, a list containing a sequence of the caches in a hierarchy can be built. At each node (cache) in the list, the presence of the requested content if checked. If the requested content is found at the cache (cache hits scenario) the sequence ends, even if there are more nodes in the list; otherwise next element in the list (next node/cache) is examined. SB> This needs some discussion on the alternative approaches: SB> for example service function chaining and an ICN overlay. Nits/editorial comments: Therefore, there are scenarios where it may be possible to run IPv6 on top of MPLS, and as such, the MPLS Segment Routing architecture SB> I think that is a design rather than an architecture. ============= This is an another example of scenario where a solution relying on IPv6 without requiring the use of MPLS could represent a valid option to solve the problem and meet operators' requirements. SB> "could" is not a particularly strong justification. From nobody Wed May 3 07:39:42 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C7DC129BCE; Wed, 3 May 2017 07:39:40 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Carlos Martinez To: Cc: spring@ietf.org, draft-ietf-spring-ipv6-use-cases.all@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.50.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149382238053.21480.11427512893840375883@ietfa.amsl.com> Date: Wed, 03 May 2017 07:39:40 -0700 Archived-At: Subject: [spring] Opsdir last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 May 2017 14:39:41 -0000 Reviewer: Carlos Martinez Review result: Has Issues I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review. Document editors and WG chairs should treat these comments just like any other last call comments. Review result: Ready with issues First of all I would like to thank the authors for their hard work and the insight they offer in this document. I'm a sort of outsider to the source routing scene but I have been following it for some time. After reading the document I am left with the impression that the case for the IPv6 dataplane is being pushed just too hard. I´m not saying that there is no case but that the document tries just too hard at it, making it unnecessarily hard to read. The document heavily references active drafts that have yet to become RFCs, making it hard for me to give a full "Ready" status I'm a bit concerned about the use of the word "obvious" as it is used in Section 2.1. What is obvious today may not be in one, two or three years from now. Finally, and this is just an IMHO, the cases are presented from a "33 thousand feet view". I feel this doesn´t help someone just coming on board the topic and I believe the document would highly benefit from a more detailed, more specific and developed use case. Thanks again! -Carlos From nobody Wed May 3 09:59:37 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A6D5129AEE; Wed, 3 May 2017 09:59:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.021 X-Spam-Level: X-Spam-Status: No, score=-2.021 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=juniper.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dO1bc7NiNwhY; Wed, 3 May 2017 09:59:33 -0700 (PDT) Received: from NAM03-BY2-obe.outbound.protection.outlook.com (mail-by2nam03on0101.outbound.protection.outlook.com [104.47.42.101]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4313F129447; 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 May 2017 16:59:36 -0000 --_000_BN3PR05MB270651953B3F81993F2F27F6D5160BN3PR05MB2706namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior s= hould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_BN3PR05MB270651953B3F81993F2F27F6D5160BN3PR05MB2706namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Hi Authors,
 
 
When there are multiple anycast IP addresses assigned to different nod= es and one or more nodes
do not advertise a Prefix SID for that anycast address but other nodes= advertise a prefix-sid, there is a possibility
of different implementations behaving differently with respect to prog= ramming the labelled routes.
 
This scenario should be considered as a prefix conflict and the behav= ior should be addressed in the draft.
I suggest to update section 3.2.1 with the relevant text to describe t= he behavior.
 
 
Rgds
Shraddha
 
 --_000_BN3PR05MB270651953B3F81993F2F27F6D5160BN3PR05MB2706namp_-- From nobody Wed May 3 11:19:39 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 55B7812778D; Wed, 3 May 2017 11:19:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HMbwfut06Z5T; Wed, 3 May 2017 11:19:35 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 219C612009C; Wed, 3 May 2017 11:17:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=9043; q=dns/txt; s=iport; t=1493835443; x=1495045043; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=8ezcopVdiWe+Mlx+nYEEC2kXIyOnwh3mJOZ4Lv7+63k=; b=RzGT28h8Z74OOfivnlvLItj7PLFR1xjODFoXrx34tnh0n5qqjHmkcbqn A+kSHOtV2SXiXRA0qWj53f2apF+tq59+QdxtwlUAy8Ik7ZOEglnQZlc4U cderzrbI+rsk2IEXKmvy0zH34sFZbI/NhcdHCr5A+hC6VePOg09uCoCe6 A=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DSAABvHgpZ/5pdJa1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm48K2KBDAeNeZFSkDeFN4IPhiQChEA/GAECAQEBAQEBAWsohRU?= =?us-ascii?q?BAQEBAy1MEAIBCBEEAQEoBzIUCQgBAQQBDQUIihmzUYpsAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBHYZfhHmERgEBUYUvBZ1cAZMKgguJHoZAiHmLOgEfOFkxbxWFNhy?= =?us-ascii?q?BY3aGMIEhgQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.38,284,1491264000"; d="scan'208,217";a="243877283" Received: from rcdn-core-3.cisco.com ([173.37.93.154]) by rcdn-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 May 2017 18:17:00 +0000 Received: from XCH-ALN-001.cisco.com (xch-aln-001.cisco.com [173.36.7.11]) by rcdn-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id v43IH0Ui015388 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 3 May 2017 18:17:00 GMT Received: from xch-aln-001.cisco.com (173.36.7.11) by XCH-ALN-001.cisco.com (173.36.7.11) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 3 May 2017 13:16:59 -0500 Received: from xch-aln-001.cisco.com ([173.36.7.11]) by XCH-ALN-001.cisco.com ([173.36.7.11]) with mapi id 15.00.1210.000; Wed, 3 May 2017 13:16:59 -0500 From: "Les Ginsberg (ginsberg)" To: Shraddha Hegde , "draft-ietf-spring-conflict-resolution@ietf.org" CC: "spring@ietf.org" Thread-Topic: Mail regarding draft-ietf-spring-conflict-resolution Thread-Index: AdLEK6gAqg4DUgoVTleNTb+KJq8tswADTO5A Date: Wed, 3 May 2017 18:16:59 +0000 Message-ID: <97e3921eb1014725a484156d96191570@XCH-ALN-001.cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.3.7] Content-Type: multipart/alternative; boundary="_000_97e3921eb1014725a484156d96191570XCHALN001ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 May 2017 18:19:37 -0000 --_000_97e3921eb1014725a484156d96191570XCHALN001ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Shraddha - There is a misunderstanding on your part. It would be good if you read Sect= ion 3.3.8. Guaranteeing Database Consistency again. In short, it does not matter whether you do or do not advertise a prefix SI= D for a prefix which you own. What matters is that all routers populate the= mapping entry database consistent w Section 3.3.8 and that each router app= lies the conflict resolution rules in a consistent manner. Then all routers= will be using the same prefix/SID pair in forwarding. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_97e3921eb1014725a484156d96191570XCHALN001ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Shraddha –

 <= /p>

There is a misunderstandi= ng on your part. It would be good if you read Section 3.3.8.  Guarante= eing Database Consistency again.

 <= /p>

In short, it does not mat= ter whether you do or do not advertise a prefix SID for a prefix which you = own. What matters is that all routers populate the mapping entry database consistent w Section 3.3.8 and that each router applies the= conflict resolution rules in a consistent manner. Then all routers will be= using the same prefix/SID pair in forwarding.

 <= /p>

   Les

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addr= esses assigned to different nodes and one or more nodes

do not advertise a Prefix SID for that = anycast address but other nodes advertise a prefix-sid, there is a possibil= ity

of different implementations behaving d= ifferently with respect to programming the labelled routes.

 

This scenario should be considered as a= prefix conflict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with = the relevant text to describe the behavior.

 

 

Rgds

Shraddha

 

--_000_97e3921eb1014725a484156d96191570XCHALN001ciscocom_-- From nobody Wed May 3 22:16:17 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8571F129422; Wed, 3 May 2017 22:16:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.021 X-Spam-Level: X-Spam-Status: No, score=-2.021 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=juniper.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w4t8UjWSMYYx; Wed, 3 May 2017 22:16:13 -0700 (PDT) Received: from NAM01-SN1-obe.outbound.protection.outlook.com (mail-sn1nam01on0117.outbound.protection.outlook.com [104.47.32.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 19C2D129B39; 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 May 2017 05:16:15 -0000 --_000_BN3PR05MB2706A0AB65F01D367E29C8C3D5EA0BN3PR05MB2706namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Les, >From what you describe in section 3.3.8, all the SIDs attached to prefixes = are fed into the database. The example I am talking about, 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 3. Prefix 1.1.1.1 advertised from node C with SID 10 The advertisements 2 and 3 are fed into the mapping database and 1 isn't. The conflict resolution does not detect any conflict with the above adverti= sements and For prefix 1.1.1.1 /SID 10 is chosen. All this is fine but the problem is in programming the forwarding plane. Lets say for a certain node E in the network node A is the nexthop for 1.1.= 1.1. How would node E program its forwarding plane? Node E should recognize the conflict between node A, Node B and C and progr= am the SID 10 with a pop and forward instead of looking into the P and E flags of = the SID 10? This is good enough detail, that should be explained in the draft instead o= f leaving it to the Imagination of implementers. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 3, 2017 11:47 PM To: Shraddha Hegde ; draft-ietf-spring-conflict-resol= ution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - There is a misunderstanding on your part. It would be good if you read Sect= ion 3.3.8. Guaranteeing Database Consistency again. In short, it does not matter whether you do or do not advertise a prefix SI= D for a prefix which you own. What matters is that all routers populate the= mapping entry database consistent w Section 3.3.8 and that each router app= lies the conflict resolution rules in a consistent manner. Then all routers= will be using the same prefix/SID pair in forwarding. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_BN3PR05MB2706A0AB65F01D367E29C8C3D5EA0BN3PR05MB2706namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Les,

 

From what you describe in section 3.3= .8, all the SIDs attached to prefixes are fed into the database.=

The example I am talking about,

 

1.prefix 1.1.1.1 advertised from node= A with no SID

2.Prefix 1.1.1.1 advertised from node= B with SID 10

3. Prefix 1.1.1.1 advertised from nod= e C with SID 10

 

The advertisements 2 and 3 are fed in= to the mapping database and 1 isn’t.

 

The conflict resolution does not dete= ct any conflict with the above advertisements and

For prefix 1.1.1.1 /SID 10 is chosen.=

All this is fine but the problem is i= n programming the forwarding plane.

 

Lets say for a certain node E in the = network node A is the nexthop for 1.1.1.1.

How would node E program its forwardi= ng plane?

 

Node E should recognize the conflict = between node A, Node B and C and program the

SID 10 with a pop and forward instead= of looking into the P and E flags of the SID 10?

 

This is good enough detail, that shou= ld be explained in the draft instead of leaving it to the=

Imagination of implementers.

 

Rgds

Shraddha

 

 

 

 

From: Les Ginsberg (ginsberg) [mailt= o:ginsberg@cisco.com]
Sent: Wednesday, May 3, 2017 11:47 PM
To: Shraddha Hegde <shraddha@juniper.net>; draft-ietf-spring-c= onflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 

There is a misunderstanding on your p= art. It would be good if you read Section 3.3.8.  Guaranteeing Databas= e Consistency again.

 

In short, it does not matter whether = you do or do not advertise a prefix SID for a prefix which you own. What ma= tters is that all routers populate the mapping entry database consistent w Section 3.3.8 and that each router applies the= conflict resolution rules in a consistent manner. Then all routers will be= using the same prefix/SID pair in forwarding.

 

   Les

 

 

From: Shraddha Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addresses assign= ed to different nodes and one or more nodes

do not advertise a Prefix SID for that anycast addr= ess but other nodes advertise a prefix-sid, there is a possibility

of different implementations behaving differently w= ith respect to programming the labelled routes.

 

This scenario should be considered as a prefix conf= lict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with the relevant= text to describe the behavior.

 

 

Rgds

Shraddha

 

--_000_BN3PR05MB2706A0AB65F01D367E29C8C3D5EA0BN3PR05MB2706namp_-- From nobody Thu May 4 00:50:40 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A2DF3129AD4; Thu, 4 May 2017 00:50:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lbrVlGRA89FP; Thu, 4 May 2017 00:50:28 -0700 (PDT) Received: from relais-inet.orange.com (mta134.mail.business.static.orange.com [80.12.70.34]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A89DD1294A6; Thu, 4 May 2017 00:50:27 -0700 (PDT) Received: from opfednr02.francetelecom.fr (unknown [xx.xx.xx.66]) by opfednr27.francetelecom.fr (ESMTP service) with ESMTP id 18639A02CB; Thu, 4 May 2017 09:50:26 +0200 (CEST) Received: from Exchangemail-eme3.itn.ftgroup (unknown [xx.xx.50.55]) by opfednr02.francetelecom.fr (ESMTP service) with ESMTP id D414B120076; Thu, 4 May 2017 09:50:25 +0200 (CEST) Received: from OPEXCNORMAC.corporate.adroot.infra.ftgroup ([fe80::f9fb:6cba:1c64:7737]) by OPEXCNORM63.corporate.adroot.infra.ftgroup ([fe80::950f:e42a:174e:2048%21]) with mapi id 14.03.0339.000; Thu, 4 May 2017 09:50:25 +0200 From: To: "Stefano Previdi (sprevidi)" , Lou Berger CC: "rtg-ads@ietf.org" , "rtg-dir@ietf.org" , "draft-ietf-spring-resiliency-use-cases.all@ietf.org" , "spring@ietf.org" Thread-Topic: RtgDir review: draft-ietf-spring-resiliency-use-cases-08 Thread-Index: AQHSvStM4BHVWrHbK0qj4IblMxrb7aHaf4gAgAla8rA= Date: Thu, 4 May 2017 07:50:24 +0000 Message-ID: <25760_1493884225_590ADD41_25760_636_1_9E32478DFA9976438E7A22F69B08FF921DD753DA@OPEXCNORMAC.corporate.adroot.infra.ftgroup> References: <52f7d439-e0b3-e7c5-e0ab-c00569dad1a5@labn.net> <6F302925-DB12-451F-8738-40A2E891E404@cisco.com> In-Reply-To: <6F302925-DB12-451F-8738-40A2E891E404@cisco.com> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] RtgDir review: draft-ietf-spring-resiliency-use-cases-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Thu, 4 May 2017 08:59:06 -0400 From: "Stefano Previdi (sprevidi)" To: Stephane Litkowski , Lou Berger CC: "rtg-ads@ietf.org" , "rtg-dir@ietf.org" , "draft-ietf-spring-resiliency-use-cases.all@ietf.org" , "spring@ietf.org" Thread-Topic: RtgDir review: draft-ietf-spring-resiliency-use-cases-08 Thread-Index: AQHSvStPgbckbBbQm0KLwaNzhINY1KHa5BsAgAk6yQCAAFY9AA== Date: Thu, 4 May 2017 12:59:06 +0000 Message-ID: <645A0833-9D89-444E-9FC2-688A8332C5CD@cisco.com> References: <52f7d439-e0b3-e7c5-e0ab-c00569dad1a5@labn.net> <6F302925-DB12-451F-8738-40A2E891E404@cisco.com> <25760_1493884225_590ADD41_25760_636_1_9E32478DFA9976438E7A22F69B08FF921DD753DA@OPEXCNORMAC.corporate.adroot.infra.ftgroup> In-Reply-To: <25760_1493884225_590ADD41_25760_636_1_9E32478DFA9976438E7A22F69B08FF921DD753DA@OPEXCNORMAC.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.108.100] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] RtgDir review: draft-ietf-spring-resiliency-use-cases-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 May 2017 12:59:19 -0000 SGkgU3RlcGhhbmUsIExvdSwNCg0Kc29ycnksIEkgbWlzc2VkIHRoYXQgY29tbWVudCAoaW4gZmFj dCBJIGRpZCBnZXQgaXQgYnV0IGZvcmdvdCB0byBhZGRyZXNzIGl0KS4NCg0KSSB3aWxsIGFkZCB0 aGUgbmVjZXNzYXJ5IHRleHQgYW5kIHdpbGwgc3VibWl0IGEgbmV3IHZlcnNpb24gYXNhcC4NCg0K cy4NCg0KDQo+IE9uIE1heSA0LCAyMDE3LCBhdCA5OjUwIEFNLCBzdGVwaGFuZS5saXRrb3dza2lA b3JhbmdlLmNvbSB3cm90ZToNCj4gDQo+IEhpIFN0ZWZhbm8sDQo+IA0KPiBTcGVha2luZyBhcyBk b2MgU2hlcGhlcmQsIEkgZG8gbm90IHNlZSBpbiB0aGUgVjA5LCBob3cgeW91IGFyZSBhZGRyZXNz aW5nIExvdSdzIHBvaW50IGFib3V0IDE6MSBhbmQgMSsxIHByb3RlY3Rpb24gaW4gdGhlIFNlY3Rp b24gMi4NCj4gSSB0aGluayBpdCBtYWtlIHNlbnNlIHRvIGFkZCBhIHNpbXBsZSBleHBsaWNpdCBz dGF0ZW1lbnQgdGhhdCAgU1BSSU5HIHNob3VsZCBzdXBwb3J0IGJvdGggYXBwcm9hY2guIEl0IGlz IHBhcnRpYWxseSBhZGRyZXNzZWQgYnkgIiBUaGUgdHdvIHBhdGhzIG1heSBiZSB1c2VkIGNvbmN1 cnJlbnRseSBvciBhcyBhIHByaW1hcnkgYW5kIGJhY2t1cA0KPiAgIHBhdGggd2hlcmUgdGhlIHNl 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IG1lc3NhZ2UgYW5kIGl0cyBhdHRhY2htZW50cyBtYXkgY29udGFpbiBjb25maWRlbnRpYWwgb3Ig cHJpdmlsZWdlZCBpbmZvcm1hdGlvbiB0aGF0IG1heSBiZSBwcm90ZWN0ZWQgYnkgbGF3Ow0KPiB0 aGV5IHNob3VsZCBub3QgYmUgZGlzdHJpYnV0ZWQsIHVzZWQgb3IgY29waWVkIHdpdGhvdXQgYXV0 aG9yaXNhdGlvbi4NCj4gSWYgeW91IGhhdmUgcmVjZWl2ZWQgdGhpcyBlbWFpbCBpbiBlcnJvciwg cGxlYXNlIG5vdGlmeSB0aGUgc2VuZGVyIGFuZCBkZWxldGUgdGhpcyBtZXNzYWdlIGFuZCBpdHMg YXR0YWNobWVudHMuDQo+IEFzIGVtYWlscyBtYXkgYmUgYWx0ZXJlZCwgT3JhbmdlIGlzIG5vdCBs aWFibGUgZm9yIG1lc3NhZ2VzIHRoYXQgaGF2ZSBiZWVuIG1vZGlmaWVkLCBjaGFuZ2VkIG9yIGZh bHNpZmllZC4NCj4gVGhhbmsgeW91Lg0KPiANCg0K From nobody Thu May 4 11:35:29 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AD51C1293EC; Thu, 4 May 2017 11:35:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r1Kyf1u9pRUg; Thu, 4 May 2017 11:35:26 -0700 (PDT) Received: from alln-iport-7.cisco.com (alln-iport-7.cisco.com [173.37.142.94]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 56AAB128792; Thu, 4 May 2017 11:35:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=32687; q=dns/txt; s=iport; t=1493922926; x=1495132526; 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[173.37.102.13]) by rcdn-core-10.cisco.com (8.14.5/8.14.5) with ESMTP id v44IZMxG017219 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Thu, 4 May 2017 18:35:23 GMT Received: from xch-aln-001.cisco.com (173.36.7.11) by XCH-RCD-003.cisco.com (173.37.102.13) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Thu, 4 May 2017 13:35:22 -0500 Received: from xch-aln-001.cisco.com ([173.36.7.11]) by XCH-ALN-001.cisco.com ([173.36.7.11]) with mapi id 15.00.1210.000; Thu, 4 May 2017 13:35:22 -0500 From: "Les Ginsberg (ginsberg)" To: Shraddha Hegde , "draft-ietf-spring-conflict-resolution@ietf.org" CC: "spring@ietf.org" Thread-Topic: Mail regarding draft-ietf-spring-conflict-resolution Thread-Index: AdLEK6gAqg4DUgoVTleNTb+KJq8tswADTO5AABYn9bAAG8P6sA== Date: Thu, 4 May 2017 18:35:21 +0000 Message-ID: References: <97e3921eb1014725a484156d96191570@XCH-ALN-001.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.32.152.11] Content-Type: multipart/alternative; boundary="_000_f4aa2dd9ce2c4df18f29471c57844f5fXCHALN001ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 May 2017 18:35:29 -0000 --_000_f4aa2dd9ce2c4df18f29471c57844f5fXCHALN001ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Shraddha - First, there is no SID conflict here. There is therefore nothing for the co= nflict resolution draft to discuss. Let's look at your scenario more detail. To do so let's use the following s= imple topology: --------------A / G-----------------B \ ----------------C Using your example w addition of P/E flag settings in prefix-sid advertisem= ent (using IS-IS naming convention). For simplicity assume all nodes have the default SRGB (16000 - 23999). 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 P flag =3D 0 E flag = =3D 0 3. Prefix 1.1.1.1 advertised from node C with SID 10 P flag =3D 1 E flag = =3D 0 Using procedures defined in draft-ietf-spring-conflict-resolution all nodes= in the network will use SID 10 when forwarding traffic to 1.1.1.1. The que= stion is what should the penultimate next hop router do when forwarding a p= acket to each of the owning nodes? When G forwards the packet to B, PHP is indicated, so G will POP. When G forwards the packet to C, UHP is indicated and E flag is 0, so G wil= l send the packet with outgoing label 16010. When G forwards the packet to A, because A has not advertised the prefix-SI= D (but is SR capable) we do not know whether it wants PHP or not - so we ha= ve to make an assumption. Default MPLS behavior is to assume PHP. If A does not want PHP then it would have to advertise the prefix SID so it= could specify desired behavior using P/E flags. Note that this same situation can occur if the mapping server is used as a = global provisioning tool. In such a case no prefix-SIDs need be advertised = in prefix reachability advertisements - all SIDs are advertised by SRMS adv= ertisements which do not include P/E flags. Historically, MPLS implementations have chosen a default behavior (equival= ent to P and E flags =3D 0). Some implementations provide knobs to override= this behavior. If your concern is that there is not an explicit definition of default PHP/= Explicit NULL behavior, then I think this needs to be directed at the MPLS = WG. I do not claim to be an MPLS expert, but I have found these references: RFC 3036 Section 6 "- Section 2.16 of the MPLS architecture [RFC3031] requires that the initial label distribution protocol negotiation between peer LSRs enable each LSR to determine whether its peer is capable of popping the label stack. This version of LDP assumes that LSRs support label popping for all link types except ATM and Frame Relay. A future version may specify means to make this determination part of the session initiation negotiation." Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 10:16 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, >From what you describe in section 3.3.8, all the SIDs attached to prefixes = are fed into the database. The example I am talking about, 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 3. Prefix 1.1.1.1 advertised from node C with SID 10 The advertisements 2 and 3 are fed into the mapping database and 1 isn't. The conflict resolution does not detect any conflict with the above adverti= sements and For prefix 1.1.1.1 /SID 10 is chosen. All this is fine but the problem is in programming the forwarding plane. Lets say for a certain node E in the network node A is the nexthop for 1.1.= 1.1. How would node E program its forwarding plane? Node E should recognize the conflict between node A, Node B and C and progr= am the SID 10 with a pop and forward instead of looking into the P and E flags of = the SID 10? This is good enough detail, that should be explained in the draft instead o= f leaving it to the Imagination of implementers. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 3, 2017 11:47 PM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - There is a misunderstanding on your part. It would be good if you read Sect= ion 3.3.8. Guaranteeing Database Consistency again. In short, it does not matter whether you do or do not advertise a prefix SI= D for a prefix which you own. What matters is that all routers populate the= mapping entry database consistent w Section 3.3.8 and that each router app= lies the conflict resolution rules in a consistent manner. Then all routers= will be using the same prefix/SID pair in forwarding. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_f4aa2dd9ce2c4df18f29471c57844f5fXCHALN001ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Shraddha –

 <= /p>

First, there is no SID co= nflict here. There is therefore nothing for the conflict resolution draft t= o discuss.

 <= /p>

Let’s look at your = scenario more detail. To do so let’s use the following simple topolog= y:

 <= /p>

 <= /p>

    &= nbsp;  --------------A

  /<= /span>

G-----------------B<= /o:p>

  \

     = ----------------C

 <= /p>

Using your example w addi= tion of P/E flag settings in prefix-sid advertisement (using IS-IS naming c= onvention).

For simplicity assume all= nodes have the default SRGB (16000 – 23999).

 <= /p>

1.prefix 1.1.1.1 advertis= ed from node A with no SID

2.Prefix 1.1.1.1 advertis= ed from node B with SID 10  P flag =3D 0 E flag =3D 0

3. Prefix 1.1.1.1 adverti= sed from node C with SID 10 P flag =3D 1  E flag =3D 0

 <= /p>

Using procedures defined = in draft-ietf-spring-conflict-resolution all nodes in the network will use = SID 10 when forwarding traffic to 1.1.1.1. The question is what should the penultimate next hop router do when forwarding a packet= to each of the owning nodes?

 <= /p>

When G forwards the packe= t to B, PHP is indicated, so G will POP.

When G forwards the packe= t to C, UHP is indicated and E flag is 0, so G will send the packet with ou= tgoing label 16010.

 <= /p>

When G forwards the packe= t to A, because A has not advertised the prefix-SID (but is SR capable) we = do not know whether it wants PHP or not – so we have to make an assumption.

Default MPLS behavior is = to assume PHP.

If A does not want PHP th= en it would have to advertise the prefix SID so it could specify desired be= havior using P/E flags.

 <= /p>

Note that this same situa= tion can occur if the mapping server is used as a global provisioning tool.= In such a case no prefix-SIDs need be advertised in prefix reachability advertisements – all SIDs are advertised by SRMS advert= isements which do not include P/E flags.

 <= /p>

Historically,  MPLS = implementations have chosen a default behavior (equivalent to P and E flags= =3D 0). Some implementations provide knobs to override this behavior.=

 <= /p>

If your concern is that t= here is not an explicit definition of default PHP/Explicit NULL behavior, t= hen I think this needs to be directed at the MPLS WG. I do not claim to be an MPLS expert, but I have found these references:=

 <= /p>

RFC 3036 Section 6

 <= /p>

“-  Section 2.= 16 of the MPLS architecture [RFC3031] requires that

    &= nbsp;    the initial label distribution protocol negotiation= between

    &= nbsp;    peer LSRs enable each LSR to determine whether its = peer is

    &= nbsp;    capable of popping the label stack.  This vers= ion of LDP

    &= nbsp;    assumes that LSRs support label popping for all lin= k types

    &= nbsp;    except ATM and Frame Relay.  A future version = may specify means

    &= nbsp;    to make this determination part of the session init= iation

    &= nbsp;    negotiation.”

 <= /p>

   Les

 <= /p>

From: Shraddha= Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 10:16 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@i= etf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 <= /p>

From what you describe in= section 3.3.8, all the SIDs attached to prefixes are fed into the database= .

The example I am talking = about,

 <= /p>

1.prefix 1.1.1.1 advertis= ed from node A with no SID

2.Prefix 1.1.1.1 advertis= ed from node B with SID 10

3. Prefix 1.1.1.1 adverti= sed from node C with SID 10

 <= /p>

The advertisements 2 and = 3 are fed into the mapping database and 1 isn’t.

 <= /p>

The conflict resolution d= oes not detect any conflict with the above advertisements and

For prefix 1.1.1.1 /SID 1= 0 is chosen.

All this is fine but the = problem is in programming the forwarding plane.

 <= /p>

Lets say for a certain no= de E in the network node A is the nexthop for 1.1.1.1.

How would node E program = its forwarding plane?

 <= /p>

Node E should recognize t= he conflict between node A, Node B and C and program the<= /p>

SID 10 with a pop and for= ward instead of looking into the P and E flags of the SID 10?

 <= /p>

This is good enough detai= l, that should be explained in the draft instead of leaving it to the<= /o:p>

Imagination of implemente= rs.

 <= /p>

Rgds

Shraddha

 <= /p>

 <= /p>

 <= /p>

 <= /p>

From: Les Gi= nsberg (ginsberg) [mailto:ginsberg@ci= sco.com]
Sent: Wednesday, May 3, 2017 11:47 PM
To: Shraddha Hegde <shrad= dha@juniper.net>; draft-iet= f-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 <= /p>

There is a misunderstandi= ng on your part. It would be good if you read Section 3.3.8.  Guarante= eing Database Consistency again.

 <= /p>

In short, it does not mat= ter whether you do or do not advertise a prefix SID for a prefix which you = own. What matters is that all routers populate the mapping entry database consistent w Section 3.3.8 and that each router applies the= conflict resolution rules in a consistent manner. Then all routers will be= using the same prefix/SID pair in forwarding.

 <= /p>

   Les

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:shraddha@juniper.net= ]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addr= esses assigned to different nodes and one or more nodes

do not advertise a Prefix SID for that = anycast address but other nodes advertise a prefix-sid, there is a possibil= ity

of different implementations behaving d= ifferently with respect to programming the labelled routes.

 

This scenario should be considered as a= prefix conflict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with = the relevant text to describe the behavior.

 

 

Rgds

Shraddha

 

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H:BN3PR05MB2706.namprd05.prod.outlook.com; FPR:; SPF:None; MLV:sfv; LANG:en; spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_BN3PR05MB2706C76C9B839C51D623819CD5EB0BN3PR05MB2706namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 05 May 2017 05:01:57.0967 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN3PR05MB2705 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 May 2017 05:02:02 -0000 --_000_BN3PR05MB2706C76C9B839C51D623819CD5EB0BN3PR05MB2706namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Les, The issues we are discussing here are specific to Segment Routing and SPRIN= G is the right WG to address this. The problem here is not about standardizing what is the= default PHP behavior, it is about the scenarios when this default behavior assumpti= on need to be applied. The problem doesn't get solved by applying default PHP behavior in all case= s. Assume 1.1.1.1 in the example below is a redistributed prefix from another = ISIS Level. In that case the pop and forward will cause the service labels to get exposed at A= which would cause black-holing or misrouting. These are issues caused by config errors and IMO conflict resolution draft = is the right place to describe these cases and the solutions so that all vendors have consiste= nt behaviours. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Friday, May 5, 2017 12:05 AM To: Shraddha Hegde ; draft-ietf-spring-conflict-resol= ution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - First, there is no SID conflict here. There is therefore nothing for the co= nflict resolution draft to discuss. Let's look at your scenario more detail. To do so let's use the following s= imple topology: --------------A / G-----------------B \ ----------------C Using your example w addition of P/E flag settings in prefix-sid advertisem= ent (using IS-IS naming convention). For simplicity assume all nodes have the default SRGB (16000 - 23999). 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 P flag =3D 0 E flag = =3D 0 3. Prefix 1.1.1.1 advertised from node C with SID 10 P flag =3D 1 E flag = =3D 0 Using procedures defined in draft-ietf-spring-conflict-resolution all nodes= in the network will use SID 10 when forwarding traffic to 1.1.1.1. The que= stion is what should the penultimate next hop router do when forwarding a p= acket to each of the owning nodes? When G forwards the packet to B, PHP is indicated, so G will POP. When G forwards the packet to C, UHP is indicated and E flag is 0, so G wil= l send the packet with outgoing label 16010. When G forwards the packet to A, because A has not advertised the prefix-SI= D (but is SR capable) we do not know whether it wants PHP or not - so we ha= ve to make an assumption. Default MPLS behavior is to assume PHP. If A does not want PHP then it would have to advertise the prefix SID so it= could specify desired behavior using P/E flags. Note that this same situation can occur if the mapping server is used as a = global provisioning tool. In such a case no prefix-SIDs need be advertised = in prefix reachability advertisements - all SIDs are advertised by SRMS adv= ertisements which do not include P/E flags. Historically, MPLS implementations have chosen a default behavior (equival= ent to P and E flags =3D 0). Some implementations provide knobs to override= this behavior. If your concern is that there is not an explicit definition of default PHP/= Explicit NULL behavior, then I think this needs to be directed at the MPLS = WG. I do not claim to be an MPLS expert, but I have found these references: RFC 3036 Section 6 "- Section 2.16 of the MPLS architecture [RFC3031] requires that the initial label distribution protocol negotiation between peer LSRs enable each LSR to determine whether its peer is capable of popping the label stack. This version of LDP assumes that LSRs support label popping for all link types except ATM and Frame Relay. A future version may specify means to make this determination part of the session initiation negotiation." Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 10:16 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org= Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, >From what you describe in section 3.3.8, all the SIDs attached to prefixes = are fed into the database. The example I am talking about, 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 3. Prefix 1.1.1.1 advertised from node C with SID 10 The advertisements 2 and 3 are fed into the mapping database and 1 isn't. The conflict resolution does not detect any conflict with the above adverti= sements and For prefix 1.1.1.1 /SID 10 is chosen. All this is fine but the problem is in programming the forwarding plane. Lets say for a certain node E in the network node A is the nexthop for 1.1.= 1.1. How would node E program its forwarding plane? Node E should recognize the conflict between node A, Node B and C and progr= am the SID 10 with a pop and forward instead of looking into the P and E flags of = the SID 10? This is good enough detail, that should be explained in the draft instead o= f leaving it to the Imagination of implementers. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 3, 2017 11:47 PM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - There is a misunderstanding on your part. It would be good if you read Sect= ion 3.3.8. Guaranteeing Database Consistency again. In short, it does not matter whether you do or do not advertise a prefix SI= D for a prefix which you own. What matters is that all routers populate the= mapping entry database consistent w Section 3.3.8 and that each router app= lies the conflict resolution rules in a consistent manner. Then all routers= will be using the same prefix/SID pair in forwarding. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_BN3PR05MB2706C76C9B839C51D623819CD5EB0BN3PR05MB2706namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Les,

 

The issues we are discussing here are= specific to Segment Routing and SPRING is the right

WG to address this. The problem here = is not about standardizing what is the default

PHP behavior, it is about the scenari= os when this default behavior assumption need to be applied.

 

The problem doesn’t get solved = by applying default PHP behavior in all cases.

Assume 1.1.1.1 in the example below i= s a redistributed prefix from another ISIS Level. In that=

case  the pop and forward will c= ause the service labels to get exposed at A which

would cause black-holing or misroutin= g.

 

These are issues caused by config err= ors and IMO conflict resolution draft is the right place<= /p>

to describe these cases and the solut= ions so that all vendors have consistent behaviours.

 

 

Rgds

Shraddha

 

From: Les Ginsberg (ginsberg) [mailt= o:ginsberg@cisco.com]
Sent: Friday, May 5, 2017 12:05 AM
To: Shraddha Hegde <shraddha@juniper.net>; draft-ietf-spring-c= onflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 

First, there is no SID conflict here.= There is therefore nothing for the conflict resolution draft to discuss.

 

Let’s look at your scenario mor= e detail. To do so let’s use the following simple topology:

 

 

       = --------------A

  /

G-----------------B=

  \

     ------------= ----C

 

Using your example w addition of P/E = flag settings in prefix-sid advertisement (using IS-IS naming convention).<= o:p>

For simplicity assume all nodes have = the default SRGB (16000 – 23999).

 

1.prefix 1.1.1.1 advertised from node= A with no SID

2.Prefix 1.1.1.1 advertised from node= B with SID 10  P flag =3D 0 E flag =3D 0

3. Prefix 1.1.1.1 advertised from nod= e C with SID 10 P flag =3D 1  E flag =3D 0

 

Using procedures defined in draft-iet= f-spring-conflict-resolution all nodes in the network will use SID 10 when = forwarding traffic to 1.1.1.1. The question is what should the penultimate next hop router do when forwarding a packet to= each of the owning nodes?

 

When G forwards the packet to B, PHP = is indicated, so G will POP.

When G forwards the packet to C, UHP = is indicated and E flag is 0, so G will send the packet with outgoing label= 16010.

 

When G forwards the packet to A, beca= use A has not advertised the prefix-SID (but is SR capable) we do not know = whether it wants PHP or not – so we have to make an assumption.

Default MPLS behavior is to assume PH= P.

If A does not want PHP then it would = have to advertise the prefix SID so it could specify desired behavior using= P/E flags.

 

Note that this same situation can occ= ur if the mapping server is used as a global provisioning tool. In such a c= ase no prefix-SIDs need be advertised in prefix reachability advertisements – all SIDs are advertised by SRMS advert= isements which do not include P/E flags.

 

Historically,  MPLS implementati= ons have chosen a default behavior (equivalent to P and E flags =3D 0). Som= e implementations provide knobs to override this behavior.

 

If your concern is that there is not = an explicit definition of default PHP/Explicit NULL behavior, then I think = this needs to be directed at the MPLS WG. I do not claim to be an MPLS expert, but I have found these references:

 

RFC 3036 Section 6<= /p>

 

“-  Section 2.16 of the MP= LS architecture [RFC3031] requires that

      &= nbsp;  the initial label distribution protocol negotiation between

      &= nbsp;  peer LSRs enable each LSR to determine whether its peer is=

      &= nbsp;  capable of popping the label stack.  This version of LDP

      &= nbsp;  assumes that LSRs support label popping for all link types=

      &= nbsp;  except ATM and Frame Relay.  A future version may specify = means

      &= nbsp;  to make this determination part of the session initiation<= /o:p>

      &= nbsp;  negotiation.”

 

   Les

 

From: Shraddha Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 10:16 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@iet= f.org
Cc: spring@ietf.org=
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 

From what you describe in section 3.3= .8, all the SIDs attached to prefixes are fed into the database.=

The example I am talking about,

 

1.prefix 1.1.1.1 advertised from node= A with no SID

2.Prefix 1.1.1.1 advertised from node= B with SID 10

3. Prefix 1.1.1.1 advertised from nod= e C with SID 10

 

The advertisements 2 and 3 are fed in= to the mapping database and 1 isn’t.

 

The conflict resolution does not dete= ct any conflict with the above advertisements and

For prefix 1.1.1.1 /SID 10 is chosen.=

All this is fine but the problem is i= n programming the forwarding plane.

 

Lets say for a certain node E in the = network node A is the nexthop for 1.1.1.1.

How would node E program its forwardi= ng plane?

 

Node E should recognize the conflict = between node A, Node B and C and program the

SID 10 with a pop and forward instead= of looking into the P and E flags of the SID 10?

 

This is good enough detail, that shou= ld be explained in the draft instead of leaving it to the=

Imagination of implementers.

 

Rgds

Shraddha

 

 

 

 

 

Shraddha –

 

There is a misunderstanding on your p= art. It would be good if you read Section 3.3.8.  Guaranteeing Databas= e Consistency again.

 

In short, it does not matter whether = you do or do not advertise a prefix SID for a prefix which you own. What ma= tters is that all routers populate the mapping entry database consistent w Section 3.3.8 and that each router applies the= conflict resolution rules in a consistent manner. Then all routers will be= using the same prefix/SID pair in forwarding.

 

   Les

 

 

From: Shraddha Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org=
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addresses assign= ed to different nodes and one or more nodes

do not advertise a Prefix SID for that anycast addr= ess but other nodes advertise a prefix-sid, there is a possibility

of different implementations behaving differently w= ith respect to programming the labelled routes.

 

This scenario should be considered as a prefix conf= lict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with the relevant= text to describe the behavior.

 

 

Rgds

Shraddha

 

--_000_BN3PR05MB2706C76C9B839C51D623819CD5EB0BN3PR05MB2706namp_-- From nobody Fri May 5 00:22:56 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 417F912945A; Fri, 5 May 2017 00:22:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id K6PrtMyTtqzA; Fri, 5 May 2017 00:22:50 -0700 (PDT) Received: from rcdn-iport-9.cisco.com (rcdn-iport-9.cisco.com [173.37.86.80]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7E00C129458; Fri, 5 May 2017 00:22:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=52923; q=dns/txt; s=iport; t=1493968970; x=1495178570; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=hv8CAOkro57qQP8ebEyKXd3zf9A7+YgU6iSX7LkZM6I=; b=DMyCPRV6ustxyc7TjfG+LWlJlVzHsYCKuBb/kjNzBoPbZ4A+xe78qRkc RyqYbC5eloH2L4Td/VGpcPjy6DC+5HyCrGuRDrrKuPMIzuOEsYg85rsNX 5WvnYV+EmwA2R03naShNZCVoVTte9lTNldG0shXOP3oDcG7RPcHWiASCy 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DNAACEJwxZ/49dJa1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm48K2KBDAeNeZFXlXCCD4YkAoRGPxgBAgEBAQEBAQFrKIUVAQE?= =?us-ascii?q?BAQMMIT4OEAIBCBEBAwEBIQEGBzIUAwYIAQEEAQ0FCBOKBbQgimcBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEdhl+BXQGDG4RGAQEFPBCFLwWJQo0bhwoBkwyCDYU5g2a?= =?us-ascii?q?GRYh6izwBHzhZMW8VhTkcgWN2hkeBIYENAQEB?= X-IronPort-AV: E=Sophos;i="5.38,291,1491264000"; d="scan'208,217";a="239375434" Received: from rcdn-core-7.cisco.com ([173.37.93.143]) by rcdn-iport-9.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 May 2017 07:22:48 +0000 Received: from XCH-RCD-003.cisco.com (xch-rcd-003.cisco.com [173.37.102.13]) by rcdn-core-7.cisco.com (8.14.5/8.14.5) with ESMTP id v457Mmk0025671 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 5 May 2017 07:22:48 GMT Received: from xch-aln-001.cisco.com (173.36.7.11) by XCH-RCD-003.cisco.com (173.37.102.13) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 5 May 2017 02:22:47 -0500 Received: from xch-aln-001.cisco.com ([173.36.7.11]) by XCH-ALN-001.cisco.com ([173.36.7.11]) with mapi id 15.00.1210.000; Fri, 5 May 2017 02:22:47 -0500 From: "Les Ginsberg (ginsberg)" To: Shraddha Hegde , "draft-ietf-spring-conflict-resolution@ietf.org" CC: "spring@ietf.org" Thread-Topic: Mail regarding draft-ietf-spring-conflict-resolution Thread-Index: AdLEK6gAqg4DUgoVTleNTb+KJq8tswADTO5AABYn9bAAG8P6sAAWfQLAAAUbuzA= Date: Fri, 5 May 2017 07:22:47 +0000 Message-ID: <0c0d0e56b13f47d2918c6cba51562a89@XCH-ALN-001.cisco.com> References: <97e3921eb1014725a484156d96191570@XCH-ALN-001.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.123.143] Content-Type: multipart/alternative; boundary="_000_0c0d0e56b13f47d2918c6cba51562a89XCHALN001ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 May 2017 07:22:53 -0000 --_000_0c0d0e56b13f47d2918c6cba51562a89XCHALN001ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Shraddha - I say again - there is no conflict and there is no config error. Let's use another example which does NOT involve anycast. --------------A (1.1.1.1) / G-----------------B (1.1.1.2) \ ----------------C(1.1.1.3) NO SIDS are locally configured on any routers because the operator has chos= en to use SRMS as a global provisioning tool. Therefore none of the prefix reachability advertisements include a SID. SRMS (say advertised by some node "F" ) advertises the following: 1.1.1.1/32 100 range 3 SRMS advertisements do not support P/E flags. When G forwards the following packets it has to make a decision as to wheth= er to do PHP, UHP, EXPLICIT_NULL: 1.1.1.1 to A 1.1.1.2 to B 1.1.1.3 to C But there is no advertisement of P/E for any of the destinations. It must f= ollow a default behavior. If you think there is a problem here, please clearly state what it is and w= hat you think should be done about it. But whatever you think it might be, this has nothing to do with SID conflic= t resolution - which is defining a way to resolve advertised Prefix Conflic= ts/SID Conflicts as defined in Section 3.2 of the draft. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Thursday, May 04, 2017 10:02 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, The issues we are discussing here are specific to Segment Routing and SPRIN= G is the right WG to address this. The problem here is not about standardizing what is the= default PHP behavior, it is about the scenarios when this default behavior assumpti= on need to be applied. The problem doesn't get solved by applying default PHP behavior in all case= s. Assume 1.1.1.1 in the example below is a redistributed prefix from another = ISIS Level. In that case the pop and forward will cause the service labels to get exposed at A= which would cause black-holing or misrouting. These are issues caused by config errors and IMO conflict resolution draft = is the right place to describe these cases and the solutions so that all vendors have consiste= nt behaviours. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Friday, May 5, 2017 12:05 AM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - First, there is no SID conflict here. There is therefore nothing for the co= nflict resolution draft to discuss. Let's look at your scenario more detail. To do so let's use the following s= imple topology: --------------A / G-----------------B \ ----------------C Using your example w addition of P/E flag settings in prefix-sid advertisem= ent (using IS-IS naming convention). For simplicity assume all nodes have the default SRGB (16000 - 23999). 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 P flag =3D 0 E flag = =3D 0 3. Prefix 1.1.1.1 advertised from node C with SID 10 P flag =3D 1 E flag = =3D 0 Using procedures defined in draft-ietf-spring-conflict-resolution all nodes= in the network will use SID 10 when forwarding traffic to 1.1.1.1. The que= stion is what should the penultimate next hop router do when forwarding a p= acket to each of the owning nodes? When G forwards the packet to B, PHP is indicated, so G will POP. When G forwards the packet to C, UHP is indicated and E flag is 0, so G wil= l send the packet with outgoing label 16010. When G forwards the packet to A, because A has not advertised the prefix-SI= D (but is SR capable) we do not know whether it wants PHP or not - so we ha= ve to make an assumption. Default MPLS behavior is to assume PHP. If A does not want PHP then it would have to advertise the prefix SID so it= could specify desired behavior using P/E flags. Note that this same situation can occur if the mapping server is used as a = global provisioning tool. In such a case no prefix-SIDs need be advertised = in prefix reachability advertisements - all SIDs are advertised by SRMS adv= ertisements which do not include P/E flags. Historically, MPLS implementations have chosen a default behavior (equival= ent to P and E flags =3D 0). Some implementations provide knobs to override= this behavior. If your concern is that there is not an explicit definition of default PHP/= Explicit NULL behavior, then I think this needs to be directed at the MPLS = WG. I do not claim to be an MPLS expert, but I have found these references: RFC 3036 Section 6 "- Section 2.16 of the MPLS architecture [RFC3031] requires that the initial label distribution protocol negotiation between peer LSRs enable each LSR to determine whether its peer is capable of popping the label stack. This version of LDP assumes that LSRs support label popping for all link types except ATM and Frame Relay. A future version may specify means to make this determination part of the session initiation negotiation." Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 10:16 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org= Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, >From what you describe in section 3.3.8, all the SIDs attached to prefixes = are fed into the database. The example I am talking about, 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 3. Prefix 1.1.1.1 advertised from node C with SID 10 The advertisements 2 and 3 are fed into the mapping database and 1 isn't. The conflict resolution does not detect any conflict with the above adverti= sements and For prefix 1.1.1.1 /SID 10 is chosen. All this is fine but the problem is in programming the forwarding plane. Lets say for a certain node E in the network node A is the nexthop for 1.1.= 1.1. How would node E program its forwarding plane? Node E should recognize the conflict between node A, Node B and C and progr= am the SID 10 with a pop and forward instead of looking into the P and E flags of = the SID 10? This is good enough detail, that should be explained in the draft instead o= f leaving it to the Imagination of implementers. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 3, 2017 11:47 PM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - There is a misunderstanding on your part. It would be good if you read Sect= ion 3.3.8. Guaranteeing Database Consistency again. In short, it does not matter whether you do or do not advertise a prefix SI= D for a prefix which you own. What matters is that all routers populate the= mapping entry database consistent w Section 3.3.8 and that each router app= lies the conflict resolution rules in a consistent manner. Then all routers= will be using the same prefix/SID pair in forwarding. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_0c0d0e56b13f47d2918c6cba51562a89XCHALN001ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Shraddha –

 <= /p>

I say again – there= is no conflict and there is no config error.

 <= /p>

Let’s use another e= xample which does NOT involve anycast.

 <= /p>

    &= nbsp;  --------------A (1.1.1.1)

  /

G-----------------B (1.1.= 1.2)

  \

     = ----------------C(1.1.1.3)

 <= /p>

NO SIDS are locally confi= gured on any routers because the operator has chosen to use SRMS as a globa= l provisioning tool.

Therefore none of the pre= fix reachability advertisements include a SID.

 <= /p>

SRMS (say advertised by s= ome node “F” ) advertises the following:

 <= /p>

1.1.1.1/32 100 range 3

SRMS advertisements do no= t support P/E flags.

 <= /p>

When G forwards the follo= wing packets it has to make a decision as to whether to do PHP, UHP, EXPLIC= IT_NULL:

 <= /p>

1.1.1.1&= nbsp;   to A

1.1.1.2&= nbsp;   to B

1.1.1.3&= nbsp;   to C

 <= /p>

But there is no advertise= ment of P/E for any of the destinations. It must follow a default behavior.=

 <= /p>

If you think there is a p= roblem here, please clearly state what it is and what you think should be d= one about it.

 <= /p>

But whatever you think it= might be, this has nothing to do with SID conflict resolution – whic= h is defining a way to resolve advertised Prefix Conflicts/SID Conflicts as defined in Section 3.2 of the draft.

 <= /p>

   Les

 <= /p>

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:shraddha@juniper.net]
Sent: Thursday, May 04, 2017 10:02 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@i= etf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 <= /p>

The issues we are discuss= ing here are specific to Segment Routing and SPRING is the right=

WG to address this. The p= roblem here is not about standardizing what is the default

PHP behavior, it is about= the scenarios when this default behavior assumption need to be applied.

 <= /p>

The problem doesn’t= get solved by applying default PHP behavior in all cases.

Assume 1.1.1.1 in the exa= mple below is a redistributed prefix from another ISIS Level. In that<= /o:p>

case  the pop and fo= rward will cause the service labels to get exposed at A which

would cause black-holing = or misrouting.

 <= /p>

These are issues caused b= y config errors and IMO conflict resolution draft is the right place

to describe these cases a= nd the solutions so that all vendors have consistent behaviours.=

 <= /p>

 <= /p>

Rgds

Shraddha

 <= /p>

From: Les Gi= nsberg (ginsberg) [mailto:ginsberg@ci= sco.com]
Sent: Friday, May 5, 2017 12:05 AM
To: Shraddha Hegde <shrad= dha@juniper.net>; draft-iet= f-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 <= /p>

First, there is no SID co= nflict here. There is therefore nothing for the conflict resolution draft t= o discuss.

 <= /p>

Let’s look at your = scenario more detail. To do so let’s use the following simple topolog= y:

 <= /p>

 <= /p>

    &= nbsp;  --------------A

  /<= /span>

G-----------------B<= /o:p>

  \

     = ----------------C

 <= /p>

Using your example w addi= tion of P/E flag settings in prefix-sid advertisement (using IS-IS naming c= onvention).

For simplicity assume all= nodes have the default SRGB (16000 – 23999).

 <= /p>

1.prefix 1.1.1.1 advertis= ed from node A with no SID

2.Prefix 1.1.1.1 advertis= ed from node B with SID 10  P flag =3D 0 E flag =3D 0

3. Prefix 1.1.1.1 adverti= sed from node C with SID 10 P flag =3D 1  E flag =3D 0

 <= /p>

Using procedures defined = in draft-ietf-spring-conflict-resolution all nodes in the network will use = SID 10 when forwarding traffic to 1.1.1.1. The question is what should the penultimate next hop router do when forwarding a packet= to each of the owning nodes?

 <= /p>

When G forwards the packe= t to B, PHP is indicated, so G will POP.

When G forwards the packe= t to C, UHP is indicated and E flag is 0, so G will send the packet with ou= tgoing label 16010.

 <= /p>

When G forwards the packe= t to A, because A has not advertised the prefix-SID (but is SR capable) we = do not know whether it wants PHP or not – so we have to make an assumption.

Default MPLS behavior is = to assume PHP.

If A does not want PHP th= en it would have to advertise the prefix SID so it could specify desired be= havior using P/E flags.

 <= /p>

Note that this same situa= tion can occur if the mapping server is used as a global provisioning tool.= In such a case no prefix-SIDs need be advertised in prefix reachability advertisements – all SIDs are advertised by SRMS advert= isements which do not include P/E flags.

 <= /p>

Historically,  MPLS = implementations have chosen a default behavior (equivalent to P and E flags= =3D 0). Some implementations provide knobs to override this behavior.=

 <= /p>

If your concern is that t= here is not an explicit definition of default PHP/Explicit NULL behavior, t= hen I think this needs to be directed at the MPLS WG. I do not claim to be an MPLS expert, but I have found these references:=

 <= /p>

RFC 3036 Section 6

 <= /p>

“-  Section 2.= 16 of the MPLS architecture [RFC3031] requires that

    &= nbsp;    the initial label distribution protocol negotiation= between

    &= nbsp;    peer LSRs enable each LSR to determine whether its = peer is

    &= nbsp;    capable of popping the label stack.  This vers= ion of LDP

    &= nbsp;    assumes that LSRs support label popping for all lin= k types

    &= nbsp;    except ATM and Frame Relay.  A future version = may specify means

    &= nbsp;    to make this determination part of the session init= iation

    &= nbsp;    negotiation.”

 <= /p>

   Les

 <= /p>

From: Shraddha= Hegde [mailto:s= hraddha@juniper.net]
Sent: Wednesday, May 03, 2017 10:16 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-re= solution@ietf.org
Cc: spring@iet= f.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 <= /p>

From what you describe in= section 3.3.8, all the SIDs attached to prefixes are fed into the database= .

The example I am talking = about,

 <= /p>

1.prefix 1.1.1.1 advertis= ed from node A with no SID

2.Prefix 1.1.1.1 advertis= ed from node B with SID 10

3. Prefix 1.1.1.1 adverti= sed from node C with SID 10

 <= /p>

The advertisements 2 and = 3 are fed into the mapping database and 1 isn’t.

 <= /p>

The conflict resolution d= oes not detect any conflict with the above advertisements and

For prefix 1.1.1.1 /SID 1= 0 is chosen.

All this is fine but the = problem is in programming the forwarding plane.

 <= /p>

Lets say for a certain no= de E in the network node A is the nexthop for 1.1.1.1.

How would node E program = its forwarding plane?

 <= /p>

Node E should recognize t= he conflict between node A, Node B and C and program the<= /p>

SID 10 with a pop and for= ward instead of looking into the P and E flags of the SID 10?

 <= /p>

This is good enough detai= l, that should be explained in the draft instead of leaving it to the<= /o:p>

Imagination of implemente= rs.

 <= /p>

Rgds

Shraddha

 <= /p>

 <= /p>

 <= /p>

 <= /p>

From: Les Gi= nsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 3, 2017 11:47 PM
To: Shraddha Hegde <shraddha@juniper.net>; draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ie= tf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 <= /p>

There is a misunderstandi= ng on your part. It would be good if you read Section 3.3.8.  Guarante= eing Database Consistency again.

 <= /p>

In short, it does not mat= ter whether you do or do not advertise a prefix SID for a prefix which you = own. What matters is that all routers populate the mapping entry database consistent w Section 3.3.8 and that each router applies the= conflict resolution rules in a consistent manner. Then all routers will be= using the same prefix/SID pair in forwarding.

 <= /p>

   Les

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:s= hraddha@juniper.net]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org<= /a>
Cc: spring@iet= f.org
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addr= esses assigned to different nodes and one or more nodes

do not advertise a Prefix SID for that = anycast address but other nodes advertise a prefix-sid, there is a possibil= ity

of different implementations behaving d= ifferently with respect to programming the labelled routes.

 

This scenario should be considered as a= prefix conflict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with = the relevant text to describe the behavior.

 

 

Rgds

Shraddha

 

--_000_0c0d0e56b13f47d2918c6cba51562a89XCHALN001ciscocom_-- From nobody Fri May 5 02:52:26 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B9379127444; Fri, 5 May 2017 02:52:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.101 X-Spam-Level: X-Spam-Status: No, score=-0.101 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 67bj1w3HyFaQ; Fri, 5 May 2017 02:52:17 -0700 (PDT) Received: from mail-wr0-x229.google.com (mail-wr0-x229.google.com [IPv6:2a00:1450:400c:c0c::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 713E2129494; Fri, 5 May 2017 02:52:14 -0700 (PDT) Received: by mail-wr0-x229.google.com with SMTP id z52so741043wrc.2; Fri, 05 May 2017 02:52:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=dAVff+ELhE+R+mrhkGqWGeDb0Pokp/P4b7/LNu1q6UU=; b=ovKfyDLS6QgKlIdeHcUOqDkYns3Jv4sI7O99SdCadR7wI3uiblWtxl8iJeTQg+xBgv rlr58ezXMH6naqOp6MRBWVgMMOY3LzUSalg7b9lNb8KCvbkJlkE8u3VKbcZGiUUAi1UX SpXN1qGsD68WXSXQvsxWcgUKb59BB46bQ3bh2RfOzNwotHN2QMnSW549riW37TW/EMtw lKB4BJGNTd3EFjxyjM7DmVobtpWM4ypgb011cbkLNjP62ezMK+INwSrU3DpLwx2Qpfx4 itcreic28s7crwXeL3cfHwGCIFySQ6jrRngY/kURrAs4uhXWj4wk3c2D2gvqead44ZwX YPgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=dAVff+ELhE+R+mrhkGqWGeDb0Pokp/P4b7/LNu1q6UU=; b=bYBu/wzmkhwfQXU7f0/bmssq8YcqeqF9jkymcV07gBrN2yb7VF9IO2j6VWWrKwtEie 9NurNNFM5gn5BeGhF/ygSIGxGpI+5quvom9lFx5FHqPth87a9VvQNBQlFDMSAvBcvT5e KtpoADhRuuh4vYV7+YBYEZRRp0HARSiG0/burXgR3BOhUB6ENa9S909lpFpbt+dwaSa1 KXxFF2t+rNdNY+naFoAumHgViEILGbLw6xIQYO+b9VPAw3xZqEklowqb/4Sl+H7dZJRK W/XpYU2lsQwYByoQnnk+DMf+pwM0V7wFTV0+S3UZz4WeJJuvVclAKn9YWpm4T3VZ1fnd FPIA== X-Gm-Message-State: AN3rC/7Du2H1Qmqe/Wi9iljeWOrpPhZ2he/E3cdxc4MUFNua3ydncfM/ dI+lFS6siWvzsA== X-Received: by 10.223.142.135 with SMTP id q7mr30804325wrb.180.1493977933007; Fri, 05 May 2017 02:52:13 -0700 (PDT) Received: from [10.66.12.31] ([131.227.23.37]) by smtp.gmail.com with ESMTPSA id f2sm1570032wmh.27.2017.05.05.02.52.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 05 May 2017 02:52:12 -0700 (PDT) To: "Alvaro Retana (aretana)" , "gen-art@ietf.org" References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> Cc: "spring@ietf.org" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "ietf@ietf.org" From: Stewart Bryant Message-ID: <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> Date: Fri, 5 May 2017 10:52:16 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 May 2017 09:52:19 -0000 On 04/05/2017 21:20, Alvaro Retana (aretana) wrote: > On 5/2/17, 12:57 PM, "Stewart Bryant" wrote: > > Stewart: > > Hi! How are you? > > Thanks for the detailed review! > >> A significant part of the justification seems to evolve around the >> inability of MPLS to function in an IPv6 only network. > It seems to me that this statement summarizes many of the concerns you listed as Major in the review. I can see why it seems like the justification is: “because MPLS doesn’t work, then we have to do IPv6.” – but I think that even if a complete solution exists (for an MPLS deployment on an IPv6-only network), some operators would still make the design choice of preferring an IPv6-only deployment. > > I think that it would be good for the authors to refocus the justification away from “because X doesn’t work”. Would that address this part of your concerns? > > Thanks! > > Alvaro. > Hi Alvaro, That would be a step in the right direction particularly if Carlos' OPS comments were also addressed. Without going back over the detail, I seem to remember I had a question as to how the homenet case worked given that SR needs topology info, and homenet has chosen a DV protocol. I also had a concerns about the validity of the scaling justification, and I think there are issues of trust that need to be discussed. Both of those may be addressable simply by providing more detail as Carlos suggests. Alternatively maybe it would be better to have a single use case: Operators that wish to deploy SR without an MPLS control plane, although as I note, you don't need an MPLS control plane to make MPLS SR work. - Stewart From nobody Fri May 5 03:10:45 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5241F1294D3; Fri, 5 May 2017 03:10:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.523 X-Spam-Level: X-Spam-Status: No, score=-14.523 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RfgpFvhUJ_1y; Fri, 5 May 2017 03:10:41 -0700 (PDT) Received: from alln-iport-7.cisco.com (alln-iport-7.cisco.com [173.37.142.94]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9F7D4129494; Fri, 5 May 2017 03:10:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=490; q=dns/txt; s=iport; t=1493979041; x=1495188641; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=6fgWWXgrLGODipEaRFnPqE7Lv9VKfrai0wFqmrHJlIY=; b=LYjymKMQlCHAZrR/NdAATWrUonv+qwNmF8EueKr214dFyNyyyK92LX8z xWk70toT5w1gtwHeP0yfTfd+1eAKTrg7E7ZU0JUwLFmBwQZlAppIE14O7 zLUubYRDqvz3V5EhpvJdgoZepu8CSE/bTPhVICD8GXu5Cbh3Z9huARCjv Q=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0BBAQAvTgxZ/5NdJa1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1WBbgeDYYoYkVeIIo1Ogg+GJAIahCw/GAECAQEBAQEBAWsohRU?= =?us-ascii?q?BAQEBAgEjEUUFCwIBCBgCAiYCAgIfERUQAgQBDQWKCAMNCLERgiaHKg2DLgEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEBAQEBAR2BC4VUgV4rgnCCVIUVLoIxAQSdNDsBjkSEUoF?= =?us-ascii?q?sAY97iyOJEwEfOIEKbxVYAYZfdodogQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.38,292,1491264000"; d="scan'208";a="422199871" Received: from rcdn-core-11.cisco.com ([173.37.93.147]) by alln-iport-7.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 May 2017 10:10:40 +0000 Received: from XCH-RTP-005.cisco.com (xch-rtp-005.cisco.com [64.101.220.145]) by rcdn-core-11.cisco.com (8.14.5/8.14.5) with ESMTP id v45AAe3I024908 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 5 May 2017 10:10:40 GMT Received: from xch-rtp-010.cisco.com (64.101.220.150) by XCH-RTP-005.cisco.com (64.101.220.145) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 5 May 2017 06:10:39 -0400 Received: from xch-rtp-010.cisco.com ([64.101.220.150]) by XCH-RTP-010.cisco.com ([64.101.220.150]) with mapi id 15.00.1210.000; Fri, 5 May 2017 06:10:39 -0400 From: "Stefano Previdi (sprevidi)" To: Stewart Bryant , "Alvaro Retana (aretana)" CC: "gen-art@ietf.org" , "spring@ietf.org" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "ietf@ietf.org" Thread-Topic: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 Thread-Index: AQHSxRPsenC9nUhN5Uqlm4iwP4zQyaHlw3QAgAAFHwA= Date: Fri, 5 May 2017 10:10:39 +0000 Message-ID: References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> In-Reply-To: <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.108.100] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 May 2017 10:10:44 -0000 DQo+IE9uIE1heSA1LCAyMDE3LCBhdCAxMTo1MiBBTSwgU3Rld2FydCBCcnlhbnQgPHN0ZXdhcnQu YnJ5YW50QGdtYWlsLmNvbT4gd3JvdGU6DQo+IA0KPiBBbHRlcm5hdGl2ZWx5IG1heWJlIGl0IHdv dWxkIGJlIGJldHRlciB0byBoYXZlIGEgc2luZ2xlIHVzZSBjYXNlOiBPcGVyYXRvcnMgdGhhdCB3 aXNoIHRvIGRlcGxveSBTUiB3aXRob3V0IGFuIE1QTFMgY29udHJvbCBwbGFuZSwNCg0KDQpJ4oCZ ZCBhZ3JlZSB3aXRoIHRoZSBhYm92ZS4gTGV04oCZcyBzaW1wbGlmeSB0aGUgZG9jdW1lbnQgd2l0 aCwgYXQgdGhlIGVuZCwgd2hhdCBpcyB0aGUgc2ltcGxlc3QgYW5kIG1vc3QgZXZpZGVudCB1c2Ug Y2FzZS4NCg0Kcy4NCg0K From nobody Fri May 5 03:17:32 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0697412957C; Fri, 5 May 2017 03:17:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.399 X-Spam-Level: X-Spam-Status: No, score=-2.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.199, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fGcHv4iikGDD; Fri, 5 May 2017 03:17:15 -0700 (PDT) Received: from mail-io0-x232.google.com (mail-io0-x232.google.com [IPv6:2607:f8b0:4001:c06::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1FD3A129494; Fri, 5 May 2017 03:17:15 -0700 (PDT) Received: by mail-io0-x232.google.com with SMTP id k91so2277201ioi.1; Fri, 05 May 2017 03:17:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=yEGkMWhVniH89nHOiu7Tkhj1wwabo+LZ5ZvEd+xmQGc=; b=EJv5h3vekD8I6pNuI6CAaEEiDJTeBrSPWgJWaYjr2uqDsENes8MdrNSCIPjB8CMCZl SQzQqwJEMGI/LG2bZAmAEB4YWWDJ/jWeIGtVFFJLPHq/vG8O1K1Wi37BpehkGol9a/YJ msOGxkaaAjlEpGyqlzwi3qFk7VayhiEd9eg3R7ocejgjl+5m8aaWB0WO4iPTzNVQ880J fyi7/LTYkZfkRrbbcqTS8v0PnTvk8Uoveyiyh8Qt35Cej9qT/01eWn7Kt2Gkg4/OoLZg cdx6GT8dRHJcwufHpmJ9d5XD5Vtn0pqUGdxj8vKc1LkWTzppOqSpftqIehP2x7cn3nlt r1MA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=yEGkMWhVniH89nHOiu7Tkhj1wwabo+LZ5ZvEd+xmQGc=; b=HUH+de8Mvx03MEL0LdKEtY0w55YBGGwb2DGvDjt79HggovqZ8FA+fEEVsiOTQe7Xmm 1w1h8iYl1iqIkAwSJtnu+2z/FJq7qnB4qzPfGNppMvuXd1lpbkSYy01dlPiWI04bnUHe alsgzXzC42gqFtu9k2bqFnXK3CpDL8Z1oewzrDuJCmiMlrWHS9ENIo6psYuATHQ8OnWy 7IThRyQJMoqynF0dATpZqOboYJu66ixB7FB+6UzqNV2sDtnQ6nACM0Aksnq6fMuajRsy ARbzy8OZe/HfvCRtXb33D7JX97wEh9Vb/hUt2QX6QkhfOfxZ9XJLBztM7+T7lHnwIaD+ tIDw== X-Gm-Message-State: AN3rC/5GY2K6U02xTBlCLfl1rh3Ugirj8/STbqTTuc1SFPKkBEMVWXg8 3Ddw4V+psHvDi5V/dJtvcDL5t1AE7A== X-Received: by 10.107.189.198 with SMTP id n189mr44287128iof.179.1493979434568; Fri, 05 May 2017 03:17:14 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.79.62.24 with HTTP; Fri, 5 May 2017 03:17:13 -0700 (PDT) Received: by 10.79.62.24 with HTTP; Fri, 5 May 2017 03:17:13 -0700 (PDT) In-Reply-To: References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> From: Robert Raszuk Date: Fri, 5 May 2017 06:17:13 -0400 X-Google-Sender-Auth: MRtjQW9V0HAM4B60QUfH-ukWZU0 Message-ID: To: stefano previdi Cc: IETF Discussion , Stewart Bryant , "Alvaro Retana (aretana)" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "gen-art@ietf.org" , "spring@ietf.org" Content-Type: multipart/alternative; boundary=94eb2c0c85e47fd130054ec431f1 Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 May 2017 10:17:17 -0000 --94eb2c0c85e47fd130054ec431f1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable And to add one observation .. Stewart makes a point that SR-MPLS can be deployed without mpls control plane. Well it sure does not require LDP however IGP or BGP extensions for SR-MPLS signalling is also an example of mpls control plane ... even if much simpler than traditional cases it is still required. Cheers, R. On May 5, 2017 12:10 PM, "Stefano Previdi (sprevidi)" wrote: > > > On May 5, 2017, at 11:52 AM, Stewart Bryant > wrote: > > > > Alternatively maybe it would be better to have a single use case: > Operators that wish to deploy SR without an MPLS control plane, > > > I=E2=80=99d agree with the above. Let=E2=80=99s simplify the document wit= h, at the end, > what is the simplest and most evident use case. > > s. > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > --94eb2c0c85e47fd130054ec431f1 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
And to add one observation ..=C2=A0

=
Stewart makes a point that SR-MPLS can be deployed = without mpls control plane.

We= ll it sure does not require LDP however IGP or BGP extensions for SR-MPLS s= ignalling is also an example of mpls control plane ... even if much simpler= than traditional cases it is still required.

Cheers,
R.

On May 5, 2017 12:1= 0 PM, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com> wrote:

> On May 5, 2017, at 11:52 AM, Stewart Bryant <stewart.bryant@gmail.com> wrote:
>
> Alternatively maybe it would be better to have a single use case: Oper= ators that wish to deploy SR without an MPLS control plane,


I=E2=80=99d agree with the above. Let=E2=80=99s simplify the document with,= at the end, what is the simplest and most evident use case.

s.

_______________________________________________
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--94eb2c0c85e47fd130054ec431f1-- From nobody Fri May 5 04:57:07 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E5CA7127275; Fri, 5 May 2017 04:57:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -13.123 X-Spam-Level: X-Spam-Status: No, score=-13.123 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zUXbdf7RTbLa; Fri, 5 May 2017 04:57:04 -0700 (PDT) Received: from alln-iport-5.cisco.com (alln-iport-5.cisco.com [173.37.142.92]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E9990127867; Fri, 5 May 2017 04:57:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2740; q=dns/txt; s=iport; t=1493985424; x=1495195024; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=Z6TFohnic1feC+UV8UtcDpcYJ0ObdcZjdnJOPslOllI=; b=TdpWMFajG67Km4qo9J0+B2QU1TBa1fByWGIV7iEfkc7P8v0BmtowCGmh da/KvszPlYy96AU3HqiTzFABqgqibWQtsnAM0osH8rr190AyKoBTRdioc WNfp1joyNlYahCJfUIDIvQKMXQXBNnGpi6cmMJc8N1nQj1x08zV7scCAv o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0BBAQA5ZwxZ/4sNJK1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1WBbgeDYYoYkVeIIo1Ogg+GJAIahC0/GAECAQEBAQEBAWsohRU?= =?us-ascii?q?BAQEBAgEjEUUFCwIBBgIYAgImAgICHxEVEAIEDgUbiW0DDQiTY51hgiaHKg2DL?= =?us-ascii?q?gEBAQEBAQEBAQEBAQEBAQEBAQEBAR2BC4cyK4JwglSCDxeCby6CMQEEnTQ7AY5?= =?us-ascii?q?EhFKRaIsjiRMBHziBCm8VWAGGX3aHaIENAQEB?= X-IronPort-AV: E=Sophos;i="5.38,292,1491264000"; d="scan'208";a="420429941" Received: from alln-core-6.cisco.com ([173.36.13.139]) by alln-iport-5.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 05 May 2017 11:57:02 +0000 Received: from XCH-ALN-001.cisco.com (xch-aln-001.cisco.com [173.36.7.11]) by alln-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id v45Bv2x9001207 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 5 May 2017 11:57:02 GMT Received: from xch-aln-001.cisco.com (173.36.7.11) by XCH-ALN-001.cisco.com (173.36.7.11) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 5 May 2017 06:57:01 -0500 Received: from xch-aln-001.cisco.com ([173.36.7.11]) by XCH-ALN-001.cisco.com ([173.36.7.11]) with mapi id 15.00.1210.000; Fri, 5 May 2017 06:57:01 -0500 From: "Mark Townsley (townsley)" To: Stewart Bryant CC: "Alvaro Retana (aretana)" , "gen-art@ietf.org" , "spring@ietf.org" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "ietf@ietf.org" Thread-Topic: Genart last call review of draft-ietf-spring-ipv6-use-cases-10 Thread-Index: AQHSw2U/BOotKSR5yE+0kCHjckN3AaHk9L6AgADi1wCAACLZAA== Date: Fri, 5 May 2017 11:57:01 +0000 Message-ID: References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> In-Reply-To: <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.228.43.90] Content-Type: text/plain; charset="utf-8" Content-ID: <0762E6F421E4884295107E55B614AE63@emea.cisco.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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DIR:OUT; SFP:1102; SCL:1; SRVR:BN3PR05MB2707; H:BN3PR05MB2706.namprd05.prod.outlook.com; FPR:; SPF:None; MLV:sfv; LANG:en; spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_BN3PR05MB2706FD3D43B6B4B0CEF4989DD5EE0BN3PR05MB2706namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 08 May 2017 08:39:06.7575 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN3PR05MB2707 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 May 2017 08:39:13 -0000 --_000_BN3PR05MB2706FD3D43B6B4B0CEF4989DD5EE0BN3PR05MB2706namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Les, The use-case you are describing here is SRMS advertisements and there is no= problem in handling SRMS advertisements. There is a special indication in the protocol messages to i= ndicate it is an SRMS advertisement and it is documented in ISIS and OSPF drafts in detail, how to handle the s= cenario. You are suggesting to use the same procedures to handle the case of anycast= -SIDs where prefix advertisements aren't accompanied by a SID advertisements for some of the prefixes. This procedure does work for anycast-SIDs and I suggest you to add the text= to the draft to standardize. I believe conflict resolution draft is the best place= to add it. Below is my suggested text for the draft. "Section 3.2.3 Anycast SIDs [SR-ARCH] defines anycast SIDs which is used for a number of use-cases. When there are multiple nodes which advertise same anycast prefix, it is po= ssible that one of the nodes does not advertise a SID for the prefix. This discrepancy is not detected by the conflict resolution procedure as the conflict resolu= tion database takes the prefix-SID mappings as input and this particular case does not h= ave prefix-SID mapping. The forwarding plane follows IP routing and so nodes in the network MAY poi= nt to a node which does not advertise a SID. This situation is similar to an SRMS a= dvertisement where prefix reachability advertisements from a node does not include a SID= advertisement for the prefix. The route programming for such anycast SIDs should follow the PHP procedure= s as described in, [SR-ISIS] and [SR-OSPF] for an SRMS advertisement." Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Friday, May 5, 2017 12:53 PM To: Shraddha Hegde ; draft-ietf-spring-conflict-resol= ution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - I say again - there is no conflict and there is no config error. Let's use another example which does NOT involve anycast. --------------A (1.1.1.1) / G-----------------B (1.1.1.2) \ ----------------C(1.1.1.3) NO SIDS are locally configured on any routers because the operator has chos= en to use SRMS as a global provisioning tool. Therefore none of the prefix reachability advertisements include a SID. SRMS (say advertised by some node "F" ) advertises the following: 1.1.1.1/32 100 range 3 SRMS advertisements do not support P/E flags. When G forwards the following packets it has to make a decision as to wheth= er to do PHP, UHP, EXPLICIT_NULL: 1.1.1.1 to A 1.1.1.2 to B 1.1.1.3 to C But there is no advertisement of P/E for any of the destinations. It must f= ollow a default behavior. If you think there is a problem here, please clearly state what it is and w= hat you think should be done about it. But whatever you think it might be, this has nothing to do with SID conflic= t resolution - which is defining a way to resolve advertised Prefix Conflic= ts/SID Conflicts as defined in Section 3.2 of the draft. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Thursday, May 04, 2017 10:02 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org= Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, The issues we are discussing here are specific to Segment Routing and SPRIN= G is the right WG to address this. The problem here is not about standardizing what is the= default PHP behavior, it is about the scenarios when this default behavior assumpti= on need to be applied. The problem doesn't get solved by applying default PHP behavior in all case= s. Assume 1.1.1.1 in the example below is a redistributed prefix from another = ISIS Level. In that case the pop and forward will cause the service labels to get exposed at A= which would cause black-holing or misrouting. These are issues caused by config errors and IMO conflict resolution draft = is the right place to describe these cases and the solutions so that all vendors have consiste= nt behaviours. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Friday, May 5, 2017 12:05 AM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - First, there is no SID conflict here. There is therefore nothing for the co= nflict resolution draft to discuss. Let's look at your scenario more detail. To do so let's use the following s= imple topology: --------------A / G-----------------B \ ----------------C Using your example w addition of P/E flag settings in prefix-sid advertisem= ent (using IS-IS naming convention). For simplicity assume all nodes have the default SRGB (16000 - 23999). 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 P flag =3D 0 E flag = =3D 0 3. Prefix 1.1.1.1 advertised from node C with SID 10 P flag =3D 1 E flag = =3D 0 Using procedures defined in draft-ietf-spring-conflict-resolution all nodes= in the network will use SID 10 when forwarding traffic to 1.1.1.1. The que= stion is what should the penultimate next hop router do when forwarding a p= acket to each of the owning nodes? When G forwards the packet to B, PHP is indicated, so G will POP. When G forwards the packet to C, UHP is indicated and E flag is 0, so G wil= l send the packet with outgoing label 16010. When G forwards the packet to A, because A has not advertised the prefix-SI= D (but is SR capable) we do not know whether it wants PHP or not - so we ha= ve to make an assumption. Default MPLS behavior is to assume PHP. If A does not want PHP then it would have to advertise the prefix SID so it= could specify desired behavior using P/E flags. Note that this same situation can occur if the mapping server is used as a = global provisioning tool. In such a case no prefix-SIDs need be advertised = in prefix reachability advertisements - all SIDs are advertised by SRMS adv= ertisements which do not include P/E flags. Historically, MPLS implementations have chosen a default behavior (equival= ent to P and E flags =3D 0). Some implementations provide knobs to override= this behavior. If your concern is that there is not an explicit definition of default PHP/= Explicit NULL behavior, then I think this needs to be directed at the MPLS = WG. I do not claim to be an MPLS expert, but I have found these references: RFC 3036 Section 6 "- Section 2.16 of the MPLS architecture [RFC3031] requires that the initial label distribution protocol negotiation between peer LSRs enable each LSR to determine whether its peer is capable of popping the label stack. This version of LDP assumes that LSRs support label popping for all link types except ATM and Frame Relay. A future version may specify means to make this determination part of the session initiation negotiation." Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 10:16 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org= Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, >From what you describe in section 3.3.8, all the SIDs attached to prefixes = are fed into the database. The example I am talking about, 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 3. Prefix 1.1.1.1 advertised from node C with SID 10 The advertisements 2 and 3 are fed into the mapping database and 1 isn't. The conflict resolution does not detect any conflict with the above adverti= sements and For prefix 1.1.1.1 /SID 10 is chosen. All this is fine but the problem is in programming the forwarding plane. Lets say for a certain node E in the network node A is the nexthop for 1.1.= 1.1. How would node E program its forwarding plane? Node E should recognize the conflict between node A, Node B and C and progr= am the SID 10 with a pop and forward instead of looking into the P and E flags of = the SID 10? This is good enough detail, that should be explained in the draft instead o= f leaving it to the Imagination of implementers. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 3, 2017 11:47 PM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - There is a misunderstanding on your part. It would be good if you read Sect= ion 3.3.8. Guaranteeing Database Consistency again. In short, it does not matter whether you do or do not advertise a prefix SI= D for a prefix which you own. What matters is that all routers populate the= mapping entry database consistent w Section 3.3.8 and that each router app= lies the conflict resolution rules in a consistent manner. Then all routers= will be using the same prefix/SID pair in forwarding. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_BN3PR05MB2706FD3D43B6B4B0CEF4989DD5EE0BN3PR05MB2706namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Les,

 

The use-case you are describing here = is SRMS advertisements and there is no problem in handling SRMS<= /span>

advertisements. There is a special in= dication in the protocol messages to indicate it is an SRMS advertisement

and it is documented in ISIS and OSPF= drafts in detail, how to handle the scenario.

 

You are suggesting to use the same pr= ocedures to handle the case of anycast-SIDs where prefix advertisements are= n’t

accompanied by a SID advertisements f= or some of the prefixes.

This procedure does work for anycast-= SIDs and I suggest you to add the text to the

draft to standardize. I believe confl= ict resolution draft is the best place to add it.

Below is my suggested text for the dr= aft.

 

“Section 3.2.3 Anycast SIDs

[SR-ARCH] defines anycast SIDs which = is used for a number of use-cases.

When there are multiple nodes which a= dvertise same anycast prefix, it is possible that

one of the nodes does not advertise a= SID for the prefix. This discrepancy

is not detected by the conflict resol= ution procedure as the conflict resolution database

takes the prefix-SID mappings as inpu= t and this particular  case does not have

prefix-SID mapping.=

 

The forwarding plane follows IP routi= ng and so nodes in the network MAY point to a

node which does not advertise a SID. = This situation is similar to an SRMS advertisement

where prefix reachability advertiseme= nts from a node does not include a SID advertisement for the prefix.

The route programming for such anycas= t SIDs should follow the PHP procedures as described in,<= /p>

[SR-ISIS] and [SR-OSPF] for an SRMS a= dvertisement.”

 

 

Rgds

Shraddha

 

From: Les Ginsberg (ginsberg) [mailt= o:ginsberg@cisco.com]
Sent: Friday, May 5, 2017 12:53 PM
To: Shraddha Hegde <shraddha@juniper.net>; draft-ietf-spring-c= onflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 

I say again – there is no confl= ict and there is no config error.

 

Let’s use another example which= does NOT involve anycast.

 

       = --------------A (1.1.1.1)

  /

G-----------------B (1.1.1.2)

  \

     ------------= ----C(1.1.1.3)

 

NO SIDS are locally configured on any= routers because the operator has chosen to use SRMS as a global provisioni= ng tool.

Therefore none of the prefix reachabi= lity advertisements include a SID.

 

SRMS (say advertised by some node = 220;F” ) advertises the following:

 

1.1.1.1/32 100 range 3

SRMS advertisements do not support P/= E flags.

 

When G forwards the following packets= it has to make a decision as to whether to do PHP, UHP, EXPLICIT_NULL:

 

= 1.1.1.1  &= nbsp; to A

= 1.1.1.2  &= nbsp; to B

= 1.1.1.3  &= nbsp; to C

 

But there is no advertisement of P/E = for any of the destinations. It must follow a default behavior.<= /span>

 

If you think there is a problem here,= please clearly state what it is and what you think should be done about it= .

 

But whatever you think it might be, t= his has nothing to do with SID conflict resolution – which is definin= g a way to resolve advertised Prefix Conflicts/SID Conflicts as defined in Section 3.2 of the draft.

 

   Les

 

 

 

From: Shraddha Hegde [mailto:shraddha@juniper.net]
Sent: Thursday, May 04, 2017 10:02 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 

The issues we are discussing here are= specific to Segment Routing and SPRING is the right

WG to address this. The problem here = is not about standardizing what is the default

PHP behavior, it is about the scenari= os when this default behavior assumption need to be applied.

 

The problem doesn’t get solved = by applying default PHP behavior in all cases.

Assume 1.1.1.1 in the example below i= s a redistributed prefix from another ISIS Level. In that=

case  the pop and forward will c= ause the service labels to get exposed at A which

would cause black-holing or misroutin= g.

 

These are issues caused by config err= ors and IMO conflict resolution draft is the right place<= /p>

to describe these cases and the solut= ions so that all vendors have consistent behaviours.

 

 

Rgds

Shraddha

 

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Friday, May 5, 2017 12:05 AM
To: Shraddha Hegde <shrad= dha@juniper.net>; draft-iet= f-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 

First, there is no SID conflict here.= There is therefore nothing for the conflict resolution draft to discuss.

 

Let’s look at your scenario mor= e detail. To do so let’s use the following simple topology:

 

 

       = --------------A

  /

G-----------------B=

  \

     ------------= ----C

 

Using your example w addition of P/E = flag settings in prefix-sid advertisement (using IS-IS naming convention).<= o:p>

For simplicity assume all nodes have = the default SRGB (16000 – 23999).

 

1.prefix 1.1.1.1 advertised from node= A with no SID

2.Prefix 1.1.1.1 advertised from node= B with SID 10  P flag =3D 0 E flag =3D 0

3. Prefix 1.1.1.1 advertised from nod= e C with SID 10 P flag =3D 1  E flag =3D 0

 

Using procedures defined in draft-iet= f-spring-conflict-resolution all nodes in the network will use SID 10 when = forwarding traffic to 1.1.1.1. The question is what should the penultimate next hop router do when forwarding a packet to= each of the owning nodes?

 

When G forwards the packet to B, PHP = is indicated, so G will POP.

When G forwards the packet to C, UHP = is indicated and E flag is 0, so G will send the packet with outgoing label= 16010.

 

When G forwards the packet to A, beca= use A has not advertised the prefix-SID (but is SR capable) we do not know = whether it wants PHP or not – so we have to make an assumption.

Default MPLS behavior is to assume PH= P.

If A does not want PHP then it would = have to advertise the prefix SID so it could specify desired behavior using= P/E flags.

 

Note that this same situation can occ= ur if the mapping server is used as a global provisioning tool. In such a c= ase no prefix-SIDs need be advertised in prefix reachability advertisements – all SIDs are advertised by SRMS advert= isements which do not include P/E flags.

 

Historically,  MPLS implementati= ons have chosen a default behavior (equivalent to P and E flags =3D 0). Som= e implementations provide knobs to override this behavior.

 

If your concern is that there is not = an explicit definition of default PHP/Explicit NULL behavior, then I think = this needs to be directed at the MPLS WG. I do not claim to be an MPLS expert, but I have found these references:

 

RFC 3036 Section 6<= /p>

 

“-  Section 2.16 of the MP= LS architecture [RFC3031] requires that

      &= nbsp;  the initial label distribution protocol negotiation between

      &= nbsp;  peer LSRs enable each LSR to determine whether its peer is=

      &= nbsp;  capable of popping the label stack.  This version of LDP

      &= nbsp;  assumes that LSRs support label popping for all link types=

      &= nbsp;  except ATM and Frame Relay.  A future version may specify = means

      &= nbsp;  to make this determination part of the session initiation<= /o:p>

      &= nbsp;  negotiation.”

 

   Les

 

From: Shraddha Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 10:16 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@iet= f.org
Cc: spring@ietf.org=
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 

From what you describe in section 3.3= .8, all the SIDs attached to prefixes are fed into the database.=

The example I am talking about,

 

1.prefix 1.1.1.1 advertised from node= A with no SID

2.Prefix 1.1.1.1 advertised from node= B with SID 10

3. Prefix 1.1.1.1 advertised from nod= e C with SID 10

 

The advertisements 2 and 3 are fed in= to the mapping database and 1 isn’t.

 

The conflict resolution does not dete= ct any conflict with the above advertisements and

For prefix 1.1.1.1 /SID 10 is chosen.=

All this is fine but the problem is i= n programming the forwarding plane.

 

Lets say for a certain node E in the = network node A is the nexthop for 1.1.1.1.

How would node E program its forwardi= ng plane?

 

Node E should recognize the conflict = between node A, Node B and C and program the

SID 10 with a pop and forward instead= of looking into the P and E flags of the SID 10?

 

This is good enough detail, that shou= ld be explained in the draft instead of leaving it to the=

Imagination of implementers.

 

Rgds

Shraddha

 

 

 

 

 

Shraddha –

 

There is a misunderstanding on your p= art. It would be good if you read Section 3.3.8.  Guaranteeing Databas= e Consistency again.

 

In short, it does not matter whether = you do or do not advertise a prefix SID for a prefix which you own. What ma= tters is that all routers populate the mapping entry database consistent w Section 3.3.8 and that each router applies the= conflict resolution rules in a consistent manner. Then all routers will be= using the same prefix/SID pair in forwarding.

 

   Les

 

 

From: Shraddha Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org=
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addresses assign= ed to different nodes and one or more nodes

do not advertise a Prefix SID for that anycast addr= ess but other nodes advertise a prefix-sid, there is a possibility

of different implementations behaving differently w= ith respect to programming the labelled routes.

 

This scenario should be considered as a prefix conf= lict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with the relevant= text to describe the behavior.

 

 

Rgds

Shraddha

 

--_000_BN3PR05MB2706FD3D43B6B4B0CEF4989DD5EE0BN3PR05MB2706namp_-- From nobody Mon May 8 03:16:06 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AAAEF1292C5; Mon, 8 May 2017 03:16:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.6 X-Spam-Level: X-Spam-Status: No, score=-0.6 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OYLgCNoxX8YH; Mon, 8 May 2017 03:16:03 -0700 (PDT) Received: from mail-wr0-x244.google.com (mail-wr0-x244.google.com [IPv6:2a00:1450:400c:c0c::244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1E6A4126FB3; Mon, 8 May 2017 03:16:03 -0700 (PDT) Received: by mail-wr0-x244.google.com with SMTP id g12so7710991wrg.2; Mon, 08 May 2017 03:16:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=otNqVbd/gv619R2if1cwTHsQmKj5wW3dKdwjbrU36NI=; b=BtrP+lFrfAtLE1aW7ms1huOJ7iLQEUSg9AfrjOvx+3nPT05RA/F8VvPngnrSpYsSjs JhTaHklQZm1YNmBdWq5dJssZ9Aoz/QYfclkSKg/zMXqlj7drPZ3Ko0k4LN4u2RykFr0b R/rlHD81GvHi3at5m89s2roKN6dEXkESpFD/KFuLLwOfM9YprALep8c4IXnrhUV5uLHu sI4OQy6dUSxdo9+0wNosBLAitQ3FsPmvSQFCAteAoqev8lXCd9icdeTSq6dlaHpYGsTD 6nemctLd5AwcSxeO5IUe9ycLoCBujIyNufiYes5YQ2MdnqM/bTvqIj1tpUpKjtjoVPGZ 4jPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=otNqVbd/gv619R2if1cwTHsQmKj5wW3dKdwjbrU36NI=; b=NqAfu8ZiXMt3wdJec/L+/K2O3mg0CZdT1EG4Fe3/TREogCLTQcUc+LVxhcldgf8CuG /WhunyPRRNkumYpHzRPKsNr7mLQ7XKZWvtX1u6Rb0JfoA1uBrwD+bkZM/LPcUbhRvE4i LZr+1isB08TR6eGu4shcDjJUDploTOjyHD+i8nTB/agVspJnQ+8oQ7AWtenMzapmtge+ jFkQP1uwLxgYh3zJESJPbkH8L5moy0g0FJHbKsE/R0bDXkUlV3vbaay6w6uNJHnyNeHl 7boSp3C9Ym+bN++ifgm9tScgQzs0vV2+tb6xFunZlUBl/gMvPWFvv2d9cwobOwqpYwmY 62Jg== X-Gm-Message-State: AN3rC/4XtdzP3z/DqH8+tA8IqXlYBTUQ2bTbiPCEVHHtGhRW5eq96oY1 1H1nhhXbF97s3XCMnFz8Iw== X-Received: by 10.223.147.97 with SMTP id 88mr36914030wro.134.1494238561473; Mon, 08 May 2017 03:16:01 -0700 (PDT) Received: from [192.168.2.126] (host213-123-124-182.in-addr.btopenworld.com. [213.123.124.182]) by smtp.gmail.com with ESMTPSA id j133sm9679706wmg.26.2017.05.08.03.16.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 May 2017 03:16:01 -0700 (PDT) To: Robert Raszuk , stefano previdi References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> Cc: IETF Discussion , "Alvaro Retana (aretana)" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "gen-art@ietf.org" , "spring@ietf.org" From: Stewart Bryant Message-ID: <28cabccc-5426-9938-e2bf-169de0959ddc@gmail.com> Date: Mon, 8 May 2017 11:15:46 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 May 2017 10:16:05 -0000 On 05/05/2017 11:17, Robert Raszuk wrote: > And to add one observation .. > > Stewart makes a point that SR-MPLS can be deployed without mpls > control plane. > > Well it sure does not require LDP however IGP or BGP extensions for > SR-MPLS signalling is also an example of mpls control plane ... even > if much simpler than traditional cases it is still required. Yes, but those are required anyway to support SRv6. You always have to provide the mapping between the function, the function identifier and the function location. - Stewart From nobody Mon May 8 05:13:08 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 27CD4127137; Mon, 8 May 2017 05:12:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.399 X-Spam-Level: X-Spam-Status: No, score=-2.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.199, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id V24cOp6NsUMB; Mon, 8 May 2017 05:12:52 -0700 (PDT) Received: from mail-it0-x230.google.com (mail-it0-x230.google.com [IPv6:2607:f8b0:4001:c0b::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C657C127077; Mon, 8 May 2017 05:12:52 -0700 (PDT) Received: by mail-it0-x230.google.com with SMTP id o5so64701747ith.1; Mon, 08 May 2017 05:12:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=DEw0636DT+LHPwPQHoTyJb79xvdPPhvrhz0Bmz2nhhU=; b=sdtOPGIvBh04o72AAUPSDCVN0d6TJoMJ6dBHQ1q5x6bs04Cc4DzOyqpKuf+ss9AcYM dm/a4WM5Nm/24CGeS3sZJIVMdPo/D5/kt1jge690jqEeBAO9KSz+U3VoY6L/jA2AgJT5 thDtybgcA0ymwE40kGpZPstxKPzE9xralysiRPZM1gEJ/0UnPvLgF9OmbgfegNR2vrbN PqGBKIAX8VBqe/Qmf5dLGuSNSBzotZXSTFi+u5zI5JHmziIHe0OILFfqp8/Fqw54tNV1 UV9ix+HeLaUel4Dyw39z/YAOeaIVsfYvlUtHRDk/4oaJobOyZbZj8y2nOmFgFJEj+0rN s6dQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=DEw0636DT+LHPwPQHoTyJb79xvdPPhvrhz0Bmz2nhhU=; b=ggYXpVIDTmal8i+ccJoDWM0Vg/RGv1bRMmuGmnFSi6x7HOJm5eWkKkpKs+jNA9rQYv mmLt989iIkhru7vYylzzalPtM/ni8CC7X2naAQh0Qn/pRZHh19JAE2xcYoMThDxdDkG8 l/egt1Bxg7Jls7Bhd6UtjlOhaEiYpVZM2b/+N4LwJiL3Dbw++VOPayjlrInT2iKHe1r5 ucz92i3Jhh6/MgVYtKBDE2iKvaMVMgmTlGfqO4PycKiUMNkToHNOF87JmEvF1bi6G3VW 7DPSMjfchUBLDFq/oosUTy9TzK/1YgFpMpdlp69Sm9790kJoZwd484PpZbs2VoDMPZRE ZEWQ== X-Gm-Message-State: AN3rC/4p6DcHNVO2NPlY621KeZi5P7TJE7zJGn3Cit0SvQK2c6rdmISi OLl2Wqx4zzmisKthBLMB+HPAN083Qw== X-Received: by 10.36.125.197 with SMTP id b188mr19525052itc.59.1494245572101; Mon, 08 May 2017 05:12:52 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.79.62.24 with HTTP; Mon, 8 May 2017 05:12:51 -0700 (PDT) In-Reply-To: <28cabccc-5426-9938-e2bf-169de0959ddc@gmail.com> References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> <28cabccc-5426-9938-e2bf-169de0959ddc@gmail.com> From: Robert Raszuk Date: Mon, 8 May 2017 14:12:51 +0200 X-Google-Sender-Auth: MHaCcDzodrmDLFJVGoCU5lXV5o8 Message-ID: To: Stewart Bryant Cc: stefano previdi , IETF Discussion , "Alvaro Retana (aretana)" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "gen-art@ietf.org" , "spring@ietf.org" Content-Type: multipart/alternative; boundary=001a114043b0884fbe054f0228a8 Archived-At: Subject: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 May 2017 12:12:54 -0000 --001a114043b0884fbe054f0228a8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Stewart, > =E2=80=8B Yes, but those are required anyway to support SRv6 That is incorrect. Please watch Les's presentation during last IETF where he clearly and correctly stated that IGP extensions for SRv6 are optional and not required (unlike in the case of SR-MPLS where such signalling of global labels is indeed necessary to build "global labels" based forwarding). As a matter of fact I knew this will generate confusion in IETF and recommended to make it very clear in the drafts. Distribution of SID functions does not need to be carried in routing protocols. And SRv6 SID locator function is native to IPv6 routing hence no extensions needed. Sure they can be carried in IGPs or BGP but this is just an option not necessity. Best, Robert. On Mon, May 8, 2017 at 12:15 PM, Stewart Bryant wrote: > > > On 05/05/2017 11:17, Robert Raszuk wrote: > >> And to add one observation .. >> >> Stewart makes a point that SR-MPLS can be deployed without mpls control >> plane. >> >> Well it sure does not require LDP however IGP or BGP extensions for >> SR-MPLS signalling is also an example of mpls control plane ... even if >> much simpler than traditional cases it is still required. >> > > =E2=80=8B=E2=80=8B > Yes, but those are required anyway to support SRv6. You always have to > provide the mapping between the function, the function identifier and the > function location. > > - Stewart > > --001a114043b0884fbe054f0228a8 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Hi Stewart,

> =E2=80= =8B
Yes, but those are re= quired anyway to support SRv6

That is incorrect.=C2=A0

Pl= ease watch Les's presentation during last IETF where he clearly and cor= rectly stated that IGP extensions for SRv6 are optional and not required (u= nlike in the case of SR-MPLS where such signalling of global labels is inde= ed necessary to build "global labels" based forwarding).=C2=A0
<= br>
As a matter of fact I knew this will generate confusion in IETF and re= commended to make it very clear in the drafts. Distribution of SID function= s does not need to be carried in routing protocols. And SRv6 SID locator fu= nction is native to IPv6 routing hence no extensions needed. Sure they can = be carried in IGPs or BGP but this is just an option not necessity.=C2=A0
=
Best,
Robert.


<= br>
On Mon, May 8, 2017 at 12:15 PM, Stewart Brya= nt <stewart.bryant@gmail.com> wrote:


On 05/05/2017 11:17, Robert Raszuk wrote:
And to add one observation ..

Stewart makes a point that SR-MPLS can be deployed without mpls control pla= ne.

Well it sure does not require LDP however IGP or BGP extensions for SR-MPLS= signalling is also an example of mpls control plane ... even if much simpl= er than traditional cases it is still required.
=E2=80=8B=E2=80=8B
Yes, but those ar= e required anyway to support SRv6. You always have to provide the mapping b= etween the function, the function identifier and the function location.

- Stewart


--001a114043b0884fbe054f0228a8-- From nobody Mon May 8 10:40:09 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 35B571270FC; Mon, 8 May 2017 10:40:08 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.50.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149426520816.26587.16027048747853767854@ietfa.amsl.com> Date: Mon, 08 May 2017 10:40:08 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-resiliency-use-cases-10.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 May 2017 17:40:08 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking of the IETF. Title : Resiliency use cases in SPRING networks Authors : Clarence Filsfils Stefano Previdi Bruno Decraene Rob Shakir Filename : draft-ietf-spring-resiliency-use-cases-10.txt Pages : 11 Date : 2017-05-08 Abstract: This document identifies and describes the requirements for a set of use cases related to network resiliency on Segment Routing (SPRING) networks. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-resiliency-use-cases/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-resiliency-use-cases-10 https://datatracker.ietf.org/doc/html/draft-ietf-spring-resiliency-use-cases-10 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-resiliency-use-cases-10 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon May 8 10:41:26 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4833B129537 for ; Mon, 8 May 2017 10:41:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.523 X-Spam-Level: X-Spam-Status: No, score=-14.523 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jIitdnU9pSju for ; Mon, 8 May 2017 10:41:24 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EB667128768 for ; Mon, 8 May 2017 10:41:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1809; q=dns/txt; s=iport; t=1494265283; x=1495474883; h=from:to:subject:date:message-id:references:in-reply-to: content-id:content-transfer-encoding:mime-version; bh=DzMGHUyvC/HSdG3ckdNkmBxT6/vU7c7AmJoXxnqi0Mw=; b=AOOJdKGnHVemB+Gu1dWXnDBbFd1j4plgK0tAXq7VsM+hrXOKQ4o3Z3fx AJKZYieuFZKEqnI83CVUihTQDMPUTGdKWKn2XRRcGGwdi9OApM27hD/G+ v3CmVm9wWEBo+KR0D/fx3TE4p0k/MYxz1DUuD1tF4XggicUjoupZmf2FP o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DNAABZrRBZ/40NJK1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1VigQwHjXmRV5Vygg8hDYUsSgKEZT8YAQIBAQEBAQEBayiFFQE?= =?us-ascii?q?BAQECAQEBODQQCwIBCBgeECcLJQIEE4oYCA61NIp0AQEBAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBHYZfggmCcIMhgUKDOIIxBZ15AYcbi3yCBFWEZ4oslD0BHziBCnAVHCo?= =?us-ascii?q?SAYZgdodegQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.38,310,1491264000"; d="scan'208";a="245702416" Received: from alln-core-8.cisco.com ([173.36.13.141]) by rcdn-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 08 May 2017 17:41:23 +0000 Received: from XCH-RTP-009.cisco.com (xch-rtp-009.cisco.com [64.101.220.149]) by alln-core-8.cisco.com (8.14.5/8.14.5) with ESMTP id v48HfMVY024411 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Mon, 8 May 2017 17:41:23 GMT Received: from xch-rtp-010.cisco.com (64.101.220.150) by XCH-RTP-009.cisco.com (64.101.220.149) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 8 May 2017 13:41:22 -0400 Received: from xch-rtp-010.cisco.com ([64.101.220.150]) by XCH-RTP-010.cisco.com ([64.101.220.150]) with mapi id 15.00.1210.000; Mon, 8 May 2017 13:41:21 -0400 From: "Stefano Previdi (sprevidi)" To: SPRING WG Thread-Topic: [spring] I-D Action: draft-ietf-spring-resiliency-use-cases-10.txt Thread-Index: AQHSyCIoLJEwZpKRI0e16lGASaY6naHq93IA Date: Mon, 8 May 2017 17:41:21 +0000 Message-ID: References: <149426520816.26587.16027048747853767854@ietfa.amsl.com> In-Reply-To: <149426520816.26587.16027048747853767854@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.86.222] Content-Type: text/plain; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [spring] I-D Action: draft-ietf-spring-resiliency-use-cases-10.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 May 2017 17:41:25 -0000 Now, hopefully, this version addresses all comments (one was missing). s. > On May 8, 2017, at 7:40 PM, internet-drafts@ietf.org wrote: >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Source Packet Routing in Networking of t= he IETF. >=20 > Title : Resiliency use cases in SPRING networks > Authors : Clarence Filsfils > Stefano Previdi > Bruno Decraene > Rob Shakir > Filename : draft-ietf-spring-resiliency-use-cases-10.txt > Pages : 11 > Date : 2017-05-08 >=20 > Abstract: > This document identifies and describes the requirements for a set of > use cases related to network resiliency on Segment Routing (SPRING) > networks. >=20 >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-spring-resiliency-use-cases/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-spring-resiliency-use-cases-10 > https://datatracker.ietf.org/doc/html/draft-ietf-spring-resiliency-use-ca= ses-10 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-resiliency-use-case= s-10 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Mon May 8 15:12:37 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5D214127978; 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08 May 2017 22:12:30 +0000 Received: from XCH-RCD-001.cisco.com (xch-rcd-001.cisco.com [173.37.102.11]) by alln-core-8.cisco.com (8.14.5/8.14.5) with ESMTP id v48MCUOP020967 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 8 May 2017 22:12:30 GMT Received: from xch-aln-001.cisco.com (173.36.7.11) by XCH-RCD-001.cisco.com (173.37.102.11) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 8 May 2017 17:12:29 -0500 Received: from xch-aln-001.cisco.com ([173.36.7.11]) by XCH-ALN-001.cisco.com ([173.36.7.11]) with mapi id 15.00.1210.000; Mon, 8 May 2017 17:12:29 -0500 From: "Les Ginsberg (ginsberg)" To: Shraddha Hegde , "draft-ietf-spring-conflict-resolution@ietf.org" CC: "spring@ietf.org" Thread-Topic: Mail regarding draft-ietf-spring-conflict-resolution Thread-Index: AdLEK6gAqg4DUgoVTleNTb+KJq8tswADTO5AABYn9bAAG8P6sAAWfQLAAAUbuzAAmY1d4AAbp1Dg Date: Mon, 8 May 2017 22:12:29 +0000 Message-ID: <317690a321234127b95bb6e0f145a2a0@XCH-ALN-001.cisco.com> References: <97e3921eb1014725a484156d96191570@XCH-ALN-001.cisco.com> <0c0d0e56b13f47d2918c6cba51562a89@XCH-ALN-001.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.136.176] Content-Type: multipart/alternative; boundary="_000_317690a321234127b95bb6e0f145a2a0XCHALN001ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 May 2017 22:12:35 -0000 --_000_317690a321234127b95bb6e0f145a2a0XCHALN001ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Shraddha - We are still not on the same page. The text you mention as regards handling SRMS advertisements in the IGP dra= fts (e.g. Section 2.4.5.2 in https://www.ietf.org/id/draft-ietf-isis-segmen= t-routing-extensions-12.txt ) is discussing how one determines if the adver= tiser of the prefix is also the owner of the prefix. This is necessary to d= etermine if a node is or is not the penultimate nexthop. The question I believe you are raising is - once a node has determined that= it IS the penultimate nexthop - how does it determine whether it should do= PHP/UHP and/or use EXPLICIT_NULL. The point I have made below is that in the absence of a prefix_sid advertis= ement you do not have explicit settings for P/E bits and therefore have to = rely on a default behavior. This is true whenever you have a SID for a pref= ix but you do not have a prefix-SID advertisement from the originating node= . AS we have discussed below this can happen when the SID is advertised sol= ely in SRMS advertisements or (in the case of anycast) when a SID is advert= ised by a subset of the nodes supporting the anycast address. This is NOT the subject of the Conflict Resolution draft - so no text belon= gs there. And I am not convinced anything needs to be said about this. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Monday, May 08, 2017 1:39 AM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, The use-case you are describing here is SRMS advertisements and there is no= problem in handling SRMS advertisements. There is a special indication in the protocol messages to i= ndicate it is an SRMS advertisement and it is documented in ISIS and OSPF drafts in detail, how to handle the s= cenario. You are suggesting to use the same procedures to handle the case of anycast= -SIDs where prefix advertisements aren't accompanied by a SID advertisements for some of the prefixes. This procedure does work for anycast-SIDs and I suggest you to add the text= to the draft to standardize. I believe conflict resolution draft is the best place= to add it. Below is my suggested text for the draft. "Section 3.2.3 Anycast SIDs [SR-ARCH] defines anycast SIDs which is used for a number of use-cases. When there are multiple nodes which advertise same anycast prefix, it is po= ssible that one of the nodes does not advertise a SID for the prefix. This discrepancy is not detected by the conflict resolution procedure as the conflict resolu= tion database takes the prefix-SID mappings as input and this particular case does not h= ave prefix-SID mapping. The forwarding plane follows IP routing and so nodes in the network MAY poi= nt to a node which does not advertise a SID. This situation is similar to an SRMS a= dvertisement where prefix reachability advertisements from a node does not include a SID= advertisement for the prefix. The route programming for such anycast SIDs should follow the PHP procedure= s as described in, [SR-ISIS] and [SR-OSPF] for an SRMS advertisement." Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Friday, May 5, 2017 12:53 PM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - I say again - there is no conflict and there is no config error. Let's use another example which does NOT involve anycast. --------------A (1.1.1.1) / G-----------------B (1.1.1.2) \ ----------------C(1.1.1.3) NO SIDS are locally configured on any routers because the operator has chos= en to use SRMS as a global provisioning tool. Therefore none of the prefix reachability advertisements include a SID. SRMS (say advertised by some node "F" ) advertises the following: 1.1.1.1/32 100 range 3 SRMS advertisements do not support P/E flags. When G forwards the following packets it has to make a decision as to wheth= er to do PHP, UHP, EXPLICIT_NULL: 1.1.1.1 to A 1.1.1.2 to B 1.1.1.3 to C But there is no advertisement of P/E for any of the destinations. It must f= ollow a default behavior. If you think there is a problem here, please clearly state what it is and w= hat you think should be done about it. But whatever you think it might be, this has nothing to do with SID conflic= t resolution - which is defining a way to resolve advertised Prefix Conflic= ts/SID Conflicts as defined in Section 3.2 of the draft. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Thursday, May 04, 2017 10:02 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org= Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, The issues we are discussing here are specific to Segment Routing and SPRIN= G is the right WG to address this. The problem here is not about standardizing what is the= default PHP behavior, it is about the scenarios when this default behavior assumpti= on need to be applied. The problem doesn't get solved by applying default PHP behavior in all case= s. Assume 1.1.1.1 in the example below is a redistributed prefix from another = ISIS Level. In that case the pop and forward will cause the service labels to get exposed at A= which would cause black-holing or misrouting. These are issues caused by config errors and IMO conflict resolution draft = is the right place to describe these cases and the solutions so that all vendors have consiste= nt behaviours. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Friday, May 5, 2017 12:05 AM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - First, there is no SID conflict here. There is therefore nothing for the co= nflict resolution draft to discuss. Let's look at your scenario more detail. To do so let's use the following s= imple topology: --------------A / G-----------------B \ ----------------C Using your example w addition of P/E flag settings in prefix-sid advertisem= ent (using IS-IS naming convention). For simplicity assume all nodes have the default SRGB (16000 - 23999). 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 P flag =3D 0 E flag = =3D 0 3. Prefix 1.1.1.1 advertised from node C with SID 10 P flag =3D 1 E flag = =3D 0 Using procedures defined in draft-ietf-spring-conflict-resolution all nodes= in the network will use SID 10 when forwarding traffic to 1.1.1.1. The que= stion is what should the penultimate next hop router do when forwarding a p= acket to each of the owning nodes? When G forwards the packet to B, PHP is indicated, so G will POP. When G forwards the packet to C, UHP is indicated and E flag is 0, so G wil= l send the packet with outgoing label 16010. When G forwards the packet to A, because A has not advertised the prefix-SI= D (but is SR capable) we do not know whether it wants PHP or not - so we ha= ve to make an assumption. Default MPLS behavior is to assume PHP. If A does not want PHP then it would have to advertise the prefix SID so it= could specify desired behavior using P/E flags. Note that this same situation can occur if the mapping server is used as a = global provisioning tool. In such a case no prefix-SIDs need be advertised = in prefix reachability advertisements - all SIDs are advertised by SRMS adv= ertisements which do not include P/E flags. Historically, MPLS implementations have chosen a default behavior (equival= ent to P and E flags =3D 0). Some implementations provide knobs to override= this behavior. If your concern is that there is not an explicit definition of default PHP/= Explicit NULL behavior, then I think this needs to be directed at the MPLS = WG. I do not claim to be an MPLS expert, but I have found these references: RFC 3036 Section 6 "- Section 2.16 of the MPLS architecture [RFC3031] requires that the initial label distribution protocol negotiation between peer LSRs enable each LSR to determine whether its peer is capable of popping the label stack. This version of LDP assumes that LSRs support label popping for all link types except ATM and Frame Relay. A future version may specify means to make this determination part of the session initiation negotiation." Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 10:16 PM To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org= Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Les, >From what you describe in section 3.3.8, all the SIDs attached to prefixes = are fed into the database. The example I am talking about, 1.prefix 1.1.1.1 advertised from node A with no SID 2.Prefix 1.1.1.1 advertised from node B with SID 10 3. Prefix 1.1.1.1 advertised from node C with SID 10 The advertisements 2 and 3 are fed into the mapping database and 1 isn't. The conflict resolution does not detect any conflict with the above adverti= sements and For prefix 1.1.1.1 /SID 10 is chosen. All this is fine but the problem is in programming the forwarding plane. Lets say for a certain node E in the network node A is the nexthop for 1.1.= 1.1. How would node E program its forwarding plane? Node E should recognize the conflict between node A, Node B and C and progr= am the SID 10 with a pop and forward instead of looking into the P and E flags of = the SID 10? This is good enough detail, that should be explained in the draft instead o= f leaving it to the Imagination of implementers. Rgds Shraddha From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 3, 2017 11:47 PM To: Shraddha Hegde >; dra= ft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution Shraddha - There is a misunderstanding on your part. It would be good if you read Sect= ion 3.3.8. Guaranteeing Database Consistency again. In short, it does not matter whether you do or do not advertise a prefix SI= D for a prefix which you own. What matters is that all routers populate the= mapping entry database consistent w Section 3.3.8 and that each router app= lies the conflict resolution rules in a consistent manner. Then all routers= will be using the same prefix/SID pair in forwarding. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_317690a321234127b95bb6e0f145a2a0XCHALN001ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Shraddha –

 <= /p>

We are still not on the s= ame page.

 <= /p>

The text you mention as r= egards handling SRMS advertisements in the IGP drafts (e.g. Section 2.4.5.2= in https://www.ietf.org/id/draft-ietf-isis-segment-routing-extensions-12.txt ) is discussing how one determines if the advertiser of the prefix is al= so the owner of the prefix. This is necessary to determine if a node is or = is not the penultimate nexthop.

 <= /p>

The question I believe yo= u are raising is – once a node has determined that it IS the penultim= ate nexthop – how does it determine whether it should do PHP/UHP and/or use EXPLICIT_NULL.

 <= /p>

The point I have made bel= ow is that in the absence of a prefix_sid advertisement you do not have exp= licit settings for P/E bits and therefore have to rely on a default behavior. This is true whenever you have a SID for a prefix but = you do not have a prefix-SID advertisement from the originating node. AS we= have discussed below this can happen when the SID is advertised solely in = SRMS advertisements or (in the case of anycast) when a SID is advertised by a subset of the nodes supporting t= he anycast address.

 <= /p>

This is NOT the subject o= f the Conflict Resolution draft – so no text belongs there. And I am = not convinced anything needs to be said about this.

 <= /p>

   Les

 <= /p>

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:shraddha@juniper.net]
Sent: Monday, May 08, 2017 1:39 AM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@i= etf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 <= /p>

The use-case you are desc= ribing here is SRMS advertisements and there is no problem in handling SRMS=

advertisements. There is = a special indication in the protocol messages to indicate it is an SRMS adv= ertisement

and it is documented in I= SIS and OSPF drafts in detail, how to handle the scenario.

 <= /p>

You are suggesting to use= the same procedures to handle the case of anycast-SIDs where prefix advert= isements aren’t

accompanied by a SID adve= rtisements for some of the prefixes.

This procedure does work = for anycast-SIDs and I suggest you to add the text to the=

draft to standardize. I b= elieve conflict resolution draft is the best place to add it.

Below is my suggested tex= t for the draft.

 <= /p>

“Section 3.2.3 Anyc= ast SIDs

[SR-ARCH] defines anycast= SIDs which is used for a number of use-cases.

When there are multiple n= odes which advertise same anycast prefix, it is possible that

one of the nodes does not= advertise a SID for the prefix. This discrepancy

is not detected by the co= nflict resolution procedure as the conflict resolution database<= /span>

takes the prefix-SID mapp= ings as input and this particular  case does not have

prefix-SID mapping.<= /o:p>

 <= /p>

The forwarding plane foll= ows IP routing and so nodes in the network MAY point to a=

node which does not adver= tise a SID. This situation is similar to an SRMS advertisement

where prefix reachability= advertisements from a node does not include a SID advertisement for the pr= efix.

The route programming for= such anycast SIDs should follow the PHP procedures as described in,

[SR-ISIS] and [SR-OSPF] f= or an SRMS advertisement.”

 <= /p>

 <= /p>

Rgds

Shraddha

 <= /p>

From: Les Gi= nsberg (ginsberg) [mailto:ginsberg@ci= sco.com]
Sent: Friday, May 5, 2017 12:53 PM
To: Shraddha Hegde <shrad= dha@juniper.net>; draft-iet= f-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 <= /p>

I say again – there= is no conflict and there is no config error.

 <= /p>

Let’s use another e= xample which does NOT involve anycast.

 <= /p>

    &= nbsp;  --------------A (1.1.1.1)

  /

G-----------------B (1.1.= 1.2)

  \

     = ----------------C(1.1.1.3)

 <= /p>

NO SIDS are locally confi= gured on any routers because the operator has chosen to use SRMS as a globa= l provisioning tool.

Therefore none of the pre= fix reachability advertisements include a SID.

 <= /p>

SRMS (say advertised by s= ome node “F” ) advertises the following:

 <= /p>

1.1.1.1/32 100 range 3

SRMS advertisements do no= t support P/E flags.

 <= /p>

When G forwards the follo= wing packets it has to make a decision as to whether to do PHP, UHP, EXPLIC= IT_NULL:

 <= /p>

1.1.1.1 = ;   to A

1.1.1.2 = ;   to B

1.1.1.3 = ;   to C

 <= /p>

But there is no advertise= ment of P/E for any of the destinations. It must follow a default behavior.=

 <= /p>

If you think there is a p= roblem here, please clearly state what it is and what you think should be d= one about it.

 <= /p>

But whatever you think it= might be, this has nothing to do with SID conflict resolution – whic= h is defining a way to resolve advertised Prefix Conflicts/SID Conflicts as defined in Section 3.2 of the draft.

 <= /p>

   Les

 <= /p>

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:shraddha@juniper.net= ]
Sent: Thursday, May 04, 2017 10:02 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 <= /p>

The issues we are discuss= ing here are specific to Segment Routing and SPRING is the right=

WG to address this. The p= roblem here is not about standardizing what is the default

PHP behavior, it is about= the scenarios when this default behavior assumption need to be applied.

 <= /p>

The problem doesn’t= get solved by applying default PHP behavior in all cases.

Assume 1.1.1.1 in the exa= mple below is a redistributed prefix from another ISIS Level. In that<= /o:p>

case  the pop and fo= rward will cause the service labels to get exposed at A which

would cause black-holing = or misrouting.

 <= /p>

These are issues caused b= y config errors and IMO conflict resolution draft is the right place

to describe these cases a= nd the solutions so that all vendors have consistent behaviours.=

 <= /p>

 <= /p>

Rgds

Shraddha

 <= /p>

From: Les Gi= nsberg (ginsberg) [mailto:ginsberg@ci= sco.com]
Sent: Friday, May 5, 2017 12:05 AM
To: Shraddha Hegde <shrad= dha@juniper.net>; draft-iet= f-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 <= /p>

First, there is no SID co= nflict here. There is therefore nothing for the conflict resolution draft t= o discuss.

 <= /p>

Let’s look at your = scenario more detail. To do so let’s use the following simple topolog= y:

 <= /p>

 <= /p>

    &= nbsp;  --------------A

  /<= /span>

G-----------------B<= /o:p>

  \

     = ----------------C

 <= /p>

Using your example w addi= tion of P/E flag settings in prefix-sid advertisement (using IS-IS naming c= onvention).

For simplicity assume all= nodes have the default SRGB (16000 – 23999).

 <= /p>

1.prefix 1.1.1.1 advertis= ed from node A with no SID

2.Prefix 1.1.1.1 advertis= ed from node B with SID 10  P flag =3D 0 E flag =3D 0

3. Prefix 1.1.1.1 adverti= sed from node C with SID 10 P flag =3D 1  E flag =3D 0

 <= /p>

Using procedures defined = in draft-ietf-spring-conflict-resolution all nodes in the network will use = SID 10 when forwarding traffic to 1.1.1.1. The question is what should the penultimate next hop router do when forwarding a packet= to each of the owning nodes?

 <= /p>

When G forwards the packe= t to B, PHP is indicated, so G will POP.

When G forwards the packe= t to C, UHP is indicated and E flag is 0, so G will send the packet with ou= tgoing label 16010.

 <= /p>

When G forwards the packe= t to A, because A has not advertised the prefix-SID (but is SR capable) we = do not know whether it wants PHP or not – so we have to make an assumption.

Default MPLS behavior is = to assume PHP.

If A does not want PHP th= en it would have to advertise the prefix SID so it could specify desired be= havior using P/E flags.

 <= /p>

Note that this same situa= tion can occur if the mapping server is used as a global provisioning tool.= In such a case no prefix-SIDs need be advertised in prefix reachability advertisements – all SIDs are advertised by SRMS advert= isements which do not include P/E flags.

 <= /p>

Historically,  MPLS = implementations have chosen a default behavior (equivalent to P and E flags= =3D 0). Some implementations provide knobs to override this behavior.=

 <= /p>

If your concern is that t= here is not an explicit definition of default PHP/Explicit NULL behavior, t= hen I think this needs to be directed at the MPLS WG. I do not claim to be an MPLS expert, but I have found these references:=

 <= /p>

RFC 3036 Section 6

 <= /p>

“-  Section 2.= 16 of the MPLS architecture [RFC3031] requires that

    &= nbsp;    the initial label distribution protocol negotiation= between

    &= nbsp;    peer LSRs enable each LSR to determine whether its = peer is

    &= nbsp;    capable of popping the label stack.  This vers= ion of LDP

    &= nbsp;    assumes that LSRs support label popping for all lin= k types

    &= nbsp;    except ATM and Frame Relay.  A future version = may specify means

    &= nbsp;    to make this determination part of the session init= iation

    &= nbsp;    negotiation.”

 <= /p>

   Les

 <= /p>

From: Shraddha= Hegde [mailto:s= hraddha@juniper.net]
Sent: Wednesday, May 03, 2017 10:16 PM
To: Les Ginsberg (ginsberg); draft-ietf-spring-conflict-re= solution@ietf.org
Cc: spring@iet= f.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Les,

 <= /p>

From what you describe in= section 3.3.8, all the SIDs attached to prefixes are fed into the database= .

The example I am talking = about,

 <= /p>

1.prefix 1.1.1.1 advertis= ed from node A with no SID

2.Prefix 1.1.1.1 advertis= ed from node B with SID 10

3. Prefix 1.1.1.1 adverti= sed from node C with SID 10

 <= /p>

The advertisements 2 and = 3 are fed into the mapping database and 1 isn’t.

 <= /p>

The conflict resolution d= oes not detect any conflict with the above advertisements and

For prefix 1.1.1.1 /SID 1= 0 is chosen.

All this is fine but the = problem is in programming the forwarding plane.

 <= /p>

Lets say for a certain no= de E in the network node A is the nexthop for 1.1.1.1.

How would node E program = its forwarding plane?

 <= /p>

Node E should recognize t= he conflict between node A, Node B and C and program the<= /p>

SID 10 with a pop and for= ward instead of looking into the P and E flags of the SID 10?

 <= /p>

This is good enough detai= l, that should be explained in the draft instead of leaving it to the<= /o:p>

Imagination of implemente= rs.

 <= /p>

Rgds

Shraddha

 <= /p>

 <= /p>

 <= /p>

 <= /p>

From: Les Gi= nsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 3, 2017 11:47 PM
To: Shraddha Hegde <shraddha@juniper.net>; draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ie= tf.org
Subject: RE: Mail regarding draft-ietf-spring-conflict-resolution

 

Shraddha –

 <= /p>

There is a misunderstandi= ng on your part. It would be good if you read Section 3.3.8.  Guarante= eing Database Consistency again.

 <= /p>

In short, it does not mat= ter whether you do or do not advertise a prefix SID for a prefix which you = own. What matters is that all routers populate the mapping entry database consistent w Section 3.3.8 and that each router applies the= conflict resolution rules in a consistent manner. Then all routers will be= using the same prefix/SID pair in forwarding.

 <= /p>

   Les

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:s= hraddha@juniper.net]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org<= /a>
Cc: spring@iet= f.org
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addr= esses assigned to different nodes and one or more nodes

do not advertise a Prefix SID for that = anycast address but other nodes advertise a prefix-sid, there is a possibil= ity

of different implementations behaving d= ifferently with respect to programming the labelled routes.

 

This scenario should be considered as a= prefix conflict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with = the relevant text to describe the behavior.

 

 

Rgds

Shraddha

 

--_000_317690a321234127b95bb6e0f145a2a0XCHALN001ciscocom_-- From nobody Mon May 8 20:16:13 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2F2E11294C4; Mon, 8 May 2017 20:16:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.221 X-Spam-Level: X-Spam-Status: No, score=-4.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L52N0Pvtd_90; Mon, 8 May 2017 20:16:09 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D316D129353; Mon, 8 May 2017 20:16:07 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml704-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DGF77445; Tue, 09 May 2017 03:16:06 +0000 (GMT) Received: from NKGEML413-HUB.china.huawei.com (10.98.56.74) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.301.0; Tue, 9 May 2017 04:16:05 +0100 Received: from NKGEML515-MBS.china.huawei.com ([169.254.5.200]) by NKGEML413-HUB.china.huawei.com ([10.98.56.74]) with mapi id 14.03.0235.001; Tue, 9 May 2017 11:16:02 +0800 From: Xuxiaohu To: Robert Raszuk , Stewart Bryant CC: "spring@ietf.org" , IETF Discussion , "gen-art@ietf.org" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , stefano previdi , "Alvaro Retana (aretana)" Thread-Topic: [spring] Genart last call review of draft-ietf-spring-ipv6-use-cases-10 Thread-Index: AQHSxRPsHUHPb/nrU0uQtoD7Jn0ZhaHk+kkAgAAFI4CAAAHWgIAEtpcAgAAgtoCAAX0ogA== Date: Tue, 9 May 2017 03:16:01 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB9C502@NKGEML515-MBS.china.huawei.com> References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> <28cabccc-5426-9938-e2bf-169de0959ddc@gmail.com> In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: multipart/alternative; boundary="_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB9C502NKGEML515MBSchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.59113476.00B3, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.5.200, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 1a5edad125ecfd25b5f3fcb2f52b822b Archived-At: Subject: [spring] =?utf-8?b?562U5aSNOiAgR2VuYXJ0IGxhc3QgY2FsbCByZXZpZXcg?= =?utf-8?q?of_draft-ietf-spring-ipv6-use-cases-10?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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boundary=001a113ccb38b506f3054f0f0318 Archived-At: Subject: [spring] Fwd: New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 May 2017 03:33:12 -0000 --001a113ccb38b506f3054f0f0318 Content-Type: text/plain; charset=UTF-8 Dear All, perhaps this new draft may is of interest to you. Your comments, suggestions are most welcome and greatly appreciated. Regards, Greg ---------- Forwarded message ---------- From: Date: Mon, May 8, 2017 at 8:29 PM Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt To: Gregory Mirsky A new version of I-D, draft-mirsky-spring-bfd-00.txt has been successfully submitted by Greg Mirsky and posted to the IETF repository. Name: draft-mirsky-spring-bfd Revision: 00 Title: Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane Document date: 2017-05-08 Group: Individual Submission Pages: 7 URL: https://www.ietf.org/internet-drafts/draft-mirsky-spring-bfd -00.txt Status: https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ Htmlized: https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 Htmlized: https://datatracker.ietf.org/doc/html/draft-mirsky-spring-b fd-00 Abstract: Segment Routing architecture leverages the paradigm of source routing. It can be realized in the Multiprotocol Label Switching (MPLS) network without any change to the data plane. A segment is encoded as an MPLS label and an ordered list of segments is encoded as a stack of labels. Bidirectional Forwarding Detection (BFD) is expected to monitor any kind of paths between systems. This document defines how to use Label Switched Path Ping to bootstrap and control path in reverse direction of a BFD session on the Segment Routing network over MPLS dataplane. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat --001a113ccb38b506f3054f0f0318 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Dear All,
perhaps this new draft may is of interest to= you.
Your comments, suggestions are most welcome and greatly app= reciated.

Regards,
Greg

---------- Forwarded message ----------
From: <= b class=3D"gmail_sendername"> <internet-drafts@ietf.org>=
Date: Mon, May 8, 2017 at 8:29 PM
Subject: New Version Notifi= cation for draft-mirsky-spring-bfd-00.txt
To: Gregory Mirsky <gregimirsky@gmail.com>



A new version of I-D, draft-mirsky-spring-bfd-00.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mirsky-spring-bfd
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bidirectional Forwarding Detection= (BFD) in Segment Routing Networks Using MPLS Dataplane
Document date:=C2=A0 2017-05-08
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draft-mirsky-spring-= bfd-00.txt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ht= tps://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://to= ols.ietf.org/html/draft-mirsky-spring-bfd-00
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0= https://datatracker.ietf.org/doc/html/draft-mirsky-spring-bfd-00<= /a>


Abstract:
=C2=A0 =C2=A0Segment Routing architecture leverages the paradigm of source<= br> =C2=A0 =C2=A0routing.=C2=A0 It can be realized in the Multiprotocol Label S= witching
=C2=A0 =C2=A0(MPLS) network without any change to the data plane.=C2=A0 A s= egment is
=C2=A0 =C2=A0encoded as an MPLS label and an ordered list of segments is en= coded
=C2=A0 =C2=A0as a stack of labels.=C2=A0 Bidirectional Forwarding Detection= (BFD) is
=C2=A0 =C2=A0expected to monitor any kind of paths between systems.=C2=A0 T= his document
=C2=A0 =C2=A0defines how to use Label Switched Path Ping to bootstrap and c= ontrol
=C2=A0 =C2=A0path in reverse direction of a BFD session on the Segment Rout= ing
=C2=A0 =C2=A0network over MPLS dataplane.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


--001a113ccb38b506f3054f0f0318-- From nobody Mon May 8 21:21:15 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6E944120227; Mon, 8 May 2017 21:21:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.399 X-Spam-Level: X-Spam-Status: No, score=-2.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.199, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LzIqy9nAus6E; Mon, 8 May 2017 21:21:05 -0700 (PDT) Received: from mail-io0-x231.google.com (mail-io0-x231.google.com [IPv6:2607:f8b0:4001:c06::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E84DA129AB2; Mon, 8 May 2017 21:20:56 -0700 (PDT) Received: by mail-io0-x231.google.com with SMTP id k91so63031769ioi.1; Mon, 08 May 2017 21:20:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=njPnFQctFH4WXmNQUG7xNWkbk+K19hDrbu9y/KNTig8=; b=vWm3hgiGum52dAVoRljBoc5PIGsY/66babkWMGqS71Y4HD3sue84gJrsvq+5Q5aKXS 9nPXrLey3NBGM+1oK1JXf0e4Jhm5Vc7TU16es8JCiTOKBgu2LLATy0r9qy3yqOnkSUpb 0+NTFzVd0p6vfvgKcrim3GMacBa53jQUrB7wIi6p5Se5rWo+WgTimGXj9OEW5un1Soxi hxyQLp08tPoiF9fMxWnBxMgoi0JRoG1B+P662umTXSBMw2nZPzXEP5bzRNlMhBXl+Yp6 3R6rPd+Y/hFRHopLpCa7OTX3/1PnWHzxSOo4gFNayInl3SdrPEK1gkMd6rC+t97A/ere a+SQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=njPnFQctFH4WXmNQUG7xNWkbk+K19hDrbu9y/KNTig8=; b=H9xTxIqrYD+1qDByUjv8xol9DqZEQdKyXtzrehM6KmixlFlw9gpgfA8bwbX3VOHDTs nb4ROut580eyRUa1uGNDVdo14bBE0ow4Bvd6OaMUM2ggAIag5sEbaXX8iAd1EFOZ4Xwn TYNPxWjZEc7+Id43wwio3spsCHE+IJ+CLpoLoqEg5qX6G7jN3khiX3aUjWnEMIHs8wYA IpVJsFWsmAyqJaYZ/JWPNdczzuv9wcgOitKTPiBej6/QsfVh1qJmvyh0BCVGiPflSkKS CGi9WQz+EWF60KSLhYght5XDGT+mU6ILKTgkavUwWkAo8e14op5RAHAdkHPKbJf/6ssX YeOw== X-Gm-Message-State: AN3rC/6VqMdqp1c8MmvyabCr2qYXoUoJCsWm6h5CaLNM7oPZ7I40+/C3 ZZgaK+nL1oC6WMfcJ5l1tLY6Gm47bg== X-Received: by 10.107.189.198 with SMTP id n189mr60124928iof.179.1494303656302; Mon, 08 May 2017 21:20:56 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.79.62.24 with HTTP; Mon, 8 May 2017 21:20:55 -0700 (PDT) Received: by 10.79.62.24 with HTTP; Mon, 8 May 2017 21:20:55 -0700 (PDT) In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB9C502@NKGEML515-MBS.china.huawei.com> References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> <28cabccc-5426-9938-e2bf-169de0959ddc@gmail.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB9C502@NKGEML515-MBS.china.huawei.com> From: Robert Raszuk Date: Tue, 9 May 2017 06:20:55 +0200 X-Google-Sender-Auth: 0YcMhw_1G9X72BWL3kXVgdFIMz0 Message-ID: To: Xuxiaohu Cc: stefano previdi , Stewart Bryant , "Alvaro Retana (aretana)" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "gen-art@ietf.org" , IETF Discussion , "spring@ietf.org" Content-Type: multipart/alternative; boundary=94eb2c0c85e49ee560054f0faeb2 Archived-At: Subject: Re: [spring] =?utf-8?b?562U5aSNOiBHZW5hcnQgbGFzdCBjYWxsIHJldmlldyBv?= =?utf-8?q?f_draft-ietf-spring-ipv6-use-cases-10?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 May 2017 04:21:07 -0000 --94eb2c0c85e49ee560054f0faeb2 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi, Can you point me to any SRv6 document mandating that such mapping MUST be done in a routing protocol ? Thx, R. On May 9, 2017 05:16, "Xuxiaohu" wrote: Hi Robert, Except the function indicated by all zeros, it does require mappings between functions, function indications and locators. Take tenant network function as an exampleJ Best regards, Xiaohu *=E5=8F=91=E4=BB=B6=E4=BA=BA:* spring [mailto:spring-bounces@ietf.org] *=E4= =BB=A3=E8=A1=A8 *Robert Raszuk *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2017=E5=B9=B45=E6=9C=888=E6=97=A5 2= 0:13 *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Stewart Bryant *=E6=8A=84=E9=80=81:* spring@ietf.org; IETF Discussion; gen-art@ietf.org; draft-ietf-spring-ipv6-use-cases.all@ietf.org; stefano previdi; Alvaro Retana (aretana) *=E4=B8=BB=E9=A2=98:* Re: [spring] Genart last call review of draft-ietf-sp= ring-ipv6-use- cases-10 Hi Stewart, > =E2=80=8B Yes, but those are required anyway to support SRv6 That is incorrect. Please watch Les's presentation during last IETF where he clearly and correctly stated that IGP extensions for SRv6 are optional and not required (unlike in the case of SR-MPLS where such signalling of global labels is indeed necessary to build "global labels" based forwarding). As a matter of fact I knew this will generate confusion in IETF and recommended to make it very clear in the drafts. Distribution of SID functions does not need to be carried in routing protocols. And SRv6 SID locator function is native to IPv6 routing hence no extensions needed. Sure they can be carried in IGPs or BGP but this is just an option not necessity. Best, Robert. On Mon, May 8, 2017 at 12:15 PM, Stewart Bryant wrote: On 05/05/2017 11:17, Robert Raszuk wrote: And to add one observation .. Stewart makes a point that SR-MPLS can be deployed without mpls control plane. Well it sure does not require LDP however IGP or BGP extensions for SR-MPLS signalling is also an example of mpls control plane ... even if much simpler than traditional cases it is still required. =E2=80=8B=E2=80=8B Yes, but those are required anyway to support SRv6. You always have to provide the mapping between the function, the function identifier and the function location. - Stewart _______________________________________________ spring mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring --94eb2c0c85e49ee560054f0faeb2 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi,

Can= you point me to any SRv6 document mandating that such mapping MUST be done= in a routing protocol ?

Thx,
R.


On May 9, 2017 05:16, "Xuxiaohu" <xuxiaohu@huawei.com> wrote:

Hi Robert,=

=C2= =A0

Except the= function indicated by all zeros, it does require mappings between function= s, function indications and locators. Take tenant network function as an exampleJ

=C2= =A0

Best regar= ds,

Xiaohu<= /u>

=C2= =A0

=E5=8F=91=E4=BB= =B6=E4=BA=BA: spring [mailto:spring-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Robert Raszuk
=E5=8F=91=E9=80=81=E6=97=B6=E9= =97=B4: 2017=E5=B9=B45=E6=9C=888=E6=97=A5<= span lang=3D"EN-US"> 20:13
=E6=94=B6=E4=BB=B6=E4=BA=BA: Stewart Bryant
=E6=8A=84=E9=80=81: spring@ietf.or= g; IETF Discussion; gen-art@ietf.org; draft-ietf-spring-ipv6-use-cases.all@= ietf.org; stefano previdi; Alvaro Retana (aretana)
=E4=B8=BB=E9=A2=98: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-= cases-10

=C2=A0

=C2=A0

Hi Stewart,

=C2=A0

> =E2=80=8B

Yes, but those are required anyway to suppo= rt SRv6

=C2=A0

That is incorrect.=C2=A0

=C2=A0

Please watch Les's presentation during = last IETF where he clearly and correctly stated that IGP extensions for SRv= 6 are optional and not required (unlike in the case of SR-MPLS where such signalling of global labels is indeed necessary to build "= global labels" based forwarding).=C2=A0

=C2=A0

As a matter of fact I knew this will genera= te confusion in IETF and recommended to make it very clear in the drafts. D= istribution of SID functions does not need to be carried in routing protocols. And SRv6 SID locator function is native to IPv6 routing= hence no extensions needed. Sure they can be carried in IGPs or BGP but th= is is just an option not necessity.=C2=A0

=C2=A0

Best,

Robert.

=C2=A0

=C2=A0

=C2=A0

On Mon, May 8, 2017 at 12:15 PM= , Stewart Bryant <stewart.bryant@gmail.com> wrote:



On 05/05/2017 11:17, Robert Ra= szuk wrote:

And to add one observation ..
Stewart makes a point that SR-MPLS can be deployed without mpls control pla= ne.

Well it sure does not require LDP however IGP or BGP extensions for SR-MPLS= signalling is also an example of mpls control plane ... even if much simpl= er than traditional cases it is still required.

=C2=A0

=E2=80=8B=E2=80=8B

= Yes, but those are required anyway to support SRv6. You always have to prov= ide the mapping between the function, the function identifier and the funct= ion location.

- Stewart<= u>

=C2=A0


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--94eb2c0c85e49ee560054f0faeb2-- From nobody Mon May 8 22:06:58 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D1B9127B52; Mon, 8 May 2017 22:06:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.221 X-Spam-Level: X-Spam-Status: No, score=-4.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sWPfQSISok_O; Mon, 8 May 2017 22:06:53 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F23712778E; Mon, 8 May 2017 22:06:52 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml705-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DGF88022; Tue, 09 May 2017 05:06:50 +0000 (GMT) Received: from NKGEML412-HUB.china.huawei.com (10.98.56.73) by lhreml705-cah.china.huawei.com (10.201.108.46) with Microsoft SMTP Server (TLS) id 14.3.301.0; Tue, 9 May 2017 06:06:48 +0100 Received: from NKGEML515-MBS.china.huawei.com ([169.254.5.200]) by nkgeml412-hub.china.huawei.com ([10.98.56.73]) with mapi id 14.03.0235.001; Tue, 9 May 2017 13:06:42 +0800 From: Xuxiaohu To: Robert Raszuk CC: stefano previdi , Stewart Bryant , "Alvaro Retana (aretana)" , "draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "gen-art@ietf.org" , IETF Discussion , "spring@ietf.org" Thread-Topic: =?utf-8?B?W3NwcmluZ10g562U5aSNOiBHZW5hcnQgbGFzdCBjYWxsIHJldmlldyBvZiBk?= =?utf-8?Q?raft-ietf-spring-ipv6-use-cases-10?= Thread-Index: AQHSyHurFkSx//gff0esdxW+rJXFe6HrcNwg Date: Tue, 9 May 2017 05:06:42 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB9C58E@NKGEML515-MBS.china.huawei.com> References: <149374426742.21414.16408814015665498739@ietfa.amsl.com> <3E209B45-90CE-4EEB-9D2B-E14EFE28DCE0@cisco.com> <87a1534f-079d-3707-9f5d-9327e831bf7a@gmail.com> <28cabccc-5426-9938-e2bf-169de0959ddc@gmail.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB9C502@NKGEML515-MBS.china.huawei.com> In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: multipart/alternative; boundary="_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB9C58ENKGEML515MBSchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090201.59114E6A.00CA, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.5.200, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 21030fa153099750610f973086d9c908 Archived-At: Subject: [spring] =?utf-8?b?562U5aSNOiAg562U5aSNOiBHZW5hcnQgbGFzdCBjYWxs?= =?utf-8?q?_review_of_draft-ietf-spring-ipv6-use-cases-10?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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"draft-ietf-spring-ipv6-use-cases.all@ietf.org" , "gen-art@ietf.org" , IETF Discussion , "spring@ietf.org" Content-Type: multipart/alternative; boundary=001a114043b087ec9c054f1119e3 Archived-At: Subject: Re: [spring] =?utf-8?b?562U5aSNOiAg562U5aSNOiBHZW5hcnQgbGFzdCBjYWxs?= =?utf-8?q?_review_of_draft-ietf-spring-ipv6-use-cases-10?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 May 2017 06:02:28 -0000 --001a114043b087ec9c054f1119e3 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Xiaohu, Mapping can be also well known .. for example from the RFC clearly defining the functions. That clearly removes the need of *any* control plane to dynamically carry the values. Cheers, R. On Tue, May 9, 2017 at 7:06 AM, Xuxiaohu wrote: > Nobody said that such mapping must be distributed in a routing protocolJ > We just said that such mapping is always required no matter we use an MPL= S > label as function instruction or using the latter part of an IPv6 address > as function instruction. > > > > Best regards, > > Xiaohu > > > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA:* rraszuk@gmail.com [mailto:rraszuk@gmail.co= m] *=E4=BB=A3=E8=A1=A8 *Robert Raszuk > *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2017=E5=B9=B45=E6=9C=889=E6=97=A5= 12:21 > *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Xuxiaohu > *=E6=8A=84=E9=80=81:* stefano previdi; Stewart Bryant; Alvaro Retana (are= tana); > draft-ietf-spring-ipv6-use-cases.all@ietf.org; gen-art@ietf.org; IETF > Discussion; spring@ietf.org > *=E4=B8=BB=E9=A2=98:* Re: [spring] =E7=AD=94=E5=A4=8D: Genart last call r= eview of > draft-ietf-spring-ipv6-use-cases-10 > > > > Hi, > > > > Can you point me to any SRv6 document mandating that such mapping MUST be > done in a routing protocol ? > > > > Thx, > > R. > > > > > > On May 9, 2017 05:16, "Xuxiaohu" wrote: > > Hi Robert, > > > > Except the function indicated by all zeros, it does require mappings > between functions, function indications and locators. Take tenant network > function as an exampleJ > > > > Best regards, > > Xiaohu > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA:* spring [mailto:spring-bounces@ietf.org] *= =E4=BB=A3=E8=A1=A8 *Robert Raszuk > *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2017=E5=B9=B45=E6=9C=888=E6=97=A5= 20:13 > *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Stewart Bryant > *=E6=8A=84=E9=80=81:* spring@ietf.org; IETF Discussion; gen-art@ietf.org; > draft-ietf-spring-ipv6-use-cases.all@ietf.org; stefano previdi; Alvaro > Retana (aretana) > *=E4=B8=BB=E9=A2=98:* Re: [spring] Genart last call review of draft-ietf-= spring-ipv6-use- > cases-10 > > > > > > Hi Stewart, > > > > > =E2=80=8B > > Yes, but those are required anyway to support SRv6 > > > > That is incorrect. > > > > Please watch Les's presentation during last IETF where he clearly and > correctly stated that IGP extensions for SRv6 are optional and not requir= ed > (unlike in the case of SR-MPLS where such signalling of global labels is > indeed necessary to build "global labels" based forwarding). > > > > As a matter of fact I knew this will generate confusion in IETF and > recommended to make it very clear in the drafts. Distribution of SID > functions does not need to be carried in routing protocols. And SRv6 SID > locator function is native to IPv6 routing hence no extensions needed. Su= re > they can be carried in IGPs or BGP but this is just an option not > necessity. > > > > Best, > > Robert. > > > > > > > > On Mon, May 8, 2017 at 12:15 PM, Stewart Bryant > wrote: > > > > On 05/05/2017 11:17, Robert Raszuk wrote: > > And to add one observation .. > > Stewart makes a point that SR-MPLS can be deployed without mpls control > plane. > > Well it sure does not require LDP however IGP or BGP extensions for > SR-MPLS signalling is also an example of mpls control plane ... even if > much simpler than traditional cases it is still required. > > > > =E2=80=8B=E2=80=8B > > Yes, but those are required anyway to support SRv6. You always have to > provide the mapping between the function, the function identifier and the > function location. > > - Stewart > > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > > --001a114043b087ec9c054f1119e3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Xiaohu,

Mapping can be also well known .. for example from th= e RFC clearly defining the functions. That clearly removes the need of *any= * control plane to dynamically carry the values.=C2=A0

Cheers,
R.

On Tue, May 9, 2017 at 7:06 AM, Xu= xiaohu <xuxiaohu@huawei.com> wrote:

Nobody sai= d that such mapping must be distributed in a routing protocolJ=C2=A0=C2=A0 We just said that such mapping is always required no matter we use an MPLS= label as function instruction or using the latter part of an IPv6 address = as function instruction.

=C2= =A0

Best regar= ds,

Xiaohu<= /u>

=C2= =A0

=C2= =A0

=E5=8F=91=E4=BB= =B6=E4=BA=BA: rraszuk@gmail.com [mailto:rraszuk@gmail.com] =E4=BB=A3=E8=A1=A8 Robert Raszuk
=E5=8F=91=E9=80=81=E6=97=B6=E9= =97=B4: 2017=E5=B9=B45=E6=9C=889=E6=97=A5<= span lang=3D"EN-US"> 12:21
=E6=94=B6=E4=BB=B6=E4=BA=BA: Xuxiaohu
=E6=8A=84=E9=80=81: stefano previdi; Stewart Bryant; Alvaro Retana (aretana); draft-ietf-spring-ipv6-use-cases.all@ietf.org; gen-art@ietf.org; IETF Discussion; = spring@ietf.org =E4=B8=BB=E9=A2=98: Re: [spring] =E7=AD=94=E5=A4=8D: Genart last call review of draft-i= etf-spring-ipv6-use-cases-10

=C2=A0

Hi,

=C2=A0

Can you point me to any SRv6 do= cument mandating that such mapping MUST be done in a routing protocol ?<= /u>

=C2=A0

Thx,

R.

=C2=A0

=C2=A0

On May 9, 2017 05:16, "Xux= iaohu" <xu= xiaohu@huawei.com> wrote:

Hi Robert,=

=C2=A0

Except the= function indicated by all zeros, it does require mappings between function= s, function indications and locators. Take tenant network function as an exam= pleJ

=C2=A0

Best regar= ds,

Xiaohu

=C2=A0

=E5=8F=91=E4=BB= =B6=E4=BA=BA: spring [mailto:spring-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Robert Raszuk
=E5=8F=91=E9=80=81=E6=97=B6=E9= =97=B4: 2017=E5=B9=B45=E6=9C=888=E6=97=A5<= span lang=3D"EN-US"> 20:13
=E6=94=B6=E4=BB=B6=E4=BA=BA: Stewart Bryant
=E6=8A=84=E9=80=81: spring@ietf.org; IETF Discussion; gen-art@ietf.org; draft-ietf-spring-ipv6-use-cases.all@ietf.org; stefano previdi; Al= varo Retana (aretana)
=E4=B8=BB=E9=A2=98: Re: [spring] Genart last call review of draft-ietf-spring-ipv6-use-= cases-10

=C2=A0

=C2=A0

Hi Stewart,<= /u>

=C2=A0

> =E2=80=8B<= u>

Yes, but those are required anyway to suppo= rt SRv6

=C2=A0

That is incorrect.=C2=A0

=C2=A0

Please watch Les's presentation during = last IETF where he clearly and correctly stated that IGP extensions for SRv= 6 are optional and not required (unlike in the case of SR-MPLS where such signal= ling of global labels is indeed necessary to build "global labels"= ; based forwarding).=C2=A0=

=C2=A0

As a matter of fact I knew this will genera= te confusion in IETF and recommended to make it very clear in the drafts. Distribution of SID functions does not need to be carried in routing proto= cols. And SRv6 SID locator function is native to IPv6 routing hence no exte= nsions needed. Sure they can be carried in IGPs or BGP but this is just an = option not necessity.=C2=A0

=C2=A0

Best,=

Robert.<= u>

=C2=A0

=C2=A0

=C2=A0

On Mon, May 8, 2017 at 12:15 PM= , Stewart Bryant <stewart.bryant@gmail.com> wrote:



On 05/05/2= 017 11:17, Robert Raszuk wrote:

And to add one observation ..
Stewart makes a point that SR-MPLS can be deployed without mpls control pla= ne.

Well it sure does not require LDP however IGP or BGP extensions for SR-MPLS= signalling is also an example of mpls control plane ... even if much simpl= er than traditional cases it is still required.

=C2=A0

=E2=80=8B=E2=80=8B

= Yes, but those are required anyway to support SRv6. You always have to prov= ide the mapping between the function, the function identifier and the funct= ion location.

- St= ewart

=C2=A0

=
_______________________________________________
spring mailing list
spring@ietf.org = https://www.ietf.org/mailman/listinfo/spring<= /p>

=C2=A0


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DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ryj0stNX5sp0; Tue, 9 May 2017 09:00:28 -0700 (PDT) Received: from mail-oi0-x231.google.com (mail-oi0-x231.google.com [IPv6:2607:f8b0:4003:c06::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B2C1C12EA42; Tue, 9 May 2017 09:00:23 -0700 (PDT) Received: by mail-oi0-x231.google.com with SMTP id h4so4948772oib.3; Tue, 09 May 2017 09:00:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=LNIPH7txEl3b07ZBRj/kYGT05RcZ1GhC7ydfir+4nVM=; b=E3olA8MDKx2thgOriN2m/fQmanvc5pT1zVW048efx1nWkInSzbaKAZh3/s/HNTL3SS PZ9pLwm7jI6PmZGWIVYexndeiVeFNSuhtDC7s/qqKfQtgzhONijuOheeE+eMkWzLyVWp 6m+UiSAm6NGF+gNfKlsemt/8UA0iqozmorfr7DiYLDctbnyFwtkRZWLRG9socbqni9VE PD9GPYC1xodkWFIaVoyAU7/2Lco+qN/1uL7M289fJgwdXHMBenAQQTtceMLWWmlauEU7 5B3xsLWH7YiICDmvxWERH9ZFw8tVIsDjRfAX8vZrpiKLRn4YvPlsfh8sR3Dv21tD1Nl2 I6rQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=LNIPH7txEl3b07ZBRj/kYGT05RcZ1GhC7ydfir+4nVM=; b=APktbC/fdoRA0PFX13uXt2cBe0l5eGD1I2RYAnlHCRFzDmQDdcW7ccDnT9U4MFnhCy uMTLVxGlw27vhpJK7Yq+DV74tEsMIbTy3+nkHgAUMnkib3l2GmsUbOz4O7HnejuVyAI1 VKVS6Us5+/I05QEBfgDOihxaZX3IwfDp5zB/1qL+PqpkYjmGPwk6qKlSN0+F78D7U5NH yHGEB8vAUTpzyY9EeS6x0LSbL/M4ucZftpXuBuuZMxqLTdC5e7U5Gvg0t2BE7WHlOuwK WBu8dJZor0cf7CRNcpUceqcZ9Npu1Wez1E+PbBfcyYIH9IP7ik73zxTz7gmv3kL8CCNK CsCQ== X-Gm-Message-State: AODbwcBL+3Bql3UWgqb4ocseE/GulkAaGDbdhSDg+tqJrTvtXxNT1F5o OsZkUspBzUbZjL42J2psP4NUSkw7YndM X-Received: by 10.202.206.139 with SMTP id e133mr293393oig.168.1494345623081; Tue, 09 May 2017 09:00:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.52.246 with HTTP; Tue, 9 May 2017 09:00:22 -0700 (PDT) In-Reply-To: <1C12E162-6B5C-4EF2-A3CB-3621C72BCFE9@cisco.com> References: <149430058880.24107.8628199428997673992.idtracker@ietfa.amsl.com> <1C12E162-6B5C-4EF2-A3CB-3621C72BCFE9@cisco.com> From: Greg Mirsky Date: Tue, 9 May 2017 09:00:22 -0700 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: "spring@ietf.org" , "rtg-bfd@ietf.org" , "mpls@ietf.org" Content-Type: multipart/alternative; boundary=001a113d3ccc0918cc054f1974f7 Archived-At: Subject: Re: [spring] [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 May 2017 16:00:31 -0000 --001a113d3ccc0918cc054f1974f7 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Dear Carlos, I've decided to re-start the discussion and am interested to hear technical comments to the proposed solution. Regards, Greg On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Dear Greg, > > Cursorily scanning through this, it seems that most concerns raised and > comments made about the SR sections of draft-ietf-mpls-bfd-directed-0N > (with N < 5) apply to your new draft. > > This is one of those: https://www.ietf.org/mail-archive/web/mpls/current/ > msg15860.html =E2=80=94 the list archive shows a few more. The copy/paste= did not > address the comments. > > Best, > > =E2=80=94 Carlos. > > On May 8, 2017, at 11:33 PM, Greg Mirsky wrote: > > Dear All, > perhaps this new draft may is of interest to you. > Your comments, suggestions are most welcome and greatly appreciated. > > Regards, > Greg > > ---------- Forwarded message ---------- > From: > Date: Mon, May 8, 2017 at 8:29 PM > Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt > To: Gregory Mirsky > > > > A new version of I-D, draft-mirsky-spring-bfd-00.txt > has been successfully submitted by Greg Mirsky and posted to the > IETF repository. > > Name: draft-mirsky-spring-bfd > Revision: 00 > Title: Bidirectional Forwarding Detection (BFD) in Segment > Routing Networks Using MPLS Dataplane > Document date: 2017-05-08 > Group: Individual Submission > Pages: 7 > URL: https://www.ietf.org/internet- > drafts/draft-mirsky-spring-bfd-00.txt > Status: https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ > Htmlized: https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 > Htmlized: https://datatracker.ietf.org/ > doc/html/draft-mirsky-spring-bfd-00 > > > Abstract: > Segment Routing architecture leverages the paradigm of source > routing. It can be realized in the Multiprotocol Label Switching > (MPLS) network without any change to the data plane. A segment is > encoded as an MPLS label and an ordered list of segments is encoded > as a stack of labels. Bidirectional Forwarding Detection (BFD) is > expected to monitor any kind of paths between systems. This document > defines how to use Label Switched Path Ping to bootstrap and control > path in reverse direction of a BFD session on the Segment Routing > network over MPLS dataplane. > > > > > Please note that it may take a couple of minutes from the time of > submission > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > > --001a113d3ccc0918cc054f1974f7 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Dear Carlos,
I've decided to re-start the discussi= on and am interested to hear technical comments to the proposed solution.= =C2=A0

Regards,
Greg

On Tue, May 9, 2017 at 8:= 51 AM, Carlos Pignataro (cpignata) <cpignata@cisco.com> wro= te:
Dear Greg,

Cursorily scanning through this, it seems that most concerns raised an= d comments made about the SR sections of=C2=A0draft-ietf-mpls-bfd-dire= cted-0N (with N < 5) apply to your new draft.

This is one of those:=C2=A0https://www.ietf.org/mail-archive/web/mpls/current/msg15860.html =E2=80=94 the list = archive shows a few more. The copy/paste did not address the comments.

Best,

=E2=80=94 Carlos.

On May 8, 2017, at 11:33 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear All,
perhaps this new draft may is of interest to you.
Your comments, suggestions are most welcome and greatly appreciated.

Regards,
Greg

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Mon, May 8, 2017 at 8:29 PM
Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt
To: Gregory Mirsky <gregimirsky@gmail.com>



A new version of I-D, draft-mirsky-spring-bfd-00.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mirsky-spring-bfd
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bidirectional Forwarding Detection= (BFD) in Segment Routing Networks Using MPLS Dataplane
Document date:=C2=A0 2017-05-08
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draft-mirsky-spring-bfd-00.t= xt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ht= tps://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://to= ols.ietf.org/html/draft-mirsky-spring-bfd-00
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0= https://datatracker.ietf.org/doc/html/draft-mirsky-spring-bfd-00<= /a>


Abstract:
=C2=A0 =C2=A0Segment Routing architecture leverages the paradigm of source<= br> =C2=A0 =C2=A0routing.=C2=A0 It can be realized in the Multiprotocol Label S= witching
=C2=A0 =C2=A0(MPLS) network without any change to the data plane.=C2=A0 A s= egment is
=C2=A0 =C2=A0encoded as an MPLS label and an ordered list of segments is en= coded
=C2=A0 =C2=A0as a stack of labels.=C2=A0 Bidirectional Forwarding Detection= (BFD) is
=C2=A0 =C2=A0expected to monitor any kind of paths between systems.=C2=A0 T= his document
=C2=A0 =C2=A0defines how to use Label Switched Path Ping to bootstrap and c= ontrol
=C2=A0 =C2=A0path in reverse direction of a BFD session on the Segment Rout= ing
=C2=A0 =C2=A0network over MPLS dataplane.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls


--001a113d3ccc0918cc054f1974f7-- From nobody Tue May 9 09:07:34 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 47FCC1294AC; Tue, 9 May 2017 09:07:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YFdLccWn6s2N; Tue, 9 May 2017 09:07:25 -0700 (PDT) Received: from rcdn-iport-3.cisco.com (rcdn-iport-3.cisco.com [173.37.86.74]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2E92212420B; Tue, 9 May 2017 09:07:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=15804; q=dns/txt; s=iport; t=1494346045; x=1495555645; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=z4kC/A4y1mfoT95b1XbYLX+H3rYIWFJpJ288HrXZ1QM=; b=gblv3Wg+qL95b0gVGi6OEQ2k2q6WmNFQyK9rW5+z3OXx23MYo4KWKg4I ZZorJmebo6pIqqqUFHMFA5ZFvjmxzfeK/igdCIgmNyJGPX4MYo9bb9V4b nBQgYXGyH3GG+Ks5pm5AzR0ep1x4RevNHS+WSUmarwAxZ1KAsq4Ua2Dx3 g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0D4AACA6BFZ/4cNJK1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1VigQwHg2KKGJFWiCOIF4U4gg8hAQqFeAIahFI/GAECAQEBAQE?= =?us-ascii?q?BAWsohRUBAQEBAwEBIUsJAhACAQgRAQIBAigDAgICHwYLFAMGCAIEDgUbiW4DF?= =?us-ascii?q?Q6yVoImhy4NgzgBAQEBAQEBAQEBAQEBAQEBAQEBAQEdhl+BXiuCcIJUTYElAQE?= =?us-ascii?q?7FgiCTC6CMQWJRIZehkuGXTsBhxuHKoRTggRVhGaKLIsqhHcog3YBDxA4gQpwF?= =?us-ascii?q?RwqEgGEKDkcgWN2AYZFgSGBDQEBAQ?= X-IronPort-AV: E=Sophos;i="5.38,315,1491264000"; d="scan'208,217";a="232756573" Received: from alln-core-2.cisco.com ([173.36.13.135]) by rcdn-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 09 May 2017 16:07:23 +0000 Received: from XCH-RTP-016.cisco.com (xch-rtp-016.cisco.com [64.101.220.156]) by alln-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id v49G7NWB019458 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Tue, 9 May 2017 16:07:23 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-016.cisco.com (64.101.220.156) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 9 May 2017 12:07:22 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Tue, 9 May 2017 12:07:22 -0400 From: "Carlos Pignataro (cpignata)" To: Greg Mirsky CC: "spring@ietf.org" , "rtg-bfd@ietf.org" , "mpls@ietf.org" Thread-Topic: [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt Thread-Index: AQHSyNwl4f82jzKO5Eq8Ccd1kzJOwKHsbA8AgAAB9QA= Date: Tue, 9 May 2017 16:07:22 +0000 Message-ID: References: <149430058880.24107.8628199428997673992.idtracker@ietfa.amsl.com> <1C12E162-6B5C-4EF2-A3CB-3621C72BCFE9@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.117.115.52] Content-Type: multipart/alternative; boundary="_000_F3C093E0FE4E41C0B9EB0CA1CB52DBE7ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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mail-oi0-x22d.google.com with SMTP id l18so12511189oig.2; Tue, 09 May 2017 12:43:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=HfyriXuk6qw3zG8RgGrsFjfIh4fDS3nL7fTX9iZc1Sw=; b=X+Syb4gHHVzNyfs4UZWIX7jx0oajICpwjq80hQHnIAsQcaEtLIy7p1L8bffnv3OqTO xfgwIGIS6rBtNRVlw/+vcVfmYNWPuaYqzgy6nnsoGjEcYunPhVkZCIDx8CEblpGuaN4G IZd4n4k0h8EMhKG9DBBjfgG7s2E/PgHHjicWvvib6suUrJ2w7t+/OnyhAs62OSniFjzv MriMpqdu2f/WHRT2cizbEWyUrqabiv5kbheTWmSCYeuwqRxb5c7eTHMJMh9YoGlKIJ8B A2VxKn3TtIlb00pvJA6ZLuXAzItODp45/CBMSMjLRyYU+w/LVNLXwnPprlRMFrNHx2Pc KDsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=HfyriXuk6qw3zG8RgGrsFjfIh4fDS3nL7fTX9iZc1Sw=; b=lotx8monuhdUj0vmICRQjW0r3Lufrzc3da1K5+i+2rE0soohl1PEVerHZ4iIOk9Aol 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Re: [spring] [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 May 2017 19:43:58 -0000 --001a1134fbb470c137054f1c9329 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Carlos, I probably would characterize anything that starts with Why not as a technical comment but rather as a question. According to draft-ietf-spring-segment-routing-mpls, "In the MPLS dataplane= ,the SR header is instantiated through a label stack". At the same time, one of advantages of SR is that "per-flow state only [maintained] at the ingress node to the SR domain". Thus, for the case of monitoring unidirectional SR tunnels, I consider that there's no need to create any additional state on the egress node. Of course, if there were bidirectional SR tunnels, then control of the reverse direction of the BFD session would not require use of the Return Path sub-TLV. As for LSP-Ping, I just propose that the Segment Routing MPLS Tunnel sub-TLV MAY be used Reply Path TLV defined in RFC 7110. I viewed the proposal as invitation to technical discussion. Regards, Greg On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Thank you Greg! > > Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems quite > similar to the text removed at https://tools.ietf.org/ > rfcdiff?url2=3Ddraft-ietf-mpls-bfd-directed-05.txt, then the complete set > of outstanding technical comments that triggered the removal of that text > from draft-ietf-mpls-bfd-directed-05.txt might peek your interest :-) > > One that I recall is: why use label values when every other return-path > sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directed, > uses TFSs? > > Best, > > =E2=80=94 Carlos. > > On May 9, 2017, at 12:00 PM, Greg Mirsky wrote: > > Dear Carlos, > I've decided to re-start the discussion and am interested to hear > technical comments to the proposed solution. > > Regards, > Greg > > On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > >> Dear Greg, >> >> Cursorily scanning through this, it seems that most concerns raised and >> comments made about the SR sections of draft-ietf-mpls-bfd-directed-0N >> (with N < 5) apply to your new draft. >> >> This is one of those: https://www.ietf.org/ma >> il-archive/web/mpls/current/msg15860.html =E2=80=94 the list archive sho= ws a few >> more. The copy/paste did not address the comments. >> >> Best, >> >> =E2=80=94 Carlos. >> >> On May 8, 2017, at 11:33 PM, Greg Mirsky wrote: >> >> Dear All, >> perhaps this new draft may is of interest to you. >> Your comments, suggestions are most welcome and greatly appreciated. >> >> Regards, >> Greg >> >> ---------- Forwarded message ---------- >> From: >> Date: Mon, May 8, 2017 at 8:29 PM >> Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt >> To: Gregory Mirsky >> >> >> >> A new version of I-D, draft-mirsky-spring-bfd-00.txt >> has been successfully submitted by Greg Mirsky and posted to the >> IETF repository. >> >> Name: draft-mirsky-spring-bfd >> Revision: 00 >> Title: Bidirectional Forwarding Detection (BFD) in Segment >> Routing Networks Using MPLS Dataplane >> Document date: 2017-05-08 >> Group: Individual Submission >> Pages: 7 >> URL: https://www.ietf.org/internet- >> drafts/draft-mirsky-spring-bfd-00.txt >> Status: https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd= / >> Htmlized: https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 >> Htmlized: https://datatracker.ietf.org/ >> doc/html/draft-mirsky-spring-bfd-00 >> >> >> Abstract: >> Segment Routing architecture leverages the paradigm of source >> routing. It can be realized in the Multiprotocol Label Switching >> (MPLS) network without any change to the data plane. A segment is >> encoded as an MPLS label and an ordered list of segments is encoded >> as a stack of labels. Bidirectional Forwarding Detection (BFD) is >> expected to monitor any kind of paths between systems. This document >> defines how to use Label Switched Path Ping to bootstrap and control >> path in reverse direction of a BFD session on the Segment Routing >> network over MPLS dataplane. >> >> >> >> >> Please note that it may take a couple of minutes from the time of >> submission >> until the htmlized version and diff are available at tools.ietf.org. >> >> The IETF Secretariat >> >> >> _______________________________________________ >> mpls mailing list >> mpls@ietf.org >> https://www.ietf.org/mailman/listinfo/mpls >> >> >> > > --001a1134fbb470c137054f1c9329 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Carlos,
I probably would characterize anything that= starts with Why not as a technical comment but rather as a question.
=
According to=C2=A0draft-ietf-spring= -segment-routing-mpls, "In the MPLS=C2=A0dataplane,the SR header is insta= ntiated through a label stack".
At the same time, one of advantages of SR is that &qu= ot;per-flow state only [maintained] at the ingress node to th= e SR=C2=A0domain".
Thus, for the case of monitoring unid= irectional SR tunnels, I consider that there's no need to create any ad= ditional state on the egress node.
Of course, if there were bidirectional S= R tunnels, then control of the reverse direction of the BFD session would n= ot require use of the Return Path sub-TLV.
As for LSP-Ping, I just propose = that the Segment Routing MPLS Tunnel sub-TLV MAY be used Reply Path TLV def= ined in RFC 7110. I viewed the proposal as invitation to technical discussi= on.

Regards,
Greg
=
On Tue, May 9, 2017 at 9:07 AM, Carlos Pigna= taro (cpignata) <cpignata@cisco.com> wrote:
Thank you Greg!

Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems quite= similar to the text removed at https://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-bfd-directe= d-05.txt, then the complete set of outstanding technical comments that = triggered the removal of that text from draft-ietf-mpls-bfd-directed-0= 5.txt might peek your interest :-)

One that I recall is: why use label values when every other return-pat= h sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directed,= uses TFSs?=C2=A0

Best,

=E2=80=94 Carlos.

On May 9, 2017, at 12:00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear Carlos,
I've decided to re-start the discussion and am interested to hear = technical comments to the proposed solution.=C2=A0

Regards,
Greg

On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro= (cpignata) <cpignata@cisco.com> wrote:
Dear Greg,

Cursorily scanning through this, it seems that most concerns raised an= d comments made about the SR sections of=C2=A0draft-ietf-mpls-bfd-directed-0N (with N < 5) apply to your new draft.

This is one of those:=C2=A0https://www.ietf.org/ma= il-archive/web/mpls/current/msg15860.html =E2=80=94 the list = archive shows a few more. The copy/paste did not address the comments.

Best,

=E2=80=94 Carlos.

On May 8, 2017, at 11:33 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear All,
perhaps this new draft may is of interest to you.
Your comments, suggestions are most welcome and greatly appreciated.

Regards,
Greg

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Mon, May 8, 2017 at 8:29 PM
Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt
To: Gregory Mirsky <gregimirsky@gmail.com>



A new version of I-D, draft-mirsky-spring-bfd-00.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mirsky-spring-bfd
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bidirectional Forwarding Detection= (BFD) in Segment Routing Networks Using MPLS Dataplane
Document date:=C2=A0 2017-05-08
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draft-mirsky-spring-bfd-00.t= xt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ht= tps://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://to= ols.ietf.org/html/draft-mirsky-spring-bfd-00
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0= https://datatracker.ietf.org/doc/html/draft-mirsky-spring-bfd-00<= /a>


Abstract:
=C2=A0 =C2=A0Segment Routing architecture leverages the paradigm of source<= br> =C2=A0 =C2=A0routing.=C2=A0 It can be realized in the Multiprotocol Label S= witching
=C2=A0 =C2=A0(MPLS) network without any change to the data plane.=C2=A0 A s= egment is
=C2=A0 =C2=A0encoded as an MPLS label and an ordered list of segments is en= coded
=C2=A0 =C2=A0as a stack of labels.=C2=A0 Bidirectional Forwarding Detection= (BFD) is
=C2=A0 =C2=A0expected to monitor any kind of paths between systems.=C2=A0 T= his document
=C2=A0 =C2=A0defines how to use Label Switched Path Ping to bootstrap and c= ontrol
=C2=A0 =C2=A0path in reverse direction of a BFD session on the Segment Rout= ing
=C2=A0 =C2=A0network over MPLS dataplane.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls




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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 May 2017 14:27:16 -0000 --------------34C0B66DB9C4BB1A632C8D4A Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 8bit On 5/4/2017 2:35 PM, Les Ginsberg (ginsberg) wrote: > When G forwards the packet to A, because A has not advertised the > prefix-SID (but is SR capable) we do not know whether it wants PHP or > not so we have to make an assumption. > > Default MPLS behavior is to assume PHP. > I'm not sure why you think there is such a thing as "default MPLS behavior" in this regard. In conventional MPLS, when a node advertises the binding of a label to a FEC, PHP will not occur unless the advertised label is Implicit NULL. If you advertise a different label, you don't get PHP. If there were any such thing as a default behavior for MPLS, it wouldn't make any sense for PHP to be the default behavior. You can only advertise Implicit NULL if you know that the packet can be properly processed after the top label is popped off. Whether PHP will give the right result is application-specific. So if there were a default behavior, it would have to be "don't do PHP". But of course MPLS has no need of such a default behavior, because each node advertises its own labels. Since the segment routing architecture allows cases where you don't know whether the next hop wants you to pop the stack or not, segment routing needs to have a default, and the only sensible default is "don't do PHP". This should be stated in whatever document discusses the use of the MPLS data plane for segment routing. I don't see that there is any issue for the MPLS WG. > If A does not want PHP then it would have to advertise the prefix SID > so it could specify desired behavior using P/E flags. > A default of "do PHP" doesn't seem sensible, as it may result in the exposure of a label at a node that cannot process it properly. > Historically, MPLS implementations have chosen a default behavior > (equivalent to P and E flags = 0). Some implementations provide knobs > to override this behavior. > I wonder if you're thinking about the case where the next hop has advertised Implicit NULL for a particular FEC, but the current hop actually uses Explicit NULL in order to have a place to put the TC field, which would otherwise be lost when PHP is done. That doesn't really seem relevant to the issue that Shraddha raised. > > If your concern is that there is not an explicit definition of default > PHP/Explicit NULL behavior, then I think this needs to be directed at > the MPLS WG. > I think this is incorrect, as explained above. > I do not claim to be an MPLS expert, but I have found these references: > > RFC 3036 Section 6 > > - Section 2.16 of the MPLS architecture [RFC3031] requires that > > the initial label distribution protocol negotiation between > > peer LSRs enable each LSR to determine whether its peer is > > capable of popping the label stack. This version of LDP > > assumes that LSRs support label popping for all link types > > except ATM and Frame Relay. A future version may specify means > > to make this determination part of the session initiation > > negotiation. > Well, you don't have to be an MPLS expert to notice that RFC3036 was obsoleted ten years ago ;-) In any event, the above quote is not relevant. It simply says that when using LDP, an LSR may assume, for most data link types, that an LDP peer is capable of popping the top label off the stack. Thus it is allowable to advertise to the peer a binding of Implicit NULL to a FEC. This is an issue for LDP, but there is no way to apply the quoted passage to segment routing. This really needs to be addressed in some SPRING draft or other. --------------34C0B66DB9C4BB1A632C8D4A Content-Type: text/html; charset="windows-1252" Content-Transfer-Encoding: 8bit On 5/4/2017 2:35 PM, Les Ginsberg (ginsberg) wrote:

When G forwards the packet to A, because A has not advertised the prefix-SID (but is SR capable) we do not know whether it wants PHP or not so we have to make an assumption.

Default MPLS behavior is to assume PHP.


I'm not sure why you think there is such a thing as "default MPLS behavior" in this regard. In conventional MPLS, when a node advertises the binding of a label to a FEC, PHP will not occur unless the advertised label is Implicit NULL. If you advertise a different label, you don't get PHP.

If there were any such thing as a default behavior for MPLS, it wouldn't make any sense for PHP to be the default behavior. You can only advertise Implicit NULL if you know that the packet can be properly processed after the top label is popped off. Whether PHP will give the right result is application-specific. So if there were a default behavior, it would have to be "don't do PHP". But of course MPLS has no need of such a default behavior, because each node advertises its own labels.

Since the segment routing architecture allows cases where you don't know whether the next hop wants you to pop the stack or not, segment routing needs to have a default, and the only sensible default is "don't do PHP". This should be stated in whatever document discusses the use of the MPLS data plane for segment routing. I don't see that there is any issue for the MPLS WG.

If A does not want PHP then it would have to advertise the prefix SID so it could specify desired behavior using P/E flags.


A default of "do PHP" doesn't seem sensible, as it may result in the exposure of a label at a node that cannot process it properly.

Historically, MPLS implementations have chosen a default behavior (equivalent to P and E flags = 0). Some implementations provide knobs to override this behavior.


I wonder if you're thinking about the case where the next hop has advertised Implicit NULL for a particular FEC, but the current hop actually uses Explicit NULL in order to have a place to put the TC field, which would otherwise be lost when PHP is done. That doesn't really seem relevant to the issue that Shraddha raised.

If your concern is that there is not an explicit definition of default PHP/Explicit NULL behavior, then I think this needs to be directed at the MPLS WG.


I think this is incorrect, as explained above.

I do not claim to be an MPLS expert, but I have found these references:

RFC 3036 Section 6

- Section 2.16 of the MPLS architecture [RFC3031] requires that

the initial label distribution protocol negotiation between

peer LSRs enable each LSR to determine whether its peer is

capable of popping the label stack. This version of LDP

assumes that LSRs support label popping for all link types

except ATM and Frame Relay. A future version may specify means

to make this determination part of the session initiation

negotiation.


Well, you don't have to be an MPLS expert to notice that RFC3036 was obsoleted ten years ago ;-)

In any event, the above quote is not relevant. It simply says that when using LDP, an LSR may assume, for most data link types, that an LDP peer is capable of popping the top label off the stack. Thus it is allowable to advertise to the peer a binding of Implicit NULL to a FEC. This is an issue for LDP, but there is no way to apply the quoted passage to segment routing.

This really needs to be addressed in some SPRING draft or other.

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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 May 2017 17:34:09 -0000 I have a few questions/comments on Section 3 of draft-filsfils-spring-segment-routing-policy-00. Mostly they are about text that is subject to different interpretatons, or about situations where the draft doesn't make it clear what to do. There are some substantive issues that really need clarification and/or further discussion. For convenience, I've reproduced the Section 3 below, and have inserted my questions/comments in-line, beginning with "Eric> ". ---------------- 3. SR Policy An SR Policy is identified through the following tuple: o The head-end where the policy is instantiated/implemented. o The endpoint (i.e.: the destination of the policy). o The color (an arbitrary numerical value). At a given head-end, an SR Policy is fully identified by the tuple. An endpoint can be specified as an IPv4 or IPv6 address. An SR Policy contain contains one or more candidate paths. ---------------- Eric> Perhaps: "An SR Policy is associated with one or more candidate paths" ---------------- An SR Policy instantiates one single path in RIB/FIB: i.e. the selected path among the candidate paths. ---------------- Eric> I think it would be clearer to say "For each SR Policy, at most one candidate path is selected, and only the selected path is used for forwarding traffic that is being steered to that policy." (I'd avoid mentioning the FIB at all, since that will just raise questions about whether the FIB can have paths that aren't in the RIB.) ---------------- A candidate path is either dynamic or explicit. A dynamic path expresses an optimization objective and a set of constraints. The headend computes a solution to the optimization problem as a Segment Identifier (SID) list or a set of SID lists. When the headend does not have enough topological information (e.g. multi-domain problem), the headend may delegate the computation to a PCE. Whenever the network situation changes, the path is recomputed. ---------------- Eric> Perhaps: "Whenever the solution to the optimization problem may have changed, the path is recomputed". ---------------- An explicit path is a SID list or a set of SID lists. A candidate path has a preference. If not specified, the default preference is 100. A candidate path is associated with a single Binding SID (BSID). ---------------- Eric> This seems to suggest that the mapping from a "candidate path" to a BSID is a one-one mapping. However, I don't think that's correct. Two different SR policies might happen to be associated with identical candidate paths. In that case, wouldn't one still want each policy to be associated with a distinct BSID? Eric> Actually, I'd have thought that what is needed is that there be a one-one mapping in the control plane from BSID to SR Policy. In the data plane, a BSID that maps to a given SR Policy maps to the selected path for that policy. Eric> I think the draft needs to be modified to make it clear which interpretation (if either) is the correct one. ---------------- A candidate path is valid if it is usable. A common path validity criterion is the reachability of its constituent SIDs. The validation rules are defined in a later section. A Path is selected (i.e. it is the best path of the policy) when it is valid and its preference is the best (highest value) among all the paths of the SR Policy. ---------------- Eric> Perhaps: "among all the candidate paths of the SR Policy". ---------------- Whenever a new path is learned or the validity of an existing path changes or an existing path is changed, the selection process must be re-executed. A headend may be informed about a path for a policy ---------------- Eric> Perhaps: "about a path" --> "about a candidate path" ---------------- by various means including: local configuration, NETCONF, PCEP or BGP. The protocol source of the path does not matter to the path selection logic. ---------------- Eric> I find the last sentence to be very confusing, as the term "the path selection logic" is not clearly defined. Eric> One can interpret the paragraph to mean the following: "For a given Policy, when comparing a candidate path learned via one means to a candidate path learned via another means, one path will be regarded as preferable to the other. The determination of which path is the preferable one does not depend upon the means by which the path was learned." Eric> That seems reasonable, though it might be good to add: "If two candidate paths are learned via different means, the choice between them is not to be based upon the 'administrative distance' or 'route preference' metrics that are typically used when comparing routes that are distributed by different routing protocols. (If that's actually what is meant.) Eric> But one could also interpret the paragraph to mean that when multiple candidate paths for a given Policy are distributed by BGP, that the BGP bestpath selection process is not applied. That interpretation would not be correct, and would in fact be in conflict with draft-previdi-idr-segment-routing-te-policy. I'd like to see that clarified here. Eric> (Draft-previdi also has some imprecise language about BGP being "just a conveyor". That language should really be removed, as it is just a metaphor, and is subject to many different interpretations.) Eric> When considering the BGP distribution of candidate paths for a Policy, there is a gray area that needs to be addressed. In BGP, the policy would be represented as a route whose NLRI is and that carries an RT that is an import RT of the headend. It is possible that a given headend will import both and , where RD1 != RD2. This is analogous to a familiar situation from L3VPN, where both and are imported into a given VRF. In this situation, L3VPN selects the bestpath by using the BGP Bestpath Selection procedure, but ignoring the fact that the RDs are different. Eric> I have always assumed that the analogous procedure would be applied when comparing two BGP-distributed SR Policy "routes" wnose NLRIs differ only in their RDs. Some private conversations among vendors have indicated that this assumption is shared by others. However, this is not stated clearly in either draft-previdi or draft-filsfils, and I have discovered recently that not everyone shares this assumption. I've even heard people refer to the statement in draft-filsfils that "the protocol source of the path does not matter to the path selection logic" as "proof" that my assumption is incorrect. Eric> So I'd like to see some text in one draft or the other that makes the intention very clear. (Given such text, we might or might not want to argue about it further.) ---------------- In the vast majority of use-cases known to date, a path is associated with a single SID list and each path of a policy has a different preference. ---------------- Eric> That's an interesting historical observation, but a protocol spec has to make it clear what needs to be done in the case where different candidate paths have the same preference. Is the final selection left to the implementation, or is it desirable to have a tie breaking process that always makes it deterministic which of a set of candidate paths becomes the selected path for a given SR Policy? The draft should specify one or the other of these options. ---------------- The SID list of an SR Policy is the SID list of its selected path. ---------------- Eric> The above sentence is very confusing, as a path may consist of a set of SID lists, but the sentence presupposes that a path consists of a single SID list. Perhaps that sentence can just be removed? ---------------- The BSID of an SR Policy refers to its selected path. In all the use-cases known to date, all the paths associated with a given policy have the same BSID. One may thus assume that in practice a policy has a stable BSID that is independent of the selected path changes and this BSID is an identification of a policy. ---------------- Eric> Observations about the characteristics of "all the use-cases known to date" do not determine what one "may assume" about the future. If the intention is that, at any given time, a given BSID maps directly to a single SR Policy and indirectly to its selected path, please state this explicitly, using normative terminology (e.g., RFC2119 "MUST"). ---------------- However, one should know that a BSID MAY change over the life of an ---------------- Eric> Perhaps "a BSID MAY change" --> "the mapping from a given BSID to an SR Policy may change". ---------------- SR Policy and the true identification of a policy is the tuple . An SR Policy is active at a headend as soon as this head-end knows about a valid path for this policy. An active SR Policy installs a BSID-keyed entry in the forwarding plane with the action of steering the packets matching this entry to the SID list of the SR Policy. ---------------- Eric> I think "the SID list of the SR Policy" should be replaced with "the selected path of the SR Policy". ---------------- If a set of SID lists is associated with the selected path of the policy, then the steering is flow and W-ECMP based according to the relative weight of each SID list. In summary, the information model is the following: SR policy FOO path 200 (selected) BSID1 Weight W1, SID list1: SID11...SID1i Weight W2, SID list2: SID21...SID2j path 100 (selected) BSID2 Weight W3, SID list3: SID31...SID3i Weight W4, SID list4: SID41...SID4j ---------------- Eric> It is not clear what (if anything) the numbers "200" and "100" are meant to represent. Eric> The above seems to suggest that Policy FOO has two selected paths. That doesn't seem compatible with prior text that says only one path is selected from among the candidate paths. ---------------- In general BSDIn = BSID1 = BSID2 ... ---------------- Eric> I don't see that this observation about what happens "in general" is really useful, except perhaps a recommendation to operators. The draft needs to specify exactly what happens if two different BSIDs are assigned to the same Policy. Eric> For concreteness, let's assume that Policy is distributed by BGP with BSID1, and that the same policy is distributed by PCEP with BSID2. And let's assume that the selected path for that Policy is a path that is distributed by BGP. Now what is headend1 supposed to do if it sees a packet whose top label is BSID2? Would BSID2 be considered to be an invalid incoming label, or would it be considered to denote the Policy? If the latter, presumably it would denote the selected path for that Policy, even though the BSID was distributed by PCEP and the selected path was distributed by BGP. From nobody Wed May 10 12:25:16 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A37E412EA74; Wed, 10 May 2017 12:25:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E2Z4OsZlgIrf; Wed, 10 May 2017 12:25:06 -0700 (PDT) Received: from rcdn-iport-6.cisco.com (rcdn-iport-6.cisco.com [173.37.86.77]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BFF1512EA6A; Wed, 10 May 2017 12:25:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=23734; q=dns/txt; s=iport; t=1494444305; x=1495653905; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=3D8DG/LRuhURy/OPI+AudnyFtFyljp+M1x7zxnWErYI=; b=FQXwhcAII5q1wD1SGe51vDoBEeiUogbmvoWCKehc4oB8qMfgm9+JDkuW 7z9zno/Gazp5ZVVD54i6l+TwmG54Ion+1g9soP9R1SyTd1bldKlHi/LDS sBN232QN9LNi8/6quNGDNT3sIUrfhvDXkA1p4C1+PN1Uf7nfRNlqYuaZD 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0BUAQC4aBNZ/4wNJK1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm5nYoEMB4NiihiRNyGII4gXhTiCDyEBCoV4AhqEZj8YAQIBAQE?= =?us-ascii?q?BAQEBayiFFQEBAQEDAQEhSwkCEAIBCBEBAgECKAMCAgIfBgsUAwYIAgQOBRuJb?= =?us-ascii?q?gMVDrJVgiaHMA2DOAEBAQEBAQEBAQEBAQEBAQEBAQEBAR2GX4FeKwuCZYJUTYE?= =?us-ascii?q?lAQE7FgiCUC+CMQWJRIZehk2GYDsBhxuHLIRTggRVhGaKLIsthHcog3YBDxA4g?= =?us-ascii?q?QpwFRwqEgGEKjkcgWN2AYZqgSGBDQEBAQ?= X-IronPort-AV: E=Sophos;i="5.38,320,1491264000"; d="scan'208,217";a="243726006" Received: from alln-core-7.cisco.com ([173.36.13.140]) by rcdn-iport-6.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 10 May 2017 19:24:53 +0000 Received: from XCH-RTP-020.cisco.com (xch-rtp-020.cisco.com [64.101.220.160]) by alln-core-7.cisco.com (8.14.5/8.14.5) with ESMTP id v4AJOrxW014129 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 10 May 2017 19:24:53 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-020.cisco.com (64.101.220.160) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 10 May 2017 15:24:52 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1210.000; Wed, 10 May 2017 15:24:52 -0400 From: "Carlos Pignataro (cpignata)" To: Greg Mirsky CC: "spring@ietf.org" , "rtg-bfd@ietf.org" , "mpls@ietf.org" Thread-Topic: [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt Thread-Index: AQHSyNwl4f82jzKO5Eq8Ccd1kzJOwKHsbA8AgAAB9QCAADyAAIABjQKA Date: Wed, 10 May 2017 19:24:52 +0000 Message-ID: <9D886964-6C21-427C-8733-7731D5A996D3@cisco.com> References: <149430058880.24107.8628199428997673992.idtracker@ietfa.amsl.com> <1C12E162-6B5C-4EF2-A3CB-3621C72BCFE9@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.117.115.52] Content-Type: multipart/alternative; boundary="_000_9D8869646C21427C87337731D5A996D3ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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1bV2Hh77Q2SJThvflm1DfRq4+0avOhoXCmmox4IlzAXbhDzNEZQZG+pTs8yv6IK2mwYa JK+sr63PuPlVkNkiLjgc7gFKxcicOZFL14X5kHMK6fokdCU0b+qaCkz9BuH72K/cNwuo z/JdmN2Utoua8VKWJvzb1yy5JXsI56gQU9mPHX2UBNb/szHQ2JN1YTTGE5QuXGUvaMoE Gmjw== X-Gm-Message-State: AODbwcCJCJ/OM/ashqL16ZThZGtbgsuPqpkVyEsUmBjXLzOiZcAtj4Yl WHFmiN6ymCtMxpus9i5mOCB6OuzDyQ== X-Received: by 10.107.205.132 with SMTP id d126mr5071044iog.155.1494445200753; Wed, 10 May 2017 12:40:00 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.79.62.24 with HTTP; Wed, 10 May 2017 12:40:00 -0700 (PDT) In-Reply-To: <9D886964-6C21-427C-8733-7731D5A996D3@cisco.com> References: <149430058880.24107.8628199428997673992.idtracker@ietfa.amsl.com> <1C12E162-6B5C-4EF2-A3CB-3621C72BCFE9@cisco.com> <9D886964-6C21-427C-8733-7731D5A996D3@cisco.com> From: Robert Raszuk Date: Wed, 10 May 2017 21:40:00 +0200 X-Google-Sender-Auth: x_PauMqsKG4nRRs352gzM0YQgdI Message-ID: To: "Carlos Pignataro (cpignata)" Cc: Greg Mirsky , "mpls@ietf.org" , "spring@ietf.org" , "rtg-bfd@ietf.org" Content-Type: multipart/alternative; boundary=94eb2c18871853f0c7054f30a3b7 Archived-At: Subject: Re: [spring] [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 May 2017 19:40:04 -0000 --94eb2c18871853f0c7054f30a3b7 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Carlos, Sorry what is "TFS" ? RFC 7110 does not even use such abbreviation neither do draft-ietf-mpls-bfd-directed :) Google also seems to be pretty clueless about it. Just curious as you keep using this term in each email :) Thx, R. On Wed, May 10, 2017 at 9:24 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Greg, > > In the MPLS data plane, FECs are also instantiated through a label stack. > But RFC 7110 does not use numeric label values, it uses TFSs. That does n= ot > create any additional state. E.g.,: https://www.ietf.org/ > mail-archive/web/mpls/current/msg16091.html > > Thanks, > > =E2=80=94 Carlos. > > > > On May 9, 2017, at 3:43 PM, Greg Mirsky wrote: > > Hi Carlos, > I probably would characterize anything that starts with Why not as a > technical comment but rather as a question. > According to draft-ietf-spring-segment-routing-mpls, "In the MPLS > dataplane,the SR header is instantiated through a label stack". > At the same time, one of advantages of SR is that "per-flow state only > [maintained] at the ingress node to the SR domain". > Thus, for the case of monitoring unidirectional SR tunnels, I consider > that there's no need to create any additional state on the egress node. > Of course, if there were bidirectional SR tunnels, then control of the > reverse direction of the BFD session would not require use of the Return > Path sub-TLV. > As for LSP-Ping, I just propose that the Segment Routing MPLS Tunnel > sub-TLV MAY be used Reply Path TLV defined in RFC 7110. I viewed the > proposal as invitation to technical discussion. > > Regards, > Greg > > On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > >> Thank you Greg! >> >> Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems quite >> similar to the text removed at https://tools.ietf.org/rfcdiff >> ?url2=3Ddraft-ietf-mpls-bfd-directed-05.txt, then the complete set of >> outstanding technical comments that triggered the removal of that text f= rom >> draft-ietf-mpls-bfd-directed-05.txt might peek your interest :-) >> >> One that I recall is: why use label values when every other return-path >> sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directed= , >> uses TFSs? >> >> Best, >> >> =E2=80=94 Carlos. >> >> On May 9, 2017, at 12:00 PM, Greg Mirsky wrote: >> >> Dear Carlos, >> I've decided to re-start the discussion and am interested to hear >> technical comments to the proposed solution. >> >> Regards, >> Greg >> >> On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro (cpignata) < >> cpignata@cisco.com> wrote: >> >>> Dear Greg, >>> >>> Cursorily scanning through this, it seems that most concerns raised and >>> comments made about the SR sections of draft-ietf-mpls-bfd-directed-0N >>> (with N < 5) apply to your new draft. >>> >>> This is one of those: https://www.ietf.org/ma >>> il-archive/web/mpls/current/msg15860.html =E2=80=94 the list archive sh= ows a >>> few more. The copy/paste did not address the comments. >>> >>> Best, >>> >>> =E2=80=94 Carlos. >>> >>> On May 8, 2017, at 11:33 PM, Greg Mirsky wrote: >>> >>> Dear All, >>> perhaps this new draft may is of interest to you. >>> Your comments, suggestions are most welcome and greatly appreciated. >>> >>> Regards, >>> Greg >>> >>> ---------- Forwarded message ---------- >>> From: >>> Date: Mon, May 8, 2017 at 8:29 PM >>> Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt >>> To: Gregory Mirsky >>> >>> >>> >>> A new version of I-D, draft-mirsky-spring-bfd-00.txt >>> has been successfully submitted by Greg Mirsky and posted to the >>> IETF repository. >>> >>> Name: draft-mirsky-spring-bfd >>> Revision: 00 >>> Title: Bidirectional Forwarding Detection (BFD) in Segment >>> Routing Networks Using MPLS Dataplane >>> Document date: 2017-05-08 >>> Group: Individual Submission >>> Pages: 7 >>> URL: https://www.ietf.org/internet- >>> drafts/draft-mirsky-spring-bfd-00.txt >>> Status: https://datatracker.ietf.org/ >>> doc/draft-mirsky-spring-bfd/ >>> Htmlized: https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 >>> Htmlized: https://datatracker.ietf.org/ >>> doc/html/draft-mirsky-spring-bfd-00 >>> >>> >>> Abstract: >>> Segment Routing architecture leverages the paradigm of source >>> routing. It can be realized in the Multiprotocol Label Switching >>> (MPLS) network without any change to the data plane. A segment is >>> encoded as an MPLS label and an ordered list of segments is encoded >>> as a stack of labels. Bidirectional Forwarding Detection (BFD) is >>> expected to monitor any kind of paths between systems. This documen= t >>> defines how to use Label Switched Path Ping to bootstrap and control >>> path in reverse direction of a BFD session on the Segment Routing >>> network over MPLS dataplane. >>> >>> >>> >>> >>> Please note that it may take a couple of minutes from the time of >>> submission >>> until the htmlized version and diff are available at tools.ietf.org. >>> >>> The IETF Secretariat >>> >>> >>> _______________________________________________ >>> mpls mailing list >>> mpls@ietf.org >>> https://www.ietf.org/mailman/listinfo/mpls >>> >>> >>> >> >> > > --94eb2c18871853f0c7054f30a3b7 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Carlos,

=
Sorry what is "TFS" ?=C2=A0

RFC 7110 does not even use such ab= breviation neither do=C2=A0draft-ietf-mpls-bfd-directed=C2=A0:) Google also seems to= be pretty clueless about it.=C2=A0

Just curious as you keep using this term in each email :)=C2= =A0

Thx,
R.

On Wed, May 1= 0, 2017 at 9:24 PM, Carlos Pignataro (cpignata) <cpignata@cisco.com&g= t; wrote:
Greg,

In the MPLS data plane, FECs are also instantiated through a label sta= ck. But RFC 7110 does not use numeric label values, it uses TFSs. That does= not create any additional state. E.g.,:=C2=A0https://w= ww.ietf.org/mail-archive/web/mpls/current/msg16091.html

Thanks,

=E2=80=94 Carlos.



On May 9, 2017, at 3:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

Hi Carlos,
I probably would characterize anything that starts with Why not as a t= echnical comment but rather as a question.
According to=C2=A0draft-ietf-spring-segment-routing-mpls, "= In the MPLS=C2=A0dat= aplane,the SR head= er is instantiated through a label stack".
At the same time, one of advantages of SR is that &= quot;per-flow state only [maintained] at the ingress node to the SR=C2=A0domain".
Thus, for the case of monitoring uni= directional SR tunnels, I consider that there's no need to create any a= dditional state on the egress node.
Of course, if there were bidirection= al SR tunnels, then control of the reverse direction of the BFD session wou= ld not require use of the Return Path sub-TLV.
As for LSP-Ping, I just propose that= the Segment Routing MPLS Tunnel sub-TLV MAY be used Reply Path TLV defined= in RFC 7110. I viewed the proposal as invitation to technical discussion.

Regards,
Greg

On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro= (cpignata) <cpignata@cisco.com> wrote:
Thank you Greg!

Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems quite= similar to the text removed at https://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-bfd-directe= d-05.txt, then the complete set of outstanding technical comments that = triggered the removal of that text from draft-ietf-mpls-bfd-directed-0= 5.txt might peek your interest :-)

One that I recall is: why use label values when every other return-pat= h sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directed,= uses TFSs?=C2=A0

Best,

=E2=80=94 Carlos.

On May 9, 2017, at 12:00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear Carlos,
I've decided to re-start the discussion and am interested to hear = technical comments to the proposed solution.=C2=A0

Regards,
Greg

On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro= (cpignata) <cpignata@cisco.com> wrote:
Dear Greg,

Cursorily scanning through this, it seems that most concerns raised an= d comments made about the SR sections of=C2=A0draft-ietf-mpls-bfd-directed-0N (with N < 5) apply to your new draft.

This is one of those:=C2=A0https://www.ietf.org/ma= il-archive/web/mpls/current/msg15860.html =E2=80=94 the list = archive shows a few more. The copy/paste did not address the comments.

Best,

=E2=80=94 Carlos.

On May 8, 2017, at 11:33 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear All,
perhaps this new draft may is of interest to you.
Your comments, suggestions are most welcome and greatly appreciated.

Regards,
Greg

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Mon, May 8, 2017 at 8:29 PM
Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt
To: Gregory Mirsky <gregimirsky@gmail.com>



A new version of I-D, draft-mirsky-spring-bfd-00.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mirsky-spring-bfd
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bidirectional Forwarding Detection= (BFD) in Segment Routing Networks Using MPLS Dataplane
Document date:=C2=A0 2017-05-08
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draft-mirsky-spring-bfd-00.t= xt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ht= tps://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://to= ols.ietf.org/html/draft-mirsky-spring-bfd-00
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0= https://datatracker.ietf.org/doc/html/draft-mirsky-spring-bfd-00<= /a>


Abstract:
=C2=A0 =C2=A0Segment Routing architecture leverages the paradigm of source<= br> =C2=A0 =C2=A0routing.=C2=A0 It can be realized in the Multiprotocol Label S= witching
=C2=A0 =C2=A0(MPLS) network without any change to the data plane.=C2=A0 A s= egment is
=C2=A0 =C2=A0encoded as an MPLS label and an ordered list of segments is en= coded
=C2=A0 =C2=A0as a stack of labels.=C2=A0 Bidirectional Forwarding Detection= (BFD) is
=C2=A0 =C2=A0expected to monitor any kind of paths between systems.=C2=A0 T= his document
=C2=A0 =C2=A0defines how to use Label Switched Path Ping to bootstrap and c= ontrol
=C2=A0 =C2=A0path in reverse direction of a BFD session on the Segment Rout= ing
=C2=A0 =C2=A0network over MPLS dataplane.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls






--94eb2c18871853f0c7054f30a3b7-- From nobody Wed May 10 12:42:21 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A7B2E12EAA9; Wed, 10 May 2017 12:42:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.398 X-Spam-Level: X-Spam-Status: No, score=-2.398 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.199, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lllpogR1dOFy; Wed, 10 May 2017 12:42:01 -0700 (PDT) Received: from mail-it0-x22d.google.com (mail-it0-x22d.google.com [IPv6:2607:f8b0:4001:c0b::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 090C6128AB0; Wed, 10 May 2017 12:42:01 -0700 (PDT) Received: by mail-it0-x22d.google.com with SMTP id e65so8022369ita.1; Wed, 10 May 2017 12:42:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=TEdy2bHd6L1ahTmEy06UhWRMlZCCotYRPJMjLgjKEJo=; b=UaenTSAALvQUyF3UJBal2YaGaapBUJlfECkV3jsw3nc1hfq9P4a2ZxKl5SfXr2gXON kDHnT5V0xiRVuGDKUoiQUG9kE0t+QUk4tlJYfZSAkzzLq6C+DoS7s8L0bXNsnzAEZash abWmB7JLGEemrnvVG6w76A3JYpfSXshfklYlIzhVtOke0kFlHo238YdKB7sZef0KLWIy S1QoxeEhrgNAQZAx2d0sTOE/dKSz1YDGDNpaMBpzcwGQ5JBqAq7zcfB6I2ONnXwFk0aC 1yFY1E9N3SCQFHsSJA6fOem/qVwGSFoAQfCdxCIVKjqnFA4w+CnNWQANd/fwzgpdgsMH OWpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=TEdy2bHd6L1ahTmEy06UhWRMlZCCotYRPJMjLgjKEJo=; b=QUVu4Cgim5lNObwoiU30/bHXMPN+XcUAMgzskXLKK9qBg+a24uPGOnSGt6pcnzX5yS hJnKzE/MMV79RYKCgzb6XkZU4H2gTSA6wXwQtxlH69eLVGAbEQv2BTWDzrIWHiLev7qN jW5ngOQ/fs/SAyasL3u4L6ZvjoASOtGK+UfQ/2Fp83lXYuJJ69EF8Pgr0rgbzjq0rT7H uPnNmAT3xtyfvI5orVeAKhidPndvL4PtkDcSd0OI7yXYFph5uMTIfKNYw7ZIs7/wYXob RM2hSelp8IdebQ6pkIQMYO58kA1ZKpk1R7My3lEaUmxQ6CI7pjyb6q2sFhRa18Oa6Xze c9OQ== X-Gm-Message-State: AODbwcC6eNm4zADE5aFBEDPSPHWEKdt3ufQL22adOWOoOt7txkwuIrzl gZKM/TWJb7kfEBkVdN2To0Kw5AHAX0Oot8w= X-Received: by 10.36.125.197 with SMTP id b188mr7099939itc.59.1494445320238; Wed, 10 May 2017 12:42:00 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.79.62.24 with HTTP; Wed, 10 May 2017 12:41:59 -0700 (PDT) In-Reply-To: References: <149430058880.24107.8628199428997673992.idtracker@ietfa.amsl.com> <1C12E162-6B5C-4EF2-A3CB-3621C72BCFE9@cisco.com> <9D886964-6C21-427C-8733-7731D5A996D3@cisco.com> From: Robert Raszuk Date: Wed, 10 May 2017 21:41:59 +0200 X-Google-Sender-Auth: rgwSCYFZFs41rD-zSR4UiCp2kpA Message-ID: To: "Carlos Pignataro (cpignata)" Cc: Greg Mirsky , "mpls@ietf.org" , "spring@ietf.org" , "rtg-bfd@ietf.org" Content-Type: multipart/alternative; boundary=001a114043b0731de7054f30aa83 Archived-At: Subject: Re: [spring] [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 May 2017 19:42:03 -0000 --001a114043b0731de7054f30aa83 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Never mind .. I guess you made it up from "Target FEC Stack" :) On Wed, May 10, 2017 at 9:40 PM, Robert Raszuk wrote: > Hi Carlos, > > Sorry what is "TFS" ? > > RFC 7110 does not even use such abbreviation neither do > draft-ietf-mpls-bfd-directed :) Google also seems to be pretty clueless > about it. > > Just curious as you keep using this term in each email :) > > Thx, > R. > > On Wed, May 10, 2017 at 9:24 PM, Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > >> Greg, >> >> In the MPLS data plane, FECs are also instantiated through a label stack= . >> But RFC 7110 does not use numeric label values, it uses TFSs. That does = not >> create any additional state. E.g.,: https://www.ietf.org/ma >> il-archive/web/mpls/current/msg16091.html >> >> Thanks, >> >> =E2=80=94 Carlos. >> >> >> >> On May 9, 2017, at 3:43 PM, Greg Mirsky wrote: >> >> Hi Carlos, >> I probably would characterize anything that starts with Why not as a >> technical comment but rather as a question. >> According to draft-ietf-spring-segment-routing-mpls, "In the MPLS >> dataplane,the SR header is instantiated through a label stack". >> At the same time, one of advantages of SR is that "per-flow state only >> [maintained] at the ingress node to the SR domain". >> Thus, for the case of monitoring unidirectional SR tunnels, I consider >> that there's no need to create any additional state on the egress node. >> Of course, if there were bidirectional SR tunnels, then control of the >> reverse direction of the BFD session would not require use of the Return >> Path sub-TLV. >> As for LSP-Ping, I just propose that the Segment Routing MPLS Tunnel >> sub-TLV MAY be used Reply Path TLV defined in RFC 7110. I viewed the >> proposal as invitation to technical discussion. >> >> Regards, >> Greg >> >> On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro (cpignata) < >> cpignata@cisco.com> wrote: >> >>> Thank you Greg! >>> >>> Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems >>> quite similar to the text removed at https://tools.ietf.org/rfcdiff >>> ?url2=3Ddraft-ietf-mpls-bfd-directed-05.txt, then the complete set of >>> outstanding technical comments that triggered the removal of that text = from >>> draft-ietf-mpls-bfd-directed-05.txt might peek your interest :-) >>> >>> One that I recall is: why use label values when every other return-path >>> sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directe= d, >>> uses TFSs? >>> >>> Best, >>> >>> =E2=80=94 Carlos. >>> >>> On May 9, 2017, at 12:00 PM, Greg Mirsky wrote: >>> >>> Dear Carlos, >>> I've decided to re-start the discussion and am interested to hear >>> technical comments to the proposed solution. >>> >>> Regards, >>> Greg >>> >>> On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro (cpignata) < >>> cpignata@cisco.com> wrote: >>> >>>> Dear Greg, >>>> >>>> Cursorily scanning through this, it seems that most concerns raised an= d >>>> comments made about the SR sections of draft-ietf-mpls-bfd-directed-0N >>>> (with N < 5) apply to your new draft. >>>> >>>> This is one of those: https://www.ietf.org/ma >>>> il-archive/web/mpls/current/msg15860.html =E2=80=94 the list archive s= hows a >>>> few more. The copy/paste did not address the comments. >>>> >>>> Best, >>>> >>>> =E2=80=94 Carlos. >>>> >>>> On May 8, 2017, at 11:33 PM, Greg Mirsky wrote= : >>>> >>>> Dear All, >>>> perhaps this new draft may is of interest to you. >>>> Your comments, suggestions are most welcome and greatly appreciated. >>>> >>>> Regards, >>>> Greg >>>> >>>> ---------- Forwarded message ---------- >>>> From: >>>> Date: Mon, May 8, 2017 at 8:29 PM >>>> Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt >>>> To: Gregory Mirsky >>>> >>>> >>>> >>>> A new version of I-D, draft-mirsky-spring-bfd-00.txt >>>> has been successfully submitted by Greg Mirsky and posted to the >>>> IETF repository. >>>> >>>> Name: draft-mirsky-spring-bfd >>>> Revision: 00 >>>> Title: Bidirectional Forwarding Detection (BFD) in Segment >>>> Routing Networks Using MPLS Dataplane >>>> Document date: 2017-05-08 >>>> Group: Individual Submission >>>> Pages: 7 >>>> URL: https://www.ietf.org/internet- >>>> drafts/draft-mirsky-spring-bfd-00.txt >>>> Status: https://datatracker.ietf.org/ >>>> doc/draft-mirsky-spring-bfd/ >>>> Htmlized: https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 >>>> Htmlized: https://datatracker.ietf.org/ >>>> doc/html/draft-mirsky-spring-bfd-00 >>>> >>>> >>>> Abstract: >>>> Segment Routing architecture leverages the paradigm of source >>>> routing. It can be realized in the Multiprotocol Label Switching >>>> (MPLS) network without any change to the data plane. A segment is >>>> encoded as an MPLS label and an ordered list of segments is encoded >>>> as a stack of labels. Bidirectional Forwarding Detection (BFD) is >>>> expected to monitor any kind of paths between systems. This docume= nt >>>> defines how to use Label Switched Path Ping to bootstrap and contro= l >>>> path in reverse direction of a BFD session on the Segment Routing >>>> network over MPLS dataplane. >>>> >>>> >>>> >>>> >>>> Please note that it may take a couple of minutes from the time of >>>> submission >>>> until the htmlized version and diff are available at tools.ietf.org. >>>> >>>> The IETF Secretariat >>>> >>>> >>>> _______________________________________________ >>>> mpls mailing list >>>> mpls@ietf.org >>>> https://www.ietf.org/mailman/listinfo/mpls >>>> >>>> >>>> >>> >>> >> >> > --001a114043b0731de7054f30aa83 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Never mind= .. I guess you made it up from "Target FEC Stack"= :)



On Wed, May 10, 2017 at 9:40 PM, Robert Ras= zuk <robert@raszuk.net> wrote:
Hi Carlos,

Sorry what is "TFS" ?=C2=A0

RFC 7110 does not even use su= ch abbreviation neither do=C2=A0draft-ietf-mpls-bfd-directed=C2=A0:) Google als= o seems to be pretty clueless about it.=C2=A0

<= /div>
Just curious as you keep using this term in each em= ail :)=C2=A0

Thx,
R= .

On Wed, May 10, 2017 at 9:24 PM, Carlos= Pignataro (cpignata) <cpignata@cisco.com> wrote:
Greg,

In the MPLS data plane, FECs are also instantiated through a label sta= ck. But RFC 7110 does not use numeric label values, it uses TFSs. That does= not create any additional state. E.g.,:=C2=A0https://w= ww.ietf.org/mail-archive/web/mpls/current/msg16091.html

Thanks,

=E2=80=94 Carlos.



On May 9, 2017, at 3:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

Hi Carlos,
I probably would characterize anything that starts with Why not as a t= echnical comment but rather as a question.
According to=C2=A0draft-ietf-spring-segment-routing-mpls, "= In the MPLS=C2=A0dat= aplane,the SR head= er is instantiated through a label stack".
At the same time, one of advantages of SR is that &= quot;per-flow state only [maintained] at the ingress node to the SR=C2=A0domain".
Thus, for the case of monitoring uni= directional SR tunnels, I consider that there's no need to create any a= dditional state on the egress node.
Of course, if there were bidirection= al SR tunnels, then control of the reverse direction of the BFD session wou= ld not require use of the Return Path sub-TLV.
As for LSP-Ping, I just propose that= the Segment Routing MPLS Tunnel sub-TLV MAY be used Reply Path TLV defined= in RFC 7110. I viewed the proposal as invitation to technical discussion.

Regards,
Greg

On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro= (cpignata) <cpignata@cisco.com> wrote:
Thank you Greg!

Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems quite= similar to the text removed at https://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-bfd-directe= d-05.txt, then the complete set of outstanding technical comments that = triggered the removal of that text from draft-ietf-mpls-bfd-directed-0= 5.txt might peek your interest :-)

One that I recall is: why use label values when every other return-pat= h sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directed,= uses TFSs?=C2=A0

Best,

=E2=80=94 Carlos.

On May 9, 2017, at 12:00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear Carlos,
I've decided to re-start the discussion and am interested to hear = technical comments to the proposed solution.=C2=A0

Regards,
Greg

On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro= (cpignata) <cpignata@cisco.com> wrote:
Dear Greg,

Cursorily scanning through this, it seems that most concerns raised an= d comments made about the SR sections of=C2=A0draft-ietf-mpls-bfd-directed-0N (with N < 5) apply to your new draft.

This is one of those:=C2=A0https://www.ietf.org/ma= il-archive/web/mpls/current/msg15860.html =E2=80=94 the list = archive shows a few more. The copy/paste did not address the comments.

Best,

=E2=80=94 Carlos.

On May 8, 2017, at 11:33 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear All,
perhaps this new draft may is of interest to you.
Your comments, suggestions are most welcome and greatly appreciated.

Regards,
Greg

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Mon, May 8, 2017 at 8:29 PM
Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt
To: Gregory Mirsky <gregimirsky@gmail.com>



A new version of I-D, draft-mirsky-spring-bfd-00.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mirsky-spring-bfd
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bidirectional Forwarding Detection= (BFD) in Segment Routing Networks Using MPLS Dataplane
Document date:=C2=A0 2017-05-08
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draft-mirsky-spring-bfd-00.t= xt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ht= tps://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://to= ols.ietf.org/html/draft-mirsky-spring-bfd-00
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0= https://datatracker.ietf.org/doc/html/draft-mirsky-spring-bfd-00<= /a>


Abstract:
=C2=A0 =C2=A0Segment Routing architecture leverages the paradigm of source<= br> =C2=A0 =C2=A0routing.=C2=A0 It can be realized in the Multiprotocol Label S= witching
=C2=A0 =C2=A0(MPLS) network without any change to the data plane.=C2=A0 A s= egment is
=C2=A0 =C2=A0encoded as an MPLS label and an ordered list of segments is en= coded
=C2=A0 =C2=A0as a stack of labels.=C2=A0 Bidirectional Forwarding Detection= (BFD) is
=C2=A0 =C2=A0expected to monitor any kind of paths between systems.=C2=A0 T= his document
=C2=A0 =C2=A0defines how to use Label Switched Path Ping to bootstrap and c= ontrol
=C2=A0 =C2=A0path in reverse direction of a BFD session on the Segment Rout= ing
=C2=A0 =C2=A0network over MPLS dataplane.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls







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FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Yllkkmvxjcs6; Wed, 10 May 2017 14:23:49 -0700 (PDT) Received: from mail-oi0-x232.google.com (mail-oi0-x232.google.com [IPv6:2607:f8b0:4003:c06::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3CD80128616; Wed, 10 May 2017 14:23:49 -0700 (PDT) Received: by mail-oi0-x232.google.com with SMTP id h4so9668819oib.3; Wed, 10 May 2017 14:23:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; 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X-Gm-Message-State: AODbwcAYWur589ELpMPazCuIdW44fONZ7qszcvOAUK9e/VUZx9wRhrOK wLxdvLEqOm9rwkygwx66GY5rx/WmEw== X-Received: by 10.157.47.70 with SMTP id h64mr3909430otb.23.1494451428547; Wed, 10 May 2017 14:23:48 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.52.246 with HTTP; Wed, 10 May 2017 14:23:48 -0700 (PDT) In-Reply-To: References: <149430058880.24107.8628199428997673992.idtracker@ietfa.amsl.com> <1C12E162-6B5C-4EF2-A3CB-3621C72BCFE9@cisco.com> <9D886964-6C21-427C-8733-7731D5A996D3@cisco.com> From: Greg Mirsky Date: Wed, 10 May 2017 14:23:48 -0700 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: Robert Raszuk , "mpls@ietf.org" , "spring@ietf.org" , "rtg-bfd@ietf.org" Content-Type: multipart/alternative; boundary=94eb2c04713888651a054f32160f Archived-At: Subject: Re: [spring] [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 May 2017 21:23:51 -0000 --94eb2c04713888651a054f32160f Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Carlos, RFC 7110 defined sub-TLVs by extensively re-using TFS sub-TLVs. Even more, they've referenced explanations of fields to the TFS-defining RFCs. I guess only Flags field was introduced in RFC 7110 with Primary and Secondary bit flag fields being defined. As, I've said in the discussion on BFD directed, this is proposal, it make sense to me as the head-end has all the information already. I always welcome technical comments and appreciate well-argumented discussion. What would be the reason not to use the proposed approach but do it TFS-like style? Regards, Greg On Wed, May 10, 2017 at 1:01 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > You are right =E2=80=94 sorry about that! =E2=80=9CTFS=E2=80=9D is not us= ed in any of those RFCs > or drafts, although it is used on email discussions about LSP Ping. > > Indeed, TFS for =E2=80=9CTarget FEC Stack=E2=80=9D from Section 3.2 of RF= C 8029. > > Thanks, > > =E2=80=94 Carlos. > > On May 10, 2017, at 3:41 PM, Robert Raszuk wrote: > > > Never mind .. I guess you made it up from "Target FEC Stack" :) > > > > On Wed, May 10, 2017 at 9:40 PM, Robert Raszuk wrote: > >> Hi Carlos, >> >> Sorry what is "TFS" ? >> >> RFC 7110 does not even use such abbreviation neither do >> draft-ietf-mpls-bfd-directed :) Google also seems to be pretty clueless >> about it. >> >> Just curious as you keep using this term in each email :) >> >> Thx, >> R. >> >> On Wed, May 10, 2017 at 9:24 PM, Carlos Pignataro (cpignata) < >> cpignata@cisco.com> wrote: >> >>> Greg, >>> >>> In the MPLS data plane, FECs are also instantiated through a label >>> stack. But RFC 7110 does not use numeric label values, it uses TFSs. Th= at >>> does not create any additional state. E.g.,: https://www.ietf.org/ma >>> il-archive/web/mpls/current/msg16091.html >>> >>> Thanks, >>> >>> =E2=80=94 Carlos. >>> >>> >>> >>> On May 9, 2017, at 3:43 PM, Greg Mirsky wrote: >>> >>> Hi Carlos, >>> I probably would characterize anything that starts with Why not as a >>> technical comment but rather as a question. >>> According to draft-ietf-spring-segment-routing-mpls, "In the MPLS >>> dataplane,the SR header is instantiated through a label stack". >>> At the same time, one of advantages of SR is that "per-flow state only >>> [maintained] at the ingress node to the SR domain". >>> Thus, for the case of monitoring unidirectional SR tunnels, I consider >>> that there's no need to create any additional state on the egress node. >>> Of course, if there were bidirectional SR tunnels, then control of the >>> reverse direction of the BFD session would not require use of the Retur= n >>> Path sub-TLV. >>> As for LSP-Ping, I just propose that the Segment Routing MPLS Tunnel >>> sub-TLV MAY be used Reply Path TLV defined in RFC 7110. I viewed the >>> proposal as invitation to technical discussion. >>> >>> Regards, >>> Greg >>> >>> On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro (cpignata) < >>> cpignata@cisco.com> wrote: >>> >>>> Thank you Greg! >>>> >>>> Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems >>>> quite similar to the text removed at https://tools.ietf.org/rfcdiff >>>> ?url2=3Ddraft-ietf-mpls-bfd-directed-05.txt, then the complete set of >>>> outstanding technical comments that triggered the removal of that text= from >>>> draft-ietf-mpls-bfd-directed-05.txt might peek your interest :-) >>>> >>>> One that I recall is: why use label values when every other return-pat= h >>>> sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-direct= ed, >>>> uses TFSs? >>>> >>>> Best, >>>> >>>> =E2=80=94 Carlos. >>>> >>>> On May 9, 2017, at 12:00 PM, Greg Mirsky wrote= : >>>> >>>> Dear Carlos, >>>> I've decided to re-start the discussion and am interested to hear >>>> technical comments to the proposed solution. >>>> >>>> Regards, >>>> Greg >>>> >>>> On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro (cpignata) < >>>> cpignata@cisco.com> wrote: >>>> >>>>> Dear Greg, >>>>> >>>>> Cursorily scanning through this, it seems that most concerns raised >>>>> and comments made about the SR sections of draft-ietf-mpls-bfd-direct= ed-0N >>>>> (with N < 5) apply to your new draft. >>>>> >>>>> This is one of those: https://www.ietf.org/ma >>>>> il-archive/web/mpls/current/msg15860.html =E2=80=94 the list archive = shows a >>>>> few more. The copy/paste did not address the comments. >>>>> >>>>> Best, >>>>> >>>>> =E2=80=94 Carlos. >>>>> >>>>> On May 8, 2017, at 11:33 PM, Greg Mirsky >>>>> wrote: >>>>> >>>>> Dear All, >>>>> perhaps this new draft may is of interest to you. >>>>> Your comments, suggestions are most welcome and greatly appreciated. >>>>> >>>>> Regards, >>>>> Greg >>>>> >>>>> ---------- Forwarded message ---------- >>>>> From: >>>>> Date: Mon, May 8, 2017 at 8:29 PM >>>>> Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt >>>>> To: Gregory Mirsky >>>>> >>>>> >>>>> >>>>> A new version of I-D, draft-mirsky-spring-bfd-00.txt >>>>> has been successfully submitted by Greg Mirsky and posted to the >>>>> IETF repository. >>>>> >>>>> Name: draft-mirsky-spring-bfd >>>>> Revision: 00 >>>>> Title: Bidirectional Forwarding Detection (BFD) in Segment >>>>> Routing Networks Using MPLS Dataplane >>>>> Document date: 2017-05-08 >>>>> Group: Individual Submission >>>>> Pages: 7 >>>>> URL: https://www.ietf.org/internet- >>>>> drafts/draft-mirsky-spring-bfd-00.txt >>>>> Status: https://datatracker.ietf.org/ >>>>> doc/draft-mirsky-spring-bfd/ >>>>> Htmlized: https://tools.ietf.org/html/draft-mirsky-spring-bfd-0= 0 >>>>> Htmlized: https://datatracker.ietf.org/ >>>>> doc/html/draft-mirsky-spring-bfd-00 >>>>> >>>>> >>>>> Abstract: >>>>> Segment Routing architecture leverages the paradigm of source >>>>> routing. It can be realized in the Multiprotocol Label Switching >>>>> (MPLS) network without any change to the data plane. A segment is >>>>> encoded as an MPLS label and an ordered list of segments is encode= d >>>>> as a stack of labels. Bidirectional Forwarding Detection (BFD) is >>>>> expected to monitor any kind of paths between systems. This >>>>> document >>>>> defines how to use Label Switched Path Ping to bootstrap and contr= ol >>>>> path in reverse direction of a BFD session on the Segment Routing >>>>> network over MPLS dataplane. >>>>> >>>>> >>>>> >>>>> >>>>> Please note that it may take a couple of minutes from the time of >>>>> submission >>>>> until the htmlized version and diff are available at tools.ietf.org. >>>>> >>>>> The IETF Secretariat >>>>> >>>>> >>>>> _______________________________________________ >>>>> mpls mailing list >>>>> mpls@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/mpls >>>>> >>>>> >>>>> >>>> >>>> >>> >>> >> > > --94eb2c04713888651a054f32160f Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Carlos,
RFC 7110 defined sub-TLVs by extensively re= -using TFS sub-TLVs. Even more, they've referenced explanations of fiel= ds to the TFS-defining RFCs. I guess only Flags field was introduced in RFC= 7110 with Primary and Secondary bit flag fields being defined.
<= br>
As, I've said in the discussion on BFD directed, this is = proposal, it make sense to me as the head-end has all the information alrea= dy. I always welcome technical comments and appreciate well-argumented disc= ussion. What would be the reason not to use the proposed approach but do it= TFS-like style?

Regards,
Greg

On Wed, May 10,= 2017 at 1:01 PM, Carlos Pignataro (cpignata) <cpignata@cisco.com>= wrote:
You are right =E2=80=94 sorry about that! =E2=80=9CTFS=E2=80=9D is not used= in any of those RFCs or drafts, although it is used on email discussions a= bout LSP Ping.

Indeed, TFS for =E2=80=9CTarget FEC Stack=E2=80=9D from Section 3.2 of= RFC=C2=A08029.

Thanks,

=E2=80=94 Carlos.

On May 10, 2017, at 3:41 PM, Robert Raszuk <robert@raszuk.net> wrote:


Never mind .. I guess you made it up from "Target FEC Stack" :)<= /div>



On Wed, May 10, 2017 at 9:40 PM, Robert Raszuk <= span dir=3D"ltr"> <robert@raszuk.ne= t> wrote:
Hi Carlos,

Sorry what is "TFS" ?=C2=A0

RFC 7110 does not even use such abbreviation neither do=C2=A0draft-ietf-mpls-bfd-directed=C2=A0:) Google also seems to be pretty clueless about it.=C2=A0<= /div>

Just curious as you keep using this term in each email :)=C2=A0

Thx,
R.

On Wed, May 10, 2017 at 9:24 PM, Carlos Pignatar= o (cpignata) <cpignata@cisco.com> wrote:
Greg,

In the MPLS data plane, FECs are also instantiated through a label sta= ck. But RFC 7110 does not use numeric label values, it uses TFSs. That does= not create any additional state. E.g.,:=C2=A0https://w= ww.ietf.org/mail-archive/web/mpls/current/msg16091.html

Thanks,

=E2=80=94 Carlos.



On May 9, 2017, at 3:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

Hi Carlos,
I probably would characterize anything that starts with Why not as a t= echnical comment but rather as a question.
According to=C2=A0draft-ietf-spring-segment-routing-mpls, "= In the MPLS=C2=A0dat= aplane,the SR head= er is instantiated through a label stack".
At the same time, one of advantages of SR is that &= quot;per-flow state only [maintained] at the ingress node to the SR=C2=A0domain".
Thus, for the case of monitoring uni= directional SR tunnels, I consider that there's no need to create any a= dditional state on the egress node.
Of course, if there were bidirection= al SR tunnels, then control of the reverse direction of the BFD session wou= ld not require use of the Return Path sub-TLV.
As for LSP-Ping, I just propose that= the Segment Routing MPLS Tunnel sub-TLV MAY be used Reply Path TLV defined= in RFC 7110. I viewed the proposal as invitation to technical discussion.=

Regards,
Greg

On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro= (cpignata) <cpignata@cisco.com> wrote:
Thank you Greg!

Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems quite= similar to the text removed at https://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-bfd-directe= d-05.txt, then the complete set of outstanding technical comments that = triggered the removal of that text from draft-ietf-mpls-bfd-directed-0= 5.txt might peek your interest :-)

One that I recall is: why use label values when every other return-pat= h sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directed,= uses TFSs?=C2=A0

Best,

=E2=80=94 Carlos.

On May 9, 2017, at 12:00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear Carlos,
I've decided to re-start the discussion and am interested to hear = technical comments to the proposed solution.=C2=A0

Regards,
Greg

On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro= (cpignata) <cpignata@cisco.com> wrote:
Dear Greg,

Cursorily scanning through this, it seems that most concerns raised an= d comments made about the SR sections of=C2=A0draft-ietf-mpls-bfd-directed-0N (with N < 5) apply to your new draft.

This is one of those:=C2=A0https://www.ietf.org/ma= il-archive/web/mpls/current/msg15860.html =E2=80=94 the list = archive shows a few more. The copy/paste did not address the comments.

Best,

=E2=80=94 Carlos.

On May 8, 2017, at 11:33 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear All,
perhaps this new draft may is of interest to you.
Your comments, suggestions are most welcome and greatly appreciated.

Regards,
Greg

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Mon, May 8, 2017 at 8:29 PM
Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt
To: Gregory Mirsky <gregimirsky@gmail.com>



A new version of I-D, draft-mirsky-spring-bfd-00.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mirsky-spring-bfd
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bidirectional Forwarding Detection= (BFD) in Segment Routing Networks Using MPLS Dataplane
Document date:=C2=A0 2017-05-08
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draft-mirsky-spring-bfd-00.t= xt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ht= tps://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://to= ols.ietf.org/html/draft-mirsky-spring-bfd-00
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0= https://datatracker.ietf.org/doc/html/draft-mirsky-spring-bfd-00<= /a>


Abstract:
=C2=A0 =C2=A0Segment Routing architecture leverages the paradigm of source<= br> =C2=A0 =C2=A0routing.=C2=A0 It can be realized in the Multiprotocol Label S= witching
=C2=A0 =C2=A0(MPLS) network without any change to the data plane.=C2=A0 A s= egment is
=C2=A0 =C2=A0encoded as an MPLS label and an ordered list of segments is en= coded
=C2=A0 =C2=A0as a stack of labels.=C2=A0 Bidirectional Forwarding Detection= (BFD) is
=C2=A0 =C2=A0expected to monitor any kind of paths between systems.=C2=A0 T= his document
=C2=A0 =C2=A0defines how to use Label Switched Path Ping to bootstrap and c= ontrol
=C2=A0 =C2=A0path in reverse direction of a BFD session on the Segment Rout= ing
=C2=A0 =C2=A0network over MPLS dataplane.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls









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b=dQmjqh3sJNda+5Od0vvtmYuZDTMaNzlTe1YFFk6f6U7f2PQv6vTRUuN6hAaLPrJJhJ9o+pt2gHCgIN0ELv2PaualMZx9G8YquKFTFrXM7FjoVi929khfYWcnizj4lWn14xRHFR3hCUWB67AXwFHjbyH6+VsyhITYkTKf0c7tbbs= Received: from AM4PR03MB1713.eurprd03.prod.outlook.com (10.167.88.15) by AM3PR03MB1025.eurprd03.prod.outlook.com (10.163.5.147) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1075.11; Thu, 11 May 2017 10:04:01 +0000 Received: from AM4PR03MB1713.eurprd03.prod.outlook.com ([fe80::bd82:f003:4b3a:acf1]) by AM4PR03MB1713.eurprd03.prod.outlook.com ([fe80::bd82:f003:4b3a:acf1%15]) with mapi id 15.01.1075.020; Thu, 11 May 2017 10:04:01 +0000 From: Alexander Vainshtein To: "draft-ietf-spring-resliency-use-cases@ietf.org" CC: "spring@ietf.org" , Michael Gorokhovsky , Rotem Cohen , Sidd Aanand , Ron Sdayoor , Shell Nakash Thread-Topic: A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases Thread-Index: AdLKMfwZZp8yu5h/Ra+WsEpPtv/h+g== 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ecitele.com X-MS-Exchange-CrossTenant-originalarrivaltime: 11 May 2017 10:04:01.2522 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2c514a61-08de-4519-b4c0-921fef62c42a X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM3PR03MB1025 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 May 2017 10:04:16 -0000 --_000_AM4PR03MB1713393C262301279EAF29039DED0AM4PR03MB1713eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, I have a belated (but hopefully late is still better than never) comment o= n path protection as defined in Section 2 of the draft. This second para in this section says: A first protection strategy consists in excluding any local repair but instead use end-to-end path protection where each SPRING path is protected by a second disjoint SPRING path. In this case local protection MUST NOT be used. First of all, I do not think that RFC 2119 language should be used in Info= rmational documents, especially in the documents that describe use cases. In addition, I specifically disagree with the quoted statement above, beca= use, from my POV: * Local repair and end-to-end path protection can be combined for = the same path * Such a combination may be beneficial for the operators. One possible way to combine the two is described below: 1. A pair of SR paths is set up between the given two nodes - later = referred to as source and destination - in the network. These paths are "= SR-disjoint" in the sense that their "explicit routes" do not have any co= mmon elements, be they nodes or adjacencies, with exclusion of the final d= estination 2. Local repair for these paths is enabled in the network. It is tri= ggered by locally observed events (link failures etc.), applied by the nod= es adjacent to the failure and guarantees that, in the case of a link or n= ode failure that is not specified in the explicit route, traffic along the= affected path would be restored within milliseconds 3. End-to-end liveness monitoring is enabled for the two SR paths, a= nd detects end-to-end failures of these paths within milliseconds wher= e Y >> X. In other words, end-to-end liveness monitoring for these paths w= ill ignore any failures that local repair can fix, but will detect failure= s that cannot be locally repaired (e.g., failures of nodes or links that h= ave been specified in the explicit route of one of the paths 4. End-to-end liveness monitoring triggers end-to-end path protectio= n to be applied by the source node in the following way: a. If it recognizes both paths as alive, one of them will carry the = customer traffic, while the other one will be idle. The rules for selectin= g the active path in this scenario may vary b. If end-to-end failure of one of these paths is detected while the = other one remains alive, traffic will be carried across the live path c. If end-to-end failure of both paths is detected (e.g., if the fin= al destination node fails, or if the network is partitioned), this is reco= gnized as an unrecoverable failure. >From my POV the combination of local repair and end-to-end protection for = SR paths is one of a few possibilities to protect such paths against failu= res of nodes and/or links that have been specified in their explicit route= s. (Another option has been described in Node Protection for SR-TE Paths, but this draft has expired). Do I miss something substantial? Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this=20 transmission in error, please inform us by e-mail, phone or fax, and then = delete the original=20 and all copies thereof. __________________________________________________________________________= _ --_000_AM4PR03MB1713393C262301279EAF29039DED0AM4PR03MB1713eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

I have a belated (but hopefully late is still bette= r than never) comment on path protection as defined in Section 2 of the draft.

 

This second para in this section says:

   A first protection strategy consists in excluding any = local repair

   but instead use end-to-end path protection where each = SPRING path is

   protected by a second disjoint SPRING path.  In t= his case local

   protection MUST NOT be used.

First of all, I do not think that RFC 2119 language= =20should be used in Informational documents, especially in the documents = that describe use cases.

 

In addition, I specifically disagree with the quote= d statement above, because, from my POV:

·         Local repair and e= nd-to-end path protection can be combined for the same path

=

·         Such a combination= may be beneficial for the operators.

 

One possible way to combine the two is described be= low:

 

1.    &nbs= p;  A pair of SR paths is set= up between the given two nodes – later referred to as source and de= stination -  in the network. These paths are “SR-disjoint”= ; in the sense that their “explicit routes”  do not have = any common elements, be they nodes or adjacencies, with exclusion of the fina= l destination

2.    &nbs= p;  Local repair for these pa= ths is enabled in the network. It is triggered by locally observed events = (link failures etc.), applied by the nodes adjacent to the failure and gua= rantees that, in the case of a link or node failure that is not specified in the explicit route, traffic along t= he affected path would be restored within <X> milliseconds

3.    &nbs= p;  End-to-end liveness monit= oring is enabled for the two SR paths, and detects end-to-end failures of = these paths within <Y> milliseconds where Y >> X. In other wor= ds, end-to-end liveness monitoring for these paths will ignore any failures that local repair can fix, but will detect failu= res that cannot be locally repaired (e.g., failures of nodes or links that= have been specified in the explicit route of one of the paths<= /p>

4.    &nbs= p;  End-to-end liveness monit= oring triggers end-to-end path protection to be applied by the source node= in the following way:

a.       If it recognizes both pat= hs as alive, one of them will carry the customer traffic, while the other = one will be idle. The rules for selecting the active path in this scenario= may vary

b.      If end-to-end failure of = one of these paths is detected while the other one remains alive, traffic = will be carried across the live path

c.       If end-to-end failure of = both paths is detected (e.g., if the final destination node fails, or if t= he network is partitioned), this is recognized as an unrecoverable failure= .

 

From my POV the combination of local repair and end= -to-end protection for SR paths is one of a few possibilities to protect s= uch paths against failures of nodes and/or links that have been specified = in their explicit routes. (Another option has been described in Node Protection for SR-TE Paths, = but this draft has expired).

 

Do I miss something substantial?

 

Regards,

Sasha

 

Office: +972-39266302

Cell:      +972-549266= 302

Email:   Alexander.Vainshtein@ecitele.com=

 


__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original
and all copies thereof.
__________________________________________________________________________= _
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Thu, 11 May 2017 11:30:08 +0000 From: Alexander Vainshtein To: Eric C Rosen , "Les Ginsberg (ginsberg)" , Shraddha Hegde , "draft-ietf-spring-conflict-resolution@ietf.org" CC: "spring@ietf.org" Thread-Topic: [spring] Mail regarding draft-ietf-spring-conflict-resolution Thread-Index: AdLEK6gAqg4DUgoVTleNTb+KJq8tswADTO5AABYn9bAAG8P6sAEmPUKAACvt9OA= Date: Thu, 11 May 2017 11:30:08 +0000 Message-ID: References: <97e3921eb1014725a484156d96191570@XCH-ALN-001.cisco.com> <7e54eb8d-7b13-0022-694b-c2f3be7e1654@juniper.net> In-Reply-To: <7e54eb8d-7b13-0022-694b-c2f3be7e1654@juniper.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.234.241.1] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; AM4PR03MB1715; 7:/86xPU6EP7n4Gngn/s/MC9MEdvgkrXcWlbKWAxU/hePl9skz27iR8adION1YVeuRrl2kwRTQ5I2RYgXuJVWmncqqbTO6oaBRfV0niW1eEv12S95BO8cAqZiaJQvaXvnzk9ir5IYAEaZaFAcdPBO5LHMlUB96MwVE6bzMjaMu31eab70jdB/kSEVlnfC1aOKcyzzltjgRDoT8boLU31B01t1GgRPW7ms8AKc/yxie2n9bFrdoXAE+rF/HkhYYTpl0Ihm4KqBXqNA9FgLcd/zx/vhmkCfHx0Wdm0Kc9r45Z+77ZwobcLSggnrqfeAgd65ICf8/yKf7eNhIedPgk75sfQ== x-ms-office365-filtering-correlation-id: 4446222e-3294-444b-1a97-08d498611422 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:; 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DIR:OUT; SFP:1102; SCL:1; SRVR:AM4PR03MB1715; H:AM4PR03MB1713.eurprd03.prod.outlook.com; FPR:; SPF:None; MLV:sfv; LANG:en; spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_AM4PR03MB17132125F7F77D7D0D4B19DD9DED0AM4PR03MB1713eurp_" MIME-Version: 1.0 X-OriginatorOrg: ecitele.com X-MS-Exchange-CrossTenant-originalarrivaltime: 11 May 2017 11:30:08.1330 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2c514a61-08de-4519-b4c0-921fef62c42a X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR03MB1715 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 May 2017 11:32:50 -0000 --_000_AM4PR03MB17132125F7F77D7D0D4B19DD9DED0AM4PR03MB1713eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, I concur with Eric that the only reasonable default for SR over MPLS (and = for MPLS in general) should be "No PHP". Specifically, from my POV, if a SR-capable node with SGB base and Node= SID receives a labeled packet with top label , this label MUST b= e terminated regardless of whether the node did or did not advertise PHP. I wonder whether this has ever been explicitly specified in one of the SR = documents. Do I miss something? Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Eric C Rosen Sent: Wednesday, May 10, 2017 5:27 PM To: Les Ginsberg (ginsberg) ; Shraddha Hegde ; draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution= On 5/4/2017 2:35 PM, Les Ginsberg (ginsberg) wrote: When G forwards the packet to A, because A has not advertised the=20prefix= -SID (but is SR capable) we do not know whether it wants PHP or not - so w= e have to make an assumption. Default MPLS behavior is to assume PHP. I'm not sure why you think there is such a thing as "default MPLS behavior= " in this regard. In conventional MPLS, when a node advertises the bindin= g of a label to a FEC, PHP will not occur unless the advertised label is I= mplicit NULL. If you advertise a different label, you don't get PHP. If there were any such thing as a default behavior for MPLS, it wouldn't m= ake any sense for PHP to be the default behavior. You can only advertise= Implicit NULL if you know that the packet can be properly processed after= the top label is popped off. Whether PHP will give the right result is a= pplication-specific. So if there were a default behavior, it would have t= o be "don't do PHP". But of course MPLS has no need of such a default beh= avior, because each node advertises its own labels. Since the segment routing architecture allows cases where you don't know w= hether=20the next hop wants you to pop the stack or not, segment routing n= eeds to have a default, and the only sensible default is "don't do PHP". = This should be stated in whatever document discusses the use of the MPLS d= ata plane for segment routing. I don't see that there is any issue for th= e MPLS WG. If A does not want PHP then it would have to advertise the prefix SID so i= t could specify desired behavior using P/E flags. A default of "do PHP" doesn't seem sensible, as it may result in the expos= ure of a label at a node that cannot process it properly. Historically, MPLS implementations have chosen a default behavior (equiva= lent to P and E flags =3D 0). Some implementations provide knobs to overri= de this behavior. I wonder if you're thinking about the case where the next hop has advertis= ed Implicit NULL for a particular FEC, but the current hop actually uses E= xplicit NULL in order to have a place to put the TC field, which would oth= erwise be lost when PHP is done. That doesn't really seem relevant to the= issue that Shraddha raised. If your concern is that there is not an explicit definition of default PHP= /Explicit NULL behavior, then I think this needs to be directed at the MPL= S WG. I think this is incorrect, as explained above. I do not claim to be an MPLS expert, but I have found these references: RFC 3036 Section 6 "- Section 2.16 of the MPLS architecture [RFC3031] requires that the initial label distribution protocol negotiation between peer LSRs enable each LSR to determine whether its peer is capable of popping the label stack. This version of LDP assumes that LSRs support label popping for all link types except ATM and Frame Relay. A future version may specify means to make this determination part of the session initiation negotiation." Well, you don't have to be an MPLS expert to notice that RFC3036 was obsol= eted ten years ago ;-) In any event, the above quote is not relevant. It simply says that when u= sing LDP, an LSR may assume, for most data link types, that an LDP peer is= capable of popping the top label off the stack. Thus it is allowable to = advertise to the peer a binding of Implicit NULL to a FEC. This is an iss= ue for LDP, but there is no way to apply the quoted passage to segment rou= ting. This really needs to be addressed in some SPRING draft or other. __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this=20 transmission in error, please inform us by e-mail, phone or fax, and then = delete the original=20 and all copies thereof. __________________________________________________________________________= _ --_000_AM4PR03MB17132125F7F77D7D0D4B19DD9DED0AM4PR03MB1713eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

I concur with Eric that the only re= asonable default for SR over MPLS (and for MPLS in general) should be R= 20;No PHP”.

Specifically, from my POV, if a SR-= capable node with SGB base <B> and Node SID <S> receives a lab= eled packet with top label <B+S>, this label MUST be terminated regardless of whether the node did or did not advertise PHP.=

 

I wonder whether this has ever been= explicitly specified in one of the SR documents.

 

Do I miss something?

 

Regards,

Sasha

 

Office: +972-39266302

Cell:     = +972-549266302

Email:   Alexander.Vainsh= tein@ecitele.com

 

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Eric C Rosen
Sent: Wednesday, May 10, 2017 5:27 PM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; Shraddha He= gde <shraddha@juniper.net>; draft-ietf-spring-conflict-resolution@ie= tf.org
Cc: spring@ietf.org
Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-res= olution

 

On 5/4/2017 2:35 PM, Les Ginsberg (ginsberg) wrote:=


When G forwards the packet to A, be= cause A has not advertised the prefix-SID (but is SR capable) we do not kn= ow whether it wants PHP or not – so we have to make an assumption.

Default MPLS behavior is to assume = PHP.


I'm not sure why you think there is such a thing as "default MPLS beh= avior" in this regard.  In conventional MPLS, when a node advert= ises the binding of a label to a FEC, PHP will not occur unless the advert= ised label is Implicit NULL.   If you advertise a different label, you don't get PHP.

If there were any such thing as a default behavior for MPLS, it wouldn't m= ake any sense for PHP to be the default behavior.   You can only= advertise Implicit NULL if you know that the packet can be properly proce= ssed after the top label is popped off.  Whether PHP will give the right result is application-specific.  So if there= were a default behavior, it would have to be "don't do PHP".&nb= sp; But of course MPLS has no need of such a default behavior, because eac= h node advertises its own labels.

Since the segment routing architecture allows cases where you don't know w= hether the next hop wants you to pop the stack or not, segment routing nee= ds to have a default, and the only sensible default is "don't do PHP&= quot;.  This should be stated in whatever document discusses the use of the MPLS data plane for segment routing.  I don= 't see that=20there is any issue for the MPLS WG.


If A does not want PHP then it woul= d have to advertise the prefix SID so it could specify desired behavior us= ing P/E flags.


A default of "do PHP" doesn't seem sensible, as it may result in= the exposure of a label at a node that cannot process it properly. 


 

Historically,  MPLS implementa= tions have chosen a default behavior (equivalent to P and E flags =3D 0). = Some implementations provide knobs to override this behavior.<= /o:p>


I wonder if you're thinking about the case where the next hop has advertis= ed Implicit NULL for a particular FEC, but the current hop actually uses E= xplicit NULL in order to have a place to put the TC field, which would oth= erwise be lost when PHP is done.  That doesn't really seem relevant to the issue that Shraddha raised.

 

If your concern is that there is no= t an explicit definition of default PHP/Explicit NULL behavior, then I thi= nk this needs to be directed at the MPLS WG.


I think this is incorrect, as explained above.


I do not claim to be an MPLS expert= , but I have found these references:

 

RFC 3036 Section 6

 

“-  Section 2.16 of the = MPLS architecture [RFC3031] requires that

      = ;   the initial label distribution protocol negotiation between<= /span>

      = ;   peer LSRs enable each LSR to determine whether its peer is

      = ;   capable of popping the label stack.  This version of LD= P

      = ;   assumes that LSRs support label popping for all link types

      = ;   except ATM and Frame Relay.  A future version may speci= fy means

      = ;   to make this determination part of the session initiation

      = ;   negotiation.”

 


Well, you don't have to be an MPLS expert to notice that RFC3036 was obsol= eted ten years ago ;-)

In any event, the above quote is not relevant.  It simply says that w= hen using LDP, an LSR may assume, for most data link types, that an LDP pe= er is capable of popping the top label off the stack.  Thus it is all= owable to advertise to the peer a binding of Implicit NULL to a FEC.  This is an issue for LDP, but there is no w= ay to apply the quoted passage to segment routing.

This really needs to be addressed in some SPRING draft or other.


__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original
and all copies thereof.
__________________________________________________________________________= _
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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 May 2017 13:56:37 -0000 --------------8FBC4EFDDE207DBF17C0EF0F Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit On 5/11/2017 7:30 AM, Alexander Vainshtein wrote: > Specifically, from my POV, if a SR-capable node with SGB base and > Node SID receives a labeled packet with top label , this > label MUST be terminated */regardless of whether the node did or did > not advertise PHP/*. This seems like it might be too strong a requirement. If the node is expecting PHP, I don't think it is reasonable to expect it to set up its data plane forwarding structures to handle both the PHP and the non-PHP case. We might also question the statement that Les made: "[if] there is no advertisement of P/E for any of the destinations. It must follow a default behavior [when deciding whether to use PHP]". Proper operation of the system seems to require that everyone knows when to do PHP and when not to do it. If all the progamming of the data plane is done by a controller, it has to program the nodes consistently. If the programming of the data plane is done by a control plane, and control plane errors or config errors cause inconsistent programming of the data plane, it would be nice if there were some way of detecting this and perhaps taking some deterministic remedial action. While the scenario under discussion is not, strictly speaking, a "SID conflict", it does have a strong resemblance to the SID conflict case, in that the control plane is advertising an inconsistency that is likely to break things. --------------8FBC4EFDDE207DBF17C0EF0F Content-Type: text/html; charset="windows-1252" Content-Transfer-Encoding: 8bit On 5/11/2017 7:30 AM, Alexander Vainshtein wrote:
Specifically, from my POV, if a SR-capable node with SGB base <B> and Node SID <S> receives a labeled packet with top label <B+S>, this label MUST be terminated regardless of whether the node did or did not advertise PHP.

This seems like it might be too strong a requirement. If the node is expecting PHP, I don't think it is reasonable to expect it to set up its data plane forwarding structures to handle both the PHP and the non-PHP case.

We might also question the statement that Les made: "[if] there is no advertisement of P/E for any of the destinations. It must follow a default behavior [when deciding whether to use PHP]".

Proper operation of the system seems to require that everyone knows when to do PHP and when not to do it. If all the progamming of the data plane is done by a controller, it has to program the nodes consistently. If the programming of the data plane is done by a control plane, and control plane errors or config errors cause inconsistent programming of the data plane, it would be nice if there were some way of detecting this and perhaps taking some deterministic remedial action. While the scenario under discussion is not, strictly speaking, a "SID conflict", it does have a strong resemblance to the SID conflict case, in that the control plane is advertising an inconsistency that is likely to break things.


--------------8FBC4EFDDE207DBF17C0EF0F-- From nobody Fri May 12 16:59:22 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5123612EAF5; Fri, 12 May 2017 16:59:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.511 X-Spam-Level: X-Spam-Status: No, score=-14.511 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FmRdaOzjE8xA; Fri, 12 May 2017 16:59:19 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 211FC1243F3; Fri, 12 May 2017 16:55:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=21534; q=dns/txt; s=iport; t=1494633359; x=1495842959; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=8nl5XSTiIRFbjALi6SLlbBdJZzHH7nOBVpXEH5zaLcc=; b=XByDeN0uzww8ExWv5GTZdltR8hllihGIg4fsNS6QsQhW6U1azxjHABcQ S2MqLeJULYKC0L0Zeu2JQpjBdvrDRyCJMBGOoUSud5DSVoqXZh4ei1kLS 3tmU0IdVjO0IyMl3JZdWT/cR6m4Mvy2CpQF/GalZKOjdVC4mZ2bQUmOPo g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CaAACpShZZ/5JdJa1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm5nYoEMB418kV+VdIIPhiQChRk/GAECAQEBAQEBAWsohRgBAQE?= =?us-ascii?q?BAy0+DhACAQgRAQMBASgHMhQDBggBAQQBDQUIihuxISuKIAEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBAR2GX4FegxuENBECAVGFPAWWb4cbAYpQgyyFFYImj06UQgEfOH8?= =?us-ascii?q?LcBWFPByBY3aHXoENAQEB?= X-IronPort-AV: E=Sophos;i="5.38,332,1491264000"; d="scan'208,217";a="247745439" Received: from rcdn-core-10.cisco.com ([173.37.93.146]) by rcdn-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 May 2017 23:55:57 +0000 Received: from XCH-ALN-001.cisco.com (xch-aln-001.cisco.com [173.36.7.11]) by rcdn-core-10.cisco.com (8.14.5/8.14.5) with ESMTP id v4CNtv4U028903 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 12 May 2017 23:55:57 GMT Received: from xch-rcd-001.cisco.com (173.37.102.11) by XCH-ALN-001.cisco.com (173.36.7.11) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 12 May 2017 18:55:56 -0500 Received: from xch-rcd-001.cisco.com ([173.37.102.11]) by XCH-RCD-001.cisco.com ([173.37.102.11]) with mapi id 15.00.1210.000; Fri, 12 May 2017 18:55:56 -0500 From: "Les Ginsberg (ginsberg)" To: Eric C Rosen , Shraddha Hegde , "draft-ietf-spring-conflict-resolution@ietf.org" CC: "spring@ietf.org" Thread-Topic: [spring] Mail regarding draft-ietf-spring-conflict-resolution Thread-Index: AdLEK6gAqg4DUgoVTleNTb+KJq8tswADTO5AABYn9bAAG8P6sAEwt3eAAG2sr7A= Date: Fri, 12 May 2017 23:55:56 +0000 Message-ID: <712183ebf3394ec597f7285addc068c2@XCH-RCD-001.cisco.com> References: <97e3921eb1014725a484156d96191570@XCH-ALN-001.cisco.com> <7e54eb8d-7b13-0022-694b-c2f3be7e1654@juniper.net> In-Reply-To: <7e54eb8d-7b13-0022-694b-c2f3be7e1654@juniper.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.8.220] Content-Type: multipart/alternative; boundary="_000_712183ebf3394ec597f7285addc068c2XCHRCD001ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 May 2017 23:59:21 -0000 --_000_712183ebf3394ec597f7285addc068c2XCHRCD001ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Eric - First I want to say that this input is exactly what I was hoping to get. Thanx. We also had concluded that the issue of default PHP behavior is applicable = to SR-MPLS precisely because advertisements are globally scoped. As it is= possible in some circumstances (SRMS advertisement on behalf of an SR capa= ble node is the most practical example) that explicit indication of the des= ired PHP behavior is not advertised a default behavior is required. We are assuming a default behavior of PHP for SR-MPLS. If folks believe thi= s requires explicit specification I would propose language similar to the f= ollowing: "When Segment Routing is instantiated over the MPLS data plane the penultim= ate node performs the NEXT operation (i.e., MPLS pop) unless a specific ind= ication to do otherwise is advertised by the ultimate node." As to why we are choosing PHP rather than UHP as the default, it is our bel= ief that most of the platforms which support MPLS today have been implement= ed to take advantage of the optimizations that PHP affords. In some cases i= t may even be true that UHP is not supported at all. Of course if UHP is re= quired prefix-SID advertisements provide the means to indicate this. I hope this resolves the issue. (NOTE: I will discuss the issue of anycast advertisements w/wo a SID in a s= eparate email) Les From: Eric C Rosen [mailto:erosen@juniper.net] Sent: Wednesday, May 10, 2017 7:27 AM To: Les Ginsberg (ginsberg); Shraddha Hegde; draft-ietf-spring-conflict-res= olution@ietf.org Cc: spring@ietf.org Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution On 5/4/2017 2:35 PM, Les Ginsberg (ginsberg) wrote: When G forwards the packet to A, because A has not advertised the prefix-SI= D (but is SR capable) we do not know whether it wants PHP or not - so we ha= ve to make an assumption. Default MPLS behavior is to assume PHP. I'm not sure why you think there is such a thing as "default MPLS behavior"= in this regard. In conventional MPLS, when a node advertises the binding = of a label to a FEC, PHP will not occur unless the advertised label is Impl= icit NULL. If you advertise a different label, you don't get PHP. If there were any such thing as a default behavior for MPLS, it wouldn't ma= ke any sense for PHP to be the default behavior. You can only advertise I= mplicit NULL if you know that the packet can be properly processed after th= e top label is popped off. Whether PHP will give the right result is appli= cation-specific. So if there were a default behavior, it would have to be = "don't do PHP". But of course MPLS has no need of such a default behavior,= because each node advertises its own labels. Since the segment routing architecture allows cases where you don't know wh= ether the next hop wants you to pop the stack or not, segment routing needs= to have a default, and the only sensible default is "don't do PHP". This = should be stated in whatever document discusses the use of the MPLS data pl= ane for segment routing. I don't see that there is any issue for the MPLS = WG. If A does not want PHP then it would have to advertise the prefix SID so it= could specify desired behavior using P/E flags. A default of "do PHP" doesn't seem sensible, as it may result in the exposu= re of a label at a node that cannot process it properly. Historically, MPLS implementations have chosen a default behavior (equival= ent to P and E flags =3D 0). Some implementations provide knobs to override= this behavior. I wonder if you're thinking about the case where the next hop has advertise= d Implicit NULL for a particular FEC, but the current hop actually uses Exp= licit NULL in order to have a place to put the TC field, which would otherw= ise be lost when PHP is done. That doesn't really seem relevant to the iss= ue that Shraddha raised. If your concern is that there is not an explicit definition of default PHP/= Explicit NULL behavior, then I think this needs to be directed at the MPLS = WG. I think this is incorrect, as explained above. I do not claim to be an MPLS expert, but I have found these references: RFC 3036 Section 6 "- Section 2.16 of the MPLS architecture [RFC3031] requires that the initial label distribution protocol negotiation between peer LSRs enable each LSR to determine whether its peer is capable of popping the label stack. This version of LDP assumes that LSRs support label popping for all link types except ATM and Frame Relay. A future version may specify means to make this determination part of the session initiation negotiation." Well, you don't have to be an MPLS expert to notice that RFC3036 was obsole= ted ten years ago ;-) In any event, the above quote is not relevant. It simply says that when us= ing LDP, an LSR may assume, for most data link types, that an LDP peer is c= apable of popping the top label off the stack. Thus it is allowable to adv= ertise to the peer a binding of Implicit NULL to a FEC. This is an issue f= or LDP, but there is no way to apply the quoted passage to segment routing. This really needs to be addressed in some SPRING draft or other. --_000_712183ebf3394ec597f7285addc068c2XCHRCD001ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Eric -<= /p>

 <= /p>

First I want to say that = this input is exactly what I was hoping to get.

Thanx.<= /p>

 <= /p>

We also had concluded tha= t the issue of default PHP behavior is applicable to SR-MPLS precisely beca= use  advertisements are globally scoped.  As it is possible in some circumstances (SRMS advertisement on behalf of an SR capable node = is the most practical example) that explicit indication of the desired PHP = behavior is not advertised a default behavior is required.

 <= /p>

We are assuming a default= behavior of PHP for SR-MPLS. If folks believe this requires explicit speci= fication I would propose language similar to the following:

 <= /p>

"When Segment Routing is instantiated over the MPLS data plane th= e penultimate node performs the NEXT operation (i.e., MPLS pop) unless a specific indication to do otherwise is advertised by the ultimate= node."

 <= /p>

As to why we are choosing= PHP rather than UHP as the default, it is our belief that most of the plat= forms which support MPLS today have been implemented to take advantage of the optimizations that PHP affords. In some cases it may= even be true that UHP is not supported at all. Of course if UHP is require= d prefix-SID advertisements provide the means to indicate this.<= /span>

 <= /p>

I hope this resolves the = issue.

 <= /p>

(NOTE: I will discuss the= issue of anycast advertisements w/wo a SID in a separate email)=

 <= /p>

   Les

 <= /p>

From: Eric C Rosen [mailto:erosen@juniper.net]
Sent: Wednesday, May 10, 2017 7:27 AM
To: Les Ginsberg (ginsberg); Shraddha Hegde; draft-ietf-spring-confl= ict-resolution@ietf.org
Cc: spring@ietf.org
Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-reso= lution

 

On 5/4/2017 2:35 PM, Les Ginsberg (ginsberg) wrote:<= br>

When G forwards the packe= t to A, because A has not advertised the prefix-SID (but is SR capable) we = do not know whether it wants PHP or not – so we have to make an assumption.

Default MPLS behavior is = to assume PHP.


I'm not sure why you think there is such a thing as "default MPLS beha= vior" in this regard.  In conventional MPLS, when a node advertis= es the binding of a label to a FEC, PHP will not occur unless the advertise= d label is Implicit NULL.   If you advertise a different label, you don't get PHP.

If there were any such thing as a default behavior for MPLS, it wouldn't ma= ke any sense for PHP to be the default behavior.   You can only a= dvertise Implicit NULL if you know that the packet can be properly processe= d after the top label is popped off.  Whether PHP will give the right result is application-specific.  So if there = were a default behavior, it would have to be "don't do PHP". = ; But of course MPLS has no need of such a default behavior, because each n= ode advertises its own labels.

Since the segment routing architecture allows cases where you don't know wh= ether the next hop wants you to pop the stack or not, segment routing needs= to have a default, and the only sensible default is "don't do PHP&quo= t;.  This should be stated in whatever document discusses the use of the MPLS data plane for segment routing.  I don'= t see that there is any issue for the MPLS WG.


If A does not want PHP th= en it would have to advertise the prefix SID so it could specify desired be= havior using P/E flags.


A default of "do PHP" doesn't seem sensible, as it may result in = the exposure of a label at a node that cannot process it properly. 


 <= /p>

Historically,  MPLS = implementations have chosen a default behavior (equivalent to P and E flags= =3D 0). Some implementations provide knobs to override this behavior.


I wonder if you're thinking about the case where the next hop has advertise= d Implicit NULL for a particular FEC, but the current hop actually uses Exp= licit NULL in order to have a place to put the TC field, which would otherw= ise be lost when PHP is done.  That doesn't really seem relevant to the issue that Shraddha raised.

 <= /p>

If your concern is that t= here is not an explicit definition of default PHP/Explicit NULL behavior, t= hen I think this needs to be directed at the MPLS WG.


I think this is incorrect, as explained above.


I do not claim to be an M= PLS expert, but I have found these references:

 <= /p>

RFC 3036 Section 6=

 <= /p>

“-  Section 2.= 16 of the MPLS architecture [RFC3031] requires that

    &= nbsp;    the initial label distribution protocol negotiation= between

    &= nbsp;    peer LSRs enable each LSR to determine whether its = peer is

    &= nbsp;    capable of popping the label stack.  This vers= ion of LDP

    &= nbsp;    assumes that LSRs support label popping for all lin= k types

    &= nbsp;    except ATM and Frame Relay.  A future version = may specify means

    &= nbsp;    to make this determination part of the session init= iation

    &= nbsp;    negotiation.”

 <= /p>


Well, you don't have to be an MPLS expert to notice that RFC3036 was obsole= ted ten years ago ;-)

In any event, the above quote is not relevant.  It simply says that wh= en using LDP, an LSR may assume, for most data link types, that an LDP peer= is capable of popping the top label off the stack.  Thus it is allowa= ble to advertise to the peer a binding of Implicit NULL to a FEC.  This is an issue for LDP, but there is no wa= y to apply the quoted passage to segment routing.

This really needs to be addressed in some SPRING draft or other.=

--_000_712183ebf3394ec597f7285addc068c2XCHRCD001ciscocom_-- From nobody Fri May 12 17:31:30 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6BA26129437; Fri, 12 May 2017 17:31:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.521 X-Spam-Level: X-Spam-Status: No, score=-14.521 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Q-goMX8SOToL; Fri, 12 May 2017 17:31:24 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3B99F12EC0B; Fri, 12 May 2017 17:28:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=14673; q=dns/txt; s=iport; t=1494635305; x=1495844905; h=from:to:cc:subject:date:message-id:mime-version; bh=bzfvozMS/uDY3Vrpx09bCfHCBZ6CWu+xxyA20pxAbzk=; b=m496UWMPnmS5t62lfQyep9bXKcgOvTXk6bdHt4Sp/5mjL9q5ITKQbpMX LhqWQKs26ath1Pv3I9aOzcBB9ZziW+S+r/ki6j8eX+YvGaeLHUu1c0FUM BkLNqy2pkqMB+8zESNLZDa7hZsw5js87R2LIYTqgi21s41M6trvjgyk3w 8=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CaAAClUhZZ/4UNJK1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm48K2KBDAeNfKIbhTiCD4YkAoUZPxgBAgEBAQEBAQFrKIUYAQE?= =?us-ascii?q?yTBIBGQQBASg5FAkJAQQBDQUIihuxLopLAQEBAQEBAQEBAQEBAQEBAQEBAQEBH?= =?us-ascii?q?YZfgV6HYQEBUYU8BZZvhxsBgVqRN4INj2eIf4tDAR84WTFwFYU8HIFjdoY9gSG?= =?us-ascii?q?BDQEBAQ?= X-IronPort-AV: E=Sophos; i="5.38,332,1491264000"; d="scan'208,217"; a="26770241" Received: from alln-core-11.cisco.com ([173.36.13.133]) by rcdn-iport-5.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 13 May 2017 00:28:24 +0000 Received: from XCH-RCD-002.cisco.com (xch-rcd-002.cisco.com [173.37.102.12]) by alln-core-11.cisco.com (8.14.5/8.14.5) with ESMTP id v4D0SOMf021626 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Sat, 13 May 2017 00:28:24 GMT Received: from xch-rcd-001.cisco.com (173.37.102.11) by XCH-RCD-002.cisco.com (173.37.102.12) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 12 May 2017 19:28:23 -0500 Received: from xch-rcd-001.cisco.com ([173.37.102.11]) by XCH-RCD-001.cisco.com ([173.37.102.11]) with mapi id 15.00.1210.000; Fri, 12 May 2017 19:28:23 -0500 From: "Les Ginsberg (ginsberg)" To: Shraddha Hegde , "draft-ietf-spring-conflict-resolution@ietf.org" CC: "spring@ietf.org" , Eric C Rosen Thread-Topic: Anycast and SID Conflict Resolution Thread-Index: AdLLfQvLPPmZZz8IRSuxQBafhaLTFg== Date: Sat, 13 May 2017 00:28:23 +0000 Message-ID: <4329eddc04804871a4e2d906265a5d87@XCH-RCD-001.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.8.220] Content-Type: multipart/alternative; boundary="_000_4329eddc04804871a4e2d906265a5d87XCHRCD001ciscocom_" MIME-Version: 1.0 Archived-At: Subject: [spring] Anycast and SID Conflict Resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 May 2017 00:31:27 -0000 --_000_4329eddc04804871a4e2d906265a5d87XCHRCD001ciscocom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable (Changing subject - was "Mail regarding draft-ietf-spring-conflict-resoluti= on") Shraddha/Eric - Although the conflict resolution draft is not yet in its final form, there = are some basic principles which have not changed across the various version= s: 1)Who advertised a SID plays no role in conflict resolution 2)All nodes agree on which mapping entries are Active(MAY be used in forwar= ding) and which are Inactive (MUST NOT be used in forwarding) 3)Whether the Active entry is consistent w local configuration is not relev= ant The scenario you describe below: Node X advertises address A with SID S Node Y advertises address A with no SID This is not a conflict. It may represent a misconfiguration - but this does not matter to conflict = resolution. How could this legitimately happen? The operator may be introducing (or withdrawing) use of an SRMS. Addition o= r removal of local SID configuration may simply be in transition. How could this be a misconfiguration? Address A was not intended to be an anycast address and was incorrectly con= figured on Node Y. (Other possibilities exist) The conflict resolution procedures make no attempt to determine which entri= es are "right" and which entries are "wrong". A database is built of all ad= vertised mapping entries, the conflict resolution policy is applied, and a = set of Active/Inactive entries result. All SR capable nodes MUST use that o= utput when programming forwarding entries. All that conflict resolution is = trying to achieve is consistent behavior in the forwarding plane. Les From: Shraddha Hegde [mailto:shraddha@juniper.net] Sent: Wednesday, May 03, 2017 9:58 AM To: draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Mail regarding draft-ietf-spring-conflict-resolution Hi Authors, When there are multiple anycast IP addresses assigned to different nodes an= d one or more nodes do not advertise a Prefix SID for that anycast address but other nodes adve= rtise a prefix-sid, there is a possibility of different implementations behaving differently with respect to programmi= ng the labelled routes. This scenario should be considered as a prefix conflict and the behavior sh= ould be addressed in the draft. I suggest to update section 3.2.1 with the relevant text to describe the be= havior. Rgds Shraddha --_000_4329eddc04804871a4e2d906265a5d87XCHRCD001ciscocom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

(Changing subject –= was “Mail regarding draft-ietf-spring-conflict-resolution”)

 <= /p>

Shraddha/Eric –

 <= /p>

Although the conflict res= olution draft is not yet in its final form, there are some basic principles= which have not changed across the various versions:

 <= /p>

1)Who advertised a SID pl= ays no role in conflict resolution

2)All nodes agree on whic= h mapping entries are Active(MAY be used in forwarding) and which are Inact= ive (MUST NOT be used in forwarding)

3)Whether the Active entr= y is consistent w local configuration is not relevant

 <= /p>

The scenario you describe= below:

 <= /p>

Node X advertises address= A with SID S

Node Y advertises address= A with no SID

 <= /p>

This is not a conflict.

It may represent a miscon= figuration – but this does not matter to conflict resolution.

 <= /p>

How could this legitimate= ly happen?

The operator may be intro= ducing (or withdrawing) use of an SRMS. Addition or removal of local SID co= nfiguration may simply be in transition.

 <= /p>

How could this be a misco= nfiguration?

Address A was not intende= d to be an anycast address and was incorrectly configured on Node Y.

 <= /p>

(Other possibilities exis= t)

 <= /p>

The conflict resolution p= rocedures make no attempt to determine which entries are “right”= ; and which entries are “wrong”. A database is built of all adv= ertised mapping entries, the conflict resolution policy is applied, and a set of A= ctive/Inactive entries result. All SR capable nodes MUST use that output wh= en programming forwarding entries. All that conflict resolution is trying t= o achieve is consistent behavior in the forwarding plane.

 <= /p>

   Les

 <= /p>

 <= /p>

From: Shraddha= Hegde [mailto:shraddha@juniper.net]
Sent: Wednesday, May 03, 2017 9:58 AM
To: draft-ietf-spring-conflict-resolution@ietf.org
Cc: spring@ietf.org
Subject: Mail regarding draft-ietf-spring-conflict-resolution

 

Hi Authors,

 

 

When there are multiple anycast IP addr= esses assigned to different nodes and one or more nodes

do not advertise a Prefix SID for that = anycast address but other nodes advertise a prefix-sid, there is a possibil= ity

of different implementations behaving d= ifferently with respect to programming the labelled routes.

 

This scenario should be considered as a= prefix conflict and the behavior should be addressed in the draft.

I suggest to update section 3.2.1 with = the relevant text to describe the behavior.

 

 

Rgds

Shraddha

 

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(PDT) MIME-Version: 1.0 Received: by 10.157.52.246 with HTTP; Tue, 16 May 2017 01:18:44 -0700 (PDT) From: Greg Mirsky Date: Tue, 16 May 2017 16:18:44 +0800 Message-ID: To: draft-bardhan-spring-poi-sr-oam@ietf.org Cc: spring@ietf.org Content-Type: multipart/alternative; boundary="001a113d75a6fd2ffc054f9fd1a9" Archived-At: Subject: [spring] Requirements towards OAM in Segment Routing network X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 08:22:49 -0000 --001a113d75a6fd2ffc054f9fd1a9 Content-Type: text/plain; charset="UTF-8" Dear Authors, I'd like to bring your attention to the WG document OAM Requirements for Segment Routing Network . I think that many requirements listed in your document are common requirements for OAM in Segment Routing network listed in the above mentioned document. Kind regards, Greg --001a113d75a6fd2ffc054f9fd1a9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear Authors,
I'd like to bring your attention to = the WG document=C2=A0OAM Requirements fo= r Segment Routing Network. I think that many requirements listed in you= r document are common requirements for OAM in Segment Routing network liste= d in the above mentioned document.

Kind regards,
Greg
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h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=1uf7cDz0viJ32GAFnMb50cKFdZfc+VXryyzzyljypWo=; b=cRSLOcGs5EKZ6Uk6PwqUxQJtL6mpU1dn+z9Q5lv1ax18XEZ6VEdnZI7z8oeUPlAMpW Q9wCbhY9+tLrpYK3JB5qtJLvhPIOhDdaoTK6oK31cZp8em1MfP1zY7NIOP9PzFS8/cGl A1CoTpsApf/SvpWsxdYxj2iiCB67geax6N/Tkj8e+PfqqK5q5B+9TFAJ3+LnPwb57CfC V8VJmry26KPjo6azKUZowHL8qZk8CL8zzvonSfUYjXEcsJLKb84TOWAcIMJrE4RSWljz qnjebLHLvkix62DMMTPVROBbRUtJF97FHNNPLGAQEJ1Y60gAOZbW9ZWXgYUZvUISnKyc 3lAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=1uf7cDz0viJ32GAFnMb50cKFdZfc+VXryyzzyljypWo=; b=VEDdipO2Y1I7tcvzDsprRJvdIDPeQqVuzBktJpfhz/v9LAXV9FN93mrzPaX5TbMZ3I XTLagCGwxdrLByJ9SK75qJL33TowGqIo6WPsrQNFUbHfFfue5Mh9b+HfxehqCXYx6aCP KiYmndOkfowvXXHQeymlWyfhUurby7w0M96bRmA7FsEek1h2R5Rm3NSSIX0YtGI0dTjt OY6rRFXHsPxTBrt8AzWBLw7moNPE3yIGiQrXMZf/+TIS5nyB9JVsfhIIk/Y6xdhs8tLu CbVrblI0Z9J84cyHvbZkwPZmljtUNCjhlBaRFnU8D32NABvHzB4J5GBuWzut+6jtRZ0r PhVA== X-Gm-Message-State: AODbwcBeaVcCnBFkm+q9SDJHxi62S7eznL733U8W86Ix8NH5i9V9d2Vh 7KH1YS3GiKy8Nxju91I211DDHCboCA== X-Received: by 10.107.5.132 with SMTP id 126mr8987172iof.186.1494924800442; Tue, 16 May 2017 01:53:20 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.79.62.24 with HTTP; Tue, 16 May 2017 01:53:19 -0700 (PDT) Received: by 10.79.62.24 with HTTP; Tue, 16 May 2017 01:53:19 -0700 (PDT) In-Reply-To: References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> From: Robert Raszuk Date: Tue, 16 May 2017 10:53:19 +0200 X-Google-Sender-Auth: -qDxGI344Cs54LhuYIiGTDo8FMs Message-ID: To: Alexander Vainshtein Cc: Michael Gorokhovsky , Shell Nakash , "Stefano Previdi (sprevidi)" , Sidd Aanand , Ron Sdayoor , "draft-ietf-spring-resliency-use-cases@ietf.org" , "spring@ietf.org" , Rotem Cohen Content-Type: multipart/alternative; boundary="001a113efcf6b27bc1054fa04d3a" Archived-At: Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 08:56:56 -0000 --001a113efcf6b27bc1054fa04d3a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Sasha, You said: "Path protection cannot be applied to shortest traffic paths so they must rely on local protection" What makes you think that way ? Only one specific use case of SR is TE. And could even argue that it is not the most important one. Adding protection to shortest traffic paths with TILFA is a very valid use case for SR. Another one is use of SR for VPNs. End to end path will still be shortest from IGP pov yet SR header will be present. Cheers R. On May 16, 2017 4:31 AM, "Alexander Vainshtein" < Alexander.Vainshtein@ecitele.com> wrote: > Stefano, > > Lots of thanks for a prompt response. > > > > A couple of short comments if you do not mind: > > > > *Using 2119 language in a "use cases" document*: > > 1. Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 m= ean that the > definition is an absolute prohibition of the specification=E2=80=9D > > 2. I agree that the use case document defines which scenarios > should be addressed, but I do not see how it can impose an absolute > prohibition on a certain scenario. > > > > *Little sense link protection has in the case of path protection*: > > 1. This was definitely correct for traditional traffic engineering > because the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) cou= ld be easily > differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D. > > 2. In addition, traditional local protection (e.g., MPLS FRR using > RSVP-TE) could deal with link and node failures regardless of whether the > failed link or node appeared in the ERO of the protected path. > > 3. IMHO and FWIW, with SR the situation is quite different: > > o The shortest traffic paths not only coexist with engineered traffic > paths: the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the= former. > > o Path protection cannot be applied to shortest traffic paths so they > must rely on local protection > > o Local protection in the case of failure of a node or link that > appears in the ERO of an engineered SR path is highly non-trivial at best= , > so path protection for the engineered LSPs looks like a preferred solutio= n > to me. > > I fully agree with you that the operators deploying SR should provide > feedback on this point based on actual operational experience. > > Meanwhile I doubt that *a priori* declaring some use cases as absolutely > prohibited is the right thing to do. > > > > My 2c, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > > > -----Original Message----- > From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com] > Sent: Monday, May 15, 2017 11:12 AM > To: Alexander Vainshtein > Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > Subject: Re: [spring] A belated comment on end-to-end path protection in > draft-ietf-spring-resiliency-use-cases > > > > > > > On May 11, 2017, at 12:04 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Hi all, > > > I have a belated (but hopefully late is still better than never) commen= t > on path protection as defined in Section 2 of the draft. > > > > > > This second para in this section says: > > > A first protection strategy consists in excluding any local repair > > > > > > but instead use end-to-end path protection where each SPRING path > > > is > > > > > > protected by a second disjoint SPRING path. In this case local > > > > > > protection MUST NOT be used. > > > > > > First of all, I do not think that RFC 2119 language should be used in > Informational documents, especially in the documents that describe use > cases. > > > > > > this document is also a requirements document for the resiliency use-case= . > RFC2119 terminology is perfectly usable and even more, it adds clarity on > what the solution is expected to provide. > > > > > > > In addition, I specifically disagree with the quoted statement above, > because, from my POV: > > > =C2=B7 Local repair and end-to-end path protection can be combi= ned > for the same path > > > =C2=B7 Such a combination may be beneficial for the operators. > > > > > > are you talking by experience or is it just something that came into your > mind ? I=E2=80=99d like to hear from operators using a combination of pat= h and link > protection. > > > > This document has been deeply reviewed also by operators and it has been > always obvious the little sense link protection has in case of path > protection. > > > > > > > One possible way to combine the two is described below: > > > > > > 1. A pair of SR paths is set up between the given two nodes =E2= =80=93 > later referred to as source and destination - in the network. These path= s > are =E2=80=9CSR-disjoint=E2=80=9D in the sense that their =E2=80=9Cexplic= it routes=E2=80=9D do not have > any common elements, be they nodes or adjacencies, with exclusion of the > final destination > > > 2. Local repair for these paths is enabled in the network. It is > triggered by locally observed events (link failures etc.), applied by the > nodes adjacent to the failure and guarantees that, in the case of a link = or > node failure that is not specified in the explicit route, traffic along t= he > affected path would be restored within milliseconds > > > 3. End-to-end liveness monitoring is enabled for the two SR paths= , > and detects end-to-end failures of these paths within milliseconds > where Y >> X. In other words, end-to-end liveness monitoring for these > paths will ignore any failures that local repair can fix, but will detect > failures that cannot be locally repaired (e.g., failures of nodes or link= s > that have been specified in the explicit route of one of the paths > > > 4. End-to-end liveness monitoring triggers end-to-end path > protection to be applied by the source node in the following way: > > > a. If it recognizes both paths as alive, one of them will carry > the customer traffic, while the other one will be idle. The rules for > selecting the active path in this scenario may vary > > > b. If end-to-end failure of one of these paths is detected while > the other one remains alive, traffic will be carried across the live path > > > c. If end-to-end failure of both paths is detected (e.g., if the > final destination node fails, or if the network is partitioned), this is > recognized as an unrecoverable failure. > > > > > > From my POV the combination of local repair and end-to-end protection > for SR paths is one of a few possibilities to protect such paths against > failures of nodes and/or links that have been specified in their explicit > routes. (Another option has been described in Node Protection for SR-TE > Paths, but this draft has expired). > > > > > > Do I miss something substantial? > > > > > > to my view you created a use-case that doesn=E2=80=99t bring much to the = picture > but I=E2=80=99d let operators to comment. > > > > s. > > > > > > > > > > Regards, > > > Sasha > > > > > > Office: +972-39266302 <+972%203-926-6302> > > > Cell: +972-549266302 <+972%2054-926-6302> > > > Email: Alexander.Vainshtein@ecitele.com > > > > > > > > > ______________________________________________________________________ > > > _____ > > > > > > This e-mail message is intended for the recipient only and contains > > > information which is CONFIDENTIAL and which may be proprietary to ECI > > > Telecom. If you have received this transmission in error, please > > > inform us by e-mail, phone or fax, and then delete the original and all > copies thereof. > > > ______________________________________________________________________ > > > _____ _______________________________________________ > > > spring mailing list > > > spring@ietf.org > > > https://www.ietf.org/mailman/listinfo/spring > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > --001a113efcf6b27bc1054fa04d3a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Sasha,

Yo= u said:

=C2=A0"Path protection cannot be applied to short= est traffic paths so they must rely on local protection"

What makes you think that way ?

Only one specific use case of= SR is TE. And could even argue that it is not the most important one.

Adding protection to shortest = traffic paths with TILFA is a very valid use case for SR.

Another one is use of SR for VPNs. End to e= nd path will still be shortest from IGP pov yet SR header will be present.<= /span>

Cheers
R.


On May 16, 2017 4:31 AM, "Alexander = Vainshtein" <Al= exander.Vainshtein@ecitele.com> wrote:

Stefano,

Lots of thanks for a prompt = response.

=C2=A0

A couple of short comments i= f you do not mind:

=C2=A0

Using 2119 language in= a "use cases" document:

1.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Going back to the source I se= e that =E2=80=9CMUST NOT=E2=80=A6 mean that the definition is an absolute p= rohibition of the specification=E2=80=9D

2.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I agree that the use case doc= ument defines which scenarios should be addressed, but I do not see how it = can impose an absolute prohibition on a certain scenario.

=C2=A0

Little sense link prot= ection has in the case of path protection:

1.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This was definitely correct f= or traditional traffic engineering because the =E2=80=9Cshortest traffic pa= ths=E2=80=9D (e.g., LDL PSPs) could be easily differentiated from the =E2= =80=9Cengineered traffic paths=E2=80=9D.

2.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 In addition, traditional loca= l protection (e.g., MPLS FRR using RSVP-TE) could deal with link and node f= ailures regardless of whether the failed link or node appeared in the ERO o= f the protected path.

3.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 IMHO and FWIW, with SR=C2=A0 = the situation is quite different:

o=C2=A0=C2=A0 The shortest traffic p= aths not only coexist with engineered traffic paths: the latter are in many= cases =E2=80=9Ctunneled=E2=80=9D within the former.

o=C2=A0=C2=A0 Path protection cannot= be applied to shortest traffic paths so they must rely on local protection=

o=C2=A0=C2=A0 Local protection in th= e case of failure of a node or link that appears in the ERO of an engineere= d SR path is highly non-trivial at best, so path protection for the enginee= red LSPs looks like a preferred solution to me.

I fully agree with you that the operators deploying SR should provide feed= back on this point based on actual operational experience.

Meanwhile I doubt that a priori declaring some use cases as absolut= ely prohibited is the right thing to do.

=C2=A0

My 2c,

Sasha

=C2=A0

Office: +972-39266302=

Cell:=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexander.Va= inshtein@ecitele.com

=C2=A0

=C2=A0

-----Original Message----- From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]
Sent: Monday, May 15, 2017 11:12 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell = Nakash <Sh= ell.Nakash@ecitele.com>; Michael Gorokhovsky <Michael.Gorokhovsky@ecite= le.com>; Sidd Aanand <Sidd.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecite= le.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases

=C2=A0

=C2=A0

> On May 11, 2017, at 12:= 04 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:=

>

> Hi all,

> I have a belated (but h= opefully late is still better than never) comment on path protection as def= ined in Section 2 of the draft.

>=C2=A0

> This second para in thi= s section says:

>=C2=A0=C2=A0=C2=A0 A fir= st protection strategy consists in excluding any local repair=

>

>=C2=A0=C2=A0=C2=A0 but i= nstead use end-to-end path protection where each SPRING path

> is

>

>=C2=A0=C2=A0=C2=A0 prote= cted by a second disjoint SPRING path.=C2=A0 In this case local

>

>=C2=A0=C2=A0=C2=A0 prote= ction MUST NOT be used.

>

> First of all, I do not = think that RFC 2119 language should be used in Informational documents, esp= ecially in the documents that describe use cases.

=C2=A0

=C2=A0

this document is also a requ= irements document for the resiliency use-case. RFC2119 terminology is perfe= ctly usable and even more, it adds clarity on what the solution is expected= to provide.

=C2=A0

=C2=A0

> In addition, I specific= ally disagree with the quoted statement above, because, from my POV:=

> =C2=B7=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Local repair and end-to-end path protecti= on can be combined for the same path

> =C2=B7=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Such a combination may be beneficial for = the operators.

=C2=A0

=C2=A0

are you talking by experienc= e or is it just something that came into your mind ? I=E2=80=99d like to he= ar from operators using a combination of path and link protection.

=C2=A0

This document has been deepl= y reviewed also by operators and it has been always obvious the little sens= e link protection has in case of path protection.

=C2=A0

=C2=A0

> One possible way to com= bine the two is described below:

>=C2=A0

> 1.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 A pair of SR paths is set up between the given two nodes = =E2=80=93 later referred to as source and destination -=C2=A0 in the networ= k. These paths are =E2=80=9CSR-disjoint=E2=80=9D in the sense that their = =E2=80=9Cexplicit routes=E2=80=9D=C2=A0 do not have any common elements, be they nodes or adjacencies, with exclusion of the final destination

> 2.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Local repair for these paths is enabled in the network. It = is triggered by locally observed events (link failures etc.), applied by th= e nodes adjacent to the failure and guarantees that, in the case of a link = or node failure that is not specified in the explicit route, traffic along the affected pa= th would be restored within <X> milliseconds

> 3.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 End-to-end liveness monitoring is enabled for the two SR pa= ths, and detects end-to-end failures of these paths within <Y> millis= econds where Y >> X. In other words, end-to-end liveness monitoring f= or these paths will ignore any failures that local repair can fix, but will detect failures that cann= ot be locally repaired (e.g., failures of nodes or links that have been spe= cified in the explicit route of one of the paths

> 4.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 End-to-end liveness monitoring triggers end-to-end path pro= tection to be applied by the source node in the following way:

> a.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 If it recognizes both paths as alive, one of them will carr= y the customer traffic, while the other one will be idle. The rules for sel= ecting the active path in this scenario may vary

> b.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 If end-to-end failure of one of these paths is detected while the= other one remains alive, traffic will be carried across the live path

> c.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 If end-to-end failure of both paths is detected (e.g., if t= he final destination node fails, or if the network is partitioned), this is= recognized as an unrecoverable failure.

>=C2=A0

> From my POV the combina= tion of local repair and end-to-end protection for SR paths is one of a few= possibilities to protect such paths against failures of nodes and/or links= that have been specified in their explicit routes. (Another option has been described in Node Protection for SR-TE Paths, but this dra= ft has expired).

>=C2=A0

> Do I miss something sub= stantial?

=C2=A0

=C2=A0

to my view you created a use= -case that doesn=E2=80=99t bring much to the picture but I=E2=80=99d let op= erators to comment.

=C2=A0

s.

=C2=A0

=C2=A0

>=C2=A0

> Regards,<= /p>

> Sasha

>=C2=A0

> Office: +972-39266302

> Cell:=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 +972-549266302

> Email:=C2=A0=C2=A0 Alexander.Vainshtein@= ecitele.com

>=C2=A0

>

> _______________________= _______________________________________________

> _____

>

> This e-mail message is = intended for the recipient only and contains

> information which is CO= NFIDENTIAL and which may be proprietary to ECI

> Telecom. If you have re= ceived this transmission in error, please

> inform us by e-mail, ph= one or fax, and then delete the original and all copies thereof.<= /u>

> _______________________= _______________________________________________

> _____ _________________= ______________________________

> spring mailing list<= /u>

> spring@ietf.org

> https://www.ietf.org/= mailman/listinfo/spring

=C2=A0


_________________________________________________________________= __________

This e-mail message is intended for the recipient only and contains informa= tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this
transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original
and all copies thereof.
_________________________________________________________________= __________

_______________________________________________
spring mailing list
spring@ietf.org
https://www.ietf.org/mailman/listinfo/spring
--001a113efcf6b27bc1054fa04d3a-- From nobody Tue May 16 02:32:37 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B4AE71294FF; Tue, 16 May 2017 02:32:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.378 X-Spam-Level: X-Spam-Status: No, score=-5.378 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-2.8, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01, T_KAM_HTML_FONT_INVALID=0.01, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RCY4ayMBRpR1; Tue, 16 May 2017 02:32:32 -0700 (PDT) Received: from relais-inet.orange.com (mta136.mail.business.static.orange.com [80.12.70.36]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CBDD3129C46; Tue, 16 May 2017 02:29:26 -0700 (PDT) Received: from opfednr04.francetelecom.fr (unknown [xx.xx.xx.68]) by opfednr23.francetelecom.fr (ESMTP service) with ESMTP id 21193C2CC3; Tue, 16 May 2017 11:29:25 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.21]) by opfednr04.francetelecom.fr (ESMTP service) with ESMTP id A8CC640070; Tue, 16 May 2017 11:29:24 +0200 (CEST) Received: from OPEXCLILMA4.corporate.adroot.infra.ftgroup ([fe80::65de:2f08:41e6:ebbe]) by OPEXCLILM6C.corporate.adroot.infra.ftgroup ([fe80::d9f5:9741:7525:a199%18]) with mapi id 14.03.0339.000; Tue, 16 May 2017 11:29:24 +0200 From: To: Alexander Vainshtein , "Stefano Previdi (sprevidi)" CC: "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen Thread-Topic: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases Thread-Index: AdLKMfwZZp8yu5h/Ra+WsEpPtv/h+gDQnJYAAClgXmAAAR1WkAAB8nrw Date: Tue, 16 May 2017 09:29:23 +0000 Message-ID: <30960_1494926964_591AC674_30960_1681_1_9E32478DFA9976438E7A22F69B08FF921DDBA294@OPEXCLILMA4.corporate.adroot.infra.ftgroup> References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.5] Content-Type: multipart/alternative; boundary="_000_9E32478DFA9976438E7A22F69B08FF921DDBA294OPEXCLILMA4corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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(amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kIy0AH-p584B; Tue, 16 May 2017 02:37:37 -0700 (PDT) Received: from mail-oi0-x232.google.com (mail-oi0-x232.google.com [IPv6:2607:f8b0:4003:c06::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AAA09129412; Tue, 16 May 2017 02:34:25 -0700 (PDT) Received: by mail-oi0-x232.google.com with SMTP id h4so18006909oib.3; Tue, 16 May 2017 02:34:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=GwRZn4R9VpYyDfqVO5i8JUeplMr/6mCxMsi3wrUH30U=; b=CrSjcFThomYvZhibZQ4JqGzLtweBJFZ+LkkmqG/9hP5djZGNyDLinuXK8qRsq/vj9w aeVWyXm+bg/bLvbBlJL1S+t8IXB/ltcMU/lg5nSd+HZPNxnRQezMswdst0O8BWF5ccE2 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2017 02:34:24 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.25.169 with HTTP; Tue, 16 May 2017 02:34:24 -0700 (PDT) In-Reply-To: References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> From: Muthu Arul Mozhi Perumal Date: Tue, 16 May 2017 15:04:24 +0530 Message-ID: To: Alexander Vainshtein Cc: "Stefano Previdi (sprevidi)" , "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen Content-Type: multipart/alternative; boundary="001a113d3594971f52054fa0e05d" Archived-At: Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 09:37:41 -0000 --001a113d3594971f52054fa0e05d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Using end-to-end path protection together with local protection can result in traffic loops. Consider the foll. topology: B-----C | / \ | / \ | / \ | / \D----+ A/ Z (CE) \ F----+ \ / \ / \ / \E/ - All links are of equal cost. - A, D and F are BGP peers. - Z is a dual-homed CE. A resolves its BGP next-hop D over the SR-TE tunnel T1. T1: A->B, B->C, C->D (loosely routed) Suppose A has enabled end-to-end path protection over tunnel T1 and B has TI-LFA enabled, and the detection timers are configured as described in your previous email. If the BC link goes down, B will immediately start rerouting the traffic via A (in FRR fashion) creating a loop b/w A and B. A solution would be to make the A-B link ineligible for TI-LFA backup computation at B. However, managing this network-wide could become operational expensive. Hence, deploying one of end-to-end path protection or local protection with sufficiently short detection timers keeps things simple, IMHO. Regards, Muthu On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtein < Alexander.Vainshtein@ecitele.com> wrote: > > > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Alexander Vainshtein > *Sent:* Tuesday, May 16, 2017 11:28 AM > *To:* 'Stefano Previdi (sprevidi)' > *Cc:* draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > *Subject:* RE: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Stefano, > > Lots of thanks for a prompt response. > > > > A couple of short comments if you do not mind: > > > > *Using 2119 language in a "use cases" document*: > > 1. Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 m= ean that the > definition is an absolute prohibition of the specification=E2=80=9D > > 2. I agree that the use case document defines which scenarios > should be addressed, but I do not see how it can impose an absolute > prohibition on a certain scenario. > > > > *Little sense link protection has in the case of path protection*: > > 1. This was definitely correct for traditional traffic engineering > because the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) cou= ld be easily > differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D. > > 2. In addition, traditional local protection (e.g., MPLS FRR using > RSVP-TE) could deal with link and node failures regardless of whether the > failed link or node appeared in the ERO of the protected path. > > 3. IMHO and FWIW, with SR the situation is quite different: > > o The shortest traffic paths not only coexist with engineered traffic > paths: the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the= former. > > o Path protection cannot be applied to shortest traffic paths so they > must rely on local protection > > o Local protection in the case of failure of a node or link that > appears in the ERO of an engineered SR path is highly non-trivial at best= , > so path protection for the engineered LSPs looks like a preferred solutio= n > to me. > > I fully agree with you that the operators deploying SR should provide > feedback on this point based on actual operational experience. > > Meanwhile I doubt that *a priori* declaring some use cases as absolutely > prohibited is the right thing to do. > > > > My 2c, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > > > -----Original Message----- > From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com > ] > Sent: Monday, May 15, 2017 11:12 AM > To: Alexander Vainshtein > Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > Subject: Re: [spring] A belated comment on end-to-end path protection in > draft-ietf-spring-resiliency-use-cases > > > > > > > On May 11, 2017, at 12:04 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Hi all, > > > I have a belated (but hopefully late is still better than never) commen= t > on path protection as defined in Section 2 of the draft. > > > > > > This second para in this section says: > > > A first protection strategy consists in excluding any local repair > > > > > > but instead use end-to-end path protection where each SPRING path > > > is > > > > > > protected by a second disjoint SPRING path. In this case local > > > > > > protection MUST NOT be used. > > > > > > First of all, I do not think that RFC 2119 language should be used in > Informational documents, especially in the documents that describe use > cases. > > > > > > this document is also a requirements document for the resiliency use-case= . > RFC2119 terminology is perfectly usable and even more, it adds clarity on > what the solution is expected to provide. > > > > > > > In addition, I specifically disagree with the quoted statement above, > because, from my POV: > > > =C2=B7 Local repair and end-to-end path protection can be combi= ned > for the same path > > > =C2=B7 Such a combination may be beneficial for the operators. > > > > > > are you talking by experience or is it just something that came into your > mind ? I=E2=80=99d like to hear from operators using a combination of pat= h and link > protection. > > > > This document has been deeply reviewed also by operators and it has been > always obvious the little sense link protection has in case of path > protection. > > > > > > > One possible way to combine the two is described below: > > > > > > 1. A pair of SR paths is set up between the given two nodes =E2= =80=93 > later referred to as source and destination - in the network. These path= s > are =E2=80=9CSR-disjoint=E2=80=9D in the sense that their =E2=80=9Cexplic= it routes=E2=80=9D do not have > any common elements, be they nodes or adjacencies, with exclusion of the > final destination > > > 2. Local repair for these paths is enabled in the network. It is > triggered by locally observed events (link failures etc.), applied by the > nodes adjacent to the failure and guarantees that, in the case of a link = or > node failure that is not specified in the explicit route, traffic along t= he > affected path would be restored within milliseconds > > > 3. End-to-end liveness monitoring is enabled for the two SR paths= , > and detects end-to-end failures of these paths within milliseconds > where Y >> X. In other words, end-to-end liveness monitoring for these > paths will ignore any failures that local repair can fix, but will detect > failures that cannot be locally repaired (e.g., failures of nodes or link= s > that have been specified in the explicit route of one of the paths > > > 4. End-to-end liveness monitoring triggers end-to-end path > protection to be applied by the source node in the following way: > > > a. If it recognizes both paths as alive, one of them will carry > the customer traffic, while the other one will be idle. The rules for > selecting the active path in this scenario may vary > > > b. If end-to-end failure of one of these paths is detected while > the other one remains alive, traffic will be carried across the live path > > > c. If end-to-end failure of both paths is detected (e.g., if the > final destination node fails, or if the network is partitioned), this is > recognized as an unrecoverable failure. > > > > > > From my POV the combination of local repair and end-to-end protection > for SR paths is one of a few possibilities to protect such paths against > failures of nodes and/or links that have been specified in their explicit > routes. (Another option has been described in Node Protection for SR-TE > Paths, but this draft has expired). > > > > > > Do I miss something substantial? > > > > > > to my view you created a use-case that doesn=E2=80=99t bring much to the = picture > but I=E2=80=99d let operators to comment. > > > > s. > > > > > > > > > > Regards, > > > Sasha > > > > > > Office: +972-39266302 <+972%203-926-6302> > > > Cell: +972-549266302 <+972%2054-926-6302> > > > Email: Alexander.Vainshtein@ecitele.com > > > > > > > > > ______________________________________________________________________ > > > _____ > > > > > > This e-mail message is intended for the recipient only and contains > > > information which is CONFIDENTIAL and which may be proprietary to ECI > > > Telecom. If you have received this transmission in error, please > > > inform us by e-mail, phone or fax, and then delete the original and all > copies thereof. > > > ______________________________________________________________________ > > > _____ _______________________________________________ > > > spring mailing list > > > spring@ietf.org > > > https://www.ietf.org/mailman/listinfo/spring > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > --001a113d3594971f52054fa0e05d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
= Using end-to-end path protection togeth= er with local protection can result in traffic loops. Consider the foll. to= pology:

B-----C =C2=A0=C2=A0
| =C2=A0 =C2=A0/ \
| =C2=A0 / =C2= =A0 \=C2=A0
| =C2=A0/ =C2=A0 =C2=A0 \
| / =C2=A0 =C2=A0 =C2=A0 \D----+= =C2=A0
A/ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Z (CE)
=C2=A0= \ =C2=A0 =C2=A0 =C2=A0 =C2=A0 F----+=C2=A0
=C2=A0 \ =C2=A0 =C2=A0 =C2=A0 = /
=C2=A0 =C2=A0\ =C2=A0 =C2=A0 /
=C2=A0 =C2=A0 \ =C2=A0 /=C2=A0<= /div>
=C2= =A0 =C2=A0 =C2=A0\E/

- All links are of = equal cost.
- A, D and F are BGP peers.
- Z is a dual-homed CE.
<= br>
A resolves its BGP next-hop D over the SR-TE tunnel T1.
<= div class=3D"gmail_default">T1: A->B= , B->C, C->D (loosely routed)

Suppose A has enabled en= d-to-end path protection over tunnel T1 and B has TI-LFA enabled, and the d= etection timers are configured as described in your previous email. If the = BC link goes down, B will immediately start rerouting the traffic via A (in= FRR fashion) creating a loop b/w A and B.

A solution would be to make the A-B link ineligible for TI-LFA backup co= mputation at B. However, managing this network-wide could become operationa= l expensive. Hence, deploying one of end-to-end path protection or local pr= otection with sufficiently short detection timers keeps things simple, IMHO= .

Regards,
Muthu

= On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtein <= ;Alex= ander.Vainshtein@ecitele.com> wrote:

=C2=A0

=C2=A0

=C2=A0

From: Alexander Vainshtein
Sent: Tuesday, May 16, 2017 11:28 AM
To: 'Stefano Previdi (sprevidi)' <sprevidi@cisco.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org= ; spring@ietf.org;= Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhovsky <Michael.Gorokhovsk= y@ecitele.com>; Sidd Aanand <Sidd.Aanand@ecitele.com>; Ron Sdayoor = <Ron.Sdayoo= r@ecitele.com>; Rotem Cohen <Rotem.Coh= en@ecitele.com>
Subject: RE: [spring] A belated comment on end-to-end path pr= otection in draft-ietf-spring-resiliency-use-cases

=C2=A0

Stefano,

Lots of thanks for a prompt = response.

=C2=A0

A couple of short comments i= f you do not mind:

=C2=A0

Using 2119 language in= a "use cases" document:

1.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Going back to the source I se= e that =E2=80=9CMUST NOT=E2=80=A6 mean that the definition is an absolute p= rohibition of the specification=E2=80=9D

2.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I agree that the use case doc= ument defines which scenarios should be addressed, but I do not see how it = can impose an absolute prohibition on a certain scenario.

=C2=A0

Little sense link prot= ection has in the case of path protection:

1.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This was definitely correct f= or traditional traffic engineering because the =E2=80=9Cshortest traffic pa= ths=E2=80=9D (e.g., LDL PSPs) could be easily differentiated from the =E2= =80=9Cengineered traffic paths=E2=80=9D.

2.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 In addition, traditional loca= l protection (e.g., MPLS FRR using RSVP-TE) could deal with link and node f= ailures regardless of whether the failed link or node appeared in the ERO o= f the protected path.

3.=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 IMHO and FWIW, with SR=C2=A0 = the situation is quite different:

o=C2=A0=C2=A0 The shortest traffic p= aths not only coexist with engineered traffic paths: the latter are in many= cases =E2=80=9Ctunneled=E2=80=9D within the former.

o=C2=A0=C2=A0 Path protection cannot= be applied to shortest traffic paths so they must rely on local protection=

o=C2=A0=C2=A0 Local protection in th= e case of failure of a node or link that appears in the ERO of an engineere= d SR path is highly non-trivial at best, so path protection for the enginee= red LSPs looks like a preferred solution to me.

I fully agree with you that the operators deploying SR should provide feed= back on this point based on actual operational experience.

Meanwhile I doubt that a priori declaring some use cases as absolut= ely prohibited is the right thing to do.

=C2=A0

My 2c,

Sasha

=C2=A0

Office: +972-39266302=

Cell:=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexander.Vainshtein@ecitele.com

=C2=A0

=C2=A0

-----Original Message= -----
From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]
Sent: Monday, May 15, 2017 11:12 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; S= hell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhovsky <Michael.Gorokhovsky@= ecitele.com>; Sidd Aanand <Sidd.Aana= nd@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <= Rotem.Cohen@ec= itele.com>
Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases

=C2=A0

=C2=A0

> On May 11, 2017, at 12:= 04 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> wrote:=

>

> Hi all,

> I have a belated (but h= opefully late is still better than never) comment on path protection as def= ined in Section 2 of the draft.

>=C2=A0

> This second para in thi= s section says:

>=C2=A0=C2=A0=C2=A0 A fir= st protection strategy consists in excluding any local repair=

>

>=C2=A0=C2=A0=C2=A0 but i= nstead use end-to-end path protection where each SPRING path

> is

>

>=C2=A0=C2=A0=C2=A0 prote= cted by a second disjoint SPRING path.=C2=A0 In this case local

>

>=C2=A0=C2=A0=C2=A0 prote= ction MUST NOT be used.

>

> First of all, I do not = think that RFC 2119 language should be used in Informational documents, esp= ecially in the documents that describe use cases.

=C2=A0

=C2=A0

this document is also a requ= irements document for the resiliency use-case. RFC2119 terminology is perfe= ctly usable and even more, it adds clarity on what the solution is expected= to provide.

=C2=A0

=C2=A0

> In addition, I specific= ally disagree with the quoted statement above, because, from my POV:=

> =C2=B7=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Local repair and end-to-end path protecti= on can be combined for the same path

> =C2=B7=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Such a combination may be beneficial for = the operators.

=C2=A0

=C2=A0

are you talking by experienc= e or is it just something that came into your mind ? I=E2=80=99d like to he= ar from operators using a combination of path and link protection.

=C2=A0

This document has been deepl= y reviewed also by operators and it has been always obvious the little sens= e link protection has in case of path protection.

=C2=A0

=C2=A0

> One possible way to com= bine the two is described below:

>=C2=A0

> 1.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 A pair of SR paths is set up between the given two nodes = =E2=80=93 later referred to as source and destination -=C2=A0 in the networ= k. These paths are =E2=80=9CSR-disjoint=E2=80=9D in the sense that their = =E2=80=9Cexplicit routes=E2=80=9D=C2=A0 do not have any common elements, be they nodes or adjacencies, with exclusion of the final destination

> 2.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Local repair for these paths is enabled in the network. It = is triggered by locally observed events (link failures etc.), applied by th= e nodes adjacent to the failure and guarantees that, in the case of a link = or node failure that is not specified in the explicit route, traffic along the affected pa= th would be restored within <X> milliseconds

> 3.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 End-to-end liveness monitoring is enabled for the two SR pa= ths, and detects end-to-end failures of these paths within <Y> millis= econds where Y >> X. In other words, end-to-end liveness monitoring f= or these paths will ignore any failures that local repair can fix, but will detect failures that cann= ot be locally repaired (e.g., failures of nodes or links that have been spe= cified in the explicit route of one of the paths

> 4.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 End-to-end liveness monitoring triggers end-to-end path pro= tection to be applied by the source node in the following way:

> a.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 If it recognizes both paths as alive, one of them will carr= y the customer traffic, while the other one will be idle. The rules for sel= ecting the active path in this scenario may vary

> b.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 If end-to-end failure of one of these paths is detected while the= other one remains alive, traffic will be carried across the live path

> c.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 If end-to-end failure of both paths is detected (e.g., if t= he final destination node fails, or if the network is partitioned), this is= recognized as an unrecoverable failure.

>=C2=A0

> From my POV the combina= tion of local repair and end-to-end protection for SR paths is one of a few= possibilities to protect such paths against failures of nodes and/or links= that have been specified in their explicit routes. (Another option has been described in Node Protection for SR-TE Paths, but this dra= ft has expired).

>=C2=A0

> Do I miss something sub= stantial?

=C2=A0

=C2=A0

to my view you created a use= -case that doesn=E2=80=99t bring much to the picture but I=E2=80=99d let op= erators to comment.

=C2=A0

s.

=C2=A0

=C2=A0

>=C2=A0

> Regards,<= /p>

> Sasha

>=C2=A0

> Office: +972-39266302

> Cell:=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 +972-549266302

> Email:=C2=A0=C2=A0 Alexander.Vainshtein@= ecitele.com

>=C2=A0

>

> _______________________= _______________________________________________

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> Telecom. If you have re= ceived this transmission in error, please

> inform us by e-mail, ph= one or fax, and then delete the original and all copies thereof.<= /u>

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> https://www.ietf.org/= mailman/listinfo/spring

=C2=A0


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Tue, 16 May 2017 09:44:09 +0000 From: Alexander Vainshtein To: "stephane.litkowski@orange.com" , "Stefano Previdi (sprevidi)" CC: "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen Thread-Topic: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases Thread-Index: AdLKMfwZZp8yu5h/Ra+WsEpPtv/h+gDQnJYAAClgXmAAAR1WkAAB8nrwAABPodA= Date: Tue, 16 May 2017 09:44:08 +0000 Message-ID: References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> <30960_1494926964_591AC674_30960_1681_1_9E32478DFA9976438E7A22F69B08FF921DDBA294@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: <30960_1494926964_591AC674_30960_1681_1_9E32478DFA9976438E7A22F69B08FF921DDBA294@OPEXCLILMA4.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.234.241.1] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; 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spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 06776129412; Tue, 16 May 2017 03:28:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.688 X-Spam-Level: X-Spam-Status: No, score=-2.688 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ip_xAQFqoSrl; Tue, 16 May 2017 03:28:29 -0700 (PDT) Received: from mail-oi0-x232.google.com (mail-oi0-x232.google.com [IPv6:2607:f8b0:4003:c06::232]) (using TLSv1.2 with cipher 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:message-id:subject:to:cc; bh=3wpxECqQrIGr+3yWWJJQUZUreSIoftF0elKX0pleGME=; b=fh4yoPViLkzcIoclCtY42r0YspE6hqWPVtCxX86AWCMmWkfWiysMqrIRSRTN12A24D HLurNVqpqdG8ww7XyBa7uNUlp6eMk9RGWfVxB7q2e9/nc2Xv5WklULqweFRVtJIekFPg rMi2DRxtqnQ/KNc3oe6nDFNiWaufmc8u8b83+94+t0Lfwl1XCEAkW5TTvNiDEljcQyCl 10S4TzFs+UBSr/LDEYH1qZg+uqw4Y1VFKvdfZkqtnVE4P364CycfJ8HbvVJa5yh6LhFM YXe6ieio1mzD7rGS0iH8ibJvVb0apprSi7893RV2pz3DWK5i15h9KRECzuzpDmQ6ED/o 5caw== X-Gm-Message-State: AODbwcCPtFM6m5XOereu75IvYjhNjRhxb8eeQ9bdmWY7iy5sEH7JEmyn rT5PzVSYKY9VXgOd4D0aVIpDAkuBgg== X-Received: by 10.202.79.197 with SMTP id d188mr1504895oib.137.1494930315161; Tue, 16 May 2017 03:25:15 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.25.169 with HTTP; Tue, 16 May 2017 03:25:14 -0700 (PDT) In-Reply-To: References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> From: Muthu Arul Mozhi Perumal Date: Tue, 16 May 2017 15:55:14 +0530 Message-ID: To: Alexander Vainshtein Cc: "Stefano Previdi (sprevidi)" , "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen Content-Type: multipart/alternative; boundary="001a113d73a0663552054fa196bf" Archived-At: Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 10:28:33 -0000 --001a113d73a0663552054fa196bf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein < Alexander.Vainshtein@ecitele.com> wrote: > Muthu, > > Lots of thanks for a prompt response. > > > > I do not think that the loop you have described would actually appear in > the scenario you=E2=80=99ve described. > > > > To the best of my understanding of TI-LFA, B would send the traffic back > to A *complete with an explicit route that says B**=C3=A0** A**=C3=A0** C= **=C3=A0**D*, > and no loop would be formed. > > Not necessarily. B was asked to send the traffic to C and knows that if it sends the traffic to A, then A will send it to C over the shortest path (i.e from B's perspective only the labeled next-hop changes). Unfortunately, A has an explicit route pointing back to B (over the SR-TE tunnel T1) that B isn't aware of. If B does strict explicit route for everything, then B can run out of its MSD.. > =E2=80=8B > > Similar =E2=80=9Cloops=E2=80=9D can happen also in MPLS FRR with RSVP-TE = when the PLR > sends some traffic back - but it sends it with the suitable label stack = of > the bypass tunnel so that eventually it reaches the MP. > =E2=80=8BAre there existing deployments where both e2e path protection and = local protection are used together with RSVP-TE? Regards, Muthu > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com] > *Sent:* Tuesday, May 16, 2017 12:34 PM > *To:* Alexander Vainshtein > *Cc:* Stefano Previdi (sprevidi) ; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; draft-ietf-spring-resiliency- > use-cases@ietf.org; Sidd Aanand ; Ron Sdayoor < > Ron.Sdayoor@ecitele.com>; Rotem Cohen > > *Subject:* Re: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Using end-to-end path protection together with local protection can resul= t > in traffic loops. Consider the foll. topology: > > > > B-----C > > | / \ > > | / \ > > | / \ > > | / \D----+ > > A/ Z (CE) > > \ F----+ > > \ / > > \ / > > \ / > > \E/ > > > > - All links are of equal cost. > > - A, D and F are BGP peers. > > - Z is a dual-homed CE. > > > > A resolves its BGP next-hop D over the SR-TE tunnel T1. > > T1: A->B, B->C, C->D (loosely routed) > > > > Suppose A has enabled end-to-end path protection over tunnel T1 and B has > TI-LFA enabled, and the detection timers are configured as described in > your previous email. If the BC link goes down, B will immediately start > rerouting the traffic via A (in FRR fashion) creating a loop b/w A and B. > > > > A solution would be to make the A-B link ineligible for TI-LFA backup > computation at B. However, managing this network-wide could become > operational expensive. Hence, deploying one of end-to-end path protection > or local protection with sufficiently short detection timers keeps things > simple, IMHO. > > > > Regards, > > Muthu > > > > On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Alexander Vainshtein > *Sent:* Tuesday, May 16, 2017 11:28 AM > *To:* 'Stefano Previdi (sprevidi)' > *Cc:* draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > *Subject:* RE: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Stefano, > > Lots of thanks for a prompt response. > > > > A couple of short comments if you do not mind: > > > > *Using 2119 language in a "use cases" document*: > > 1. Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 m= ean that the > definition is an absolute prohibition of the specification=E2=80=9D > > 2. I agree that the use case document defines which scenarios > should be addressed, but I do not see how it can impose an absolute > prohibition on a certain scenario. > > > > *Little sense link protection has in the case of path protection*: > > 1. This was definitely correct for traditional traffic engineering > because the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) cou= ld be easily > differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D. > > 2. In addition, traditional local protection (e.g., MPLS FRR using > RSVP-TE) could deal with link and node failures regardless of whether the > failed link or node appeared in the ERO of the protected path. > > 3. IMHO and FWIW, with SR the situation is quite different: > > o The shortest traffic paths not only coexist with engineered traffic > paths: the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the= former. > > o Path protection cannot be applied to shortest traffic paths so they > must rely on local protection > > o Local protection in the case of failure of a node or link that > appears in the ERO of an engineered SR path is highly non-trivial at best= , > so path protection for the engineered LSPs looks like a preferred solutio= n > to me. > > I fully agree with you that the operators deploying SR should provide > feedback on this point based on actual operational experience. > > Meanwhile I doubt that *a priori* declaring some use cases as absolutely > prohibited is the right thing to do. > > > > My 2c, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > > > -----Original Message----- > From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com > ] > Sent: Monday, May 15, 2017 11:12 AM > To: Alexander Vainshtein > Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > Subject: Re: [spring] A belated comment on end-to-end path protection in > draft-ietf-spring-resiliency-use-cases > > > > > > > On May 11, 2017, at 12:04 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Hi all, > > > I have a belated (but hopefully late is still better than never) commen= t > on path protection as defined in Section 2 of the draft. > > > > > > This second para in this section says: > > > A first protection strategy consists in excluding any local repair > > > > > > but instead use end-to-end path protection where each SPRING path > > > is > > > > > > protected by a second disjoint SPRING path. In this case local > > > > > > protection MUST NOT be used. > > > > > > First of all, I do not think that RFC 2119 language should be used in > Informational documents, especially in the documents that describe use > cases. > > > > > > this document is also a requirements document for the resiliency use-case= . > RFC2119 terminology is perfectly usable and even more, it adds clarity on > what the solution is expected to provide. > > > > > > > In addition, I specifically disagree with the quoted statement above, > because, from my POV: > > > =C2=B7 Local repair and end-to-end path protection can be combi= ned > for the same path > > > =C2=B7 Such a combination may be beneficial for the operators. > > > > > > are you talking by experience or is it just something that came into your > mind ? I=E2=80=99d like to hear from operators using a combination of pat= h and link > protection. > > > > This document has been deeply reviewed also by operators and it has been > always obvious the little sense link protection has in case of path > protection. > > > > > > > One possible way to combine the two is described below: > > > > > > 1. A pair of SR paths is set up between the given two nodes =E2= =80=93 > later referred to as source and destination - in the network. These path= s > are =E2=80=9CSR-disjoint=E2=80=9D in the sense that their =E2=80=9Cexplic= it routes=E2=80=9D do not have > any common elements, be they nodes or adjacencies, with exclusion of the > final destination > > > 2. Local repair for these paths is enabled in the network. It is > triggered by locally observed events (link failures etc.), applied by the > nodes adjacent to the failure and guarantees that, in the case of a link = or > node failure that is not specified in the explicit route, traffic along t= he > affected path would be restored within milliseconds > > > 3. End-to-end liveness monitoring is enabled for the two SR paths= , > and detects end-to-end failures of these paths within milliseconds > where Y >> X. In other words, end-to-end liveness monitoring for these > paths will ignore any failures that local repair can fix, but will detect > failures that cannot be locally repaired (e.g., failures of nodes or link= s > that have been specified in the explicit route of one of the paths > > > 4. End-to-end liveness monitoring triggers end-to-end path > protection to be applied by the source node in the following way: > > > a. If it recognizes both paths as alive, one of them will carry > the customer traffic, while the other one will be idle. The rules for > selecting the active path in this scenario may vary > > > b. If end-to-end failure of one of these paths is detected while > the other one remains alive, traffic will be carried across the live path > > > c. If end-to-end failure of both paths is detected (e.g., if the > final destination node fails, or if the network is partitioned), this is > recognized as an unrecoverable failure. > > > > > > From my POV the combination of local repair and end-to-end protection > for SR paths is one of a few possibilities to protect such paths against > failures of nodes and/or links that have been specified in their explicit > routes. (Another option has been described in Node Protection for SR-TE > Paths, but this draft has expired). > > > > > > Do I miss something substantial? > > > > > > to my view you created a use-case that doesn=E2=80=99t bring much to the = picture > but I=E2=80=99d let operators to comment. > > > > s. > > > > > > > > > > Regards, > > > Sasha > > > > > > Office: +972-39266302 <+972%203-926-6302> > > > Cell: +972-549266302 <+972%2054-926-6302> > > > Email: Alexander.Vainshtein@ecitele.com > > > > > > > > > ______________________________________________________________________ > > > _____ > > > > > > This e-mail message is intended for the recipient only and contains > > > information which is CONFIDENTIAL and which may be proprietary to ECI > > > Telecom. If you have received this transmission in error, please > > > inform us by e-mail, phone or fax, and then delete the original and all > copies thereof. > > > ______________________________________________________________________ > > > _____ _______________________________________________ > > > spring mailing list > > > spring@ietf.org > > > https://www.ietf.org/mailman/listinfo/spring > > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > --001a113d73a0663552054fa196bf Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitel= e.com> wrote:

Muthu,

Lots of thanks for a prompt response.=

=C2=A0

I do not think that the loop y= ou have described would actually appear in the scenario you=E2=80=99ve desc= ribed.

=C2=A0

To the best of my understanding of TI= -LFA, B would send the traffic back to A complete with an explicit route that says B=C3=A0<= span style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;c= olor:#44546a"> A=C3=A0 C=C3=A0D, and no loop would be formed. =C2=A0

<= /div>

Not necessar= ily. B was asked to send the traffic to C and knows that if it sends the tr= affic to A, then A will send it to C over the shortest path (i.e from B'= ;s perspective only the labeled next-hop changes). Unfortunately, A has an = explicit route pointing back to B (over the SR-TE tunnel T1) that B isn'= ;t aware of. If B does strict explicit route for everything, then B can run= out of its MSD..=C2=A0
=C2=A0

=E2=80=8B

Similar =E2=80=9Cloops=E2=80=9D can h= appen also in MPLS FRR with RSVP-TE when the PLR sends some traffic back=C2= =A0 - but it sends it with the suitable label stack of the bypass tunnel so that eventually it reaches the MP.

<= div>
=E2=80=8BAre there existing deploymen= ts where both e2e path protection and local protection are used together wi= th RSVP-TE?

Regards,
Muthu
=C2=A0

=C2=A0

Regards,

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <= a href=3D"tel:+972%2054-926-6302" value=3D"+972549266302" target=3D"_blank"= >+972-549266302

Email:=C2=A0=C2=A0 Alexander.Vainshtein@ec= itele.com

=C2=A0

From: Muthu Arul Mozhi Peruma= l [mailto:muthu.a= rul@gmail.com]
Sent: Tuesday, May 16, 2017 12:34 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>= ;
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele= .com>; Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>= ;; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd= Aanand <Si= dd.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>


Subject: Re: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases
<= p>

=C2=A0

= Using end-to-end path protection together with local protection can result = in traffic loops. Consider the foll. topology:

=C2=A0

= B-----C =C2=A0=C2=A0

= | =C2=A0 =C2=A0/ \

= | =C2=A0 / =C2=A0 \=C2=A0

= | =C2=A0/ =C2=A0 =C2=A0 \

= | / =C2=A0 =C2=A0 =C2=A0 \D----+=C2=A0

= A/ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Z (CE)<= /u>

= =C2=A0\ =C2=A0 =C2=A0 =C2=A0 =C2=A0 F----+=C2=A0

= =C2=A0 \ =C2=A0 =C2=A0 =C2=A0 /

= =C2=A0 =C2=A0\ =C2=A0 =C2=A0 /

= =C2=A0 =C2=A0 \ =C2=A0 /=C2=A0

= =C2=A0 =C2=A0 =C2=A0\E/

=C2=A0

= - All links are of equal cost.

= - A, D and F are BGP peers.

= - Z is a dual-homed CE.

=C2=A0

= A resolves its BGP next-hop D over the SR-TE tunnel T1.

= T1: A->B, B->C, C->D (loosely routed)

=C2=A0

= Suppose A has enabled end-to-end path protection over tunnel T1 and B has T= I-LFA enabled, and the detection timers are configured as described in your= previous email. If the BC link goes down, B will immediately start rerouting the traffic via A (in FRR fashion) creating a = loop b/w A and B.

=C2=A0

= A solution would be to make the A-B link ineligible for TI-LFA backup compu= tation at B. However, managing this network-wide could become operational e= xpensive. Hence, deploying one of end-to-end path protection or local protection with sufficiently short detection timers ke= eps things simple, IMHO.

=C2=A0

= Regards,

= Muthu

=C2=A0

On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtei= n <Alexander.Vainshtein@ecitele.com> wrote:

=C2=A0

=C2=A0

Regards,=

Sasha=

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexa= nder.Vainshtein@ecitele.com

=C2=A0

From: Alexander Vainshtein
Sent: Tuesday, May 16, 2017 11:28 AM
To: 'Stefano Previdi (sprevidi)' <sprevidi@cisco.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhov= sky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aana= nd@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <= Rotem.Cohen@ec= itele.com>
Subject: RE: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases

=C2=A0

Stefano,<= u>

Lots of t= hanks for a prompt response.

=C2=A0=

A couple = of short comments if you do not mind:

=C2=A0=

Usi= ng 2119 language in a "use cases" document:

1.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 mean = that the definition is an absolute prohibition of the specification=E2=80= =9D

2.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 I agree that the use case document defines which scenarios should be= addressed, but I do not see how it can impose an absolute prohibition on a= certain scenario.

=C2=A0=

Lit= tle sense link protection has in the case of path protection:

1.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 This was definitely correct for traditional traffic engineering beca= use the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) could be = easily differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D.

2.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 In addition, traditional local protection (e.g., MPLS FRR using RSVP= -TE) could deal with link and node failures regardless of whether the faile= d link or node appeared in the ERO of the protected path.

3.=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 IMHO and FWIW, with SR=C2=A0 the situation is quite different:

o=C2=A0=C2=A0 The shortest traffic paths not only coexist with engineered traffic = paths: the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the f= ormer.

o=C2=A0=C2=A0 Path protection cannot be applied to shortest traffic paths so they = must rely on local protection

o=C2=A0=C2=A0 Local protection in the case of failure of a node or link that appea= rs in the ERO of an engineered SR path is highly non-trivial at best, so pa= th protection for the engineered LSPs looks like a preferred solution to me= .

I fully agree with you that the operators deploying SR = should provide feedback on this point based on actual operational experienc= e.

Meanwhile I doubt that a priori declaring some use cases as absolutely prohibited is the ri= ght thing to do.

=C2=A0=

My 2c,=

Sasha<= /u>

=C2=A0=

Office: <= a href=3D"tel:+972%203-926-6302" target=3D"_blank"> +972-39266302

Cell:=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

Email:=C2= =A0=C2=A0 Alexander.Vainshtein@ecitele.com

=C2=A0=

=C2=A0=

-----Orig= inal Message-----
From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]
Sent: Monday, May 15, 2017 11:12 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhov= sky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aana= nd@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <= Rotem.Cohen@ec= itele.com>
Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases

=C2=A0=

=C2=A0=

> On M= ay 11, 2017, at 12:04 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com&g= t; wrote:

> <= /u>

> Hi a= ll,

> I ha= ve a belated (but hopefully late is still better than never) comment on pat= h protection as defined in Section 2 of the draft.

>=C2= =A0

> This= second para in this section says:

>=C2= =A0=C2=A0=C2=A0 A first protection strategy consists in excluding any local= repair

> <= /u>

>=C2= =A0=C2=A0=C2=A0 but instead use end-to-end path protection where each SPRIN= G path

> is

> <= /u>

>=C2= =A0=C2=A0=C2=A0 protected by a second disjoint SPRING path.=C2=A0 In this c= ase local

> <= /u>

>=C2= =A0=C2=A0=C2=A0 protection MUST NOT be used.

> <= /u>

> Firs= t of all, I do not think that RFC 2119 language should be used in Informati= onal documents, especially in the documents that describe use cases.=

=C2=A0=

=C2=A0=

this docu= ment is also a requirements document for the resiliency use-case. RFC2119 t= erminology is perfectly usable and even more, it adds clarity on what the s= olution is expected to provide.

=C2=A0=

=C2=A0=

> In a= ddition, I specifically disagree with the quoted statement above, because, = from my POV:

> =C2= =B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Local repair and end-to= -end path protection can be combined for the same path

> =C2= =B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Such a combination may = be beneficial for the operators.

=C2=A0=

=C2=A0=

are you t= alking by experience or is it just something that came into your mind ? I= =E2=80=99d like to hear from operators using a combination of path and link= protection.

=C2=A0=

This docu= ment has been deeply reviewed also by operators and it has been always obvi= ous the little sense link protection has in case of path protection.=

=C2=A0=

=C2=A0=

> One = possible way to combine the two is described below:

>=C2= =A0

> 1.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 A pair of SR paths is set up between t= he given two nodes =E2=80=93 later referred to as source and destination -= =C2=A0 in the network. These paths are =E2=80=9CSR-disjoint=E2=80=9D in the= sense that their =E2=80=9Cexplicit routes=E2=80=9D=C2=A0 do not have any common elements, be they nodes or adjacencies, with exclusion of = the final destination

> 2.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Local repair for these paths is enable= d in the network. It is triggered by locally observed events (link failures= etc.), applied by the nodes adjacent to the failure and guarantees that, i= n the case of a link or node failure that is not specified in the explicit route, traffi= c along the affected path would be restored within <X> milliseconds

> 3.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 End-to-end liveness monitoring is enab= led for the two SR paths, and detects end-to-end failures of these paths wi= thin <Y> milliseconds where Y >> X. In other words, end-to-end = liveness monitoring for these paths will ignore any failures that local repair can fix, but will detect = failures that cannot be locally repaired (e.g., failures of nodes or links = that have been specified in the explicit route of one of the paths

> 4.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 End-to-end liveness monitoring trigger= s end-to-end path protection to be applied by the source node in the follow= ing way:

> a.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If it recognizes both paths as alive, = one of them will carry the customer traffic, while the other one will be id= le. The rules for selecting the active path in this scenario may vary

> b.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If end-to-end failure of one of these paths = is detected while the other one remains alive, traffic will be carried acro= ss the live path

> c.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If end-to-end failure of both paths is= detected (e.g., if the final destination node fails, or if the network is = partitioned), this is recognized as an unrecoverable failure.=

>=C2= =A0

> From= my POV the combination of local repair and end-to-end protection for SR pa= ths is one of a few possibilities to protect such paths against failures of= nodes and/or links that have been specified in their explicit routes. (Another option has been described in Node Protection for SR-TE Pa= ths, but this draft has expired).

>=C2= =A0

> Do I= miss something substantial?

=C2=A0=

=C2=A0=

to my vie= w you created a use-case that doesn=E2=80=99t bring much to the picture but= I=E2=80=99d let operators to comment.

=C2=A0=

s.=

=C2=A0=

=C2=A0=

>=C2= =A0

> Rega= rds,

> Sash= a

>=C2= =A0

> Offi= ce: +972-39266302

> Cell= :=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

> Emai= l:=C2=A0=C2=A0 Alexander.Vainshtein@= ecitele.com

>=C2= =A0

> <= /u>

> ____= _________________________________________________________________= _

> ____= _

> <= /u>

> This= e-mail message is intended for the recipient only and contains

> info= rmation which is CONFIDENTIAL and which may be proprietary to ECI

> Tele= com. If you have received this transmission in error, please

> info= rm us by e-mail, phone or fax, and then delete the original and all copies = thereof.

> ____= _________________________________________________________________= _

> ____= _ _______________________________________________

> spri= ng mailing list

> spring@ietf.org

> https://www.ietf.org/= mailman/listinfo/spring

=C2=A0=


_________________________________________________________________= __________

This e-mail message is intended for the recipient only and contains informa= tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this
transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original
and all copies thereof.
_________________________________________________________________= __________


_______________________________________________
spring mailing list
spring@ietf.org = https://www.ietf.org/mailman/listinfo/spring

=C2=A0


_________________________________________________________________= __________

This e-mail message is intended for the recipient only and contains informa= tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this
transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original
and all copies thereof.
_________________________________________________________________= __________

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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 13:47:33 -0000 --------------684D0EA840B23F2DC8B9B1B4 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit On 5/12/2017 7:55 PM, Les Ginsberg (ginsberg) wrote: > > We are assuming a default behavior of PHP for SR-MPLS. If folks > believe this requires explicit specification I would propose language > similar to the following: > > /"When Segment Routing is instantiated over the MPLS data plane the > penultimate node performs the NEXT operation (i.e., MPLS pop) unless a > specific indication to do otherwise is advertised by the ultimate node."/ > > I think this certainly needs to be stated explicitly, perhaps in the document that specfies the use of the MPLS dataplane for SR. It should also be noted that there are circumstances under which the default will not produce the required behavior, so it may not always be safe to use the default behavior. (For example, if a SID represents a multicast tree, and the payload is an MPLS packet that begins with an upstream-assigned label, PHP just won't produce the proper result because the label that was popped provides the context for interpreting the upstream-assigned label that has now risen to the top of the stack.) > As to why we are choosing PHP rather than UHP as the default, it is > our belief that most of the platforms which support MPLS today have > been implemented to take advantage of the optimizations that PHP > affords. In some cases it may even be true that UHP is not supported > at all. > I believe you are correct about this. --------------684D0EA840B23F2DC8B9B1B4 Content-Type: text/html; charset="windows-1252" Content-Transfer-Encoding: 8bit On 5/12/2017 7:55 PM, Les Ginsberg (ginsberg) wrote:

We are assuming a default behavior of PHP for SR-MPLS. If folks believe this requires explicit specification I would propose language similar to the following:

"When Segment Routing is instantiated over the MPLS data plane the penultimate node performs the NEXT operation (i.e., MPLS pop) unless a specific indication to do otherwise is advertised by the ultimate node."


I think this certainly needs to be stated explicitly, perhaps in the document that specfies the use of the MPLS dataplane for SR.

It should also be noted that there are circumstances under which the default will not produce the required behavior, so it may not always be safe to use the default behavior. (For example, if a SID represents a multicast tree, and the payload is an MPLS packet that begins with an upstream-assigned label, PHP just won't produce the proper result because the label that was popped provides the context for interpreting the upstream-assigned label that has now risen to the top of the stack.)

As to why we are choosing PHP rather than UHP as the default, it is our belief that most of the platforms which support MPLS today have been implemented to take advantage of the optimizations that PHP affords. In some cases it may even be true that UHP is not supported at all.


I believe you are correct about this.
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16 May 2017 14:04:58.9952 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2c514a61-08de-4519-b4c0-921fef62c42a X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR03MB1714 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 14:10:18 -0000 --_000_AM4PR03MB17136F137C88C45FFC1F76D99DE60AM4PR03MB1713eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, I concur with Eric, and I would like to mention yet another (albeit simila= r) use case where PHP MUST NOT be used with SR LSPs. RFC 8104 describes the PW egress endp= oint protection mechanism that uses bypass tunnels between the PLR and the= "Protector" node. The top label of the bypass tunnel is used by the Protector node as the "c= ontext label" for the next (PW) label in the label stack, and hence PHP MU= ST NOT ever be used with these tunnels. RFC 8104 claims that it is applicable to any technology that sets up tunne= l LSPs (it explicitly states that it is applicable to LDP LSPs), so I assu= me that it should be able to operate with SR LSPs as well. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Eric C Rosen Sent: Tuesday, May 16, 2017 4:44 PM To: Les Ginsberg (ginsberg) ; Shraddha Hegde ; draft-ietf-spring-conflict-resolution@ietf.org Cc: spring@ietf.org Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution= On 5/12/2017 7:55 PM, Les Ginsberg (ginsberg) wrote: We are assuming a default behavior of PHP for SR-MPLS. If folks believe th= is requires explicit specification I would propose language similar to the= following: "When Segment Routing is instantiated over the MPLS data plane the penulti= mate node performs the NEXT operation (i.e., MPLS pop) unless a specific i= ndication to do otherwise is advertised by the ultimate node." I think this certainly needs to be stated explicitly, perhaps in the docum= ent that specfies the use of the MPLS dataplane for SR. It should also be noted that there are circumstances under which the defau= lt will not produce the required behavior, so it may not always be safe to= use the default behavior. (For example, if a SID represents a multicast = tree, and the payload is an MPLS packet that begins with an upstream-assig= ned label, PHP just won't produce the proper=20result because the label th= at was popped provides the context for interpreting the upstream-assigned = label that has now risen to the top of the stack.) As to why we are choosing PHP rather than UHP as the default, it is our be= lief that most of the platforms which support MPLS today have been impleme= nted to take advantage of the optimizations that PHP affords. In some case= s it may even be true that UHP is not supported at all. I believe you are correct about this. __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this=20 transmission in error, please inform us by e-mail, phone or fax, and then = delete the original=20 and all copies thereof. __________________________________________________________________________= _ --_000_AM4PR03MB17136F137C88C45FFC1F76D99DE60AM4PR03MB1713eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =

Hi all,

I concur with Eric, and I would lik= e to mention yet another (albeit similar) use case where PHP MUST NOT be u= sed with SR LSPs.

 

RFC 8104 describes the PW egress endpoint protection mech= anism that uses bypass tunnels between the PLR and the “Protector” node.

The top label of the bypass tunnel = is used by the Protector node as the “context label” for the n= ext (PW) label in the label stack, and hence PHP MUST NOT ever be used with these tunnels.

 

RFC 8104 claims that it is applicab= le to any technology that sets up tunnel LSPs (it explicitly states that i= t is applicable to LDP LSPs), so I assume that  it should be able to operate with SR LSPs as well.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:     = +972-549266302

Email:   Alexander.Vainsh= tein@ecitele.com

 

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Eric C Rosen
Sent: Tuesday, May 16, 2017 4:44 PM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; Shraddha He= gde <shraddha@juniper.net>; draft-ietf-spring-conflict-resolution@ie= tf.org
Cc: spring@ietf.org
Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-res= olution

 

On 5/12/2017 7:55 PM, Les Ginsberg (ginsberg) wrote= :

We are assuming a default behavior of PHP for SR= -MPLS. If folks believe this requires explicit specification I would propose language similar to the following:

 

"When Segment Routing is instantiated over the MPL= S data plane the penultimate node performs the NEXT operation (i.e., MPLS = pop) unless a specific indication to do otherwise is advertised by the ultimate node."



I think this certainly needs to be stated explicitl= y, perhaps in the document that specfies the use of the MPLS dataplane for= SR.

It should also be noted that there are circumstances under which the defau= lt will not produce the required behavior, so it may not always be safe to= use the default behavior.  (For example, if a SID represents a multi= cast tree, and the payload is an MPLS packet that begins with an upstream-assigned label, PHP just won't produce the p= roper result because the label that was popped provides the context for in= terpreting the upstream-assigned label that has now risen to the top of th= e stack.)


As to why we are choosing PHP rather than UHP as= the default, it is our belief that most of the platforms which support MPLS today have been implemented to take advantage of the o= ptimizations that PHP affords. In some cases it may even be true that UHP = is not supported at all.


I believe you are correct about this.


__________________________________________________________________________= _

This e-mail message is intended for the recipient only and contains inform= ation which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this
transmission in error, please inform us by e-mail, phone or fax, and then = delete the original
and all copies thereof.
__________________________________________________________________________= _
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Tue, 16 May 2017 14:24:10 +0000 From: Alexander Vainshtein To: "Stefano Previdi (sprevidi)" CC: "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen , Stephane Litkowski Thread-Topic: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases Thread-Index: AdLKMfwZZp8yu5h/Ra+WsEpPtv/h+gDQnJYAAClgXmAAAR1WkAAB8nrwABH2A4AAB/Ar0A== Date: Tue, 16 May 2017 14:24:10 +0000 Message-ID: References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> <30960_1494926964_591AC674_30960_1681_1_9E32478DFA9976438E7A22F69B08FF921DDBA294@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.234.241.1] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; DB6PR0301MB2567; 7:NwwjwybPUKDppr0wMAKhGY3QC0PZOlconWh3LovyG7pQCQ0COf9tYCtElxmtf663Atz22m4rFjpuwV0SpJfeqEVNmiHWh/rAgdPbMt3PK024M5Pf7MhUzBNAYYqqrSAUZx78/j+Ve3Jarw+AkFZsoA1k2xOR1nDU/pFKlGvbasONJMZb7ZkabHAi+cL+cxoziW0+xqkE7e0SphF99WRIjXkHJ/vAXR++cDB+Zy2t3w+VbTI6KSNYyvxP1BWrZB8KcONcC0kUERlOOstrGfF4P+Y/8rVmWjhuDCwwckHw+Fg8Z6HJmTlX6D5A7KhmRMoWbPG0huyAYtTzExkN01+y4g== x-ms-office365-filtering-correlation-id: f6d571c1-6f0d-43d4-5a0f-08d49c67381f x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:; 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X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCgpUaGlzIGUtbWFpbCBtZXNzYWdlIGlzIGlu dGVuZGVkIGZvciB0aGUgcmVjaXBpZW50IG9ubHkgYW5kIGNvbnRhaW5zIGluZm9ybWF0aW9uIHdo aWNoIGlzIApDT05GSURFTlRJQUwgYW5kIHdoaWNoIG1heSBiZSBwcm9wcmlldGFyeSB0byBFQ0kg VGVsZWNvbS4gSWYgeW91IGhhdmUgcmVjZWl2ZWQgdGhpcyAKdHJhbnNtaXNzaW9uIGluIGVycm9y LCBwbGVhc2UgaW5mb3JtIHVzIGJ5IGUtbWFpbCwgcGhvbmUgb3IgZmF4LCBhbmQgdGhlbiBkZWxl dGUgdGhlIG9yaWdpbmFsIAphbmQgYWxsIGNvcGllcyB0aGVyZW9mLgpfX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18K From nobody Tue May 16 07:37:31 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B5B2F126E01; Tue, 16 May 2017 07:37:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.399 X-Spam-Level: X-Spam-Status: No, score=-5.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-2.8, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rjuQW3giCGea; Tue, 16 May 2017 07:37:28 -0700 (PDT) Received: from relais-inet.orange.com (mta135.mail.business.static.orange.com [80.12.70.35]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CEC4A12EBAD; Tue, 16 May 2017 07:32:29 -0700 (PDT) Received: from opfednr06.francetelecom.fr (unknown [xx.xx.xx.70]) by opfednr23.francetelecom.fr (ESMTP service) with ESMTP id 7EE16C03A0; Tue, 16 May 2017 16:32:28 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.32]) by opfednr06.francetelecom.fr (ESMTP service) with ESMTP id 1D8CA1A0062; Tue, 16 May 2017 16:32:28 +0200 (CEST) Received: from OPEXCLILM21.corporate.adroot.infra.ftgroup ([fe80::e92a:c932:907e:8f06]) by OPEXCLILM32.corporate.adroot.infra.ftgroup ([fe80::8924:188:2124:a046%19]) with mapi id 14.03.0339.000; Tue, 16 May 2017 16:32:27 +0200 From: To: Eric C Rosen , Shraddha Hegde , "draft-ietf-spring-mpls-anycast-segments@ietf.org" , "draft-ietf-isis-segment-routing-extensions@ietf.org" CC: "spring@ietf.org" , Alexander Vainshtein , "Les Ginsberg (ginsberg)" , "draft-ietf-spring-conflict-resolution@ietf.org" Thread-Topic: [spring] Mail regarding draft-ietf-spring-conflict-resolution Thread-Index: AQHSyyeaKJhnkudGZUWPVICVzdeXfaH3CT1Q Date: Tue, 16 May 2017 14:32:27 +0000 Message-ID: <24205_1494945148_591B0D7C_24205_5702_2_53C29892C857584299CBF5D05346208A31D17BFE@OPEXCLILM21.corporate.adroot.infra.ftgroup> References: <97e3921eb1014725a484156d96191570@XCH-ALN-001.cisco.com> <7e54eb8d-7b13-0022-694b-c2f3be7e1654@juniper.net> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.3] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resolution X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 14:37:30 -0000 > -----Original Message----- > From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Eric C Rosen > Sent: Friday, May 12, 2017 3:51 PM > To: Alexander Vainshtein; Les Ginsberg (ginsberg); Shraddha Hegde; draft= -ietf-spring- > conflict-resolution@ietf.org > Cc: spring@ietf.org > Subject: Re: [spring] Mail regarding draft-ietf-spring-conflict-resoluti= on >=20 > On 5/11/2017 7:30 AM, Alexander Vainshtein wrote: >=20 > Specifically, from my POV, if a SR-capable node with SGB base and No= de SID > receives a labeled packet with top label , this label MUST be termi= nated regardless of > whether the node did or did not advertise PHP. >=20 > This seems like it might be too strong a requirement.=A0 If the node is = expecting PHP, I don't > think it is reasonable to expect it to set up its data plane forwarding = structures to handle > both the PHP and the non-PHP case. >=20 > We might also question the statement that Les made: "[if] there is no ad= vertisement of P/E > for any of the destinations. It must follow a default behavior [when dec= iding whether to use > PHP]". >=20 > Proper operation of the system seems to require that everyone knows when= to do PHP and > when not to do it.=A0 If all the progamming of the data plane is done by= a controller, it has to > program the nodes consistently.=A0 If the programming of the data plane = is done by a control > plane, and control plane errors or config errors cause inconsistent prog= ramming of the data > plane, it would be nice if there were some way of detecting this and per= haps taking some > deterministic remedial action.=A0 While the scenario under discussion is= not, strictly speaking, > a "SID conflict", it does have a strong resemblance to the SID conflict = case, in that the > control plane is advertising an inconsistency that is likely to break th= ings. Eric, thank you for your useful feedback. I see 3 cases: 1) When a node advertise its own SID, It looks to me that the architecture document is clear about the behavior: "A Node N advertising a Prefix-SID SID-R for its attached prefix R unsets the P-Flag (or NP-Flag) in order to instruct its connected neighbors to perform the NEXT operation while processing SID-R. This behavior is equivalent to Penultimate Hop Popping in MPLS. When the flag is unset, the neighbors of N MUST perform the NEXT operation while processing SID-R. When the flag is set, the neighbors of N MUST perform the CONTINUE operation while processing SID-R." https://tools.ietf.org/html/draft-ietf-spring-segment-routing-11#section-3.= 1.2 2) For the case where the SID is advertised by a Mapping Server,=20 it looks to me that the normative behavior is defined in https://tools.ietf= .org/html/draft-ietf-isis-segment-routing-extensions-12#section-2.4.5.2 Eric, it would be useful if you could review this text and provides comment= s. On my side, I feel that the text could be reworked to normatively specify w= hen PHP MUST be done (aka SR NEXT) and when UHP (aka SR CONTINUE) MUST be d= one (and explicit null MUST NOT be used) 3) For the anycast case raised by Shraddha, One option may be to handle this case in draft-ietf-spring-mpls-anycast-seg= ments. https://tools.ietf.org/html/draft-ietf-spring-mpls-anycast-segments-= 01 Especially since it states "Like unicast prefix segments, anycast prefix se= gments SHOULD be advertised in IGP Link-state advertsements using IGP proto= col extension for SR specified in [I-D.ietf-isis-segment-routing-extension= s], [I-D.ietf-ospf-segment-routing-extensions]"=20 which seems to exactly brings Shraddha's question. (i.e. what is the behavi= or if they are not) Thanks, --Bruno ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. From nobody Tue May 16 08:16:18 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0D32B1292FC; Tue, 16 May 2017 08:16:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.688 X-Spam-Level: X-Spam-Status: No, score=-2.688 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IA9PQKNy843R; Tue, 16 May 2017 08:16:11 -0700 (PDT) Received: from mail-oi0-x230.google.com (mail-oi0-x230.google.com [IPv6:2607:f8b0:4003:c06::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A247312EB9E; Tue, 16 May 2017 08:12:47 -0700 (PDT) Received: by mail-oi0-x230.google.com with SMTP id w10so29228341oif.0; Tue, 16 May 2017 08:12:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=BojzgrajzU0y1v2RoJf+p8tO+kFOkTWnNA4OcQdZvtQ=; b=vVXrz7+NKNb2z7OpiyIehSiPm+jvsB3OoLl4Nyu7TZ9YQanwT3EF6ZPHIk+vNxdNu3 ZdI8cvf5Je4WmMH3hVZcpHPQ1cgfwFIj0bb+S5seDCOzmFwCo0wEeAmnNicrTqR7kKd8 6jaZBZd5dwYFCQNsEIWuGVYWNd0mIdYidsocXNtjtI+JxPzz3tqnK4orbpIs1oPlzaaV r4JmeNTQuJWZ5Mz/NOsJCLWO7sGIhRuyPokkXYd4sf4xaJAtBjr/809HwsRYZQbMgJDw NwzyJJ4D+vOZlRReG4Klw5D3NyLDxuKs8enbqmv+5UQO90ycpoS5MuMTzasdtNqOBcfd T0gA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=BojzgrajzU0y1v2RoJf+p8tO+kFOkTWnNA4OcQdZvtQ=; b=RiPNCM7Rn4qhbKYw2q5mmv2Hti5L8X+fU8PhM19lTTspDoyZn3Vsg0c4Q7n//RGRP/ tebvzhJqtxBk25mqnmnfzJCwYxKr5wsMMYh4JaV3aG0YbgLeNXZWJis9MHfT++Pl+5d4 kOG5v2jEW2sksOmAJNYJQcQImGQLfQLxKJdCiJnToj02YRnqHZDAHXcnSEgEjtgE9W0S Y3XxDs2an6CSPBwMNUIBvMIZMvZevvay1F/CNzuWJ+9ACl8PJymcXdGMSUbq2s12cF4u IdD2LiD/euqhebb5EY3Or59+T2hAG1c558TcGQ6w2BGYatXuayCbStofQiWxwpyrqBIV 2EPQ== X-Gm-Message-State: AODbwcBxdYzFF14MsoKySri/8YP+yXz4EaAEnTLHzDR4qj+wpUir35YV U8wms8JPnBR9KCUEovrK6f6ZFZGy6w== X-Received: by 10.157.54.249 with SMTP id s54mr6323787otd.61.1494947566798; Tue, 16 May 2017 08:12:46 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.25.169 with HTTP; Tue, 16 May 2017 08:12:46 -0700 (PDT) In-Reply-To: References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> From: Muthu Arul Mozhi Perumal Date: Tue, 16 May 2017 20:42:46 +0530 Message-ID: To: Alexander Vainshtein Cc: "Stefano Previdi (sprevidi)" , "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen Content-Type: multipart/alternative; boundary="001a113d0366ad4f10054fa59aea" Archived-At: Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 15:16:16 -0000 --001a113d0366ad4f10054fa59aea Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sasha, On Tue, May 16, 2017 at 4:11 PM, Alexander Vainshtein < Alexander.Vainshtein@ecitele.com> wrote: > Muthu, > > Again lots of thanks for a prompt response. I still do not think a loop > would really form because: > > =C2=B7 A sends packet to its local next hop for B with the stack = (B, > C, D) > > =C2=B7 B receives this packet with the stack (C, D), but the link= C > has failed. So B sends to its next hop for it back to A *with stack (C,D)= * > > =C2=B7 A now sends the packet to its next hop for C with the same > stack. > =E2=80=8BRight, it doesn't cause an infinite loop, but does result in packe= ts being forwarded from A -> B -> A, over a sub-optimal path, possibly overloading the A-B link and increasing the load at A, when there are better alternate paths in the network (including the shortest path from A to D). Moreover, having enabled e2e path protection at A, the operator might actually want the traffic to be switched over an alternate disjoint TE path when the primary TE path is broken -- enabling local protection might act against that goal, with traffic forwarded over sub-optimal paths. Regards, Muthu =E2=80=8B > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com] > *Sent:* Tuesday, May 16, 2017 1:25 PM > > *To:* Alexander Vainshtein > *Cc:* Stefano Previdi (sprevidi) ; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; draft-ietf-spring-resiliency- > use-cases@ietf.org; Sidd Aanand ; Ron Sdayoor < > Ron.Sdayoor@ecitele.com>; Rotem Cohen > *Subject:* Re: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > Muthu, > > Lots of thanks for a prompt response. > > > > I do not think that the loop you have described would actually appear in > the scenario you=E2=80=99ve described. > > > > To the best of my understanding of TI-LFA, B would send the traffic back > to A *complete with an explicit route that says B**=C3=A0** A**=C3=A0** C= **=C3=A0**D*, > and no loop would be formed. > > > > Not necessarily. B was asked to send the traffic to C and knows that if i= t > sends the traffic to A, then A will send it to C over the shortest path > (i.e from B's perspective only the labeled next-hop changes). > Unfortunately, A has an explicit route pointing back to B (over the SR-TE > tunnel T1) that B isn't aware of. If B does strict explicit route for > everything, then B can run out of its MSD.. > > > > =E2=80=8B > > > > Similar =E2=80=9Cloops=E2=80=9D can happen also in MPLS FRR with RSVP-TE = when the PLR > sends some traffic back - but it sends it with the suitable label stack = of > the bypass tunnel so that eventually it reaches the MP. > > > > =E2=80=8BAre there existing deployments where both e2e path protection an= d local > protection are used together with RSVP-TE? > > > > Regards, > > Muthu > > > > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com] > *Sent:* Tuesday, May 16, 2017 12:34 PM > *To:* Alexander Vainshtein > *Cc:* Stefano Previdi (sprevidi) ; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; draft-ietf-spring-resiliency- > use-cases@ietf.org; Sidd Aanand ; Ron Sdayoor < > Ron.Sdayoor@ecitele.com>; Rotem Cohen > > > *Subject:* Re: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Using end-to-end path protection together with local protection can resul= t > in traffic loops. Consider the foll. topology: > > > > B-----C > > | / \ > > | / \ > > | / \ > > | / \D----+ > > A/ Z (CE) > > \ F----+ > > \ / > > \ / > > \ / > > \E/ > > > > - All links are of equal cost. > > - A, D and F are BGP peers. > > - Z is a dual-homed CE. > > > > A resolves its BGP next-hop D over the SR-TE tunnel T1. > > T1: A->B, B->C, C->D (loosely routed) > > > > Suppose A has enabled end-to-end path protection over tunnel T1 and B has > TI-LFA enabled, and the detection timers are configured as described in > your previous email. If the BC link goes down, B will immediately start > rerouting the traffic via A (in FRR fashion) creating a loop b/w A and B. > > > > A solution would be to make the A-B link ineligible for TI-LFA backup > computation at B. However, managing this network-wide could become > operational expensive. Hence, deploying one of end-to-end path protection > or local protection with sufficiently short detection timers keeps things > simple, IMHO. > > > > Regards, > > Muthu > > > > On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Alexander Vainshtein > *Sent:* Tuesday, May 16, 2017 11:28 AM > *To:* 'Stefano Previdi (sprevidi)' > *Cc:* draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > *Subject:* RE: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Stefano, > > Lots of thanks for a prompt response. > > > > A couple of short comments if you do not mind: > > > > *Using 2119 language in a "use cases" document*: > > 1. Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 m= ean that the > definition is an absolute prohibition of the specification=E2=80=9D > > 2. I agree that the use case document defines which scenarios > should be addressed, but I do not see how it can impose an absolute > prohibition on a certain scenario. > > > > *Little sense link protection has in the case of path protection*: > > 1. This was definitely correct for traditional traffic engineering > because the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) cou= ld be easily > differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D. > > 2. In addition, traditional local protection (e.g., MPLS FRR using > RSVP-TE) could deal with link and node failures regardless of whether the > failed link or node appeared in the ERO of the protected path. > > 3. IMHO and FWIW, with SR the situation is quite different: > > o The shortest traffic paths not only coexist with engineered traffic > paths: the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the= former. > > o Path protection cannot be applied to shortest traffic paths so they > must rely on local protection > > o Local protection in the case of failure of a node or link that > appears in the ERO of an engineered SR path is highly non-trivial at best= , > so path protection for the engineered LSPs looks like a preferred solutio= n > to me. > > I fully agree with you that the operators deploying SR should provide > feedback on this point based on actual operational experience. > > Meanwhile I doubt that *a priori* declaring some use cases as absolutely > prohibited is the right thing to do. > > > > My 2c, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > > > -----Original Message----- > From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com > ] > Sent: Monday, May 15, 2017 11:12 AM > To: Alexander Vainshtein > Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > Subject: Re: [spring] A belated comment on end-to-end path protection in > draft-ietf-spring-resiliency-use-cases > > > > > > > On May 11, 2017, at 12:04 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Hi all, > > > I have a belated (but hopefully late is still better than never) commen= t > on path protection as defined in Section 2 of the draft. > > > > > > This second para in this section says: > > > A first protection strategy consists in excluding any local repair > > > > > > but instead use end-to-end path protection where each SPRING path > > > is > > > > > > protected by a second disjoint SPRING path. In this case local > > > > > > protection MUST NOT be used. > > > > > > First of all, I do not think that RFC 2119 language should be used in > Informational documents, especially in the documents that describe use > cases. > > > > > > this document is also a requirements document for the resiliency use-case= . > RFC2119 terminology is perfectly usable and even more, it adds clarity on > what the solution is expected to provide. > > > > > > > In addition, I specifically disagree with the quoted statement above, > because, from my POV: > > > =C2=B7 Local repair and end-to-end path protection can be combi= ned > for the same path > > > =C2=B7 Such a combination may be beneficial for the operators. > > > > > > are you talking by experience or is it just something that came into your > mind ? I=E2=80=99d like to hear from operators using a combination of pat= h and link > protection. > > > > This document has been deeply reviewed also by operators and it has been > always obvious the little sense link protection has in case of path > protection. > > > > > > > One possible way to combine the two is described below: > > > > > > 1. A pair of SR paths is set up between the given two nodes =E2= =80=93 > later referred to as source and destination - in the network. These path= s > are =E2=80=9CSR-disjoint=E2=80=9D in the sense that their =E2=80=9Cexplic= it routes=E2=80=9D do not have > any common elements, be they nodes or adjacencies, with exclusion of the > final destination > > > 2. Local repair for these paths is enabled in the network. It is > triggered by locally observed events (link failures etc.), applied by the > nodes adjacent to the failure and guarantees that, in the case of a link = or > node failure that is not specified in the explicit route, traffic along t= he > affected path would be restored within milliseconds > > > 3. End-to-end liveness monitoring is enabled for the two SR paths= , > and detects end-to-end failures of these paths within milliseconds > where Y >> X. In other words, end-to-end liveness monitoring for these > paths will ignore any failures that local repair can fix, but will detect > failures that cannot be locally repaired (e.g., failures of nodes or link= s > that have been specified in the explicit route of one of the paths > > > 4. End-to-end liveness monitoring triggers end-to-end path > protection to be applied by the source node in the following way: > > > a. If it recognizes both paths as alive, one of them will carry > the customer traffic, while the other one will be idle. The rules for > selecting the active path in this scenario may vary > > > b. If end-to-end failure of one of these paths is detected while > the other one remains alive, traffic will be carried across the live path > > > c. If end-to-end failure of both paths is detected (e.g., if the > final destination node fails, or if the network is partitioned), this is > recognized as an unrecoverable failure. > > > > > > From my POV the combination of local repair and end-to-end protection > for SR paths is one of a few possibilities to protect such paths against > failures of nodes and/or links that have been specified in their explicit > routes. (Another option has been described in Node Protection for SR-TE > Paths, but this draft has expired). > > > > > > Do I miss something substantial? > > > > > > to my view you created a use-case that doesn=E2=80=99t bring much to the = picture > but I=E2=80=99d let operators to comment. > > > > s. > > > > > > > > > > Regards, > > > Sasha > > > > > > Office: +972-39266302 <+972%203-926-6302> > > > Cell: +972-549266302 <+972%2054-926-6302> > > > Email: Alexander.Vainshtein@ecitele.com > > > > > > > > > ______________________________________________________________________ > > > _____ > > > > > > This e-mail message is intended for the recipient only and contains > > > information which is CONFIDENTIAL and which may be proprietary to ECI > > > Telecom. If you have received this transmission in error, please > > > inform us by e-mail, phone or fax, and then delete the original and all > copies thereof. > > > ______________________________________________________________________ > > > _____ _______________________________________________ > > > spring mailing list > > > spring@ietf.org > > > https://www.ietf.org/mailman/listinfo/spring > > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > --001a113d0366ad4f10054fa59aea Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Sasha,
=
On Tue, May 16, 2017 at 4:11 PM, Alexander V= ainshtein <Alexander.Vainshtein@ecitele.com> = wrote:

Muthu,

Again lots of thanks for a prompt res= ponse. I still do not think a loop would really form because:=

=C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 A sends= packet to its local next hop for B with the stack (B, C, D)<= /span>

=C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 B recei= ves this packet with the stack (C, D), but the link C has failed. So B send= s to its next hop for it back to A with stack (C,D)

=C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 A now s= ends the packet to its next hop for C with the same stack.

=
=E2=80=8BRight, i= t doesn't cause an infinite loop, but does result in packets being forw= arded from A -> B -> A, over a sub-optimal path, possibly overloading= the A-B link and increasing the load at A, when there are better alternate= paths in the network (including the shortest path from A to D). Moreover, = having enabled e2e path protection at A, the operator might actually want t= he traffic to be switched over an alternate disjoint TE path when the prima= ry TE path is broken -- enabling local protection might act against that go= al, with traffic forwarded over sub-optimal paths.

Regards,
Muthu =C2= =A0=E2=80=8B
=C2=A0

=C2=A0

Regards,

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <= a href=3D"tel:+972%2054-926-6302" value=3D"+972549266302" target=3D"_blank"= >+972-549266302

Email:=C2=A0=C2=A0 Alexander.Vainshtein@ec= itele.com

=C2=A0

From: Muthu Arul Mozhi Peruma= l [mailto:muthu.a= rul@gmail.com]
Sent: Tuesday, May 16, 2017 1:25 PM


To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>= ;
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele= .com>; Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>= ;; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd= Aanand <Si= dd.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject: Re: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases
<= p>

=C2=A0

On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein <Alexander.Vainsht= ein@ecitele.com> wrote:

Muthu,

Lots of thanks for a prompt response.=

=C2=A0

I do not think that the loop you have= described would actually appear in the scenario you=E2=80=99ve described.<= /span>

=C2=A0

To the best of my understanding of TI= -LFA, B would send the traffic back to A complete with an explicit route that says B=C3=A0<= span style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;c= olor:#44546a"> A=C3=A0 C=C3=A0D, and no loop would be formed. =C2=A0

=C2=A0

Not necessarily. B was asked to send the traffic to C and knows that i= f it sends the traffic to A, then A will send it to C over the shortest pat= h (i.e from B's perspective only the labeled next-hop changes). Unfortunately, A has an explicit route pointing back to B (over = the SR-TE tunnel T1) that B isn't aware of. If B does strict explicit r= oute for everything, then B can run out of its MSD..=C2=A0

=C2=A0

=E2=80=8B

=C2=A0

Similar =E2=80=9Cloops=E2=80=9D can h= appen also in MPLS FRR with RSVP-TE when the PLR sends some traffic back=C2= =A0 - but it sends it with the suitable label stack of the bypass tunnel so that eve= ntually it reaches the MP.

=C2=A0

=E2=80=8BAre there existing deployments where both e2e path protection= and local protection are used together with RSVP-TE?<= /p>

=C2=A0

Regards,

Muthu

=C2=A0

=C2=A0

Regards,

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexa= nder.Vainshtein@ecitele.com

=C2=A0

From: Muthu Arul Mozhi Perumal [mail= to:muthu.arul@gma= il.com]
Sent: Tuesday, May 16, 2017 12:34 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>= ;
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; spring@ietf.org; S= hell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhovsky <Michael.Gorokhovsky@= ecitele.com>; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd Aanand <<= a href=3D"mailto:Sidd.Aanand@ecitele.com" target=3D"_blank">Sidd.Aanand@eci= tele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rot= em.Cohen@ecitele.com>


Subject: Re: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases

=C2=A0

= Using end-to-end path protection together with local protection can result = in traffic loops. Consider the foll. topology:

=C2=A0

= B-----C =C2=A0=C2=A0

= | =C2=A0 =C2=A0/ \

= | =C2=A0 / =C2=A0 \=C2=A0

= | =C2=A0/ =C2=A0 =C2=A0 \

= | / =C2=A0 =C2=A0 =C2=A0 \D----+=C2=A0

= A/ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Z (CE)<= /u>

= =C2=A0\ =C2=A0 =C2=A0 =C2=A0 =C2=A0 F----+=C2=A0

= =C2=A0 \ =C2=A0 =C2=A0 =C2=A0 /

= =C2=A0 =C2=A0\ =C2=A0 =C2=A0 /

= =C2=A0 =C2=A0 \ =C2=A0 /=C2=A0

= =C2=A0 =C2=A0 =C2=A0\E/

=C2=A0

= - All links are of equal cost.

= - A, D and F are BGP peers.

= - Z is a dual-homed CE.

=C2=A0

= A resolves its BGP next-hop D over the SR-TE tunnel T1.

= T1: A->B, B->C, C->D (loosely routed)

=C2=A0

= Suppose A has enabled end-to-end path protection over tunnel T1 and B has T= I-LFA enabled, and the detection timers are configured as described in your previous email. If the BC link goes down, B will immediately start= rerouting the traffic via A (in FRR fashion) creating a loop b/w A and B.<= /span>

=C2=A0

= A solution would be to make the A-B link ineligible for TI-LFA backup compu= tation at B. However, managing this network-wide could become operational expensive. Hence, deploying one of end-to-end path protection = or local protection with sufficiently short detection timers keeps things s= imple, IMHO.

=C2=A0

= Regards,

= Muthu

=C2=A0

On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtei= n <Alexander.Vainshtein@ecitele.com> wrote:

=C2=A0

=C2=A0

Regards,=

Sasha=

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexa= nder.Vainshtein@ecitele.com

=C2=A0

From: Alexander Vainshtein
Sent: Tuesday, May 16, 2017 11:28 AM
To: 'Stefano Previdi (sprevidi)' <sprevidi@cisco.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhov= sky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aana= nd@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <= Rotem.Cohen@ec= itele.com>
Subject: RE: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases

=C2=A0

Stefano,

Lots of thanks for a prompt response.

=C2=A0

A couple of short comments if you do not mind:

=C2=A0

Using 2119 language in a "use cases" document:

1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 mean that= the definition is an absolute prohibition of the specification=E2=80=9D=

2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I agree that the use case document defines which scenarios should be add= ressed, but I do not see how it can impose an absolute prohibition on a cer= tain scenario.

=C2=A0

Little sense link protection has in the case of path prote= ction:

1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This was definitely correct for traditional traffic engineering because = the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) could be easi= ly differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D.

2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 In addition, traditional local protection (e.g., MPLS FRR using RSVP-TE)= could deal with link and node failures regardless of whether the failed li= nk or node appeared in the ERO of the protected path.

3.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 IMHO and FWIW, with SR=C2=A0 the situation is quite different:=

o=C2=A0=C2=A0 The shortest traffic paths not only coexist with engineered traffic paths: = the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the former.<= u>

o=C2=A0=C2=A0 Path protection cannot be applied to shortest traffic paths so they must re= ly on local protection

o=C2=A0=C2=A0 Local protection in the case of failure of a node or link that appears in t= he ERO of an engineered SR path is highly non-trivial at best, so path prot= ection for the engineered LSPs looks like a preferred solution to me.

I fully agree with you that the operators deploying SR should provide feedb= ack on this point based on actual operational experience.

Meanwhile I doubt that a priori declaring some use cases as absolute= ly prohibited is the right thing to do.

=C2=A0

My 2c,

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexander.Vainshtein@ecitele.com

=C2=A0

=C2=A0

-----Original Message-----
From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]
Sent: Monday, May 15, 2017 11:12 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhov= sky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aana= nd@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <= Rotem.Cohen@ec= itele.com>
Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases

=C2=A0

=C2=A0

> On May 11, 2017, at 12:04 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.<= wbr>com> wrote:

>

> Hi all,

> I have a belated (but hopefully late is still better than n= ever) comment on path protection as defined in Section 2 of the draft.

>=C2=A0

> This second para in this section says:

>=C2=A0=C2=A0=C2=A0 A first protection strategy consists in e= xcluding any local repair

>

>=C2=A0=C2=A0=C2=A0 but instead use end-to-end path protectio= n where each SPRING path

> is

>

>=C2=A0=C2=A0=C2=A0 protected by a second disjoint SPRING pat= h.=C2=A0 In this case local

>

>=C2=A0=C2=A0=C2=A0 protection MUST NOT be used.

>

> First of all, I do not think that RFC 2119 language should = be used in Informational documents, especially in the documents that descri= be use cases.

=C2=A0

=C2=A0

this document is also a requirements document for the resiliency= use-case. RFC2119 terminology is perfectly usable and even more, it adds c= larity on what the solution is expected to provide.

=C2=A0

=C2=A0

> In addition, I specifically disagree with the quoted statem= ent above, because, from my POV:

> =C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Loca= l repair and end-to-end path protection can be combined for the same path

> =C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Such= a combination may be beneficial for the operators.

=C2=A0

=C2=A0

are you talking by experience or is it just something that came = into your mind ? I=E2=80=99d like to hear from operators using a combinatio= n of path and link protection.

=C2=A0

This document has been deeply reviewed also by operators and it = has been always obvious the little sense link protection has in case of pat= h protection.

=C2=A0

=C2=A0

> One possible way to combine the two is described below:<= /u>

>=C2=A0

> 1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 A pair of SR paths i= s set up between the given two nodes =E2=80=93 later referred to as source = and destination -=C2=A0 in the network. These paths are =E2=80=9CSR-disjoin= t=E2=80=9D in the sense that their =E2=80=9Cexplicit routes=E2=80=9D=C2=A0 do not have any common elements, be they nodes or ad= jacencies, with exclusion of the final destination

> 2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Local repair for the= se paths is enabled in the network. It is triggered by locally observed eve= nts (link failures etc.), applied by the nodes adjacent to the failure and = guarantees that, in the case of a link or node failure that is not specified in the explici= t route, traffic along the affected path would be restored within <X>= milliseconds

> 3.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 End-to-end liveness = monitoring is enabled for the two SR paths, and detects end-to-end failures= of these paths within <Y> milliseconds where Y >> X. In other = words, end-to-end liveness monitoring for these paths will ignore any failures that local repair can = fix, but will detect failures that cannot be locally repaired (e.g., failur= es of nodes or links that have been specified in the explicit route of one = of the paths

> 4.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 End-to-end liveness = monitoring triggers end-to-end path protection to be applied by the source = node in the following way:

> a.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If it recognizes bot= h paths as alive, one of them will carry the customer traffic, while the ot= her one will be idle. The rules for selecting the active path in this scena= rio may vary

> b.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If end-to-end failure of o= ne of these paths is detected while the other one remains alive, traffic wi= ll be carried across the live path

> c.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If end-to-end failur= e of both paths is detected (e.g., if the final destination node fails, or = if the network is partitioned), this is recognized as an unrecoverable fail= ure.

>=C2=A0

> From my POV the combination of local repair and end-to-end = protection for SR paths is one of a few possibilities to protect such paths= against failures of nodes and/or links that have been specified in their explicit routes. (Another option has been described in Node Prote= ction for SR-TE Paths, but this draft has expired).

>=C2=A0

> Do I miss something substantial?

=C2=A0

=C2=A0

to my view you created a use-case that doesn=E2=80=99t bring muc= h to the picture but I=E2=80=99d let operators to comment.

=C2=A0

s.

=C2=A0

=C2=A0

>=C2=A0

> Regards,

> Sasha

>=C2=A0

> Office: +972-39266302

> Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

> Email:=C2=A0=C2=A0 Alexander.Vainshtein@= ecitele.com

>=C2=A0

>

> ______________________________________________________= ________________

> _____

>

> This e-mail message is intended for the recipient only and = contains

> information which is CONFIDENTIAL and which may be propriet= ary to ECI

> Telecom. If you have received this transmission in error, p= lease

> inform us by e-mail, phone or fax, and then delete the orig= inal and all copies thereof.

> ______________________________________________________= ________________

> _____ _______________________________________________<= u>

> spring mailing list

> spring@ietf.org

> https://www.ietf.org/= mailman/listinfo/spring

=C2=A0


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This e-mail message is intended for the recipient only and contains informa= tion which is
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=C2=A0


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This e-mail message is intended for the recipient only and contains informa= tion which is
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transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original
and all copies thereof.
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=C2=A0


_________________________________________________________________= __________

This e-mail message is intended for the recipient only and contains informa= tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this
transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original
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--001a113d0366ad4f10054fa59aea-- From nobody Tue May 16 08:44:02 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4D56E12E957 for ; Tue, 16 May 2017 08:36:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pMkjMoYuWcGB for ; Tue, 16 May 2017 08:36:49 -0700 (PDT) Received: from mail-io0-x234.google.com (mail-io0-x234.google.com [IPv6:2607:f8b0:4001:c06::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5872D1293D9 for ; Tue, 16 May 2017 08:32:41 -0700 (PDT) Received: by mail-io0-x234.google.com with SMTP id f102so95716521ioi.2 for ; Tue, 16 May 2017 08:32:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=xpP2+ZFG6fuP4K8QFSDoNQhLVF5lRtlQuaY31Ruu4IE=; b=uof1C9PFEOjgTilsEiQC23flIe08lkLOnGYuUcKqt7hODfYdqHQPyI/pZJyFCc4OdA VMgd3jI6FltoCsHT97kFOxIIZx6MBprv5SpVFZCxTxg+U6Oo/SY1c/rUTntDGYiETWIr egV3QCn6ror1quGS3Afc8v+XUlTCm1FyCAJpQasJRkk18/FPeoLZmAxL1jo/xxwzYhF/ LNXt1eguZE1aBrcAMemTHDBejU0C5QlD1VLuDEm8otr4YsdiJiRpBdIWdH+aESoMCEW9 b+mkHcO3JRl+C2kAxQrkmMfc+pBxx3PSxJGSLpMAeznVarWdQ8D/Ipek9uNCUK8ewhM9 2Zsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=xpP2+ZFG6fuP4K8QFSDoNQhLVF5lRtlQuaY31Ruu4IE=; b=NQ5f4istmJ24Jl7NTuHnNwUoe/DNr6IpDNOOtGpzE5FxKgLKNHz6FP3i74zkj4tbmo N+5NYdByUsrfaw7w+OQ5EgX8IVzfPAKAqkAnvkWDm1iF8yze7tuagvT/P3dM60ycxxr/ p3uBKM7E0WGUpwnWL3WY8ka8Vxt5KV+3549kVNGPXI/5H8I9T6l4hT8HkK6IMXRBDlgU mw5x8TBfUh1HBI5SpqPeYMb1h9WPSNbyx24qN7LCJ6vcUh3zVUu1H3XOaiXpc7+SxK+r sIGA8Z3Yrv0JEyz31SwJu+6j/DlDhljn1Y/ULFtTtB9GJ3R7v1wFKjRlc4EwlL8wYyUL Xi7g== X-Gm-Message-State: AODbwcC8MtA4x65r9NcFfjV0dPz8NwAhTWyLASsei4qpG+CHwsKTLaBZ tOuHo4bGrjPBFG445dx8oOHMClomM4zd X-Received: by 10.107.142.86 with SMTP id q83mr12026495iod.195.1494948760501; Tue, 16 May 2017 08:32:40 -0700 (PDT) MIME-Version: 1.0 References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> <30960_1494926964_591AC674_30960_1681_1_9E32478DFA9976438E7A22F69B08FF921DDBA294@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: From: Rob Shakir Date: Tue, 16 May 2017 15:32:28 +0000 Message-ID: To: Alexander Vainshtein , "Stefano Previdi (sprevidi)" Cc: "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen , Stephane Litkowski Content-Type: multipart/alternative; boundary="94eb2c05e11ed42004054fa5e17f" Archived-At: X-Mailman-Approved-At: Tue, 16 May 2017 08:44:00 -0700 Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 15:36:51 -0000 --94eb2c05e11ed42004054fa5e17f Content-Type: text/plain; charset="UTF-8" > > As long as "mixed" use cases are not strictly prohibited in the draft (and > this was at least one possible interpretation of the text), I do not have > any issues with restricting it to just two "pure" use cases: > - End-to-end path protection with disabled local protection > - Local protection (of some kind) without end-to-end path protection. > Use cases drafts should never attempt to be exhaustive in terms of what they try and cover, but provide sufficient motivation for the features that are/were required in the technology that is developed as a response to them. In this case, the use case of path protection - especially with disjointness requirements - provides motivation for wanting to have a SID in the network that is explicitly not protected by local protection mechanisms. In RSVP-TE, we have the ability to set the "local protection requested" bit described in RFC4090 - which gives the head-end the ability to control the re-route behaviour of the LSP. This use case presents the operational case for the B-flag in the IGP extensions. Operators can, and will continue to, deploy things that (shockingly!) are not described in IETF use case documents. At this point, if we consider that this document provides some explanation of the features that are required in the protocol - let's go ahead and publish it. Due to the different technical and business requirements of different operators, almost certainly, someone will deploy some combination of these features, but I do not feel that we need to describe such unknown cases within this document. Kind regards, r. --94eb2c05e11ed42004054fa5e17f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
= As long as "mixed" use cases are not strictly prohibited in the d= raft (and this was at least one possible interpretation of the text), I do = not have any issues with restricting it to just two "pure" use ca= ses:
- End-to-end path protection with disabled local protection
- Local protection (of some kind) without end-to-end path protection.

Use cases drafts should never attempt to be = exhaustive in terms of what they try and cover, but provide sufficient moti= vation for the features that are/were required in the technology that is de= veloped as a response to them. In this case, the use case of path protectio= n - especially with disjointness requirements - provides motivation for wan= ting to have a SID in the network that is explicitly not protected by local= protection mechanisms.

In RSVP-TE, we have the ab= ility to set the "local protection requested" bit described in RF= C4090 - which gives the head-end the ability to control the re-route behavi= our of the LSP. This use case presents the operational case for the B-flag = in the IGP extensions.=C2=A0

Operators can, and wi= ll continue to, deploy things that (shockingly!) are not described in IETF = use case documents. At this point, if we consider that this document provid= es some explanation of the features that are required in the protocol - let= 's go ahead and publish it. Due to the different technical and business= requirements of different operators, almost certainly, someone will deploy= some combination of these features, but I do not feel that we need to desc= ribe such unknown cases within this document.

Kind= regards,
r.
--94eb2c05e11ed42004054fa5e17f-- From nobody Tue May 16 09:15:48 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E825A12EBE0; Tue, 16 May 2017 09:15:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.688 X-Spam-Level: X-Spam-Status: No, score=-2.688 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6_i0tEpr2fNt; Tue, 16 May 2017 09:15:42 -0700 (PDT) Received: from mail-oi0-x22b.google.com (mail-oi0-x22b.google.com [IPv6:2607:f8b0:4003:c06::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5C650129544; Tue, 16 May 2017 09:11:20 -0700 (PDT) Received: by mail-oi0-x22b.google.com with SMTP id h4so31414676oib.3; Tue, 16 May 2017 09:11:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=0YkEofnJ6nZrsBj692mBaHJsXY2dtnCKGOfttf3OHm0=; b=QllRLs+/EO6A1aVmbHpk2RPHJBKzNBX4asYIbn3Yapa0z9P2zUw2R6bdn4ohskPrFC eAvB2RFPJfU1vdmtVkrnfmXerxQ5kZiCDB1zAJsu/HBrCWQyG5C1pcb8CveOor1Zufen YY5hULsbcPJkqRI9qRXCzOmnDQ4LSwt8o8K+1EIssxpif0upEUR8eUxGCki5pCQYIvLU ssZ8YHQjlUZjRHP1yC/Gv94CRUcJcYnRE//K7Q3Ph3iF8R9Tt5dK+l5fqGQZ0MpsJy72 SJezpLBDi1QLy1mMm4UCfM0wpOdiyjmFPkffwv78HE8HfbNmOmcwdlOEbdfiPVVHyvQH tRDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=0YkEofnJ6nZrsBj692mBaHJsXY2dtnCKGOfttf3OHm0=; b=MIZ3fP9a3A4eTtieNrUN5JQKvFDFpe0CKuLXbF1Xil1SeG4a3bQ51pilgkZkl5kWWm t0TlfQLnHJKA54HpJeBlfFPbm928txgBOT7G8CUl6MH8A1QZAqtyJ4hwan41BeJASJgU b8lCtWxrM6udyDe358M3w3OOC2AAntAdOxD4aLjVrFX1lYhWthtEyajlByMe1yQSHAaS 8rd3papKcKsgs72pjAs8hx9btlh6r/SOHtIdXnQScYRevkxw98fN5yw32NLoScZWkBNU lH+IjzuUCUqSTL3Uv/kLkoPlgquu+brDI8qEhLRxkLDoMP8mdjIKEbWCg/d3eVgXeEEv 5oqw== X-Gm-Message-State: AODbwcA7drp49bFjX5WopdLGrJdZ3goGAnxHaWg5lXK7hFQ+mJOfMhuv ixKj0dOTPeJdRLF+kCoMgwbmR8XY8w== X-Received: by 10.202.221.215 with SMTP id u206mr2164092oig.139.1494951079440; Tue, 16 May 2017 09:11:19 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.25.169 with HTTP; Tue, 16 May 2017 09:11:18 -0700 (PDT) In-Reply-To: References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> From: Muthu Arul Mozhi Perumal Date: Tue, 16 May 2017 21:41:18 +0530 Message-ID: To: Alexander Vainshtein Cc: "Stefano Previdi (sprevidi)" , "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-spring-resiliency-use-cases@ietf.org" , Sidd Aanand , Ron Sdayoor , Rotem Cohen Content-Type: multipart/alternative; boundary="001a113d5d400bf917054fa66cdb" Archived-At: Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 16:15:47 -0000 --001a113d5d400bf917054fa66cdb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sasha, On Tue, May 16, 2017 at 4:29 PM, Alexander Vainshtein < Alexander.Vainshtein@ecitele.com> wrote: > Muthu, > > An additional clarification: > > =C2=B7 If the link BC were OK, B could pop B from the stack and s= end > packets to C with just D in the stack > > =C2=B7 When the link BC fails, B will leave the stack as (CD) IMH= O =E2=80=93 *it > would be just trying to bypass the failed link BC*. > > =C2=B7 If the failure of BC as perceived by B was cause by the fa= ilure > of node B, such a failure could not be recovered by local protection. *Th= is > is exactly the scenario where local protection for shortest SR path > comprising an SR-TE path should be augmented by end-to-end path protectio= n* > . > =E2=80=8BIf node B fails, the e2e path monitoring at node A would anyway d= etect the failure and switch the traffic over an alternate disjoint path...=E2=80= =8B > > > Regarding combination of local protection with end-to-end protection for > RSVP-TE =E2=80=93 AFAIK this was never used because it would not provide = any added > value. > > In SR this is not so because local protection is usually faster (and > scales better) than end-to-end protection, but, as opposed to RSVP-TE, > there are failures that local protection cannot fix. > =E2=80=8BAgree, there are failures in SR-TE that local protection cannot fi= x as desired, so it calls for e2e path protection. However, enabling them together is not always the best approach since it can introduce other problems to solve. Regards, Muthu > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Alexander Vainshtein > *Sent:* Tuesday, May 16, 2017 1:42 PM > *To:* 'Muthu Arul Mozhi Perumal' > *Cc:* Stefano Previdi (sprevidi) ; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; draft-ietf-spring-resiliency-u > se-cases@ietf.org; Sidd Aanand ; Ron Sdayoor < > Ron.Sdayoor@ecitele.com>; Rotem Cohen > *Subject:* RE: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Muthu, > > Again lots of thanks for a prompt response. I still do not think a loop > would really form because: > > =C2=B7 A sends packet to its local next hop for B with the stack = (B, > C, D) > > =C2=B7 B receives this packet with the stack (C, D), but the link= C > has failed. So B sends to its next hop for it back to A *with stack (C,D)= * > > =C2=B7 A now sends the packet to its next hop for C with the same > stack. > > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com > ] > *Sent:* Tuesday, May 16, 2017 1:25 PM > > *To:* Alexander Vainshtein > *Cc:* Stefano Previdi (sprevidi) ; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; draft-ietf-spring-resiliency-u > se-cases@ietf.org; Sidd Aanand ; Ron Sdayoor < > Ron.Sdayoor@ecitele.com>; Rotem Cohen > *Subject:* Re: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > Muthu, > > Lots of thanks for a prompt response. > > > > I do not think that the loop you have described would actually appear in > the scenario you=E2=80=99ve described. > > > > To the best of my understanding of TI-LFA, B would send the traffic back > to A *complete with an explicit route that says B**=C3=A0** A**=C3=A0** C= **=C3=A0**D*, > and no loop would be formed. > > > > Not necessarily. B was asked to send the traffic to C and knows that if i= t > sends the traffic to A, then A will send it to C over the shortest path > (i.e from B's perspective only the labeled next-hop changes). > Unfortunately, A has an explicit route pointing back to B (over the SR-TE > tunnel T1) that B isn't aware of. If B does strict explicit route for > everything, then B can run out of its MSD.. > > > > =E2=80=8B > > > > Similar =E2=80=9Cloops=E2=80=9D can happen also in MPLS FRR with RSVP-TE = when the PLR > sends some traffic back - but it sends it with the suitable label stack = of > the bypass tunnel so that eventually it reaches the MP. > > > > =E2=80=8BAre there existing deployments where both e2e path protection an= d local > protection are used together with RSVP-TE? > > > > Regards, > > Muthu > > > > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com] > *Sent:* Tuesday, May 16, 2017 12:34 PM > *To:* Alexander Vainshtein > *Cc:* Stefano Previdi (sprevidi) ; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; draft-ietf-spring-resiliency-u > se-cases@ietf.org; Sidd Aanand ; Ron Sdayoor < > Ron.Sdayoor@ecitele.com>; Rotem Cohen > > > *Subject:* Re: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Using end-to-end path protection together with local protection can resul= t > in traffic loops. Consider the foll. topology: > > > > B-----C > > | / \ > > | / \ > > | / \ > > | / \D----+ > > A/ Z (CE) > > \ F----+ > > \ / > > \ / > > \ / > > \E/ > > > > - All links are of equal cost. > > - A, D and F are BGP peers. > > - Z is a dual-homed CE. > > > > A resolves its BGP next-hop D over the SR-TE tunnel T1. > > T1: A->B, B->C, C->D (loosely routed) > > > > Suppose A has enabled end-to-end path protection over tunnel T1 and B has > TI-LFA enabled, and the detection timers are configured as described in > your previous email. If the BC link goes down, B will immediately start > rerouting the traffic via A (in FRR fashion) creating a loop b/w A and B. > > > > A solution would be to make the A-B link ineligible for TI-LFA backup > computation at B. However, managing this network-wide could become > operational expensive. Hence, deploying one of end-to-end path protection > or local protection with sufficiently short detection timers keeps things > simple, IMHO. > > > > Regards, > > Muthu > > > > On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Regards, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > *From:* Alexander Vainshtein > *Sent:* Tuesday, May 16, 2017 11:28 AM > *To:* 'Stefano Previdi (sprevidi)' > *Cc:* draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > *Subject:* RE: [spring] A belated comment on end-to-end path protection > in draft-ietf-spring-resiliency-use-cases > > > > Stefano, > > Lots of thanks for a prompt response. > > > > A couple of short comments if you do not mind: > > > > *Using 2119 language in a "use cases" document*: > > 1. Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 m= ean that the > definition is an absolute prohibition of the specification=E2=80=9D > > 2. I agree that the use case document defines which scenarios > should be addressed, but I do not see how it can impose an absolute > prohibition on a certain scenario. > > > > *Little sense link protection has in the case of path protection*: > > 1. This was definitely correct for traditional traffic engineering > because the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) cou= ld be easily > differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D. > > 2. In addition, traditional local protection (e.g., MPLS FRR using > RSVP-TE) could deal with link and node failures regardless of whether the > failed link or node appeared in the ERO of the protected path. > > 3. IMHO and FWIW, with SR the situation is quite different: > > o The shortest traffic paths not only coexist with engineered traffic > paths: the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the= former. > > o Path protection cannot be applied to shortest traffic paths so they > must rely on local protection > > o Local protection in the case of failure of a node or link that > appears in the ERO of an engineered SR path is highly non-trivial at best= , > so path protection for the engineered LSPs looks like a preferred solutio= n > to me. > > I fully agree with you that the operators deploying SR should provide > feedback on this point based on actual operational experience. > > Meanwhile I doubt that *a priori* declaring some use cases as absolutely > prohibited is the right thing to do. > > > > My 2c, > > Sasha > > > > Office: +972-39266302 <+972%203-926-6302> > > Cell: +972-549266302 <+972%2054-926-6302> > > Email: Alexander.Vainshtein@ecitele.com > > > > > > -----Original Message----- > From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com > ] > Sent: Monday, May 15, 2017 11:12 AM > To: Alexander Vainshtein > Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; > Shell Nakash ; Michael Gorokhovsky < > Michael.Gorokhovsky@ecitele.com>; Sidd Aanand ; > Ron Sdayoor ; Rotem Cohen < > Rotem.Cohen@ecitele.com> > Subject: Re: [spring] A belated comment on end-to-end path protection in > draft-ietf-spring-resiliency-use-cases > > > > > > > On May 11, 2017, at 12:04 PM, Alexander Vainshtein < > Alexander.Vainshtein@ecitele.com> wrote: > > > > > > Hi all, > > > I have a belated (but hopefully late is still better than never) commen= t > on path protection as defined in Section 2 of the draft. > > > > > > This second para in this section says: > > > A first protection strategy consists in excluding any local repair > > > > > > but instead use end-to-end path protection where each SPRING path > > > is > > > > > > protected by a second disjoint SPRING path. In this case local > > > > > > protection MUST NOT be used. > > > > > > First of all, I do not think that RFC 2119 language should be used in > Informational documents, especially in the documents that describe use > cases. > > > > > > this document is also a requirements document for the resiliency use-case= . > RFC2119 terminology is perfectly usable and even more, it adds clarity on > what the solution is expected to provide. > > > > > > > In addition, I specifically disagree with the quoted statement above, > because, from my POV: > > > =C2=B7 Local repair and end-to-end path protection can be combi= ned > for the same path > > > =C2=B7 Such a combination may be beneficial for the operators. > > > > > > are you talking by experience or is it just something that came into your > mind ? I=E2=80=99d like to hear from operators using a combination of pat= h and link > protection. > > > > This document has been deeply reviewed also by operators and it has been > always obvious the little sense link protection has in case of path > protection. > > > > > > > One possible way to combine the two is described below: > > > > > > 1. A pair of SR paths is set up between the given two nodes =E2= =80=93 > later referred to as source and destination - in the network. These path= s > are =E2=80=9CSR-disjoint=E2=80=9D in the sense that their =E2=80=9Cexplic= it routes=E2=80=9D do not have > any common elements, be they nodes or adjacencies, with exclusion of the > final destination > > > 2. Local repair for these paths is enabled in the network. It is > triggered by locally observed events (link failures etc.), applied by the > nodes adjacent to the failure and guarantees that, in the case of a link = or > node failure that is not specified in the explicit route, traffic along t= he > affected path would be restored within milliseconds > > > 3. End-to-end liveness monitoring is enabled for the two SR paths= , > and detects end-to-end failures of these paths within milliseconds > where Y >> X. In other words, end-to-end liveness monitoring for these > paths will ignore any failures that local repair can fix, but will detect > failures that cannot be locally repaired (e.g., failures of nodes or link= s > that have been specified in the explicit route of one of the paths > > > 4. End-to-end liveness monitoring triggers end-to-end path > protection to be applied by the source node in the following way: > > > a. If it recognizes both paths as alive, one of them will carry > the customer traffic, while the other one will be idle. The rules for > selecting the active path in this scenario may vary > > > b. If end-to-end failure of one of these paths is detected while > the other one remains alive, traffic will be carried across the live path > > > c. If end-to-end failure of both paths is detected (e.g., if the > final destination node fails, or if the network is partitioned), this is > recognized as an unrecoverable failure. > > > > > > From my POV the combination of local repair and end-to-end protection > for SR paths is one of a few possibilities to protect such paths against > failures of nodes and/or links that have been specified in their explicit > routes. (Another option has been described in Node Protection for SR-TE > Paths, but this draft has expired). > > > > > > Do I miss something substantial? > > > > > > to my view you created a use-case that doesn=E2=80=99t bring much to the = picture > but I=E2=80=99d let operators to comment. > > > > s. > > > > > > > > > > Regards, > > > Sasha > > > > > > Office: +972-39266302 <+972%203-926-6302> > > > Cell: +972-549266302 <+972%2054-926-6302> > > > Email: Alexander.Vainshtein@ecitele.com > > > > > > > > > ______________________________________________________________________ > > > _____ > > > > > > This e-mail message is intended for the recipient only and contains > > > information which is CONFIDENTIAL and which may be proprietary to ECI > > > Telecom. If you have received this transmission in error, please > > > inform us by e-mail, phone or fax, and then delete the original and all > copies thereof. > > > ______________________________________________________________________ > > > _____ _______________________________________________ > > > spring mailing list > > > spring@ietf.org > > > https://www.ietf.org/mailman/listinfo/spring > > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > > > > ____________________________________________________________ > _______________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and then > delete the original > and all copies thereof. > ____________________________________________________________ > _______________ > --001a113d5d400bf917054fa66cdb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Sasha,
=
On Tue, May 16, 2017 at 4:29 PM, Alexander V= ainshtein <Alexander.Vainshtein@ecitele.com> wrote:

Muthu,

An additional clarification:

= =C2=B7=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If the = link BC were OK, B could pop B from the stack and send packets to C with ju= st D in the stack

= =C2=B7=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 When th= e link BC fails, B will leave the stack as (CD) IMHO =E2=80=93 it would be =C2=A0just trying to bypass the failed link BC.

= =C2=B7=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If the = failure of BC as perceived by B was cause by the failure of node B, such a = failure could not be recovered by local protection. This is exactly the scenario where local protection for shortest SR p= ath comprising an SR-TE path should be augmented by end-to-end path protect= ion.

=E2=80=8BIf node B fails, the e2e path monitoring at =C2=A0node= A would anyway detect the failure and switch the traffic over an alternate= disjoint path...=E2=80=8B

=C2=A0

Regarding combination of local protec= tion with end-to-end protection for RSVP-TE =E2=80=93 AFAIK this was never = used because it would not provide any added value.

In SR this is not so because local pr= otection is usually faster (and scales better) than end-to-end protection, = but, as opposed to RSVP-TE, there are failures that local protection cannot fix.

=
=E2=80=8BAgree, there are failures in SR-= TE that local protection cannot fix as desired, so it calls for e2e path pr= otection. However, enabling them together is not always the best approach s= ince it can introduce other problems to solve.

=
Regards,
Muthu
=C2=A0

=

=C2=A0

Regards,

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <= a href=3D"tel:+972%2054-926-6302" value=3D"+972549266302" target=3D"_blank"= >+972-549266302

Email:=C2=A0=C2=A0 Alexander.Vainshtein@ec= itele.com

=C2=A0

From: Alexander Vainshtein
Sent: Tuesday, May 16, 2017 1:42 PM
To: 'Muthu Arul Mozhi Perumal' <muthu.arul@gmail.com>
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele= .com>; Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>= ;; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd= Aanand <Si= dd.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject: RE: [spring] A belated comment on end-to-end p= ath protection in draft-ietf-spring-resiliency-use-cases=

=C2=A0

Muthu,

Again lots of thanks for a prompt res= ponse. I still do not think a loop would really form because:=

= =C2=B7=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 A sends= packet to its local next hop for B with the stack (B, C, D)<= /span>

= =C2=B7=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 B recei= ves this packet with the stack (C, D), but the link C has failed. So B send= s to its next hop for it back to A with stack (C,D)

= =C2=B7=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 A now s= ends the packet to its next hop for C with the same stack.

=C2=A0

Regards,<= /p>

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <= a href=3D"tel:+972%2054-926-6302" value=3D"+972549266302" target=3D"_blank"= >+972-549266302

Email:=C2=A0=C2=A0 Alexa= nder.Vainshtein@ecitele.com

=C2=A0

From: Muthu Arul Mozhi Peruma= l [mailto:muthu.a= rul@gmail.com]
Sent: Tuesday, May 16, 2017 1:25 PM


To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>= ;
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; spring@ietf.org; S= hell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhovsky <Michael.Gorokhovsky@= ecitele.com>; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd = Aanand <Sid= d.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject: Re: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases
<= p>

=C2=A0

On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein <Alexander.Vainsht= ein@ecitele.com> wrote:

Muthu,

Lots of thanks for a prompt response.=

=C2=A0

I do not think that the loop you have= described would actually appear in the scenario you=E2=80=99ve described.<= /span>

=C2=A0

To the best of my understanding of TI= -LFA, B would send the traffic back to A complete with an explicit route that says B=C3=A0<= span style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;c= olor:#44546a"> A=C3=A0 C=C3=A0D, and no loop would be formed. =C2=A0

=C2=A0

Not necessarily. B was asked to send the traffic to C and knows that i= f it sends the traffic to A, then A will send it to C over the shortest pat= h (i.e from B's perspective only the labeled next-hop changes). Unfortunately, A has an explicit route pointing back to B (over = the SR-TE tunnel T1) that B isn't aware of. If B does strict explicit r= oute for everything, then B can run out of its MSD..=C2=A0

=C2=A0

=E2=80=8B

=C2=A0

Similar =E2=80=9Cloops=E2=80=9D can h= appen also in MPLS FRR with RSVP-TE when the PLR sends some traffic back=C2= =A0 - but it sends it with the suitable label stack of the bypass tunnel so that eve= ntually it reaches the MP.

=C2=A0

=E2=80=8BAre there existing deployments where both e2e path protection= and local protection are used together with RSVP-TE?<= /p>

=C2=A0

Regards,

Muthu

=C2=A0

=C2=A0

Regards,

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexa= nder.Vainshtein@ecitele.com

=C2=A0

From: Muthu Arul Mozhi Perumal [mail= to:muthu.arul@gma= il.com]
Sent: Tuesday, May 16, 2017 12:34 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>= ;
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; spring@ietf.org; S= hell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhovsky <Michael.Gorokhovsky@= ecitele.com>; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd Aanand <<= a href=3D"mailto:Sidd.Aanand@ecitele.com" target=3D"_blank">Sidd.Aanand@eci= tele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rot= em.Cohen@ecitele.com>


Subject: Re: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases

=C2=A0

= Using end-to-end path protection together with local protection can result = in traffic loops. Consider the foll. topology:

=C2=A0

= B-----C =C2=A0=C2=A0

= | =C2=A0 =C2=A0/ \

= | =C2=A0 / =C2=A0 \=C2=A0

= | =C2=A0/ =C2=A0 =C2=A0 \

= | / =C2=A0 =C2=A0 =C2=A0 \D----+=C2=A0

= A/ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Z (CE)<= /u>

= =C2=A0\ =C2=A0 =C2=A0 =C2=A0 =C2=A0 F----+=C2=A0

= =C2=A0 \ =C2=A0 =C2=A0 =C2=A0 /

= =C2=A0 =C2=A0\ =C2=A0 =C2=A0 /

= =C2=A0 =C2=A0 \ =C2=A0 /=C2=A0

= =C2=A0 =C2=A0 =C2=A0\E/

=C2=A0

= - All links are of equal cost.

= - A, D and F are BGP peers.

= - Z is a dual-homed CE.

=C2=A0

= A resolves its BGP next-hop D over the SR-TE tunnel T1.

= T1: A->B, B->C, C->D (loosely routed)

=C2=A0

= Suppose A has enabled end-to-end path protection over tunnel T1 and B has T= I-LFA enabled, and the detection timers are configured as described in your previous email. If the BC link goes down, B will immediately start= rerouting the traffic via A (in FRR fashion) creating a loop b/w A and B.<= /span>

=C2=A0

= A solution would be to make the A-B link ineligible for TI-LFA backup compu= tation at B. However, managing this network-wide could become operational expensive. Hence, deploying one of end-to-end path protection = or local protection with sufficiently short detection timers keeps things s= imple, IMHO.

=C2=A0

= Regards,

= Muthu

=C2=A0

On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtei= n <Alexander.Vainshtein@ecitele.com> wrote:

=C2=A0

=C2=A0

Regards,=

Sasha=

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexa= nder.Vainshtein@ecitele.com

=C2=A0

From: Alexander Vainshtein
Sent: Tuesday, May 16, 2017 11:28 AM
To: 'Stefano Previdi (sprevidi)' <sprevidi@cisco.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhov= sky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aana= nd@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <= Rotem.Cohen@ec= itele.com>
Subject: RE: [spring] A belated comment on end-to-end path protectio= n in draft-ietf-spring-resiliency-use-cases

=C2=A0

Stefano,

Lots of thanks for a prompt response.

=C2=A0

A couple of short comments if you do not mi= nd:

=C2=A0

Using 2119 language in a "use ca= ses" document:

1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 mean that= the definition is an absolute prohibition of the specification=E2=80=9D=

2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I agree that the use case document defines which scenarios should be add= ressed, but I do not see how it can impose an absolute prohibition on a cer= tain scenario.

=C2=A0

Little sense link protection has in t= he case of path protection:

1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This was definitely correct for traditional traffic engineering because = the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) could be easi= ly differentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D.

2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 In addition, traditional local protection (e.g., MPLS FRR using RSVP-TE)= could deal with link and node failures regardless of whether the failed li= nk or node appeared in the ERO of the protected path.

3.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 IMHO and FWIW, with SR=C2=A0 the situation is quite different:=

o=C2=A0=C2=A0 The shortest traffic paths not only coexist with engineered traffic paths: = the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the former.<= u>

o=C2=A0=C2=A0 Path protection cannot be applied to shortest traffic paths so they must re= ly on local protection

o=C2=A0=C2=A0 Local protection in the case of failure of a node or link that appears in t= he ERO of an engineered SR path is highly non-trivial at best, so path prot= ection for the engineered LSPs looks like a preferred solution to me.

I fully agree with you that the operators deploying SR should provide feedb= ack on this point based on actual operational experience.

Meanwhile I doubt that a priori declaring some use cases as absolute= ly prohibited is the right thing to do.

=C2=A0

My 2c,

Sasha

=C2=A0

Office: +972-39266302

Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

Email:=C2=A0=C2=A0 Alexander.Vainshtein@ecitele.com

=C2=A0

=C2=A0

-----Original Message-----
From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]
Sent: Monday, May 15, 2017 11:12 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhov= sky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aana= nd@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <= Rotem.Cohen@ec= itele.com>
Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases

=C2=A0

=C2=A0

> On May 11, 2017, at 12:04 PM, Alexande= r Vainshtein <Alexander= .Vainshtein@ecitele.com> wrote:

>

> Hi all,

> I have a belated (but hopefully late i= s still better than never) comment on path protection as defined in Section= 2 of the draft.

>=C2=A0

> This second para in this section says:=

>=C2=A0=C2=A0=C2=A0 A first protection s= trategy consists in excluding any local repair

>

>=C2=A0=C2=A0=C2=A0 but instead use end-= to-end path protection where each SPRING path

> is

>

>=C2=A0=C2=A0=C2=A0 protected by a secon= d disjoint SPRING path.=C2=A0 In this case local

>

>=C2=A0=C2=A0=C2=A0 protection MUST NOT = be used.

>

> First of all, I do not think that RFC = 2119 language should be used in Informational documents, especially in the = documents that describe use cases.

=C2=A0

=C2=A0

this document is also a requirements docume= nt for the resiliency use-case. RFC2119 terminology is perfectly usable and= even more, it adds clarity on what the solution is expected to provide.=

=C2=A0

=C2=A0

> In addition, I specifically disagree w= ith the quoted statement above, because, from my POV:

> =C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 Local repair and end-to-end path protection can be combi= ned for the same path

> =C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 Such a combination may be beneficial for the operators.<= u>

=C2=A0

=C2=A0

are you talking by experience or is it just= something that came into your mind ? I=E2=80=99d like to hear from operato= rs using a combination of path and link protection.

=C2=A0

This document has been deeply reviewed also= by operators and it has been always obvious the little sense link protecti= on has in case of path protection.

=C2=A0

=C2=A0

> One possible way to combine the two is= described below:

>=C2=A0

> 1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= A pair of SR paths is set up between the given two nodes =E2=80=93 later r= eferred to as source and destination -=C2=A0 in the network. These paths ar= e =E2=80=9CSR-disjoint=E2=80=9D in the sense that their =E2=80=9Cexplicit routes=E2=80=9D=C2=A0 do not have any common elements, be they nodes or ad= jacencies, with exclusion of the final destination

> 2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Local repair for these paths is enabled in the network. It is triggered by= locally observed events (link failures etc.), applied by the nodes adjacen= t to the failure and guarantees that, in the case of a link or node failure that is not specified in the explici= t route, traffic along the affected path would be restored within <X>= milliseconds

> 3.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= End-to-end liveness monitoring is enabled for the two SR paths, and detect= s end-to-end failures of these paths within <Y> milliseconds where Y = >> X. In other words, end-to-end liveness monitoring for these paths will ignore any failures that local repair can = fix, but will detect failures that cannot be locally repaired (e.g., failur= es of nodes or links that have been specified in the explicit route of one = of the paths

> 4.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= End-to-end liveness monitoring triggers end-to-end path protection to be a= pplied by the source node in the following way:

> a.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= If it recognizes both paths as alive, one of them will carry the customer = traffic, while the other one will be idle. The rules for selecting the acti= ve path in this scenario may vary

> b.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If en= d-to-end failure of one of these paths is detected while the other one rema= ins alive, traffic will be carried across the live path

> c.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= If end-to-end failure of both paths is detected (e.g., if the final destin= ation node fails, or if the network is partitioned), this is recognized as = an unrecoverable failure.

>=C2=A0

> From my POV the combination of local r= epair and end-to-end protection for SR paths is one of a few possibilities = to protect such paths against failures of nodes and/or links that have been= specified in their explicit routes. (Another option has been described in Node Prote= ction for SR-TE Paths, but this draft has expired).

>=C2=A0

> Do I miss something substantial?

=C2=A0

=C2=A0

to my view you created a use-case that does= n=E2=80=99t bring much to the picture but I=E2=80=99d let operators to comm= ent.

=C2=A0

s.

=C2=A0

=C2=A0

>=C2=A0

> Regards,

> Sasha

>=C2=A0

> Office: +972-39266302

> Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +972-549266302

> Email:=C2=A0=C2=A0 Alexander.Vainshtein@= ecitele.com

>=C2=A0

>

> _________________________________= _____________________________________

> _____

>

> This e-mail message is intended for th= e recipient only and contains

> information which is CONFIDENTIAL and = which may be proprietary to ECI

> Telecom. If you have received this tra= nsmission in error, please

> inform us by e-mail, phone or fax, and= then delete the original and all copies thereof.

> _________________________________= _____________________________________

> _____ _______________________________________________

> spring mailing list

> spring@ietf.org

> https://www.ietf.org/= mailman/listinfo/spring

=C2=A0


_________________________________________________________________= __________

This e-mail message is intended for the recipient only and contains informa= tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this
transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original
and all copies thereof.
_________________________________________________________________= __________


_______________________________________________
spring mailing list
spring@ietf.org = https://www.ietf.org/mailman/listinfo/spring

=C2=A0


_________________________________________________________________= __________

This e-mail message is intended for the recipient only and contains informa= tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this
transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original
and all copies thereof.
_________________________________________________________________= __________

=C2=A0


_________________________________________________________________= __________

This e-mail message is intended for the recipient only and contains informa= tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this
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[66.171.169.34]) by smtp.gmail.com with ESMTPSA id n22sm1184651itg.25.2017.05.16.09.57.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 May 2017 09:57:47 -0700 (PDT) User-Agent: Microsoft-MacOutlook/f.21.0.170409 Date: Tue, 16 May 2017 09:57:45 -0700 From: Jeff Tantsura To: Alexander Vainshtein CC: "spring@ietf.org" , "draft-ietf-spring-resiliency-use-cases@ietf.org" Message-ID: Thread-Topic: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases References: <4CE8B71E-1CB7-43AF-9DA3-D936E030A2CA@cisco.com> <15C96387-0796-4E0A-9C79-E5B6576D2829@gmail.com> In-Reply-To: <15C96387-0796-4E0A-9C79-E5B6576D2829@gmail.com> Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3577773466_1291860587" Archived-At: Subject: Re: [spring] A belated comment on end-to-end path protection in draft-ietf-spring-resiliency-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 May 2017 17:02:33 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3577773466_1291860587 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable resending with reduced number of recipients. =20 Cheers, Jeff =20 Sasha, =20 Don=E2=80=99t forget =E2=80=93 RSVP-TE FRR has explicit signaling and state associated = with it, as well as well defined state transitions, SR on contrary doesn=E2=80=99t= .=20 Changes in topology (link/node down events) are not communicated back to th= e head-end directly but rather flooded thru a routing protocol (for sake of = this discussion lets ignore the possibility of running fast failure detectio= n over SR tunnels). Trying to derive operation state at PLR based on transitional changes in a = routing protocol is a rather complicated task. =20 Cheers, Jeff =20 =20 From: spring on behalf of Alexander Vainshtein Date: Tuesday, May 16, 2017 at 09:23 To: Muthu Arul Mozhi Perumal Cc: "spring@ietf.org" , Shell Nakash , Michael Gorokhovsky , "draft-ietf-sp= ring-resiliency-use-cases@ietf.org" , Sidd Aanand , "Stefano Previdi (sprevidi= )" , Ron Sdayoor , Rotem Cohen = Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases =20 Muthu, Again lots of thanks for a prompt response. =20 We seem to agree on the following points: =C2=B7 In SR some failures cannot be handled by local protection (actua= lly, there is an expired draft that defines how this could be done, but it i= ntroduces serious complexity) =C2=B7 Combining local protection with end-to-end path protection is po= ssible. In particular, such a combination speeds up handling of failures tha= t that can be handled locally while also handling failures that could not be= addressed by local protection. =20 Whether combining both forms of protection carries with it some new problem= s or not is a different story. =20 Regards, Sasha =20 Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com =20 From: Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com]=20 Sent: Tuesday, May 16, 2017 7:11 PM To: Alexander Vainshtein Cc: Stefano Previdi (sprevidi) ; spring@ietf.org; Shell= Nakash ; Michael Gorokhovsky ; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd Aanand = ; Ron Sdayoor ; Rotem Cohe= n Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases =20 Sasha, =20 On Tue, May 16, 2017 at 4:29 PM, Alexander Vainshtein wrote: Muthu, An additional clarification: =C2=B7 If the link BC were OK, B could pop B from the stack and send pa= ckets to C with just D in the stack =C2=B7 When the link BC fails, B will leave the stack as (CD) IMHO =E2=80=93 = it would be just trying to bypass the failed link BC. =C2=B7 If the failure of BC as perceived by B was cause by the failure = of node B, such a failure could not be recovered by local protection. This i= s exactly the scenario where local protection for shortest SR path comprisin= g an SR-TE path should be augmented by end-to-end path protection. =E2=80=8BIf node B fails, the e2e path monitoring at node A would anyway detect = the failure and switch the traffic over an alternate disjoint path...=E2=80=8B =20 Regarding combination of local protection with end-to-end protection for RS= VP-TE =E2=80=93 AFAIK this was never used because it would not provide any added v= alue.=20 In SR this is not so because local protection is usually faster (and scales= better) than end-to-end protection, but, as opposed to RSVP-TE, there are f= ailures that local protection cannot fix. =20 =E2=80=8BAgree, there are failures in SR-TE that local protection cannot fix as d= esired, so it calls for e2e path protection. However, enabling them together= is not always the best approach since it can introduce other problems to so= lve. =20 Regards, Muthu =20 =20 Regards, Sasha =20 Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com =20 From: Alexander Vainshtein=20 Sent: Tuesday, May 16, 2017 1:42 PM To: 'Muthu Arul Mozhi Perumal' Cc: Stefano Previdi (sprevidi) ; spring@ietf.org; Shell= Nakash ; Michael Gorokhovsky ; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd Aanand = ; Ron Sdayoor ; Rotem Cohe= n Subject: RE: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases =20 Muthu, Again lots of thanks for a prompt response. I still do not think a loop wou= ld really form because: =C2=B7 A sends packet to its local next hop for B with the stack (B, C,= D) =C2=B7 B receives this packet with the stack (C, D), but the link C has= failed. So B sends to its next hop for it back to A with stack (C,D) =C2=B7 A now sends the packet to its next hop for C with the same stack= . =20 Regards, Sasha =20 Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com =20 From: Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com]=20 Sent: Tuesday, May 16, 2017 1:25 PM To: Alexander Vainshtein Cc: Stefano Previdi (sprevidi) ; spring@ietf.org; Shell= Nakash ; Michael Gorokhovsky ; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd Aanand = ; Ron Sdayoor ; Rotem Cohe= n Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases =20 On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein wrote: Muthu, Lots of thanks for a prompt response. =20 I do not think that the loop you have described would actually appear in th= e scenario you=E2=80=99ve described. =20 To the best of my understanding of TI-LFA, B would send the traffic back to= A complete with an explicit route that says B=C3=A0 A=C3=A0 C=C3=A0D, and no loop would= be formed. =20 =20 Not necessarily. B was asked to send the traffic to C and knows that if it = sends the traffic to A, then A will send it to C over the shortest path (i.e= from B's perspective only the labeled next-hop changes). Unfortunately, A h= as an explicit route pointing back to B (over the SR-TE tunnel T1) that B is= n't aware of. If B does strict explicit route for everything, then B can run= out of its MSD..=20 =20 =E2=80=8B =20 Similar =E2=80=9Cloops=E2=80=9D can happen also in MPLS FRR with RSVP-TE when the PLR s= ends some traffic back - but it sends it with the suitable label stack of t= he bypass tunnel so that eventually it reaches the MP. =20 =E2=80=8BAre there existing deployments where both e2e path protection and local = protection are used together with RSVP-TE? =20 Regards, Muthu =20 =20 Regards, Sasha =20 Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com =20 From: Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com]=20 Sent: Tuesday, May 16, 2017 12:34 PM To: Alexander Vainshtein Cc: Stefano Previdi (sprevidi) ; spring@ietf.org; Shell= Nakash ; Michael Gorokhovsky ; draft-ietf-spring-resiliency-use-cases@ietf.org; Sidd Aanand = ; Ron Sdayoor ; Rotem Cohe= n Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases =20 Using end-to-end path protection together with local protection can result = in traffic loops. Consider the foll. topology: =20 B-----C =20 | / \ | / \=20 | / \ | / \D----+=20 A/ Z (CE) \ F----+=20 \ / \ / \ /=20 \E/ =20 - All links are of equal cost. - A, D and F are BGP peers. - Z is a dual-homed CE. =20 A resolves its BGP next-hop D over the SR-TE tunnel T1. T1: A->B, B->C, C->D (loosely routed) =20 Suppose A has enabled end-to-end path protection over tunnel T1 and B has T= I-LFA enabled, and the detection timers are configured as described in your = previous email. If the BC link goes down, B will immediately start rerouting= the traffic via A (in FRR fashion) creating a loop b/w A and B. =20 A solution would be to make the A-B link ineligible for TI-LFA backup compu= tation at B. However, managing this network-wide could become operational ex= pensive. Hence, deploying one of end-to-end path protection or local protect= ion with sufficiently short detection timers keeps things simple, IMHO. =20 Regards, Muthu =20 On Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtein wrote: =20 =20 Regards, Sasha =20 Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com =20 From: Alexander Vainshtein=20 Sent: Tuesday, May 16, 2017 11:28 AM To: 'Stefano Previdi (sprevidi)' Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell = Nakash ; Michael Gorokhovsky ; Sidd Aanand ; Ron Sdayoor ; Rotem Cohen Subject: RE: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases =20 Stefano, Lots of thanks for a prompt response. =20 A couple of short comments if you do not mind: =20 Using 2119 language in a "use cases" document:=20 1. Going back to the source I see that =E2=80=9CMUST NOT=E2=80=A6 mean that the d= efinition is an absolute prohibition of the specification=E2=80=9D 2. I agree that the use case document defines which scenarios should = be addressed, but I do not see how it can impose an absolute prohibition on = a certain scenario.=20 =20 Little sense link protection has in the case of path protection: 1. This was definitely correct for traditional traffic engineering be= cause the =E2=80=9Cshortest traffic paths=E2=80=9D (e.g., LDL PSPs) could be easily diff= erentiated from the =E2=80=9Cengineered traffic paths=E2=80=9D.=20 2. In addition, traditional local protection (e.g., MPLS FRR using RS= VP-TE) could deal with link and node failures regardless of whether the fail= ed link or node appeared in the ERO of the protected path. 3. IMHO and FWIW, with SR the situation is quite different: o The shortest traffic paths not only coexist with engineered traffic pat= hs: the latter are in many cases =E2=80=9Ctunneled=E2=80=9D within the former. o Path protection cannot be applied to shortest traffic paths so they mus= t rely on local protection o Local protection in the case of failure of a node or link that appears = in the ERO of an engineered SR path is highly non-trivial at best, so path p= rotection for the engineered LSPs looks like a preferred solution to me. I fully agree with you that the operators deploying SR should provide feedb= ack on this point based on actual operational experience.=20 Meanwhile I doubt that a priori declaring some use cases as absolutely proh= ibited is the right thing to do. =20 My 2c, Sasha =20 Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com =20 =20 -----Original Message----- From: Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]=20 Sent: Monday, May 15, 2017 11:12 AM To: Alexander Vainshtein Cc: draft-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell = Nakash ; Michael Gorokhovsky ; Sidd Aanand ; Ron Sdayoor ; Rotem Cohen Subject: Re: [spring] A belated comment on end-to-end path protection in dr= aft-ietf-spring-resiliency-use-cases =20 =20 > On May 11, 2017, at 12:04 PM, Alexander Vainshtein wrote: >=20 > Hi all, > I have a belated (but hopefully late is still better than never) comment = on path protection as defined in Section 2 of the draft. > =20 > This second para in this section says: > A first protection strategy consists in excluding any local repair >=20 > but instead use end-to-end path protection where each SPRING path=20 > is >=20 > protected by a second disjoint SPRING path. In this case local >=20 > protection MUST NOT be used. >=20 > First of all, I do not think that RFC 2119 language should be used in Inf= ormational documents, especially in the documents that describe use cases. =20 =20 this document is also a requirements document for the resiliency use-case. = RFC2119 terminology is perfectly usable and even more, it adds clarity on wh= at the solution is expected to provide. =20 =20 > In addition, I specifically disagree with the quoted statement above, bec= ause, from my POV: > =C2=B7 Local repair and end-to-end path protection can be combined fo= r the same path > =C2=B7 Such a combination may be beneficial for the operators. =20 =20 are you talking by experience or is it just something that came into your m= ind ? I=E2=80=99d like to hear from operators using a combination of path and link= protection. =20 This document has been deeply reviewed also by operators and it has been al= ways obvious the little sense link protection has in case of path protection= . =20 =20 > One possible way to combine the two is described below: > =20 > 1. A pair of SR paths is set up between the given two nodes =E2=80=93 lat= er referred to as source and destination - in the network. These paths are = =E2=80=9CSR-disjoint=E2=80=9D in the sense that their =E2=80=9Cexplicit routes=E2=80=9D do not have= any common elements, be they nodes or adjacencies, with exclusion of the fi= nal destination > 2. Local repair for these paths is enabled in the network. It is tr= iggered by locally observed events (link failures etc.), applied by the node= s adjacent to the failure and guarantees that, in the case of a link or node= failure that is not specified in the explicit route, traffic along the affe= cted path would be restored within milliseconds > 3. End-to-end liveness monitoring is enabled for the two SR paths, = and detects end-to-end failures of these paths within milliseconds where= Y >> X. In other words, end-to-end liveness monitoring for these paths will= ignore any failures that local repair can fix, but will detect failures tha= t cannot be locally repaired (e.g., failures of nodes or links that have bee= n specified in the explicit route of one of the paths > 4. End-to-end liveness monitoring triggers end-to-end path protecti= on to be applied by the source node in the following way: > a. If it recognizes both paths as alive, one of them will carry the= customer traffic, while the other one will be idle. The rules for selecting= the active path in this scenario may vary > b. If end-to-end failure of one of these paths is detected while the= other one remains alive, traffic will be carried across the live path > c. If end-to-end failure of both paths is detected (e.g., if the fi= nal destination node fails, or if the network is partitioned), this is recog= nized as an unrecoverable failure. > =20 > From my POV the combination of local repair and end-to-end protection for= SR paths is one of a few possibilities to protect such paths against failur= es of nodes and/or links that have been specified in their explicit routes. = (Another option has been described in Node Protection for SR-TE Paths, but t= his draft has expired). > =20 > Do I miss something substantial? =20 =20 to my view you created a use-case that doesn=E2=80=99t bring much to the picture = but I=E2=80=99d let operators to comment. =20 s. =20 =20 > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@ecitele.com > =20 >=20 > ______________________________________________________________________ > _____ >=20 > This e-mail message is intended for the recipient only and contains=20 > information which is CONFIDENTIAL and which may be proprietary to ECI=20 > Telecom. If you have received this transmission in error, please=20 > inform us by e-mail, phone or fax, and then delete the original and all c= opies thereof. > ______________________________________________________________________ > _____ _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring =20 ___________________________________________________________________________ This e-mail message is intended for the recipient only and contains informa= tion which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this=20 transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original=20 and all copies thereof. ___________________________________________________________________________ _______________________________________________ spring mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring =20 ___________________________________________________________________________ This e-mail message is intended for the recipient only and contains informa= tion which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this=20 transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original=20 and all copies thereof. ___________________________________________________________________________ =20 ___________________________________________________________________________ This e-mail message is intended for the recipient only and contains informa= tion which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this=20 transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original=20 and all copies thereof. ___________________________________________________________________________ =20 ___________________________________________________________________________ This e-mail message is intended for the recipient only and contains informa= tion which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei= ved this=20 transmission in error, please inform us by e-mail, phone or fax, and then d= elete the original=20 and all copies thereof. ___________________________________________________________________________ _______________________________________________ spring mailing list spring@= ietf.org https://www.ietf.org/mailman/listinfo/spring=20 --B_3577773466_1291860587 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

resending with reduced number of recipients.

 

Cheers,<= /p>

Jeff

 

Sasha,

 

Don’t forget – RSVP-TE FRR has explicit signaling and state as= sociated with it, as well as well defined state transitions, SR on contrary = doesn’t.

Changes in topology = (link/node down events) are not communicated back to the head-end directly b= ut rather flooded thru a routing protocol (for sake of this discussion lets = ignore the possibility of running fast failure detection over SR tunnels).

Trying to derive operation state at P= LR based on transitional changes in a routing protocol is a rather complicat= ed task.

 

Cheers,

Jeff

 

 

From: spring <spring-bounces@ietf.org> on behalf of Alexan= der Vainshtein <Alexander.Vainshtein@ecitele.com>
Date: Tues= day, May 16, 2017 at 09:23
To: Muthu Arul Mozhi Perumal <muthu.= arul@gmail.com>
Cc: "spring@ietf.org" <spring@ietf= .org>, Shell Nakash <Shell.Nakash@ecitele.com>, Michael Gorokhovsky= <Michael.Gorokhovsky@ecitele.com>, "draft-ietf-spring-resiliency= -use-cases@ietf.org" <draft-ietf-spring-resiliency-use-cases@ietf.or= g>, Sidd Aanand <Sidd.Aanand@ecitele.com>, "Stefano Previdi (s= previdi)" <sprevidi@cisco.com>, Ron Sdayoor <Ron.Sdayoor@ecite= le.com>, Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject: R= e: [spring] A belated comment on end-to-end path protection in draft-ietf-sp= ring-resiliency-use-cases

 

Muthu,

Ag= ain lots of thanks for a prompt response.

 

We seem to agree on the following points:

=C2=B7 &nbs= p;       In SR some failur= es cannot be handled by local protection (actually, there is an expired draf= t that defines how this could be done, but it introduces serious complexity)=

=C2=B7         Combining local protection with end-to-end path protection is pos= sible. In particular, such a combination speeds up handling of failures that= that can be handled locally while also handling failures that could not be = addressed by local protection.

 

Whet= her combining both forms of protection carries with it some new problems or = not is a different story.

 

Regards,<= /span>

Sasha

 

Office: +972-39266302

Cell:      +972-54926630= 2

Email:   = Alexander.Vainshtein@ecitele.com

 

From:<= /b> Muthu Arul Mozhi Peru= mal [mailto:muthu.arul@gmail.com]
Sent: Tuesday, May 16, 2017 7:1= 1 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com= >
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; sp= ring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokh= ovsky <Michael.Gorokhovsky@ecitele.com>; draft-ietf-spring-resiliency-= use-cases@ietf.org; Sidd Aanand <Sidd.Aanand@ecitele.com>; Ron Sdayoor= <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>= ;
Subject: Re: [spring] A belated comment on end-to-end path prote= ction in draft-ietf-spring-resiliency-use-cases

 

Sasha,=

 

On = Tue, May 16, 2017 at 4:29 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.co= m> wrote:

Muthu,

An additional clarification:

=C2= =B7    =      If the link BC were OK, B could pop B from the stack an= d send packets to C with just D in the stack

=C2=B7     = ;    When the link BC fails, B will leave the stack as (CD) IMHO = – it would be  just trying to bypass the failed link BC= .

=C2=B7         If the failure of BC as= perceived by B was cause by the failure of node B, such a failure could not= be recovered by local protection. This is exactly the scenario where = local protection for shortest SR path comprising an SR-TE path should be aug= mented by end-to-end path protection.

=E2=80=8BIf node B fails, the e2e path monitoring at &n= bsp;node A would anyway detect the failure and switch the traffic over an al= ternate disjoint path...=E2=80=8B

=

 

Regarding combination of = local protection with end-to-end protection for RSVP-TE – AFAIK this w= as never used because it would not provide any added value.

In SR this is not so because local protection is usually fast= er (and scales better) than end-to-end protection, but, as opposed to RSVP-T= E, there are failures that local protection cannot fix.

=  

=E2=80=8BAgree, there are failures in SR-TE = that local protection cannot fix as desired, so it calls for e2e path protec= tion. However, enabling them together is not always the best approach since = it can introduce other problems to solve.

&= nbsp;

Regards,

<= div>

Muthu

 

 

Regards,

Sasha

 

Office: +972-39266302

Cell:&nbs= p;     = +972-549266302

Email:   Alexander.Vainshte= in@ecitele.com

 

From: Alexander Vainshtein
Sent: Tuesday, May 16, 2017 1:42 PM<= br>To: 'Muthu Arul Mozhi Perumal' <muthu.arul@gmail.com>
Cc: Stefano Pr= evidi (sprevidi) <spr= evidi@cisco.com>; sp= ring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhovsky <= Michael.Gor= okhovsky@ecitele.com>; draft-ietf-spring-resiliency-use-cases@ie= tf.org; Sidd Aanand <Sidd.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rote= m Cohen <Rotem.C= ohen@ecitele.com>
Subject: RE: [spring] A belated comment o= n end-to-end path protection in draft-ietf-spring-resiliency-use-cases

 

Muthu,

Again lots of thanks for a prompt res= ponse. I still do not think a loop would really form because:

=C2=B7  =        A sends packet to its local next hop for B = with the stack (B, C, D)

=C2=B7         = B re= ceives this packet with the stack (C, D), but the link C has failed. So B se= nds to its next hop for it back to A with stack (C,D)

=C2=B7  &= nbsp;      A now sends the packet to its next hop for C= with the same stack.

 =

Regards,

Sasha<= /p>

 

Office: +972-39266302

Cell:      +972-549266302

Email:  = ; Alexande= r.Vainshtein@ecitele.com

 

From:= Muthu Arul Mozhi Perumal [mailto:muthu.arul@gmail.com]
Sent: Tuesday, May 16, 2017= 1:25 PM


To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com&= gt;
Cc: Stefano Previdi (sprevidi) <sprevidi@cisco.com>; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com&g= t;; Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; draft-ietf-sp= ring-resiliency-use-cases@ietf.org; Sidd Aanand <Sidd.Aanand@ecitele.com>; Ron Sd= ayoor <Ron.Sdayo= or@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject: Re: = [spring] A belated comment on end-to-end path protection in draft-ietf-sprin= g-resiliency-use-cases

 

On Tue, May 16, 2017 at 3:27 PM, Alexander Vainshtein <Alexander.Vainshte= in@ecitele.com> wrote:

=

Muthu,

Lots of thanks for a= prompt response.

 

=

I do not think that the loop you have described would actually appe= ar in the scenario you’ve described.

&nb= sp;

To the best of my understanding of TI-LFA,= B would send the traffic back to A complete with an explicit route that = says B=C3=A0 A=C3=A0 C=C3=A0D, and no loop would be formed. &nbs= p;

&n= bsp;

Not necessarily. B was asked to send the traffic to C and knows t= hat if it sends the traffic to A, then A will send it to C over the shortest= path (i.e from B's perspective only the labeled next-hop changes). Unfortun= ately, A has an explicit route pointing back to B (over the SR-TE tunnel T1)= that B isn't aware of. If B does strict explicit route for everything, then= B can run out of its MSD.. 

 

=E2=80=8B

 

Similar “loops” = can happen also in MPLS FRR with RSVP-TE when the PLR sends some traffic bac= k  - but it sends it with the suitable label stack of the bypass tunnel= so that eventually it reaches the MP.

 

=E2=80=8BAre there existing deploym= ents where both e2e path protection and local protection are used together w= ith RSVP-TE?

 

Regards,

Muthu=

 

 

Regards,

Sasha

 

Office: +97= 2-39266302

Cell:    &n= bsp; +972-549266302

Email:   Alexander.Vainshtein@ecitele.com

 

<= b>From: Muthu Arul Mozhi Perumal [mailt= o:muthu.arul@gmail.com= ]
Sent: Tuesday, May 16, 2017 12:34 PM
To: Alexande= r Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: Stefano Previd= i (sprevidi) <sprevid= i@cisco.com>; spring= @ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael Gorokhovsky <Michael.Gorokho= vsky@ecitele.com>; draft-ietf-spring-resiliency-use-cases@ietf.o= rg; Sidd Aanand <Sidd.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Co= hen <Rotem.Cohen= @ecitele.com>


= Subject: Re: [spring] A belated comment on end-to-end path protection= in draft-ietf-spring-resiliency-use-cases

 

Using end-to-end path protection = together with local protection can result in traffic loops. Consider the fol= l. topology:

 =

B-----C   

|    / \

|   /   \ 

|  /     \<= o:p>

| /       \D----+ 

<= div>

A/   &n= bsp;          Z (CE)

 \  =       F----+ 

  \     &n= bsp; /

   \     /

<= /div>

 =   \   / 

     \E/=

 

- All links are of = equal cost.

- A, D and F are BGP peers.

- Z = is a dual-homed CE.

&nbs= p;

A resolves its BGP next-hop D over the SR-TE tunnel T1.

T1: A->B, B->C, C->D (loosely routed)

=

 

Suppose A has enabled end-to-= end path protection over tunnel T1 and B has TI-LFA enabled, and the detecti= on timers are configured as described in your previous email. If the BC link= goes down, B will immediately start rerouting the traffic via A (in FRR fas= hion) creating a loop b/w A and B.

 

A solution would be to make the A-B link ineligib= le for TI-LFA backup computation at B. However, managing this network-wide c= ould become operational expensive. Hence, deploying one of end-to-end path p= rotection or local protection with sufficiently short detection timers keeps= things simple, IMHO.

&n= bsp;

Regards,

<= span style=3D'font-family:"Courier New"'>Muthu

 

On = Tue, May 16, 2017 at 1:59 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.co= m> wrote:

 

 

Regards,

= Sasha

<= span style=3D'color:#44546A'> 

<= span style=3D'color:#44546A'>Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@ecitele= .com

 

From:<= /b> Alexander Vainshtein
Sent: Tuesday, May 16, 2017 11:28 AM
= To: 'Stefano Previdi (sprevidi)' <sprevidi@cisco.com>
Cc: draft-ietf-= spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; Michael = Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aanand@ecitele.com>; = Ron Sdayoor <Ron= .Sdayoor@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject: RE: [spring] A belated comment on end-to-end path protection in draft-ietf= -spring-resiliency-use-cases

&= nbsp;

Stefa= no,

Lots of= thanks for a prompt response.

 

A couple of short comments if you do not mind:

 

Using 2119 language in= a "use cases" document:

1.  = ;     Going back to the source I see that “= MUST NOT… mean that the definition is an absolute prohibition of the s= pecification”

2.      = ; I agree that the use case document defines which scenarios should b= e addressed, but I do not see how it can impose an absolute prohibition on a= certain scenario.

 

Little sense link protection has in the case of path protection:

1.<= span style=3D'font-size:7.0pt'>       Thi= s was definitely correct for traditional traffic engineering because the = 220;shortest traffic paths” (e.g., LDL PSPs) could be easily different= iated from the “engineered traffic paths”.

2.       In addition, traditional local = protection (e.g., MPLS FRR using RSVP-TE) could deal with link and node fail= ures regardless of whether the failed link or node appeared in the ERO of th= e protected path.

3.       = IMHO and FWIW, with SR  the situation is quite different:

o   The shortest traffic paths not only coexist with engineered traffic pat= hs: the latter are in many cases “tunneled” within the former.

o &nbs= p; Path protection cannot be applied to shortest traffic paths so the= y must rely on local protection

o   Local protection in the case of f= ailure of a node or link that appears in the ERO of an engineered SR path is= highly non-trivial at best, so path protection for the engineered LSPs look= s like a preferred solution to me.

I fully agree with you that the operators deploying= SR should provide feedback on this point based on actual operational experi= ence.

Mea= nwhile I doubt that a priori declaring some use cases as absolutely p= rohibited is the right thing to do.

 

My 2c,

Sasha

 

Office: +972-3926630= 2

Cell:=       +972-549266302

Email:   Alexander.Vainshtein@ecitele.com

 

 

-----Original Message-----
From: S= tefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]
Sent: Monday, May 15, 2017 11:12 AMTo: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: draf= t-ietf-spring-resliency-use-cases@ietf.org; spring@ietf.org; Shell Nakash <Shell.Nakash@ecitele.com>; M= ichael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; Sidd Aanand <Sidd.Aanand@ecitele.com>; Ron Sdayoor <Ron.Sdayoor@ecitele.com>; Rotem Cohen <Rotem.Cohen@ecitele.com>
Subject= : Re: [spring] A belated comment on end-to-end path protection in draft-ietf= -spring-resiliency-use-cases

 

 

> On May 11, 2017, at 12:04 PM, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<= /a>> wrote:

>

> Hi all,

> I have a belated (but hopefully late is still better than ne= ver) comment on path protection as defined in Section 2 of the draft.

>  <= /o:p>

> This second= para in this section says:

>    A first protection strategy consists= in excluding any local repair

>

>    but instead use end-to-end path protec= tion where each SPRING path

> is

>

>    protected by a second disjoint SPRING path.=   In this case local

>

>    protection MUST NOT be used.

=

>

> First of all, I do not th= ink that RFC 2119 language should be used in Informational documents, especi= ally in the documents that describe use cases.

 

 

this document is also a requirements document fo= r the resiliency use-case. RFC2119 terminology is perfectly usable and even = more, it adds clarity on what the solution is expected to provide.

 

 

> In addition, I specific= ally disagree with the quoted statement above, because, from my POV:

> =C2=B7  = ;       Local repair and end-to-end path prote= ction can be combined for the same path

> =C2=B7      &nbs= p;  Such a combination may be beneficial for the operators.<= /p>

 

<= p class=3Dm6178413510676655620m-497793380002912491m947722130701357768m58944496= 29666138440msoplaintext style=3D'margin-left:1.0in'> 

are you talking by experience = or is it just something that came into your mind ? I’d like to hear fr= om operators using a combination of path and link protection.

=

 

This document has been deeply= reviewed also by operators and it has been always obvious the little sense = link protection has in case of path protection.

 

 

> One possible way to combine the two is des= cribed below:

> 

> 1.       A pair of SR paths is set up= between the given two nodes – later referred to as source and destina= tion -  in the network. These paths are “SR-disjoint” in th= e sense that their “explicit routes”  do not have any commo= n elements, be they nodes or adjacencies, with exclusion of the final destin= ation

> = 2.       Local repair for these paths is enabl= ed in the network. It is triggered by locally observed events (link failures= etc.), applied by the nodes adjacent to the failure and guarantees that, in= the case of a link or node failure that is not specified in the explicit ro= ute, traffic along the affected path would be restored within <X> mill= iseconds

&g= t; 3.       End-to-end liveness monitoring is = enabled for the two SR paths, and detects end-to-end failures of these paths= within <Y> milliseconds where Y >> X. In other words, end-to-en= d liveness monitoring for these paths will ignore any failures that local re= pair can fix, but will detect failures that cannot be locally repaired (e.g.= , failures of nodes or links that have been specified in the explicit route = of one of the paths

> 4.       End-to-end liveness mon= itoring triggers end-to-end path protection to be applied by the source node= in the following way:

> a.       If it recognizes bot= h paths as alive, one of them will carry the customer traffic, while the oth= er one will be idle. The rules for selecting the active path in this scenari= o may vary

= > b.      If end-to-end failure of one of these = paths is detected while the other one remains alive, traffic will be carried= across the live path

> c.       If end-to-end failure= of both paths is detected (e.g., if the final destination node fails, or if= the network is partitioned), this is recognized as an unrecoverable failure= .

> = ;

> Fro= m my POV the combination of local repair and end-to-end protection for SR pa= ths is one of a few possibilities to protect such paths against failures of = nodes and/or links that have been specified in their explicit routes. (Anoth= er option has been described in Node Protection for SR-TE Paths, but this dr= aft has expired).

> 

> Do I miss something substantial?

 

 

to my view you created a use-case that doesn̵= 7;t bring much to the picture but I’d let operators to comment.

 =

s.

 

 

> 

> Regards,

> Sasha

> 

> Office: +972-39266302

> Cell:     = +972-549266302

> Email: &= nbsp; Alexander.Vainshtein@ecitele= .com

> 

>

> ______________________________________________________________________=

> _____=

> =

> This e-mai= l message is intended for the recipient only and contains

> information which is CO= NFIDENTIAL and which may be proprietary to ECI

> Telecom. If you have received this= transmission in error, please

> inform us by e-mail, phone or fax, and then delete= the original and all copies thereof.

> ____________________________________________= __________________________

> _____ _____________________________________= __________

= > spring mailing list

> spring@ietf.org<= /o:p>

> https://www.ietf.org/mailman/listinfo/sp= ring

 


____________________= _______________________________________________________

This e-mail m= essage is intended for the recipient only and contains information which is =
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have re= ceived this
transmission in error, please inform us by e-mail, phone or = fax, and then delete the original
and all copies thereof.
___________= ________________________________________________________________<= /p>


_______________________________________________spring mailing list
sp= ring@ietf.org
https://www.ietf.org/mailman/listinfo/spring<= /p>

 

<= /div>


_________________________= __________________________________________________

This e-mail messag= e is intended for the recipient only and contains information which is
C= ONFIDENTIAL and which may be proprietary to ECI Telecom. If you have receive= d this
transmission in error, please inform us by e-mail, phone or fax, = and then delete the original
and all copies thereof.
________________= ___________________________________________________________

 

=


_______________________________________________________________= ____________

This e-mail message is intended for the recipient only a= nd contains information which is
CONFIDENTIAL and which may be proprieta= ry to ECI Telecom. If you have received this
transmission in error, plea= se inform us by e-mail, phone or fax, and then delete the original
and a= ll copies thereof.
______________________________________________________= _____________________

 

<= p class=3DMsoNormal style=3D'margin-left:1.0in'>
____________________________= _______________________________________________

This e-mail message i= s intended for the recipient only and contains information which is
CONF= IDENTIAL and which may be proprietary to ECI Telecom. If you have received t= his
transmission in error, please inform us by e-mail, phone or fax, and= then delete the original
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________________= _______________________________ spring mailing list spring@ietf.org https://= www.ietf.org/mailman/listinfo/spring

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"draft-bardhan-spring-poi-sr-oam@ietf.org" , "spring@ietf.org" Thread-Topic: [spring] Requirements towards OAM in Segment Routing network Thread-Index: AQHSzh2hYuTATHtv/ESR42cBtB5wGqH46HwA Date: Wed, 17 May 2017 15:18:26 +0000 Message-ID: <085486A4-470F-4769-A22D-D8785E345F51@cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.150.72.101] Content-Type: multipart/alternative; boundary="_000_085486A4470F4769A22DD8785E345F51ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Requirements towards OAM in Segment Routing network X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Thu, 18 May 2017 07:44:47 +0000 From: Chao Fu To: "spring@ietf.org" Thread-Topic: One question on E-flag of ABR/ASBR in OSPF SR extension Thread-Index: AdLPqkMsp7Qw/GF8TGW2zt4btSR+jQ== Date: Thu, 18 May 2017 07:44:47 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=ericsson.com; x-originating-ip: [106.38.5.68] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; VI1PR07MB1070; 7:cOpQklFfIN7iU6z9PBSTDgeFsGNNjTOg6BxBGIiFZ4WGpTeTnoFoYauYsciHu0xdlFmUmnAluSJBZOooZQmzhoZuLrPLOO9HIBOJGyJaKntIRwIkeViaEn1awEA7uXstwMhhMQWvM8bSdGF6mztKikfdRpQUQzk7p+ZU1koj17yTWR0I6RyydxzcN3ZGG5oVltZU6VhK1aKhIECWA4XbId6joQNdg4d0HvrqprhHYYRvdiFRziX9HOs4l1dwrrQaPwJDI9U+1wxvI1HvvtqQecIrwijGLFC/bpshqNlCgF3/YIr76Njn3VioHHXlrcmCSCWbJiTdHccDpidPyRSZ3w== x-ms-traffictypediagnostic: VI1PR07MB1070: x-ms-office365-filtering-correlation-id: d07971a8-cc3b-4e87-cfc0-08d49dc1c1f8 x-microsoft-antispam: UriScan:; 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DIR:OUT; SFP:1101; SCL:1; SRVR:VI1PR07MB1070; H:VI1PR07MB1071.eurprd07.prod.outlook.com; FPR:; SPF:None; MLV:ovrnspm; PTR:InfoNoRecords; LANG:en; spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_VI1PR07MB1071503225586B964C69096191E40VI1PR07MB1071eurp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 May 2017 07:44:47.2048 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR07MB1070 X-OriginatorOrg: ericsson.com X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprHKsWRmVeSWpSXmKPExsUyM2K7qO7nANlIg82TtS2OX/jN6MDosWTJ T6YAxigum5TUnMyy1CJ9uwSujIYZMxkLDmtVTH/p2cB4S6WLkYNDQsBE4stl9y5GLg4hgSOM EvO+HWCHcE4wSuxc+4UNxGER6GWWuDT7H1RmGpPEwjNvGCGcY4wSe24sYAOZxSagIrFwoSGI KSKgLvHsaHgXIyeHsICDxL8bv5hAbBEBV4nWzz+gbD2Jfx3rwWwWAVWJrS/vsoHYvAIxErNO f2UBsRkFxCS+n1oDVsMsIC5x68l8MFtCQEBiyZ7zzBC2qMTLx/9YQc5hFOhmlPgw7xpUkbzE qVsH2SFsWYlL87vBbpYQ6GGWOPBhPStEQkuiZc9vqEm+EpP7b0M110ms2fEcqjlbonHXLEYI 20qiY+JxVohBh1glJvVPg0rISKyeuQ4q8ZFVYt3Zr6wQ/0tJ3L3SyQhhy0i8uLOXFeKffInJ n6+wTGBUn4XkvVlIUrPAwSEocXLmExaIuI7Egt2f2CBsbYllC18zw9hnDjxmQhZfwMi+ilG0 OLU4KTfdyFgvtSgzubg4P08vL7VkEyMw1Rzc8lt1B+PlN46HGAU4GJV4eHPMZSOFWBPLiitz DzFKcDArifBOtwAK8aYkVlalFuXHF5XmpBYfYpTmYFES53XcdyFCSCA9sSQ1OzW1ILUIJsvE wSnVwOhwfbnTj9qmG/dE7VWt4hp/Tzjhlby+8+3R9T/39r51yp24Symn/N7ifNZ5iS7Wr00l 62oTn/S/vHr6cFfbPIP8Sb6OzTcZNh9P4uA1NnFe7+f0KTFXfurN6Tl85cH6SjeF7+x7zV7w 9Yfx14iaU/Z7HsR43TKzvi+nJ3pZfkfeqQfTw9wXeSixFGckGmoxFxUnAgC87ATrMQMAAA== Archived-At: Subject: [spring] One question on E-flag of ABR/ASBR in OSPF SR extension X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 May 2017 07:50:33 -0000 --_000_VI1PR07MB1071503225586B964C69096191E40VI1PR07MB1071eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Should we clarify how to set E-flag for ABR/ASBR in OSPF SR extension? In https://www.ietf.org/id/draft-ietf-ospf-segment-routing-extensions-14.tx= t, the draft describes how to set NP-flag on ABR and ASBR (Section 5 [Page = 14]): The NP-Flag (No-PHP) MUST be set for Prefix-SIDs allocated to inter- area prefixes that are originated by the ABR based on intra-area or inter-area reachability between areas. When the inter-area prefix is generated based on a prefix which is directly attached to the ABR, the NP-Flag SHOULD NOT be set. The NP-Flag (No-PHP) MUST be be set for Prefix-SIDs allocated to redistributed prefixes, unless the redistributed prefix is directly attached to the ASBR, in which case the NP-flag SHOULD NOT be set. However, the E-flag (Explicit-Null Flag) is not described. Should we clarif= y it also? I think E-flag SHOULD NOT be set if the prefix is not directly a= ttached to the ABR or ASBR, and if necessary, it SHOULD be set if the prefi= x is directly attached to the ABR or ASBR. Regards, Chao Fu --_000_VI1PR07MB1071503225586B964C69096191E40VI1PR07MB1071eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

Should we clarify how to set E-flag for ABR/ASBR in = OSPF SR extension?

 

In https://www.ietf.org/id/draft-ietf-ospf-segment-routing-extensions-14.txt, the draft describes how to set NP-flag on ABR and ASBR (Section 5 [Page= 14]):

 

   The NP-Flag (No-PHP) MUST be set for Pr= efix-SIDs allocated to inter-

   area prefixes that are originated by th= e ABR based on intra-area or

   inter-area reachability between areas.&= nbsp; When the inter-area prefix is

   generated based on a prefix which is di= rectly attached to the ABR,

   the NP-Flag SHOULD NOT be set.

 

   The NP-Flag (No-PHP) MUST be be set for= Prefix-SIDs allocated to

   redistributed prefixes, unless the redi= stributed prefix is directly

   attached to the ASBR, in which case the= NP-flag SHOULD NOT be set.

 

However, the E-flag (Explicit-Null Flag) is not desc= ribed. Should we clarify it also? I think E-flag SHOULD NOT be set if the p= refix is not directly attached to the ABR or ASBR, and if necessary, it SHO= ULD be set if the prefix is directly attached to the ABR or ASBR.

 

Regards,=

Chao Fu<= /span>

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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 May 2017 08:28:13 -0000 --_000_VI1PR07MB1071C2922D204E4811066A9A91E40VI1PR07MB1071eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, There is one typo in Section 8.4.2 of https://www.ietf.org/id/draft-ietf-o= spf-segment-routing-extensions-14.txt, Section 8.4.2 says:. When Segment Routing is used, each router on the broadcast, NBMSA, or = ----------- Should be NBMA hybrid network MAY advertise the Adj-SID for its adjacency to the DR using the Adj-SID Sub-TLV as described in Section 7.1. Regards, Chao Fu --_000_VI1PR07MB1071C2922D204E4811066A9A91E40VI1PR07MB1071eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

There is one typo in Section 8.4.2 of  https://www.ietf.org/id/dr= aft-ietf-ospf-segment-routing-extensions-14.txt,

 

Section 8.4.2 says:. 

   When Segment Routing is used, each= router on the broadcast, NBMSA, or

        &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;      -----------  Should be NBMA

   hybrid network MAY advertise the Adj-SI= D for its adjacency to the DR

   using the Adj-SID Sub-TLV as described = in Section 7.1.

 

Regards,=

Chao Fu<= /span>

--_000_VI1PR07MB1071C2922D204E4811066A9A91E40VI1PR07MB1071eurp_-- From nobody Thu May 18 01:59:37 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 403F4129503 for ; Thu, 18 May 2017 01:59:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0tsimVDv2U7x for ; Thu, 18 May 2017 01:59:35 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 673CA129487 for ; Thu, 18 May 2017 01:54:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1586; q=dns/txt; s=iport; t=1495097656; x=1496307256; h=message-id:date:from:mime-version:to:subject:references: in-reply-to:content-transfer-encoding; bh=f5ACgoVlR0Xk2szokEBL8iKkoHQAdY9Yw581K4ufuuA=; b=Uh0Uf4suGpy2DoMG1Fup1XZvC0cSrP6EaYWRWSWZgJ+aXP+yhux8hot7 BsyWhlkuGJt+Vmqvr7x3Aju9F+T/6cvU6qRU6ZmMzPFr9Dg8+/jW3S2Sp jUHD8XDYjt7ERp5ysY1C96v/4DtLt0nhPpyal0z1S+K6PnpkjuFDYt0P0 o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CMAAD0Xx1Z/xbLJq1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBhDeBDI4Fc5B2lXaCDyENhSxKAoYnGAECAQEBAQEBAWsohRgBAQE?= =?us-ascii?q?BAgEBATY2ChELGAkWDwkDAgECARUwBgEMBgIBAYoXCA6vfBKKfgEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBARsFhl+BXoMbilUBBJ4TkxuLBIZqlEYfOIEKLyAIGRVGhng+NgG?= =?us-ascii?q?IMQEBAQ?= X-IronPort-AV: E=Sophos;i="5.38,358,1491264000"; d="scan'208";a="694498656" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 May 2017 08:54:14 +0000 Received: from [10.147.24.61] ([10.147.24.61]) by aer-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id v4I8sDmv002002; Thu, 18 May 2017 08:54:14 GMT Message-ID: <591D6136.2070208@cisco.com> Date: Thu, 18 May 2017 10:54:14 +0200 From: Peter Psenak User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Chao Fu , "spring@ietf.org" References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [spring] One question on E-flag of ABR/ASBR in OSPF SR extension X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 May 2017 08:59:36 -0000 Hi Chao, On 18/05/17 09:44 , Chao Fu wrote: > Hi, > > Should we clarify how to set E-flag for ABR/ASBR in OSPF SR extension? > > In > https://www.ietf.org/id/draft-ietf-ospf-segment-routing-extensions-14.txt, > the draft describes how to set NP-flag on ABR and ASBR (Section 5 [Page > 14]): > > The NP-Flag (No-PHP) MUST be set for Prefix-SIDs allocated to inter- > > area prefixes that are originated by the ABR based on intra-area or > > inter-area reachability between areas. When the inter-area prefix is > > generated based on a prefix which is directly attached to the ABR, > > the NP-Flag SHOULD NOT be set. > > The NP-Flag (No-PHP) MUST be be set for Prefix-SIDs allocated to > > redistributed prefixes, unless the redistributed prefix is directly > > attached to the ASBR, in which case the NP-flag SHOULD NOT be set. > > However, the E-flag (Explicit-Null Flag) is not described. Should we > clarify it also? I think E-flag SHOULD NOT be set if the prefix is not > directly attached to the ABR or ASBR, and if necessary, it SHOULD be set > if the prefix is directly attached to the ABR or ASBR. The existing draft says: "If the NP-flag is not set then the received E-flag is ignored." Given that the draft clearly states when the NP-flag is set on ABR/ASBR above statement should be sufficient. thanks, Peter > > Regards, > > Chao Fu > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > From nobody Thu May 18 02:00:54 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B00D2129B89 for ; Thu, 18 May 2017 02:00:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XYbmWSdVEWga for ; Thu, 18 May 2017 02:00:51 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9FA2A129B5D for ; Thu, 18 May 2017 01:55:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=795; q=dns/txt; s=iport; t=1495097717; x=1496307317; h=message-id:date:from:mime-version:to:subject:references: in-reply-to:content-transfer-encoding; bh=WmVjG1kWoHt6z0qveF/N3mIDx9XB6qyiaxF/8foUURg=; b=bB6PKY+9BfbXejAfXVRRxQjjjo+HiIvtKNbyKBWgbxXbm+7UsVV/TYHj 58QQSP3koa+MqaeQL0h8eLJpn0wQQ1q3lYySLe/JscNtobxQlDjHTkC3i ObAS8d4ZN6jCltE2jTgSWFRru1JRUe4jVu5Dd2q/Ote5FgUvJI0qaaA6r 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CMAABbYB1Z/xbLJq1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBhDeBDI4Fc5B2lXaCDyENhSxKAoYoGAECAQEBAQEBAWsohRkBAQE?= =?us-ascii?q?DAQE2NgoRCxgJFg8JAwIBAgEVMAYBDAYCAQGKHw6vfhKKfgEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBARsFhl+BXoMbilUBBIlGlE2TG4FsiRiGapRGHziBCi8gCBkVRoR3HIF?= =?us-ascii?q?lPjYBiDEBAQE?= X-IronPort-AV: E=Sophos;i="5.38,358,1491264000"; d="scan'208";a="652955274" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 May 2017 08:55:15 +0000 Received: from [10.147.24.61] ([10.147.24.61]) by aer-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id v4I8tFwP021125; Thu, 18 May 2017 08:55:15 GMT Message-ID: <591D6174.3090701@cisco.com> Date: Thu, 18 May 2017 10:55:16 +0200 From: Peter Psenak User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Chao Fu , "spring@ietf.org" References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [spring] one typo in OSPF SR extension X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 May 2017 09:00:53 -0000 Hi Chao, thanks, will fix it. Peter On 18/05/17 10:21 , Chao Fu wrote: > Hi, > > There is one typo in Section 8.4.2 of > https://www.ietf.org/id/draft-ietf-ospf-segment-routing-extensions-14.txt, > > Section 8.4.2 says:. > > When Segment Routing is used, each router on the broadcast, NBMSA, or > > ----------- Should be NBMA > > hybrid network MAY advertise the Adj-SID for its adjacency to the DR > > using the Adj-SID Sub-TLV as described in Section 7.1. > > Regards, > > Chao Fu > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > From nobody Thu May 18 02:21:19 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F352212EB02 for ; Thu, 18 May 2017 02:21:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.22 X-Spam-Level: X-Spam-Status: No, score=-4.22 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 May 2017 09:21:18 -0000 Hi Peter, It's right if the NP-flag is not set then the received E-flag is ignored. B= ut, if the NP-flag is SET because the prefix is not directly attached to th= e ABR, E-flag will not be ignored and the upstream neighbor will replace th= e Prefix-SID with the Explicit-NULL label 0. I guess actually the packet sh= ould be forwarded with the original prefix-SID, and no need to pop the 0 la= bel and look up path again.=20 Regards, Chao Fu -----Original Message----- From: Peter Psenak [mailto:ppsenak@cisco.com]=20 Sent: Thursday, May 18, 2017 16:54 To: Chao Fu ; spring@ietf.org Subject: Re: [spring] One question on E-flag of ABR/ASBR in OSPF SR extensi= on Hi Chao, On 18/05/17 09:44 , Chao Fu wrote: > Hi, > > Should we clarify how to set E-flag for ABR/ASBR in OSPF SR extension? > > In > https://www.ietf.org/id/draft-ietf-ospf-segment-routing-extensions-14. > txt, the draft describes how to set NP-flag on ABR and ASBR (Section 5=20 > [Page > 14]): > > The NP-Flag (No-PHP) MUST be set for Prefix-SIDs allocated to=20 > inter- > > area prefixes that are originated by the ABR based on intra-area=20 > or > > inter-area reachability between areas. When the inter-area prefix=20 > is > > generated based on a prefix which is directly attached to the ABR, > > the NP-Flag SHOULD NOT be set. > > The NP-Flag (No-PHP) MUST be be set for Prefix-SIDs allocated to > > redistributed prefixes, unless the redistributed prefix is=20 > directly > > attached to the ASBR, in which case the NP-flag SHOULD NOT be set. > > However, the E-flag (Explicit-Null Flag) is not described. Should we=20 > clarify it also? I think E-flag SHOULD NOT be set if the prefix is not=20 > directly attached to the ABR or ASBR, and if necessary, it SHOULD be=20 > set if the prefix is directly attached to the ABR or ASBR. The existing draft says: "If the NP-flag is not set then the received E-flag is ignored." Given that the draft clearly states when the NP-flag is set on ABR/ASBR abo= ve statement should be sufficient. thanks, Peter > > Regards, > > Chao Fu > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > From nobody Thu May 18 02:52:30 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AEB99129AE5 for ; Thu, 18 May 2017 02:52:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wZzPRJTNIwvZ for ; Thu, 18 May 2017 02:52:27 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 30FFE12EAF4 for ; Thu, 18 May 2017 02:47:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2798; q=dns/txt; s=iport; t=1495100844; x=1496310444; h=message-id:date:from:mime-version:to:subject:references: in-reply-to:content-transfer-encoding; bh=7P654ScjTZrL5/Sjv8Z3yjq3oA7mkIvY1wRvlCsUjoo=; b=gupYNabLI8Dy72L0JjQHD/Ipk+BVZSXyIIQMNeSG0auwyFqp97lyLc63 T5nbvn+Gy32cq+KrMdhmqsGiGkY9YyXHydbyK9PtIzrZNmqdVAvBnLwdc 9uVmsjlvDO7whMBOhNtoaRyd4V+kN2I3L0Uq6kLL0J9YsdFaGYoYNoZ6Y o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CMAAAQbB1Z/xbLJq1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBhDeBDI4Fc5B4lXaCDyELhS5KAoYpGAECAQEBAQEBAWsohRgBAQE?= =?us-ascii?q?BAgEBATY2EAcECxEEAQEBCR4HDwIWHwkIBgEMBgIBAYoXCA6wGIp+AQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEBGAWGX4FegxuKVQEEnhOTG4sEhmqURh84gQovIAgZFUa?= =?us-ascii?q?EdxyBZT42iDIBAQE?= X-IronPort-AV: E=Sophos;i="5.38,358,1491264000"; d="scan'208";a="654776848" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 May 2017 09:47:22 +0000 Received: from [10.147.24.61] ([10.147.24.61]) by aer-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id v4I9lLc0000608; Thu, 18 May 2017 09:47:22 GMT Message-ID: <591D6DAA.20407@cisco.com> Date: Thu, 18 May 2017 11:47:22 +0200 From: Peter Psenak User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Chao Fu , "spring@ietf.org" References: <591D6136.2070208@cisco.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [spring] One question on E-flag of ABR/ASBR in OSPF SR extension X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 May 2017 09:52:29 -0000 Hi Chao, On 18/05/17 11:15 , Chao Fu wrote: > Hi Peter, > > It's right if the NP-flag is not set then the received E-flag is ignored. But, if the NP-flag is SET because the prefix is not directly attached to the ABR, E-flag will not be ignored why would an E-bit be set in such case? It's up to the originator of the SID to decide when to set the E-bit. If the ABR does not set the E-bit no PHP would be done and advertised SID will be preserved. Are you trying to add the text that would say that ABR MUST NOT set the E-bit either? I don't think it's necessary. thanks, Peter > and the upstream neighbor will replace the Prefix-SID with the Explicit-NULL label 0. I guess actually the packet should be forwarded with the original prefix-SID, and no need to pop the 0 label and look up path again. > > Regards, > Chao Fu > > > -----Original Message----- > From: Peter Psenak [mailto:ppsenak@cisco.com] > Sent: Thursday, May 18, 2017 16:54 > To: Chao Fu ; spring@ietf.org > Subject: Re: [spring] One question on E-flag of ABR/ASBR in OSPF SR extension > > Hi Chao, > > On 18/05/17 09:44 , Chao Fu wrote: >> Hi, >> >> Should we clarify how to set E-flag for ABR/ASBR in OSPF SR extension? >> >> In >> https://www.ietf.org/id/draft-ietf-ospf-segment-routing-extensions-14. >> txt, the draft describes how to set NP-flag on ABR and ASBR (Section 5 >> [Page >> 14]): >> >> The NP-Flag (No-PHP) MUST be set for Prefix-SIDs allocated to >> inter- >> >> area prefixes that are originated by the ABR based on intra-area >> or >> >> inter-area reachability between areas. When the inter-area prefix >> is >> >> generated based on a prefix which is directly attached to the ABR, >> >> the NP-Flag SHOULD NOT be set. >> >> The NP-Flag (No-PHP) MUST be be set for Prefix-SIDs allocated to >> >> redistributed prefixes, unless the redistributed prefix is >> directly >> >> attached to the ASBR, in which case the NP-flag SHOULD NOT be set. >> >> However, the E-flag (Explicit-Null Flag) is not described. Should we >> clarify it also? I think E-flag SHOULD NOT be set if the prefix is not >> directly attached to the ABR or ASBR, and if necessary, it SHOULD be >> set if the prefix is directly attached to the ABR or ASBR. > > The existing draft says: > > "If the NP-flag is not set then the received E-flag is ignored." > > Given that the draft clearly states when the NP-flag is set on ABR/ASBR above statement should be sufficient. > > thanks, > Peter > > >> >> Regards, >> >> Chao Fu >> >> >> >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring >> > > . > From nobody Fri May 19 01:10:41 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E688612EAA6 for ; Fri, 19 May 2017 01:10:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.192 X-Spam-Level: X-Spam-Status: No, score=-3.192 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, DKIM_SIGNED=0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-2.8, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_DKIM_INVALID=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 May 2017 08:10:39 -0000 Speaking as co-chair. I also believe that the WG should focus on producing meaningful material we can submit to IESG with confidence. In fact we have discussed with the authors of draft-ietf-spring-sr-oam-requirement and out of the replies I have received, consensus was not to push this document to IESG. -m Le 17/05/2017 17:18, Carlos Pignataro (cpignata) a crit : > Hi, > > I do not believe SPRING should work > on draft-ietf-spring-sr-oam-requirement. It makes more sense to focus on > solutions than these weak and sparse requirements for very diverse set > of potential protocols (LSP Ping, BFD, S-BFD, SRv6 OAMs, etc). > > Thanks, > > Carlos. > >> On May 16, 2017, at 4:18 AM, Greg Mirsky > > wrote: >> >> Dear Authors, >> I'd like to bring your attention to the WG document OAM Requirements >> for Segment Routing Network >> . >> I think that many requirements listed in your document are common >> requirements for OAM in Segment Routing network listed in the above >> mentioned document. >> >> Kind regards, >> Greg >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > From nobody Tue May 23 00:12:47 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 3ECCF129458; Tue, 23 May 2017 00:12:45 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.51.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149552356519.15645.3933990553372072466@ietfa.amsl.com> Date: Tue, 23 May 2017 00:12:45 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-resiliency-use-cases-11.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 May 2017 07:12:45 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking of the IETF. Title : Resiliency use cases in SPRING networks Authors : Clarence Filsfils Stefano Previdi Bruno Decraene Rob Shakir Filename : draft-ietf-spring-resiliency-use-cases-11.txt Pages : 11 Date : 2017-05-23 Abstract: This document identifies and describes the requirements for a set of use cases related to network resiliency on Segment Routing (SPRING) networks. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-resiliency-use-cases/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-resiliency-use-cases-11 https://datatracker.ietf.org/doc/html/draft-ietf-spring-resiliency-use-cases-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-resiliency-use-cases-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue May 23 00:14:07 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A52141294F8 for ; Tue, 23 May 2017 00:14:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.523 X-Spam-Level: X-Spam-Status: No, score=-14.523 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jp2LWwQfQo7b for ; Tue, 23 May 2017 00:14:04 -0700 (PDT) Received: from alln-iport-4.cisco.com (alln-iport-4.cisco.com [173.37.142.91]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D3C8B1294F4 for ; Tue, 23 May 2017 00:14:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1775; q=dns/txt; s=iport; t=1495523643; x=1496733243; h=from:to:subject:date:message-id:references:in-reply-to: content-id:content-transfer-encoding:mime-version; bh=4ug3JTStSswb6A5/dhppPaLw9M+vZHUI1W+VIe0b9ew=; b=X8ES5MKuq8jzr4x5ljDCm29aXS0lwH92yHxvXX/XpXuEbSR/vh3fKDDR dL/54qwkEK9hdRB3HV/1o2Be/a7/AHn61MBMuhUBQc8/QR3kLIs+1vbMX Tp3PqTicIX1Hq2uvHqe6Z0XbyOCzYxNr5kIxB65yeK1Y+RXC5S65beaWT I=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CYAAAu4CNZ/5FdJa1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1VigQwHjgCRdpV3gg8hDYUsSgKEez8YAQIBAQEBAQEBayiFGAE?= =?us-ascii?q?BAQECAQEBODQQCwIBCBgeECcLJQIEE4oeCA6wN4tHAQEBAQEBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBHYZfggmCcIMhgUKDQYIxBZZ3hyEBhx+MBguBelWEZ4oxlEkBHziBCnE?= =?us-ascii?q?VHCoSAYZjdogSgQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.38,381,1491264000"; d="scan'208";a="428075032" Received: from rcdn-core-9.cisco.com ([173.37.93.145]) by alln-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 23 May 2017 07:14:03 +0000 Received: from XCH-RTP-007.cisco.com (xch-rtp-007.cisco.com [64.101.220.147]) by rcdn-core-9.cisco.com (8.14.5/8.14.5) with ESMTP id v4N7E2Wx013223 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Tue, 23 May 2017 07:14:02 GMT Received: from xch-rtp-010.cisco.com (64.101.220.150) by XCH-RTP-007.cisco.com (64.101.220.147) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 23 May 2017 03:14:01 -0400 Received: from xch-rtp-010.cisco.com ([64.101.220.150]) by XCH-RTP-010.cisco.com ([64.101.220.150]) with mapi id 15.00.1210.000; Tue, 23 May 2017 03:14:01 -0400 From: "Stefano Previdi (sprevidi)" To: SPRING WG Thread-Topic: [spring] I-D Action: draft-ietf-spring-resiliency-use-cases-11.txt Thread-Index: AQHS05P/ooKehy7MwEWZmgL4cxey2qIBxDiA Date: Tue, 23 May 2017 07:14:01 +0000 Message-ID: References: <149552356519.15645.3933990553372072466@ietfa.amsl.com> In-Reply-To: <149552356519.15645.3933990553372072466@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.87.119] Content-Type: text/plain; charset="us-ascii" Content-ID: <21FB2AC4F780BD40A57B8B116061AA78@emea.cisco.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [spring] I-D Action: draft-ietf-spring-resiliency-use-cases-11.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 May 2017 07:14:06 -0000 latest addressed comments. Thanks. s. > On May 23, 2017, at 9:12 AM, internet-drafts@ietf.org wrote: >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Source Packet Routing in Networking of t= he IETF. >=20 > Title : Resiliency use cases in SPRING networks > Authors : Clarence Filsfils > Stefano Previdi > Bruno Decraene > Rob Shakir > Filename : draft-ietf-spring-resiliency-use-cases-11.txt > Pages : 11 > Date : 2017-05-23 >=20 > Abstract: > This document identifies and describes the requirements for a set of > use cases related to network resiliency on Segment Routing (SPRING) > networks. >=20 >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-spring-resiliency-use-cases/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-spring-resiliency-use-cases-11 > https://datatracker.ietf.org/doc/html/draft-ietf-spring-resiliency-use-ca= ses-11 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-resiliency-use-case= s-11 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Wed May 24 14:43:58 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 32A06129494; Wed, 24 May 2017 14:43:57 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.51.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149566223716.8685.8429343804641347209@ietfa.amsl.com> Date: Wed, 24 May 2017 14:43:57 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-conflict-resolution-04.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 May 2017 21:43:57 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking of the IETF. Title : Segment Routing MPLS Conflict Resolution Authors : Les Ginsberg Peter Psenak Stefano Previdi Martin Pilka Filename : draft-ietf-spring-conflict-resolution-04.txt Pages : 20 Date : 2017-05-24 Abstract: In support of Segment Routing (SR) for an MPLS data plane routing protocols advertise a variety of identifiers used to define the segments which direct forwarding of packets. In cases where the information advertised by a given protocol instance is either internally inconsistent or conflicts with advertisements from another protocol instance a means of achieving consistent forwarding behavior in the network is required. This document defines the policies used to resolve these occurrences. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-conflict-resolution/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-conflict-resolution-04 https://datatracker.ietf.org/doc/html/draft-ietf-spring-conflict-resolution-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-conflict-resolution-04 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Wed May 24 14:50:25 2017 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BDF0A128CFF for ; Wed, 24 May 2017 14:50:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dSYHjTeXOjSg for ; Wed, 24 May 2017 14:50:21 -0700 (PDT) Received: from rcdn-iport-9.cisco.com (rcdn-iport-9.cisco.com [173.37.86.80]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2A47C1289B0 for ; Wed, 24 May 2017 14:50:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2718; q=dns/txt; s=iport; t=1495662621; x=1496872221; h=from:to:subject:date:message-id:references:in-reply-to: content-transfer-encoding:mime-version; bh=KY3USW6cGLHj2KZvhfQRbGt1+rdOJn+7Op4dUBmbOmE=; b=iXDokdyHb1gfln7hq4ZgZ5SRB6CUrYKK0S75h1fOYatIEf/Rn3fxYMdn vA2YyaV5Idt4E5X2113DL3FGdP20yasWpwxVORTygzto3Tn0oRmrSlFJr tHP/3kLFYIc6EXeczX33EmhAPr+0pXhbSRVxSTe2GgiJ81BGlceAYz8fJ c=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CYAAAG/yVZ/5FdJa1cGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBg1VigQwHjgCRXJV3gg8hDYUsSgKCcz8YAQIBAQEBAQEBax0LhRg?= =?us-ascii?q?BAQEBAwEBODQXBAIBCBEEAQEfCQcnCxQJCAIEEwiKHg6wJYtBAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBHYZfgV6DHIMihzQFniMBhx+Lf4IPVYRnijWUTQEfOIEKcRU?= =?us-ascii?q?cKoZ2dog1gQ0BAQE?= X-IronPort-AV: E=Sophos;i="5.38,388,1491264000"; d="scan'208";a="247338086" Received: from rcdn-core-9.cisco.com ([173.37.93.145]) by rcdn-iport-9.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 May 2017 21:50:20 +0000 Received: from XCH-ALN-004.cisco.com (xch-aln-004.cisco.com [173.36.7.14]) by rcdn-core-9.cisco.com (8.14.5/8.14.5) with ESMTP id v4OLoKD0005422 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Wed, 24 May 2017 21:50:20 GMT Received: from xch-aln-001.cisco.com (173.36.7.11) by XCH-ALN-004.cisco.com (173.36.7.14) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 24 May 2017 16:50:19 -0500 Received: from xch-aln-001.cisco.com ([173.36.7.11]) by XCH-ALN-001.cisco.com ([173.36.7.11]) with mapi id 15.00.1210.000; Wed, 24 May 2017 16:50:19 -0500 From: "Les Ginsberg (ginsberg)" To: "spring@ietf.org" Thread-Topic: [spring] I-D Action: draft-ietf-spring-conflict-resolution-04.txt Thread-Index: AQHS1NbdC+8en3HHo0WSa3Oq28wlp6IEBF6w Date: Wed, 24 May 2017 21:50:19 +0000 Message-ID: References: <149566223716.8685.8429343804641347209@ietfa.amsl.com> In-Reply-To: <149566223716.8685.8429343804641347209@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.61.9] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [spring] I-D Action: draft-ietf-spring-conflict-resolution-04.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 May 2017 21:50:23 -0000 Folks - This version is a significant revision. Changes include: 1) "Ignore-overlap-only" is defined as the standardized policy. Alternate p= olicies have been moved to a historical appendix. 2)Some extensions to the use of "preference" have been defined to prefer IG= P/SRMS advertisements over BGP advertisements We look forward to your comments. Les > -----Original Message----- > From: spring [mailto:spring-bounces@ietf.org] On Behalf Of internet- > drafts@ietf.org > Sent: Wednesday, May 24, 2017 2:44 PM > To: i-d-announce@ietf.org > Cc: spring@ietf.org > Subject: [spring] I-D Action: draft-ietf-spring-conflict-resolution-04.tx= t >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Source Packet Routing in Networking of t= he > IETF. >=20 > Title : Segment Routing MPLS Conflict Resolution > Authors : Les Ginsberg > Peter Psenak > Stefano Previdi > Martin Pilka > Filename : draft-ietf-spring-conflict-resolution-04.txt > Pages : 20 > Date : 2017-05-24 >=20 > Abstract: > In support of Segment Routing (SR) for an MPLS data plane routing > protocols advertise a variety of identifiers used to define the > segments which direct forwarding of packets. In cases where the > information advertised by a given protocol instance is either > internally inconsistent or conflicts with advertisements from another > protocol instance a means of achieving consistent forwarding behavior > in the network is required. This document defines the policies used > to resolve these occurrences. >=20 >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-spring-conflict-resolution/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-spring-conflict-resolution-04 > https://datatracker.ietf.org/doc/html/draft-ietf-spring-conflict-resoluti= on-04 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-conflict-resolution= -04 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Mon May 29 04:52:39 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id E9AAA129527; Mon, 29 May 2017 04:52:29 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.51.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149605874991.3966.4866503046019250392@ietfa.amsl.com> Date: Mon, 29 May 2017 04:52:29 -0700 Archived-At: Subject: [spring] I-D Action: draft-filsfils-spring-large-scale-interconnect-06.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 May 2017 11:52:30 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking of the IETF. Title : Interconnecting Millions Of Endpoints With Segment Routing Authors : Clarence Filsfils Dennis Cai Stefano Previdi Wim Henderickx Dave Cooper Tim Laberge Steven Lin Bruno Decraene Luay Jalil Jeff Tantsura Rob Shakir Filename : draft-filsfils-spring-large-scale-interconnect-06.txt Pages : 11 Date : 2017-05-29 Abstract: This document describes an application of Segment Routing to scale the network to support hundreds of thousands of network nodes, and tens of millions of physical underlay endpoints. This use-case can be applied to the interconnection of massive-scale DC's and/or large aggregation networks. Forwarding tables of midpoint and leaf nodes only require a few tens of thousands of entries. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-filsfils-spring-large-scale-interconnect/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-filsfils-spring-large-scale-interconnect-06 https://datatracker.ietf.org/doc/html/draft-filsfils-spring-large-scale-interconnect-06 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-filsfils-spring-large-scale-interconnect-06 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue May 30 06:55:18 2017 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 83E7E12954E; Tue, 30 May 2017 06:55:03 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Stewart Bryant To: Cc: draft-bashandy-rtgwg-segment-routing-uloop.all@ietf.org, rtgwg@ietf.org, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.52.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149615250349.14821.15412224026719218818@ietfa.amsl.com> Date: Tue, 30 May 2017 06:55:03 -0700 Archived-At: Subject: [spring] Rtgdir early review of draft-bashandy-rtgwg-segment-routing-uloop-00 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.22 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 May 2017 13:55:03 -0000 Reviewer: Stewart Bryant Review result: Has Issues I have been asked to perform an early review of this document on behalf of the Routing Directorate. Summary: A document on this subject is something that the WG should publish, but I think that there are number of issues that the WG need to discuss and reach consensus on before deciding whether or not they should adopt this draft as a starting point for that work. Major Issues: Before I get into the substance I am surprised that there are no IPR disclosures. In an earlier and related work (draft-francois-segment-routing-ti-lfa-00) there were three IPR disclosures. The work has four basic components, the concept of resolving the problem of P and Q being non-adjacent, the use of SR to solve the non-adjacency, the use of the post convergence path following failure and the applicability of these techniques to an SR network. The first and second points seem of utility in non-SR networks, and so I am surprised that they are not called out as such, in the first case perhaps with consideration to strategically places RSVP tunnels, or binding segments. The issue of mapping repair path to the post convergence path to the something that has always concerned me in this concept. It is true that traffic that always passes through the PLR will experience the properties the authors describe, but not all traffic will pass through the PLR post convergence. The post failure path will be topology dependent, and may take a different path from the point of ingress. I am also concerned that the authors do not discuss the need for loop free convergence, since although traffic going through the repair path will be loop-free, traffic arriving at the PLR might not be. Consider for example a topology fragment that looks like a clock with a router at each minute. Traffic enters at 9 o'clock, leave at 3 o'clock and goes via 12 o'clock and 12 o'clock fails. The routers 9..12 will re-converge at different times and this may give rise to the micro-looping of traffic trying to get to the PLR. A summary of the problem and a pointer to the companion draft may be sufficient. Finally on the basic concept it would be good to state up from whether the proposal is constrained solely to SR networks, or whether the authors believe that the concept is of wider applicability. It see no reason why it would be constrained to only work on SR networks. There is no discussion of multiple failures, nor as far as I can see of failures that are worse than anticipated. This is an important point that needs to be established early. Some methods, (MRT) intrinsically address multiple failures, others (NV) intrinsically exclude them. Simple LFA needs a supervisor to quickly abandon all hope when they occur. In an SR network the paths used are not the shortest paths, they are a collection of shortest paths, so there needs to be some discussion on the interaction between the SR paths and repair paths to consider whether it is unconditionally safe against forwarding loops. It would presumably be so if the authors borrowed the concept of repair addresses rather than normal forwarding addresses from not-via, but I don't think they have done this. There should also be some discussion on the original path constraints that are applicable to the repair. Presumably the ingress node constrained the traffic to go though failed node F for a reason. If the repair is unconstrained that reason could be violated, but this is not discussed in the text. In the Security section you say: The behavior described in this document is internal functionality to a router that result in the ability to guarantee an upper bound on the time taken to restore traffic flow upon the failure of a directly connected link or node. As such no additional security risk is introduced by using the mechanisms proposed in this document. SB> I am not sure that the above is correct. There may be a security reason SB> why a packet was steered along a path which breaks when you use this SB> technique. In the conclusion you say: The mechanism is able to calculate the backup path irrespective of the topology as long as the topology is sufficiently redundant. SB> That is certainly true in classic. I am not sure this is universally SB> true under SR which includes the use of non-shortest path and SB> binding segments. Minor issues: For each destination in the network, TI-LFA prepares a data-plane switch-over to be activated upon detection of the failure of a link used to reach the destination. SB> To make the scaling clearer to the reader, I think you need SB> to make it clear that for each protected link, you determine SB> the repair needed to reach every destination reachable over that SB> link. You sort of say that, but it's a bit hidden. We provide the TI-LFA approach that achieves guaranteed coverage against link, node, and local SRLG failure, in any IGP network, relying on the flexibility of SR. SB> Should that be any SINGLE link.... failure? In the text (and the text that follows) To do so, S applies a "NEXT" operation on Adj(S-F) and then two consecutive "PUSH" operations: first it pushes a node segment for F, and then it pushes a protection list allowing to reach F while bypassing S-F. You need to reference the SR operations. Also you are considering Adj segments, and presumably they were there for a reason, but you do not discuss that. In 5.3.1 and 5.3.2 you have a list of conditions, but do not make it clear whether any or all must be true. Nits 1. Introduction Segment Routing aims at supporting services with tight SLA guarantees [1]. This document provides a local repair mechanism relying on SR-capable of restoring end-to-end connectivity in the case of a sudden failure of a network component. SB> Grammar needs a little work in the last sentence. In Fig 1, I assume that the blobs are network fragments. In the conclusion you say: This document proposes a mechanism that is able to pre-calculate a backup path for every primary path so as to be able to protect against the failure of a directly connected link or node. SB> you need to add SRLG