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score=-2.618 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, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, WEIRD_PORT=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 BvmYJ4WgbSIL for ; Wed, 2 Nov 2016 06:25:17 -0700 (PDT) Received: from relais-inet.francetelecom.com (relais-ias92.francetelecom.com [193.251.215.92]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3AA9012951A for ; Wed, 2 Nov 2016 06:25:17 -0700 (PDT) Received: from omfedm07.si.francetelecom.fr (unknown [xx.xx.xx.3]) by omfedm12.si.francetelecom.fr (ESMTP service) with ESMTP id 52F1B18C4C7 for ; Wed, 2 Nov 2016 14:25:15 +0100 (CET) Received: from Exchangemail-eme2.itn.ftgroup (unknown [10.114.31.69]) by omfedm07.si.francetelecom.fr (ESMTP service) with ESMTP id 12D034C06D for ; Wed, 2 Nov 2016 14:25:15 +0100 (CET) Received: from OPEXCLILM21.corporate.adroot.infra.ftgroup ([fe80::e92a:c932:907e:8f06]) by OPEXCLILMA2.corporate.adroot.infra.ftgroup ([fe80::bc1c:ad2f:eda3:8c3d%18]) with mapi id 14.03.0319.002; Wed, 2 Nov 2016 14:25:15 +0100 From: To: "spring@ietf.org" Thread-Topic: IETF 97 - Seoul - Agenda Thread-Index: AdI1CiTVsWWC5M1mT669N74IZ4n93Q== Date: Wed, 2 Nov 2016 13:25:14 +0000 Message-ID: <14789_1478093115_5819E93B_14789_253_1_53C29892C857584299CBF5D05346208A1EC5677B@OPEXCLILM21.corporate.adroot.infra.ftgroup> 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="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-PMX-Version: 6.2.1.2478543, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2016.6.17.114517 Archived-At: Subject: [spring] IETF 97 - Seoul - Agenda X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 02 Nov 2016 13:25:19 -0000 Hi all, We have just uploaded the SPRING agenda https://datatracker.ietf.org/meetin= g/97/session/spring We have a full agenda so it will help if we can pre-arrange for a note-take= r and a jabber scribe. The Etherpad tool is one good option for collaborative note-taking. http://= etherpad.tools.ietf.org:9000/p/notes-ietf-97-spring?useMonospaceFont=3Dtrue =20 Please consider volunteering.=20 Notes do not have to be perfect: they are reviewed by the WG, and I usually= (try to) review them using the video recording. Authors, - please send your slides to the chairs by Tuesday morning 09:00 local time= . Sooner is better. - please consider this checklist https://trac.tools.ietf.org/wg/spring/trac= /wiki/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting Thanks in advance. --Bruno, Martin > -----Original Message----- > From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Martin Vigour= eux > Sent: Tuesday, October 18, 2016 10:32 AM > To: spring@ietf.org > Subject: [spring] Slots requests for SPRING WG session - IETF 97 - Seoul >=20 > All, >=20 > it is time we start building the SPRING WG agenda for Seoul. > The IETF agenda is available at: > https://datatracker.ietf.org/meeting/97/agenda.html > Please note that it is still a preliminary agenda. >=20 > The SPRING WG session (1.5h) is currently scheduled on > Thursday, 17th of November, Morning session I 09:30-11:00 (local time) >=20 > Please send us your request for a presentation slot, indicating > draft name, speaker and desired duration (covering presentation + > discussion) >=20 > Please send the requests no later than the 30th of October. > Thank you >=20 > M&B >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring ___________________________________________________________________________= ______________________________________________ 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 Thu Nov 3 10:57:04 2016 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 B9074129AC4; Thu, 3 Nov 2016 10:57:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.018 X-Spam-Level: X-Spam-Status: No, score=-16.018 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=-1.497, 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 cgjt4zUaiUTi; Thu, 3 Nov 2016 10:56:59 -0700 (PDT) Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 35EAC129965; Thu, 3 Nov 2016 10:56:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2768; q=dns/txt; s=iport; t=1478195819; x=1479405419; h=message-id:date:from:mime-version:to:cc:subject: references:in-reply-to:content-transfer-encoding; bh=eZoVgo/xOL5XrcNBKJjadL5f58/gMkyRIsrihwxANCQ=; b=cNt4NvzJJmeYQvL12tWqMSNS4rK2qhUBnX0FNjF19fPNG/nOF3TetrY0 0F5UPlVxDr8j+9+OciuUT9/6QhdP25ixdrsAL+EE9RI+7yrXj8fnrF+4a XNp54Jy8pz0sKjmWCpW4mkY2hVaBgnO7HcrqLTR4HiMSpWSWFmIwMW1CH A=; X-IronPort-AV: E=Sophos;i="5.31,587,1473120000"; d="scan'208";a="167122120" Received: from alln-core-3.cisco.com ([173.36.13.136]) by rcdn-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 03 Nov 2016 17:56:58 +0000 Received: from [10.154.160.71] ([10.154.160.71]) by alln-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id uA3Huws4008701; Thu, 3 Nov 2016 17:56:58 GMT Message-ID: <581B7A6A.8070202@cisco.com> Date: Thu, 03 Nov 2016 10:56:58 -0700 From: "Ahmed Bashandy (bashandy)" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: spring@ietf.org References: <12104508-FA42-4237-AC1E-358781A121DD@juniper.net> <17664_1470654625_57A868A1_17664_334_1_9E32478DFA9976438E7A22F69B08FF921BD1AABF@OPEXCLILMA4.corporate.adroot.infra.ftgroup> <57D2A38E.7020805@nokia.com> In-Reply-To: <57D2A38E.7020805@nokia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Cc: spring-chairs@ietf.org Subject: Re: [spring] =?utf-8?q?IPR_for_draft=E2=80=90ietf-spring-segment?= =?utf-8?q?=E2=80=90routing-mpls_prior_to_WGLC?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 03 Nov 2016 17:57:03 -0000 I’m not aware of any IPR that hasn’t been disclosed already. Thanks Ahmed On 9/9/2016 4:57 AM, Martin Vigoureux wrote: > Authors and Contributors, > > it seems that we are missing answers to the IPR question from a good > number of people: > > Authors: Clarence, Ahmed, Martin, and Edward > Contributors: Igor and Saku > > Please do respond. We need this to move forward. > > Thanks > -m > > Le 08/08/2016 13:10, stephane.litkowski@orange.com a écrit : >> Hi, >> >> I'm not aware of any IPR for this doc. >> >> Brgds, >> >> Stephane >> >> -----Original Message----- >> From: John G.Scudder [mailto:jgs@juniper.net] >> Sent: Sunday, July 24, 2016 14:52 >> To: draft-ietf-spring-segment-routing-mpls@ietf.org >> Cc: spring@ietf.org >> Subject: IPR for draft‐ietf-spring-segment‐routing-mpls prior to WGLC >> >> Dear Authors: >> >> As we discussed at the SPRING meeting, working group last call has >> been requested for draft‐ietf-spring-segment‐routing-mpls. Before we >> begin the WGLC, please indicate whether you are aware of any relevant >> IPR and if so, whether it has been disclosed. (Please do this even if >> you've done it before, thanks for your help.) Please cc the WG in >> your reply. >> >> As soon as this has been collected from all authors, we'll start the >> WGLC. >> >> Thanks, >> >> --Bruno and John >> >> _________________________________________________________________________________________________________________________ >> >> >> Ce message et ses pieces jointes peuvent contenir des informations >> confidentielles 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 electroniques 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 information 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 delete 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. >> >> _______________________________________________ >> 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 Thu Nov 3 11:07:40 2016 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 32697129ADB; Thu, 3 Nov 2016 11:07:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.097 X-Spam-Level: X-Spam-Status: No, score=-4.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, RP_MATCHES_RCVD=-1.497, 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 S1LVntUaDH33; Thu, 3 Nov 2016 11:07:37 -0700 (PDT) Received: from relais-inet.orange.com (relais-nor35.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 5BD48129ADE; Thu, 3 Nov 2016 11:07:35 -0700 (PDT) Received: from opfednr01.francetelecom.fr (unknown [xx.xx.xx.65]) by opfednr27.francetelecom.fr (ESMTP service) with ESMTP id 35647A017F; Thu, 3 Nov 2016 19:07:34 +0100 (CET) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.2]) by opfednr01.francetelecom.fr (ESMTP service) with ESMTP id 010401A005F; Thu, 3 Nov 2016 19:07:34 +0100 (CET) Received: from OPEXCLILMA4.corporate.adroot.infra.ftgroup ([fe80::65de:2f08:41e6:ebbe]) by OPEXCLILM21.corporate.adroot.infra.ftgroup ([fe80::e92a:c932:907e:8f06%19]) with mapi id 14.03.0319.002; Thu, 3 Nov 2016 19:07:33 +0100 From: To: John G.Scudder , "draft-ietf-spring-segment-routing@ietf.org" Thread-Topic: IPR for draft-ietf-spring-segment-routing prior to (additional) WGLC Thread-Index: AQHR5and3G3u/uXoR0m35lDkfy4AoKDILsdA Date: Thu, 3 Nov 2016 18:07:33 +0000 Message-ID: <3366_1478196454_581B7CE6_3366_4133_1_9E32478DFA9976438E7A22F69B08FF921DB6D6E2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> References: <13C3A727-447A-4C96-ACDC-641EF4A4ECB4@juniper.net> In-Reply-To: <13C3A727-447A-4C96-ACDC-641EF4A4ECB4@juniper.net> 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="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] IPR for draft-ietf-spring-segment-routing prior to (additional) WGLC X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 03 Nov 2016 18:07:38 -0000 Hi, Seems my reply was missing, sorry for that. I'm not aware of any IPR that hasn't been disclosed already. Brgds, -----Original Message----- From: John G.Scudder [mailto:jgs@juniper.net]=20 Sent: Sunday, July 24, 2016 14:49 To: draft-ietf-spring-segment-routing@ietf.org Cc: spring@ietf.org Subject: IPR for draft-ietf-spring-segment-routing prior to (additional) WG= LC Dear Authors: As we discussed at the SPRING meeting, a second working group last call has= been requested for draft-ietf-spring-segment-routing. Before we begin the = WGLC, please indicate whether you are aware of any relevant IPR and if so, = whether it has been disclosed. (Please do this even if you've done it befor= e, thanks for your help.) Please cc the WG in your reply. As soon as this has been collected from all authors, we'll start the WGLC. Thanks, --Bruno and John ___________________________________________________________________________= ______________________________________________ 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 Thu Nov 3 12:01:28 2016 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 80E0912957A; Thu, 3 Nov 2016 12:01:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.018 X-Spam-Level: X-Spam-Status: No, score=-16.018 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=-1.497, 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 nj0MWtJ8bZbS; Thu, 3 Nov 2016 12:01:25 -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 A309C1297AC; Thu, 3 Nov 2016 12:00:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3055; q=dns/txt; s=iport; t=1478199656; x=1479409256; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=mq/LiuteGGTyoW3elRNcs/86iGjfyzIudOQbU8TOG0U=; b=R4JQTl2+TSaibJME/dcEln+EMRYq005mo1fbk0DDefgPaGuVP9T93pj3 j/QAyAEGYIG0LpxitkOe4G8yByjblZH5qjeM+fNy7NNex7Js5EF3n5SGX /Ny+GRyJJ1SKrfcuFaoA6uhj4BfVGBSEJTY0kwP678Oo45usR1wa6qM41 w=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AcAQBRiBtY/5BdJa1eGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgzABAQEBAR9YfI03lwGUR4IIHQuFMEoCggM/FAECAQEBAQEBAWI?= =?us-ascii?q?dC4RhAQEBAwEBAQE3NAsFBwQCAQgRBAEBAR4JBycLFAkIAgQOBYhOCA67aQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEBAQEBARcFiDyCWIQZEQEcgzGCLwWaIAGQPIFuhG+JLY0?= =?us-ascii?q?dhAMBHjdrhR9yhU6CLAEBAQ?= X-IronPort-AV: E=Sophos;i="5.31,587,1473120000"; d="scan'208";a="169382149" Received: from rcdn-core-8.cisco.com ([173.37.93.144]) by rcdn-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Nov 2016 19:00:55 +0000 Received: from XCH-ALN-001.cisco.com (xch-aln-001.cisco.com [173.36.7.11]) by rcdn-core-8.cisco.com (8.14.5/8.14.5) with ESMTP id uA3J0tKD027538 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Thu, 3 Nov 2016 19:00:55 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; Thu, 3 Nov 2016 14:00:55 -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, 3 Nov 2016 14:00:55 -0500 From: "Mark Townsley (townsley)" To: "bruno.decraene@orange.com" Thread-Topic: [spring] IPR for draft-ietf-spring-ipv6-use-cases prior to WGLC Thread-Index: AQHR5amar1yxaA1coky36smUI2MNuqBxJ1DQgBqvecCAPGcZPQ== Date: Thu, 3 Nov 2016 19:00:54 +0000 Message-ID: <3E1BE84E-4F0C-42CB-AA18-880CD411C5A3@cisco.com> References: , <24208_1474879106_57E8DE82_24208_5395_1_53C29892C857584299CBF5D05346208A0F9DCFAD@OPEXCLILM21.corporate.adroot.infra.ftgroup> In-Reply-To: <24208_1474879106_57E8DE82_24208_5395_1_53C29892C857584299CBF5D05346208A0F9DCFAD@OPEXCLILM21.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" , "draft-ietf-spring-ipv6-use-cases@ietf.org" Subject: Re: [spring] IPR for draft-ietf-spring-ipv6-use-cases prior to WGLC X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 03 Nov 2016 19:01:27 -0000 I am not aware of IPR that has not been disclosed already or is in need of = disclosing for draft-ietf-spring-use-cases.=20 Apologies for the late response. - Mark > On Sep 26, 2016, at 10:38 AM, "bruno.decraene@orange.com" wrote: >=20 > Mark, Clarence, >=20 > IINM, we are missing IPR statement from you. >=20 > Could you please reply to the IPR call, on the spring mailing list? >=20 > Thanks, > Regards, > --Bruno >=20 >> From: DECRAENE Bruno IMT/OLN >> Sent: Friday, September 09, 2016 11:09 AM >> To: draft-ietf-spring-ipv6-use-cases@ietf.org >> Cc: martin.vigoureux@nokia.com >> Subject: RE: [spring] IPR for draft-ietf-spring-ipv6-use-cases prior to = WGLC >>=20 >> Mark, Clarence, >>=20 >> IINM, we are missing IPR statement from you. >>=20 >> Could you please reply to the IPR call, on the spring mailing list? >>=20 >> Thanks, >> Regards, >> --Bruno >>=20 >>=20 >>=20 >>=20 >>> -----Original Message----- >>> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of John G.Scudd= er >>> Sent: Sunday, July 24, 2016 2:48 PM >>> To: draft-ietf-spring-ipv6-use-cases@ietf.org >>> Cc: spring@ietf.org >>> Subject: [spring] IPR for draft-ietf-spring-ipv6-use-cases prior to WGL= C >>>=20 >>> Dear Authors: >>>=20 >>> As we discussed at the SPRING meeting, working group last call has been= requested for >>> draft-ietf-spring-ipv6-use-cases. Before we begin the WGLC, please indi= cate whether >> you >>> are aware of any relevant IPR and if so, whether it has been disclosed.= (Please do this >> even >>> if you've done it before, thanks for your help.) Please cc the WG in yo= ur reply. >>>=20 >>> As soon as this has been collected from all authors, we'll start the WG= LC. >>>=20 >>> Thanks, >>>=20 >>> --Bruno and John >>>=20 >>> _______________________________________________ >>> spring mailing list >>> spring@ietf.org >>> https://www.ietf.org/mailman/listinfo/spring >=20 > _________________________________________________________________________= ________________________________________________ >=20 > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. >=20 > This message and its attachments may contain confidential or privileged i= nformation 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 de= lete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > Thank you. >=20 From nobody Thu Nov 3 12:04:34 2016 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 86DC3129431; Thu, 3 Nov 2016 12:04:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 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] 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 C6nx4dJ3RNZ7; Thu, 3 Nov 2016 12:04:30 -0700 (PDT) Received: from mail-qt0-x22c.google.com (mail-qt0-x22c.google.com [IPv6:2607:f8b0:400d:c0d::22c]) (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 9D9AF1293E3; Thu, 3 Nov 2016 12:04:30 -0700 (PDT) Received: by mail-qt0-x22c.google.com with SMTP id w33so34509645qtc.3; Thu, 03 Nov 2016 12:04:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:from:date:message-id:subject:to:cc; bh=0fkdbFBBWQc2Wtb2AqrHw2mtDUgBmCBSwwwU2IsIxm0=; b=m2W+hF8/yWox9mYChHNGg8/PR4V45LKYo0mSZ2a8CaFzehmgwrxXa3+fD61EWEQnAc mfIeVghNchkYWtVjQcfOh1N8s+ZHjq+MvFTDLYd+HnhvAyMnPp6FYdvH5hrJrOPsf+p4 /Xnu0fyMqX1qDVivQ1evEWfz2eSVVwjL1vulVRgM/WDXZxBammsIYW/AdZ29oumiDdKM phaKY+EPGx/Bn1uaoLzMLn7m+/mC9s52Xd4+0zqAJtRRg7Gyjj6VUEH8XlaNprHOR+W/ 7l0hg0OIe5Ed1DNUcK3UGo5RwZ6nTpn8vWzbPnUnCc2McVun5Jh9cFyxxO+4LjaFG/Ra BqpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=0fkdbFBBWQc2Wtb2AqrHw2mtDUgBmCBSwwwU2IsIxm0=; b=h/uOBew23J8mY8ndblmBIHaBT42mGp3hOvo9paLt6fTwZ88OM2bXIArxGVOdTOR3vV TpKWZho8fqnb+0zlZIu/Qcwp7XlMxBwknDFph4w//BOD94fzhs1i83d+BUrosMoRBoF/ ScLrkfBoHX9VubYvdkb7qxqM5ijUOo0Idg6jsAJJT2zMQmlJgW6BJX+0AW3C0IPl4IWS MJPOCw8XbB9OZi4llzsGiRk2J81Nhd8uG/WNSRRk/vE+2ySZKYVnAhD0nPbnncy0qb3n c3eetw/t6o5dMjru856A0S0x8z7VT2xqmFkZr332KElZsoUP3NMf3StKQPetDZiwmpqu dg6A== X-Gm-Message-State: ABUngveTjhsADN5An5hVYp8h4om3rAwLL2ziqfxTqOpqZmnKry1lM6c7xsBPilLCPeT8SYUzNbQI5H2mX4dlVg== X-Received: by 10.237.34.152 with SMTP id p24mr3335916qtc.45.1478199869341; Thu, 03 Nov 2016 12:04:29 -0700 (PDT) MIME-Version: 1.0 Received: by 10.12.161.4 with HTTP; Thu, 3 Nov 2016 12:03:58 -0700 (PDT) From: Edward Date: Thu, 3 Nov 2016 12:03:58 -0700 Message-ID: To: spring@ietf.org Content-Type: multipart/alternative; boundary=001a113d09981e911f05406a3aab Archived-At: Cc: spring-chairs@ietf.org Subject: Re: [spring] =?utf-8?q?IPR_for_draft=E2=80=90ietf-spring-segment?= =?utf-8?q?=E2=80=90routing-mpls_prior_to_WGLC?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 03 Nov 2016 19:04:32 -0000 --001a113d09981e911f05406a3aab Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable I'm unaware of any previously undisclosed IPR associated with this document= . On 9/9/2016 4:57 AM, Martin Vigoureux wrote: Authors and Contributors, it seems that we are missing answers to the IPR question from a good number of people: Authors: Clarence, Ahmed, Martin, and Edward Contributors: Igor and Saku Please do respond. We need this to move forward. Thanks -m Le 08/08/2016 13:10, stephane.litkowski at orange.com a =C3=A9crit : Hi, I'm not aware of any IPR for this doc. Brgds, Stephane -----Original Message----- From: John G.Scudder [mailto:jgs at juniper.net] Sent: Sunday, July 24, 2016 14:52 To: draft-ietf-spring-segment-routing-mpls at ietf.org Cc: spring at ietf.org Subject: IPR for draft=E2=80=90ietf-spring-segment=E2=80=90routing-mpls pri= or to WGLC Dear Authors: As we discussed at the SPRING meeting, working group last call has been requested for draft=E2=80=90ietf-spring-segment=E2=80=90routing-mpls. Befor= e we begin the WGLC, please indicate whether you are aware of any relevant IPR and if so, whether it has been disclosed. (Please do this even if you've done it before, thanks for your help.) Please cc the WG in your reply. As soon as this has been collected from all authors, we'll start the WGLC. Thanks, --Bruno and John ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles 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 electroniques 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 information 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 delete 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. _______________________________________________ spring mailing list spring at ietf.orghttps://www.ietf.org/mailman/listinfo/spring _______________________________________________ spring mailing list spring at ietf.orghttps://www.ietf.org/mailman/listinfo/spring --001a113d09981e911f05406a3aab Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 
I'm unaware of any previousl=
y undisclosed IPR associated with this document. 

On 9/9/2016 4:57 AM, Martin Vigoureux wrote:

Authors and Contributors,
it seems that we are missing answers to the IPR question from a g= ood=20 number of people: 
Authors: Clarence, Ahmed, Martin, and Edward
Contributors: Igor and Saku

Please do respond. We need this to move forward.

Thanks
-m

Le 08/08/2016 13:10, stephane.litkowski at or=
ange.com a =C3=A9crit :

Hi,

I'm not aware of any IPR for this doc.

Brgds,

Stephane

-----Original Message-----
From: John G.Scudder [mailto:jgs at juniper.net]
Sent: Sunday, July 24, 2016 14:52
To: draft-ietf-spring-segment-routing-mpls at i=
etf.org
Cc: spring at ietf.org
Subject: IPR for draft=E2=80=90ietf-spring-segment=E2=80=90routing-mpls pri=
or to WGLC

Dear Authors:
As we discussed at the SPRING meeting, working group last call ha= s=20 been requested for draft=E2=80=90ietf-spring-segment=E2=80=90routi= ng-mpls. Before we=20 begin the WGLC, please indicate whether you are aware of any relev= ant=20 IPR and if so, whether it has been disclosed. (Please do this even= if=20 you've done it before, thanks for your help.) Please cc the WG= in=20 your reply. As soon as this has been collected from all authors, we'll sta= rt the=20 WGLC. 
Thanks,

--Bruno and John
_________________________________________________________________= ________________________________________________________=20 Ce message et ses pieces jointes peuvent contenir des informations= =20 confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous= =20 avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Le= s=20 messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere,=20 deforme ou falsifie. Merci. This message and its attachments may contain confidential or=20 privileged information that may be protected by law; 
they should not be distributed, used or copi=
ed without authorisation.
If you have received this email in error, please notify the sende= r=20 and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that h= ave=20 been modified, changed or falsified. 
Thank you.

_______________________________________________
spring mailing list
spring at ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/spring


______________________________=
_________________
spring mailing list
spring at ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/spring
--001a113d09981e911f05406a3aab-- From nobody Fri Nov 4 02:13:15 2016 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 A0E3E129516; Fri, 4 Nov 2016 02:13:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.107 X-Spam-Level: X-Spam-Status: No, score=-1.107 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RDNS_NONE=0.793] autolearn=no 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 2eFPPCl3iM0n; Fri, 4 Nov 2016 02:13:10 -0700 (PDT) Received: from owl2.lab.dtag.de (unknown [194.25.1.238]) by ietfa.amsl.com (Postfix) with ESMTP id ADB23128874; Fri, 4 Nov 2016 02:13:10 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by owl2.lab.dtag.de (Postfix) with ESMTP id 318FBC9170; Fri, 4 Nov 2016 10:13:07 +0100 (CET) Received: from TSUNAMI-Boggart-60.lab.DTAG.de (o-Boggart.lab.dtag.de [62.153.176.78]) by owl2.lab.dtag.de (Postfix) with ESMTPSA id 1B170C8EB8; Fri, 4 Nov 2016 10:13:07 +0100 (CET) To: spring@ietf.org, spring-chairs@ietf.org References: <12104508-FA42-4237-AC1E-358781A121DD@juniper.net> <17664_1470654625_57A868A1_17664_334_1_9E32478DFA9976438E7A22F69B08FF921BD1AABF@OPEXCLILMA4.corporate.adroot.infra.ftgroup> <57D2A38E.7020805@nokia.com> From: Martin Horneffer Message-ID: Date: Fri, 4 Nov 2016 10:13:09 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <57D2A38E.7020805@nokia.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [spring] =?utf-8?q?IPR_for_draft=E2=80=90ietf-spring-segment?= =?utf-8?q?=E2=80=90routing-mpls_prior_to_WGLC?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 04 Nov 2016 09:13:13 -0000 Hello Martin, and group, I not aware of any IPR concerning this document either. And I'm sorry I missed the call over my parental leave and offlineness. Best regards, Martin Am 09.09.16 um 13:57 schrieb Martin Vigoureux: > Authors and Contributors, > > it seems that we are missing answers to the IPR question from a good > number of people: > > Authors: Clarence, Ahmed, Martin, and Edward > Contributors: Igor and Saku > > Please do respond. We need this to move forward. > > Thanks > -m > > Le 08/08/2016 13:10, stephane.litkowski@orange.com a écrit : >> Hi, >> >> I'm not aware of any IPR for this doc. >> >> Brgds, >> >> Stephane >> >> -----Original Message----- >> From: John G.Scudder [mailto:jgs@juniper.net] >> Sent: Sunday, July 24, 2016 14:52 >> To: draft-ietf-spring-segment-routing-mpls@ietf.org >> Cc: spring@ietf.org >> Subject: IPR for draft‐ietf-spring-segment‐routing-mpls prior to WGLC >> >> Dear Authors: >> >> As we discussed at the SPRING meeting, working group last call has >> been requested for draft‐ietf-spring-segment‐routing-mpls. Before we >> begin the WGLC, please indicate whether you are aware of any relevant >> IPR and if so, whether it has been disclosed. (Please do this even if >> you've done it before, thanks for your help.) Please cc the WG in >> your reply. >> >> As soon as this has been collected from all authors, we'll start the >> WGLC. >> >> Thanks, >> >> --Bruno and John >> >> _________________________________________________________________________________________________________________________ >> >> >> Ce message et ses pieces jointes peuvent contenir des informations >> confidentielles 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 electroniques 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 information 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 delete 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. >> >> _______________________________________________ >> 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 Sat Nov 5 22:51:01 2016 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 C1ED6129585; Sat, 5 Nov 2016 22:51:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.699 X-Spam-Level: X-Spam-Status: No, score=-5.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-1.497, SPF_HELO_PASS=-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 ZPLkz9qgzdNd; Sat, 5 Nov 2016 22:50:59 -0700 (PDT) Received: from puck.nether.net (puck.nether.net [IPv6:2001:418:3f4::5]) by ietfa.amsl.com (Postfix) with ESMTP id B3E94129573; Sat, 5 Nov 2016 22:50:56 -0700 (PDT) Received: by puck.nether.net (Postfix, from userid 507) id 5D019540C54; Sun, 6 Nov 2016 01:50:56 -0400 (EDT) Date: Sun, 6 Nov 2016 01:50:56 -0400 From: Jon Mitchell To: "John G.Scudder" Message-ID: <20161106055055.GB24462@puck.nether.net> References: <5E9BF5C9-9E90-4243-8CD8-DEF19164954E@juniper.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5E9BF5C9-9E90-4243-8CD8-DEF19164954E@juniper.net> User-Agent: Mutt/1.7.1 (2016-10-04) Archived-At: Cc: draft-ietf-spring-segment-routing-msdc@ietf.org, spring@ietf.org Subject: Re: [spring] IPR for draft-ietf-spring-segment-routing-msdc prior to WGLC X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Nov 2016 05:51:01 -0000 On 24/07/16 14:50 +0200, John G.Scudder wrote: > Dear Authors: > > As we discussed at the SPRING meeting, working group last call has been requested for draft-ietf-spring-segment-routing-msdc. Before we begin the WGLC, please indicate whether you are aware of any relevant IPR and if so, whether it has been disclosed. (Please do this even if you've done it before, thanks for your help.) Please cc the WG in your reply. > > As soon as this has been collected from all authors, we'll start the WGLC. I'm only aware of IPR as already disclosed regarding EPE. Jon From nobody Tue Nov 8 20:24:02 2016 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 6984A12943E for ; Tue, 8 Nov 2016 20:24:01 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.001 X-Spam-Level: X-Spam-Status: No, score=-2.001 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=yandex-team.ru 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 8kYscdDAFA6x for ; Tue, 8 Nov 2016 20:23:58 -0800 (PST) Received: from forwardcorp1m.cmail.yandex.net (forwardcorp1m.cmail.yandex.net [5.255.216.198]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B0A5E1295AD for ; Tue, 8 Nov 2016 20:23:58 -0800 (PST) Received: from smtpcorp1m.mail.yandex.net (smtpcorp1m.mail.yandex.net [IPv6:2a02:6b8:0:2519::120]) by forwardcorp1m.cmail.yandex.net (Yandex) with ESMTP id D2EC220730; Wed, 9 Nov 2016 07:23:55 +0300 (MSK) Received: from smtpcorp1m.mail.yandex.net (localhost.localdomain [127.0.0.1]) by smtpcorp1m.mail.yandex.net (Yandex) with ESMTP id CEE534B40885; Wed, 9 Nov 2016 07:23:55 +0300 (MSK) Received: from 84.201.165.250-vpna.dhcp.yndx.net (84.201.165.250-vpna.dhcp.yndx.net [84.201.165.250]) by smtpcorp1m.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id 3T3wmVMO5R-Nt64BsNN; Wed, 09 Nov 2016 07:23:55 +0300 (using TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (Client certificate not present) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1478665435; bh=b9rOx/6L+vhMihD6/OOWSRmLD7N0UujMQu42E0WRS60=; h=Subject:From:In-Reply-To:Date:Cc:Message-Id:References:To; b=n9PWUCRbupMiOAxEW8vsk+LC3+5NQLQ3KYjd/PdfLuAEJbw4cju3GDfww6WbkiSO/ M3++1f4AEwPmDQSw4aEqIhk930txd3Mp4Tzlc3HKZ3eWYxHHwgAQrG2QlQmdLeP+yV gYgYCZPM4O0F9AAySAtS5SZjU0YtL39+iy9/I8kA= Authentication-Results: smtpcorp1m.mail.yandex.net; dkim=pass header.i=@yandex-team.ru Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: Dmitry Afanasiev In-Reply-To: <57D2A25A.9080205@nokia.com> Date: Wed, 9 Nov 2016 07:23:55 +0300 Content-Transfer-Encoding: quoted-printable Message-Id: References: <3CCBF587-3720-4051-BCF4-3597E587E575@juniper.net> <57D2A25A.9080205@nokia.com> To: spring@ietf.org, "John G.Scudder" X-Mailer: Apple Mail (2.2104) Archived-At: Cc: sprevidi@cisco.com Subject: Re: [spring] IPR for draft-ietf-spring-segment-routing-central-epe prior to WGLC X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 09 Nov 2016 04:24:01 -0000 I'm not aware of non-disclosed IPR. Regards, Dmitry > On Sep 9, 2016, at 14:51, Martin Vigoureux = wrote: >=20 > Authors >=20 > it seems that we are missing answers to the IPR question from = Clarence, Dimitry, and Daniel. >=20 > Please do respond. We need this to move forward. >=20 > Thanks > -m >=20 >=20 > Le 24/07/2016 14:50, John G.Scudder a =E9crit : >> Dear Authors: >>=20 >> As we discussed at the SPRING meeting, working group last call has = been requested for draft-ietf-spring-segment-routing-central-epe. Before = we begin the WGLC, please indicate whether you are aware of any relevant = IPR and if so, whether it has been disclosed. (Please do this even if = you've done it before, thanks for your help.) Please cc the WG in your = reply. >>=20 >> As soon as this has been collected from all authors, we'll start the = WGLC. >>=20 >> Thanks, >>=20 >> --Bruno and John >>=20 >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring >>=20 >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Wed Nov 9 08:04:01 2016 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 91861129466 for ; Wed, 9 Nov 2016 08:03:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.871 X-Spam-Level: X-Spam-Status: No, score=-0.871 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, MISSING_HEADERS=1.021, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: ecitele.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_HE1PR0301MB226678AAB49427CB775EE4EF9DB90HE1PR0301MB2266_" MIME-Version: 1.0 X-OriginatorOrg: ecitele.com X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Nov 2016 16:03:54.0229 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2c514a61-08de-4519-b4c0-921fef62c42a X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0301MB2265 Archived-At: Subject: [spring] FW: Node Protection for SR-TE Paths: an expired draft X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 09 Nov 2016 16:04:00 -0000 --_000_HE1PR0301MB226678AAB49427CB775EE4EF9DB90HE1PR0301MB2266_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: Alexander Vainshtein Sent: Monday, November 07, 2016 5:56 PM To: 'shraddha@juniper.net' ; 'cbowers@juniper.net' Cc: 'spring@ietf.com' Subject: Node Protection for SR-TE Paths: an expired draft Hi all, I have noticed that the Node Protection for SR-TE Paths draft has e= xpired several weeks ago. I wonder if the authors plan to refresh it any time soon. Regards, and lots of thanks in advance, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com --_000_HE1PR0301MB226678AAB49427CB775EE4EF9DB90HE1PR0301MB2266_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

 

Regards,

Sasha

 

Office: +972-39266= 302

Cell:   = ;   +972-549266302

Email:   Ale= xander.Vainshtein@ecitele.com

 

From: Alexander Vainshtein
Sent: Monday, November 07, 2016 5:56 PM
To: 'shraddha@juniper.net' <shraddha@juniper.net>; 'cbowers@ju= niper.net' <cbowers@juniper.net>
Cc: 'spring@ietf.com' <spring@ietf.com>
Subject: Node Protection for SR-TE Paths: an expired draft

 

Hi all,

I have noticed that the Node Protection for SR-TE Paths draft has expired several weeks ago.

 

I wonder if the authors plan to refresh it any time = soon.

 

Regards, and lots of thanks in advance,

Sasha

 

Office: +972-39266302

Cell:      +972-5492663= 02

Email:   Alexander.Vainshtein@ecitele.com

 

--_000_HE1PR0301MB226678AAB49427CB775EE4EF9DB90HE1PR0301MB2266_-- From nobody Mon Nov 14 11:09:53 2016 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 EBF93129999 for ; Mon, 14 Nov 2016 11:09:51 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.019 X-Spam-Level: X-Spam-Status: No, score=-16.019 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=-1.497, 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 ILwGXOsmv7o8 for ; Mon, 14 Nov 2016 11:09:50 -0800 (PST) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7BACD1295A5 for ; Mon, 14 Nov 2016 11:09:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=147; q=dns/txt; s=iport; t=1479150590; x=1480360190; h=from:subject:to:message-id:date:mime-version: content-transfer-encoding; bh=JI4B6FwRo/jsyjV81HFiJCmBBoDe8+8lWuZtn5GGvzM=; b=ioskEgPqhqaORGRTkiGycH18lEh7A8hNRSuVF6CE5lOL8/szYn/yPUuU IJscSQgImaDjz5JPdR+5a54gY11UpVJR75FTCMb2xjNq4Q2/hzkwUw/rR jZsnvhHA+99yHI3q/bgkzzPw2cZO8z3kBZN9Pva8+BIexGkJBwyMqcdZx Y=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0B1BACfCypY/xbLJq1eHAEBBAEBCgEBg?= =?us-ascii?q?zEBAQEBAbseggeJCRMBAgEBAQEBAQFiHQuFCw8BBUA2AgUWCwILAwIBAgFLDQg?= =?us-ascii?q?BAYhdn2+PfIIUFYtQAQEIAgEkgQmFM4wmgl0BBJpBkF2BWQGIJYYhiWWHaSADM?= =?us-ascii?q?oEDhTc9iDABAQE?= X-IronPort-AV: E=Sophos;i="5.31,491,1473120000"; d="scan'208";a="647094635" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Nov 2016 19:09:48 +0000 Received: from [10.61.214.246] ([10.61.214.246]) by aer-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id uAEJ9lAd032410 for ; Mon, 14 Nov 2016 19:09:48 GMT From: Clarence Filsfils To: "spring@ietf.org" Message-ID: <582A04CB.3040103@cisco.com> Date: Mon, 14 Nov 2016 19:39:07 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: [spring] draft-ietf-spring-segment-routing-central-epe X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 14 Nov 2016 19:09:52 -0000 Related to draft-ietf-spring-segment-routing-central-epe I’m not aware of any IPR other than the ones already disclosed Cheers, Clarence From nobody Mon Nov 14 11:10:01 2016 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 83B711299A0 for ; Mon, 14 Nov 2016 11:09:52 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.019 X-Spam-Level: X-Spam-Status: No, score=-16.019 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=-1.497, 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 XbHvIpKSxKSH for ; Mon, 14 Nov 2016 11:09:51 -0800 (PST) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 433EE129610 for ; Mon, 14 Nov 2016 11:09:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=140; q=dns/txt; s=iport; t=1479150591; x=1480360191; h=from:subject:to:message-id:date:mime-version: content-transfer-encoding; bh=Jnvp5SqTotjtWkeVELJhoYwVI7DuHC4ilgM6QPptwNM=; b=EIQi0EdpkuO2wODFKpCfEKcLirJqDjfEmrmKltT6ebN6aSxH167BXdTu 8EE86VsfwiQZWHT0zxt8qouICRnxxQFYBcXlCiZzLycEBg8PzrXV3A3LW Umdos+vRRFXqbcgmPigWePpvov1gGUO29GAuSA7nbgXRtLqp3FTqpgvjt U=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0B1BACfCypY/xbLJq1eHAEBBAEBCgEBg?= =?us-ascii?q?zEBAQEBAbseggeJCRMBAgEBAQEBAQFiHQuFCw8BBUA2AgUWCwILAwIBAgFLDQg?= =?us-ascii?q?BAYhdn2+PfIIUFYtQAQEIAgEkgQmFM4wmgl0FmkGQXYFZAYglhiGJZYdpIAMyg?= =?us-ascii?q?QOFNz2IMAEBAQ?= X-IronPort-AV: E=Sophos;i="5.31,491,1473120000"; d="scan'208";a="647094637" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Nov 2016 19:09:49 +0000 Received: from [10.61.214.246] ([10.61.214.246]) by aer-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id uAEJ9m6A023134 for ; Mon, 14 Nov 2016 19:09:49 GMT From: Clarence Filsfils To: "spring@ietf.org" Message-ID: <582A04D9.7070601@cisco.com> Date: Mon, 14 Nov 2016 19:39:21 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: [spring] draft-ietf-spring-segment-routing-msdc X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 14 Nov 2016 19:09:52 -0000 Related to draft-ietf-spring-segment-routing-msdc I’m not aware of any IPR other than the ones already disclosed Cheers, Clarence From nobody Mon Nov 14 11:10:04 2016 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 89C241299B3 for ; Mon, 14 Nov 2016 11:09:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.019 X-Spam-Level: X-Spam-Status: No, score=-16.019 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=-1.497, 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 R8NAJO-QFw8Q for ; Mon, 14 Nov 2016 11:09:52 -0800 (PST) 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 2F3101295A5 for ; Mon, 14 Nov 2016 11:09:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=135; q=dns/txt; s=iport; t=1479150592; x=1480360192; h=from:subject:to:message-id:date:mime-version: content-transfer-encoding; bh=yC2Zfgp+MkixDOSPhRfzLU+BlMBTW2s9YK2f5PHO7zk=; b=RkZtuamw77RrdlRVP4BNDXRpPe2X8NMXd5RAPTer+p7jysa456AS7xbc HvE+e5vwk/XazXgajNZ/8WY0kc8IzvE2aP5q6GN1iHqDwiKM9rAJiFlW/ bW8AU7IQ5dJTH4fKuqy+LP5PM20YK6Vl8d7C6+ROOuKFupKsi0rHsFF8Y g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0B1BADLCipY/xbLJq1eHAEBBAEBCgEBg?= =?us-ascii?q?zEBAQEBAbseggeJCBMBAgEBAQEBAQFiHQuFCw8BBUA2AgUWCwILAwIBAgFLDQg?= =?us-ascii?q?BAYhdn2uPfIIUFYtQAQEIAgEkgQmFM4wmgl0FmkGQXYFZAYglhiGJZYdpIAMyg?= =?us-ascii?q?QOFNz2IMAEBAQ?= X-IronPort-AV: E=Sophos;i="5.31,491,1473120000"; d="scan'208";a="649935800" 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; 14 Nov 2016 19:09:50 +0000 Received: from [10.61.214.246] ([10.61.214.246]) by aer-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id uAEJ9nEV023140 for ; Mon, 14 Nov 2016 19:09:50 GMT From: Clarence Filsfils To: "spring@ietf.org" Message-ID: <582A04EA.8060500@cisco.com> Date: Mon, 14 Nov 2016 19:39:38 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: [spring] draft-ietf-spring-segment-routing X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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DIR:OUT; SFP:1102; SCL:1; SRVR:MWHPR05MB2832; H:MWHPR05MB2829.namprd05.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: juniper.net does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Nov 2016 23:22:01.7337 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR05MB2832 Archived-At: Cc: "spring@ietf.org" , Alexander Vainshtein Subject: Re: [spring] meaning of "Strict Shortest Path" algorithm in draft-ietf-spring-segment-routing-09 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Nov 2016 23:29:10.4011 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR05MB2831 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] clarification of text in draft-ietf-spring-segment-routing-09 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] clarification of text in draft-ietf-spring-segment-routing-09 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Zm8vc3ByaW5nDQo+PiANCj4+IF9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fDQo+PiBzcHJpbmcgbWFpbGluZyBsaXN0DQo+PiBzcHJpbmdAaWV0Zi5vcmcNCj4+ IGh0dHBzOi8vd3d3LmlldGYub3JnL21haWxtYW4vbGlzdGluZm8vc3ByaW5nDQo+IA0KDQo= From nobody Sat Nov 19 09:31:30 2016 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 050171294F6; Sat, 19 Nov 2016 09:31:29 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 6.38.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147957668901.30667.16771377091655351556.idtracker@ietfa.amsl.com> Date: Sat, 19 Nov 2016 09:31:29 -0800 Archived-At: Cc: spring@ietf.org Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-10.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 19 Nov 2016 17:31:29 -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 Architecture Authors : Clarence Filsfils Stefano Previdi Bruno Decraene Stephane Litkowski Rob Shakir Filename : draft-ietf-spring-segment-routing-10.txt Pages : 29 Date : 2016-11-19 Abstract: Segment Routing (SR) leverages the source routing paradigm. A node steers a packet through an ordered list of instructions, called segments. A segment can represent any instruction, topological or service-based. A segment can have a local semantic to an SR node or global within an SR domain. 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. Segment Routing can be directly applied to the MPLS architecture with no change on the forwarding plane. A segment is encoded as an MPLS label. An ordered list of segments is encoded as a stack of labels. The segment to process is on the top of the stack. Upon completion of a segment, the related label is popped from the stack. Segment Routing can be applied to the IPv6 architecture, with a new type of routing header. A segment is encoded as an IPv6 address. An ordered list of segments is encoded as an ordered list of IPv6 addresses in the routing header. The active segment is indicated by the Destination Address of the packet. The next active segment is indicated by a pointer in the new routing header. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing/ There's also a htmlized version available at: https://tools.ietf.org/html/draft-ietf-spring-segment-routing-10 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-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 Nov 21 00:01:30 2016 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 4C5DF1293D6; Mon, 21 Nov 2016 00:01:29 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 6.38.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147971528930.28737.7008788120758085667.idtracker@ietfa.amsl.com> Date: Mon, 21 Nov 2016 00:01:29 -0800 Archived-At: Cc: spring@ietf.org Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-central-epe-03.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Nov 2016 08:01:29 -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 Centralized BGP Peer Engineering Authors : Clarence Filsfils Stefano Previdi Ebben Aries Dmitry Afanasiev Filename : draft-ietf-spring-segment-routing-central-epe-03.txt Pages : 19 Date : 2016-11-20 Abstract: Segment Routing (SR) leverages source routing. A 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 of the SR domain. The Segment Routing architecture can be directly applied to the MPLS dataplane with no change on the forwarding plane. It requires minor extension to the existing link-state routing protocols. This document illustrates the application of Segment Routing to solve the BGP Peer Engineering (BGP-PE) requirement. The SR-based BGP-PE solution allows a centralized (SDN) controller to program any egress peer policy at ingress border routers or at hosts within the domain. This document is on the informational track. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-central-epe/ There's also a htmlized version available at: https://tools.ietf.org/html/draft-ietf-spring-segment-routing-central-epe-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-central-epe-03 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 Nov 21 00:08:30 2016 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 A9F691297C5 for ; Mon, 21 Nov 2016 00:08:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.019 X-Spam-Level: X-Spam-Status: No, score=-16.019 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=-1.497, 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 SvfXgcPoedfW for ; Mon, 21 Nov 2016 00:08:28 -0800 (PST) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8E32F1294F1 for ; Mon, 21 Nov 2016 00:08:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=798; q=dns/txt; s=iport; t=1479715708; x=1480925308; h=from:to:subject:date:message-id:content-id: content-transfer-encoding:mime-version; bh=14gbdowg9nUkdFcIpd+24qXiMfwADuYS52MVKoTt9Kc=; b=RE3H+WxClqbW16skGabYJuUit77GU93a5GlqPZ+TeyDz+RDkQcY5tNDw cK+Yo42olHsV+cHiKFfh0zfj8rbJykfi5KpH6JT+t5stso/pPY5D5gWKM p143gTfRVrshU/vEXXXjJVzl4BSTLyJnaHkDW4C2VpC1BGn259NHXsdZC 8=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AXAgBJqzJY/5hdJa1dHAEBBAEBCgEBg?= =?us-ascii?q?zgBAQEBAR+BX404q3+BUzKGPYFsPxQBAgEBAQEBAQFiKIRvIxFAFwEiAiYCBDA?= =?us-ascii?q?VEgSJAJkAj3yCKYtNAQEBAQEFAQEBAQEBASCBCYUzgX0IhnARAYMgLYIwBZpNA?= =?us-ascii?q?ZB2gVoWhHeDP4YBkWkBHjdeNB6FI4cBgSGBDAEBAQ?= X-IronPort-AV: E=Sophos;i="5.31,674,1473120000"; d="scan'208";a="177325258" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Nov 2016 08:08:06 +0000 Received: from XCH-RTP-007.cisco.com (xch-rtp-007.cisco.com [64.101.220.147]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id uAL886V9030644 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL) for ; Mon, 21 Nov 2016 08:08:06 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; Mon, 21 Nov 2016 03:08:05 -0500 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, 21 Nov 2016 03:08:05 -0500 From: "Stefano Previdi (sprevidi)" To: SPRING WG Thread-Topic: authors, please read Thread-Index: AQHSQ85jaAEK1VQH8ki16zsEoJ+tkQ== Date: Mon, 21 Nov 2016 08:08:05 +0000 Message-ID: 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: [10.61.196.177] Content-Type: text/plain; charset="utf-8" Content-ID: <2CF36E500D47204AA7C4478824550897@emea.cisco.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: [spring] authors, please read X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Nov 2016 14:24:10 -0000 Related to draft-ietf-spring-ipv6-use-cases I’m not aware of any IPR related to this draft Cheers, Clarence From John_Leddy@comcast.com Mon Nov 21 15:06:44 2016 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 046771293E4 for ; Mon, 21 Nov 2016 15:06:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.397 X-Spam-Level: X-Spam-Status: No, score=-3.397 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-1.497, 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 A1i1O-snYJHK for ; Mon, 21 Nov 2016 15:06:43 -0800 (PST) Received: from vaadcmhout02.cable.comcast.com (vaadcmhout02.cable.comcast.com [96.114.28.76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F24571294D2 for ; Mon, 21 Nov 2016 15:06:42 -0800 (PST) X-AuditID: 60721c4c-dafff70000001e60-90-58337dfa075f Received: from VAADCEX47.cable.comcast.com (vaadcmhoutvip.cable.comcast.com [96.115.73.56]) (using TLS with cipher AES256-SHA256 (256/256 bits)) (Client did not present a certificate) by (SMTP Gateway) with SMTP id F2.E7.07776.AFD73385; Mon, 21 Nov 2016 18:06:37 -0500 (EST) Received: from VAADCEX41.cable.comcast.com (147.191.103.218) by VAADCEX47.cable.comcast.com (147.191.103.224) with Microsoft SMTP Server (TLS) id 15.0.1130.7; Mon, 21 Nov 2016 18:06:33 -0500 Received: from VAADCEX41.cable.comcast.com ([fe80::3aea:a7ff:fe12:e268]) by VAADCEX41.cable.comcast.com ([fe80::3aea:a7ff:fe12:e268%19]) with mapi id 15.00.1130.005; Mon, 21 Nov 2016 18:06:33 -0500 From: "Leddy, John" To: "spring@ietf.org" Thread-Topic: IPR draft-ietf-spring-ipv6-use-cases Thread-Index: AQHSREvnGWlVQQbkPEuSpLrpTk+Uhw== Date: Mon, 21 Nov 2016 23:06:33 +0000 Message-ID: <16EFEFE3-5C45-4A33-BF8F-0CAC07224677@cable.comcast.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/f.1c.1.161117 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [68.87.29.8] Content-Type: multipart/alternative; boundary="_000_16EFEFE35C454A33BF8F0CAC07224677cablecomcastcom_" MIME-Version: 1.0 X-CFilter-Loop: Forward X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrKIsWRmVeSWpSXmKPExsWSUOxpofu/1jjCYNpSS4vjF34zOjB6LFny kymAMYrLJiU1J7MstUjfLoEro2XeW5aCfZIVP6avYmxgvCzRxcjJISFgInGouY+xi5GLQ0hg JpPEs/9zWCGcQ4wSvd0XWUCqhAROMkr0LMoGsdkEdCRmTLsGVMTBISKgLvHsaDiIKSygKzF3 SjJIhYiAkcTJ06eZIGw9iXft/8GmsAioSvzZc58VxOYVcJHYd2MCWJxRQEzi+6k1YPXMAuIS t57MZ4K4TUBiyZ7zzBC2qMTLx//AekWBZu7+0cUKEdeROHv9CSOEbSCxdek+FghbTqJnRysj xMx0if6df5gh9gpKnJz5BKpGXOLwkR2sExjFZiFZPQtJyywkLbOAvmQW0JRYv0sfokRRYkr3 Q3YIW0Oidc5cKNtB4nLzfUZkNQsYOVYxypUlJqYk52bkl5YYGOklJyblpOol5+cmJxaXgOhN jKDILJLx2cH4aZrHIUYBDkYlHt71xcYRQqyJZcWVucD44GBWEuGdmQsU4k1JrKxKLcqPLyrN SS0+xCjNwaIkzrv9pmaEkEB6YklqdmpqQWoRTJaJg1OqgfHAy4x5ups/7HR7tW715wcre29l PVCKcjfe3/vztGiMvkhiSkFOxlFZlYUsFnFlymf4dFhkn+9bPDk48MNrPbvr210/3MhJbdk3 e0NOxt+lD99oXi+PitqWNI+Nc617wemby+z0Z52580L34JrVsnVZp48svmYXGpFqPV3a+Ffn pu7ivokmvXpKLMUZiYZazEXFiQC8ulLmyAIAAA== Archived-At: X-Mailman-Approved-At: Wed, 23 Nov 2016 06:24:53 -0800 Subject: [spring] IPR draft-ietf-spring-ipv6-use-cases X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Thu, 24 Nov 2016 12:21:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1480018897; bh=mGYTghBPZRBl7anGsyx9y2CIzBICmW+pO8H2UOmpsws=; h=Date:From:Reply-To:To:Subject:References:From:Subject; b=YcDxmHcZ8lVyAFmU3u3l441Gi89kfrtM6p/DhW0oM8LbYC6ZXqiocJuWgyQPgyaMIBfNW9GKTixlV3SfvHvRWVG/sPYnkswaWZWg8xNoRbTPmlQxmYgHv4bKztJd7WH88mJjXfT4IRyxueGme7yGvLf9Vj4YjXy8neQsYF+0HcyIcAg2Nq8hgdS8xZ7CFbNbTVsqj1NbRMIsU9Lm9cpHAIHZU4wWwj9qZtSdwgRqMrPIunG95t1FgUljDJwXF/KjZhGtaul3ksvnXKxV93/AfyOeUgzA/YnNAWbfOz+WLVzyICP5BBCV8qbRUXhjOcrUN5UwFVwmxdytfoMnhEV+mQ== Received: from [127.0.0.1] by nm32.bullet.mail.ne1.yahoo.com with NNFMP; 24 Nov 2016 20:21:37 -0000 Received: from [98.138.100.113] by nm32.bullet.mail.ne1.yahoo.com with NNFMP; 24 Nov 2016 20:18:36 -0000 Received: from [98.138.226.162] by tm104.bullet.mail.ne1.yahoo.com with NNFMP; 24 Nov 2016 20:18:36 -0000 Received: from [127.0.0.1] by omp1063.mail.ne1.yahoo.com with NNFMP; 24 Nov 2016 20:18:36 -0000 X-Yahoo-Newman-Property: ymail-4 X-Yahoo-Newman-Id: 275877.20740.bm@omp1063.mail.ne1.yahoo.com X-YMail-OSG: kBqCA7sVM1kUoCdohhnkQUeuJc_95n8B2HWN_5rSFTl0T6QxITQrtgDjTJcXf0p R0jpDh1Wzjbh.IxVMCqdVLzhYZnDcF7qON7BuQLSqzv94_cF.bpPAvKAg7Eciz8voU7Z4vidxiiI HMpvTXVA0G7_ZpryZmzHxYb5YdOkchqYCCsx3q6rLjA9rrTXZbxWGqUUlUljV0WO1.HdtqDgMlEy wMgucCA6G7fwF8AQ3Z3FgGGzFo8RgkTzFJp7ELUd7P.koRUqSGNwxrYbNgPkt5B0nNjPpKzrhGl0 C_AKFMLvuMEWdoLR4H7due5COiax9ko8Ls7.Um5hfB0HFUyWKCerC6dVDuzbVoYmsGp3.dRdX5HV 0tQYunhoEUGmge31FI4q5PUDktsRn2ySpwfpL3TG4oloVKGnWheF7V6Ce4bSBglMHBf7cYaaHQDP ACM7QfLUaCC2qqiF2ZUMUy1w1vV629nzPpoMtIiUT4I298YczxuA0aN0zpAGq0PG0WWIFVszNIQU tMC6hbCTFIt4CBR2dmZgE1WwIkzIkhVlIPQ-- Received: from jws200134.mail.ne1.yahoo.com by sendmailws133.mail.ne1.yahoo.com; Thu, 24 Nov 2016 20:18:35 +0000; 1480018715.905 Date: Thu, 24 Nov 2016 20:18:35 +0000 (UTC) From: "slin100@yahoo.com" To: "spring@ietf.org" Message-ID: <1393640944.36575.1480018715668@mail.yahoo.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_36574_678998384.1480018715667" References: <1393640944.36575.1480018715668.ref@mail.yahoo.com> Archived-At: Subject: [spring] draft-filsfils-spring-large-scale-interconnect-02.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: "slin100@yahoo.com" List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Nov 2016 21:13:21 -0000 ------=_Part_36574_678998384.1480018715667 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable I am not aware of any IPR related to this draft.=C2=A0--=C2=A0Steven Lin ------=_Part_36574_678998384.1480018715667 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit
I am not aware of any IPR related to this draft.
 
-- 
Steven Lin
------=_Part_36574_678998384.1480018715667-- From nobody Mon Nov 28 01:39:00 2016 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 B60E31297EF for ; Mon, 28 Nov 2016 01:38:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.902 X-Spam-Level: X-Spam-Status: No, score=-6.902 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H2=-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 cnwqvZKOW0i2 for ; Mon, 28 Nov 2016 01:38:57 -0800 (PST) Received: from smtp-fr.alcatel-lucent.com (fr-hpida-esg-02.alcatel-lucent.com [135.245.210.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D106F129847 for ; Mon, 28 Nov 2016 01:38:56 -0800 (PST) Received: from fr712umx3.dmz.alcatel-lucent.com (unknown [135.245.210.42]) by Websense Email Security Gateway with ESMTPS id 82990A3083450 for ; Mon, 28 Nov 2016 09:38:52 +0000 (GMT) Received: from fr711usmtp1.zeu.alcatel-lucent.com (fr711usmtp1.zeu.alcatel-lucent.com [135.239.2.122]) by fr712umx3.dmz.alcatel-lucent.com (GMO-o) with ESMTP id uAS9cq13026720 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 28 Nov 2016 09:38:54 GMT Received: from FR711WXCHHUB02.zeu.alcatel-lucent.com (fr711wxchhub02.zeu.alcatel-lucent.com [135.239.2.112]) by fr711usmtp1.zeu.alcatel-lucent.com (GMO) with ESMTP id uAS9cmsd005429 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Mon, 28 Nov 2016 09:38:51 GMT Received: from [135.224.203.51] (135.239.27.38) by FR711WXCHHUB02.zeu.alcatel-lucent.com (135.239.2.112) with Microsoft SMTP Server (TLS) id 14.3.301.0; Mon, 28 Nov 2016 10:37:35 +0100 From: Martin Vigoureux To: Message-ID: Date: Mon, 28 Nov 2016 10:37:34 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [135.239.27.38] Archived-At: Subject: [spring] WG LC for draft-ietf-spring-segment-routing X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 28 Nov 2016 09:38:59 -0000 Hello WG, this e-mail initiates a two-week WG LC for draft-ietf-spring-segment-routing [1]. All authors have already replied to the IPR poll. There is known IPR [2] on this document. Please read the latest version of the document and state whether or not you support the submission of this document to the IESG as a Proposed Standard. Please also express the comments you would have on this latest version. Your involvement in this step is very important so please take the time to read and express your opinions on the list. Thank you M&B [1] https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing/ [2] https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-ietf-spring-segment-routing From nobody Mon Nov 28 06:26:23 2016 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 4A1AD1295D5 for ; Mon, 28 Nov 2016 06:26:21 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.902 X-Spam-Level: X-Spam-Status: No, score=-1.902 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-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 cr4N0IwnW-Q1 for ; Mon, 28 Nov 2016 06:26:19 -0800 (PST) Received: from mail1.bemta12.messagelabs.com (mail1.bemta12.messagelabs.com [216.82.251.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B03071295AD for ; Mon, 28 Nov 2016 06:26:19 -0800 (PST) Received: from [216.82.250.51] by server-11.bemta-12.messagelabs.com id 76/81-22879-B8E3C385; Mon, 28 Nov 2016 14:26:19 +0000 X-Env-Sender: Dave.Cooper@Level3.com X-Msg-Ref: server-8.tower-108.messagelabs.com!1480343178!83995753!1 X-Originating-IP: [209.245.18.37] X-StarScan-Received: X-StarScan-Version: 9.0.16; banners=-,-,- X-VirusChecked: Checked Received: (qmail 8097 invoked from network); 28 Nov 2016 14:26:19 -0000 Received: from bge23000.messagelabs1.prod.broomfield1.level3.net (HELO messagelabs1.level3.com) (209.245.18.37) by server-8.tower-108.messagelabs.com with DHE-RSA-AES256-SHA encrypted SMTP; 28 Nov 2016 14:26:19 -0000 Received: from USIDCWVEHT01.corp.global.level3.com (usidcwveht01.corp.global.level3.com [10.1.142.31]) (using TLSv1 with cipher DES-CBC3-SHA (168/168 bits)) (Client CN "USIDCWVEHT01", Issuer "USIDCWVEHT01" (not verified)) by messagelabs1.level3.com (Postfix) with ESMTPS id 73B991DECD for ; Mon, 28 Nov 2016 14:26:18 +0000 (GMT) Received: from USIDCWVEMBX06.corp.global.level3.com ([fe80::3dcb:3c86:a83:a947]) by USIDCWVEHT01.corp.global.level3.com ([::1]) with mapi id 14.03.0319.002; Mon, 28 Nov 2016 07:26:17 -0700 From: "Cooper, Dave" To: "spring@ietf.org" Thread-Topic: IPR draft-filsfils-spring-large-scale-interconnect Thread-Index: AdJJgz6+BizKD/9IQ2GA9iQWBbFiEw== Date: Mon, 28 Nov 2016 14:26:16 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.1.196.205] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: [spring] IPR draft-filsfils-spring-large-scale-interconnect X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 28 Nov 2016 14:26:21 -0000 I am not aware of any IPR related to draft-filsfils-spring-scale-interconne= ct From nobody Tue Nov 29 11:22:17 2016 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 7FE81129BF1; Tue, 29 Nov 2016 11:22:16 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.69 X-Spam-Level: X-Spam-Status: No, score=-2.69 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, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01] 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 IttM3-J2jzHj; Tue, 29 Nov 2016 11:22:10 -0800 (PST) Received: from mail-wm0-x22b.google.com (mail-wm0-x22b.google.com [IPv6:2a00:1450:400c:c09::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 8AAFE1295F8; Tue, 29 Nov 2016 11:22:06 -0800 (PST) Received: by mail-wm0-x22b.google.com with SMTP id f82so198504582wmf.1; Tue, 29 Nov 2016 11:22:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:subject:message-id:date:user-agent:mime-version :content-transfer-encoding; bh=ZkLLpJlREsYPy3aIHCcfkA80NN/IAH5ILOCxZ2P3CvI=; b=vd/EDdbSPYqpnf7i4L0IBo4lrLO5FtczzueMuDh/5lzfu3r4LL9mtQuif6vMvbZ5gE QAp3nMHwWUKFHfyA0ah0z2PAySfvqXwOvhvuTFZhTArMCH+wPRnnWnTvmKxvVe0aXYDX atuckyZ/DC3mp9AY1oWBYicb3SgyDBWQx2iCE5O6SrKcHyE9jNPPwK559mtHs6Cdl9/d 6k0bdbjMA0b8vP4UCnKhMa4MTSn60nqQoWlZXbGmYq/zUoVGd0aimCx+cnFe3P1ijfex 2HbJwHVJ6OLtF3UBmEwL8t9Iz2U225clVpTxN/f0qANbIn1nbhURL9z0u9MSB2eFQ3eF W66g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:message-id:date:user-agent :mime-version:content-transfer-encoding; bh=ZkLLpJlREsYPy3aIHCcfkA80NN/IAH5ILOCxZ2P3CvI=; b=SSKMFGk/qsSIazgTnIWIgW1BfsvuBV/PWhIeCgl7LwRFt9O23sa0zYxkKeFkV0/eZC 4+o0ECHZivUrs+Q1sn5f3bckam3G7mBdJmN81NjeTDKOvawuis6o2yJkT1zadR3LLMSO f66fmp5WbD9PHAgZfgLReHrvnF9ShExA5b59MAderbZYdHUG92x7E1tTgsYybS4GQEmK y55ogEJDCLTevRxnv0Vv/WCziEalGj+83DWimqgtLPjfcJS6ZiGKNjWztMorBqrxM12S DRPFK11XHNSl6L96TJaqqg0nbjgS6atcIgppJrM41UVXLVFLomKdmIsHfU/RwWYcn2CP Fb6g== X-Gm-Message-State: AKaTC03B1c1jk4dhOrO1QZ0TjjIpz5A47YOLulMEYOReJZwmJMdpLRF/2Ou5zshIFcKpfA== X-Received: by 10.28.131.72 with SMTP id f69mr23942060wmd.135.1480447321869; Tue, 29 Nov 2016 11:22:01 -0800 (PST) Received: from [192.168.2.131] (host213-123-124-182.in-addr.btopenworld.com. [213.123.124.182]) by smtp.gmail.com with ESMTPSA id gk6sm51479435wjc.46.2016.11.29.11.22.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 Nov 2016 11:22:01 -0800 (PST) From: Stewart Bryant To: draft-ietf-spring-segment-routing@ietf.org, spring@ietf.org, spring-chairs@tools.ietf.org Message-ID: <9c309847-d267-6397-274d-ec387b7332e1@gmail.com> Date: Tue, 29 Nov 2016 19:21:59 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.5.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: [spring] WG LC for draft-ietf-spring-segment-routing X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 29 Nov 2016 19:22:16 -0000 The following are my comments on this text in response to the WGLC. A lot of comments are embedded in the draft text below. However I have some major overarching comments. Although this is called an architecture it seems to be rather more of a description of how a large number of other documents combine to produce an overall specification for SR. Certainly for an architecture the number of forward references to detailed solutions for a description of the concept is quite extraordinary. So embedded is the contents of some of these referenced documents that I do not think that it safe to publish this text other than synchronously with some of those documents. This is absolutely the case for the dataplane definitions, especially for IPv6, but seems likely to apply to other references. The further implication of the constant dependence on other documents is that many of them are really normative rather than informative references, making this document a hostage to their fate. It is far more conventional in an architecture to set out the general description and state the invariants, and put the detail into specific protocol documents, but to have the architecture as a standalone text. In other words to set things out so that the reader understands how components fit together, what the subtleties are and what the constraints on the components are, but leave the component design decisions to the component designers. Clearly I think this draft needs significant work before it is ready for submission to the IESG for publication. - Stewart Network Working Group C. Filsfils, Ed. Internet-Draft S. Previdi, Ed. Intended status: Standards Track Cisco Systems, Inc. Expires: May 23, 2017 B. Decraene S. Litkowski Orange R. Shakir Google November 19, 2016 Segment Routing Architecture draft-ietf-spring-segment-routing-10 Abstract Segment Routing (SR) leverages the source routing paradigm. A node steers a packet through an ordered list of instructions, called segments. A segment can represent any instruction, topological or service-based. A segment can have a local semantic to an SR node or global within an SR domain. 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. SB> Since you mention service chains here, we really should be having SB> a wider discussion about whether SR and SFC are really the same SB> technology. Segment Routing can be directly applied to the MPLS architecture with no change on the forwarding plane. SB> Applied to or implemented using MPLS? A segment is encoded as an MPLS label. An ordered list of segments is encoded as a stack of labels. The segment to process is on the top of the stack. Upon completion of a segment, the related label is popped from the stack. Segment Routing can be applied to the IPv6 architecture, with a new type of routing header. A segment is encoded as an IPv6 address. An ordered list of segments is encoded as an ordered list of IPv6 addresses in the routing header. The active segment is indicated by the Destination Address of the packet. The next active segment is indicated by a pointer in the new routing header. SB> You really cannot say this until the v6 design goes to RFC, although SB> I do not see why this needs to be stated. SB> What I did not see in here is a proper comparision of the consequences SB> of the stack vs list and pointer approach. The consequences of the SB> difefrence between these two approaches may be far reaching in the long SB> term and lead to biforcation of the architecture, something we should SB> think about carefully up front. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Filsfils, et al. Expires May 23, 2017 [Page 1] Internet-Draft Segment Routing November 2016 Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on May 23, 2017. Copyright Notice Copyright (c) 2016 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Companion Documents . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Link-State IGP Segments . . . . . . . . . . . . . . . . . . . 7 3.1. IGP Segment, IGP SID . . . . . . . . . . . . . . . . . . 7 3.2. IGP-Prefix Segment, Prefix-SID . . . . . . . . . . . . . 7 3.2.1. Prefix-SID Algorithm . . . . . . . . . . . . . . . . 7 3.2.2. MPLS Dataplane . . . . . . . . . . . . . . . . . . . 9 3.2.3. IPv6 Dataplane . . . . . . . . . . . . . . . . . . . 10 3.3. IGP-Node Segment, Node-SID . . . . . . . . . . . . . . . 10 3.4. IGP-Anycast Segment, Anycast SID . . . . . . . . . . . . 11 3.5. IGP-Adjacency Segment, Adj-SID . . . . . . . . . . . . . 14 3.5.1. Parallel Adjacencies . . . . . . . . . . . . . . . . 15 3.5.2. LAN Adjacency Segments . . . . . . . . . . . . . . . 16 3.6. Binding Segment . . . . . . . . . . . . . . . . . . . . . 16 3.6.1. Mapping Server . . . . . . . . . . . . . . . . . . . 16 3.6.2. Tunnel Headend . . . . . . . . . . . . . . . . . . . 17 3.7. Inter-Area Considerations . . . . . . . . . . . . . . . . 17 4. BGP Peering Segments . . . . . . . . . . . . . . . . . . . . 18 Filsfils, et al. Expires May 23, 2017 [Page 2] Internet-Draft Segment Routing November 2016 5. IGP Mirroring Context Segment . . . . . . . . . . . . . . . 19 6. Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19 8. Security Considerations . . . . . . . . . . . . . . . . . . . 19 8.1. MPLS Data Plane . . . . . . . . . . . . . . . . . . . . . 20 8.2. IPv6 Data Plane . . . . . . . . . . . . . . . . . . . . . 21 9. Manageability Considerations . . . . . . . . . . . . . . . . 22 10. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 24 11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 24 12. References . . . . . . . . . . . . . . . . . . . . . . . . . 25 12.1. Normative References . . . . . . . . . . . . . . . . . . 25 12.2. Informative References . . . . . . . . . . . . . . . . . 25 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 29 1. Introduction With Segment Routing (SR), a node steers a packet through an ordered list of instructions, called segments. A segment can represent any instruction, topological or service-based. A segment can have a SB> It really is a pity that we did not use the more descriptive term instructions SB> which would have help people understand what they are. I wonder if it is SB> too late to change? SB> Service based what? local semantic to an SR node or global within an SR domain. SR allows to enforce a flow through any path and service chain while maintaining per-flow state only at the ingress node of the SR domain. SB> I wonder if we should be pulling together SR and SFC into SB> a common architecture, since they seem to have converged? Segment Routing can be directly applied to the MPLS architecture ([RFC3031]) with no change on the forwarding plane. A segment is encoded as an MPLS label. An ordered list of segments is encoded as a stack of labels. The active segment is on the top of the stack. A completed segment is popped off the stack. The addition of a segment is performed with a push. SB> All true, but we are designing a solution for both MPLS and IP. SB> Shouldn't this text be establishing the architectural princples SB> first before getting down in the weeds of the MPLS solution? SB> SB> IP and MPLS took different approaches so at this level we need to SB> be discussing the principles, and establish the properties of SB> the list, which again are radically different, and then let the SB> solutions drafts describe the instantiation of the list. In the Segment Routing MPLS instantiation, a segment could be of several types: o an IGP segment, o a BGP Peering segments, o an LDP LSP segment, o an RSVP-TE LSP segment, o a BGP LSP segment. SB> All true, but right down in the weeds. What about the functional SB> equivalents in IP? The first two (IGP and BGP Peering segments) types of segments are defined in this document. The use of the last three types of segments is illustrated in [I-D.ietf-spring-segment-routing-mpls]. Filsfils, et al. Expires May 23, 2017 [Page 3] Internet-Draft Segment Routing November 2016 Segment Routing can be applied to the IPv6 architecture ([RFC2460]), with a new type of routing header. A segment is encoded as an IPv6 address. An ordered list of segments is encoded as an ordered list of IPv6 addresses in the routing header. The active segment is indicated by the Destination Address of the packet. Upon completion of a segment, a pointer in the new routing header is incremented and indicates the next segment. SB> Again this is down in the weeds considering that we are in an architecture SB> document and also proposes the detail of a solution that may or may SB> not be finalized. Numerous use-cases illustrate the benefits of source routing either for FRR, OAM or Traffic Engineering reasons. SB> This needs a reference. This document defines a set of instructions (called segments) that are required to fulfill the described use-cases. These segments can either be used in isolation (one single segment defines the source route of the packet) or in combination (these segments are part of an ordered list of segments that define the source route of the packet). 1.1. Companion Documents This document defines the SR architecture, its routing model, the IGP-based segments, the BGP-based segments and the service segments. Use cases are described in [RFC7855], [I-D.ietf-spring-segment-routing-central-epe], [I-D.ietf-spring-segment-routing-msdc], [I-D.filsfils-spring-large-scale-interconnect], [I-D.ietf-spring-ipv6-use-cases], [I-D.ietf-spring-resiliency-use-cases], [I-D.ietf-spring-oam-usecase] and [I-D.ietf-spring-sr-oam-requirement]. SB> It would be helpful to the reader to indicate the contents, so that SB> if this just becomes a set of RFC numbers they had some better its SB> what the documents are about. SB> SB> It would also be useful to get an understanding from the AD SB> as to which of the use case documents will be published, merged SB> become part of a wiki etc given recent policy statements from the IESG. Segment Routing for MPLS dataplane is documented in [I-D.ietf-spring-segment-routing-mpls]. Segment Routing for IPv6 dataplane is documented in [I-D.ietf-6man-segment-routing-header]. IGP protocol extensions for Segment Routing are described in [I-D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-extensions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions] referred in this document as "IGP SR extensions documents". The FRR solution for SR is documented in [I-D.francois-rtgwg-segment-routing-ti-lfa]. The PCEP protocol extensions for Segment Routing are defined in [I-D.ietf-pce-segment-routing]. Filsfils, et al. Expires May 23, 2017 [Page 4] Internet-Draft Segment Routing November 2016 The interaction between SR/MPLS with other MPLS Signaling planes is documented in [I-D.ietf-spring-segment-routing-ldp-interop]. 2. Terminology Segment: an instruction a node executes on the incoming packet (e.g.: forward packet according to shortest path to destination, or, forward packet through a specific interface, or, deliver the packet to a given application/service instance). SID: a Segment Identifier. Examples of SIDs are: a MPLS label, an index value in a MPLS label space, an IPv6 address. Other types of SIDs can be defined in the future. SB> Definition by example is not a definition. Segment List: ordered list of SID's encoding the topological and service source route of the packet. SB> Isn't it an ordered list of SID encoding the ordered set of SB> instructions to be applies to the packet as it traverses the SB> SR domain? It is a stack of labels in the MPLS architecture. It is an ordered list of IPv6 addresses in the IPv6 architecture. SB> Again this a architecture it should not go down in those weeds. Segment Routing Domain (SR Domain): the set of nodes participating into the source based routing model. SB> Surely is is the set of nodes that form an SR Instance having a SB> common view of the mapping of SID to instruction definition These nodes may be connected to the same physical infrastructure (e.g.: a Service Provider's network) as well as nodes remotely connected to each other (e.g.: an enterprise VPN or an overlay). Note that a SR domain may also be confined within an IGP instance, in which case it is named SR-IGP Domain. Active segment: the segment that MUST be used by the receiving router to process the packet. In the MPLS dataplane is the top label. In the IPv6 dataplane is the destination address of a packet having the Segment Routing Header as defined in [I-D.ietf-6man-segment-routing-header]. SB> I am surprised that you don't need to define POP or Remove PUSH: the insertion of a segment at the head of the Segment list. SB> This works for a stack model, but I am not sure it works for SB> a list model where you really do an insert. NEXT: the active segment is completed, the next segment becomes active. CONTINUE: the active segment is not completed and hence remains active. The CONTINUE instruction is implemented as the SWAP instruction in the MPLS dataplane. In IPv6, this is the plain IPv6 forwarding action of a regular IPv6 packet according to its Destination Address. SB> Again I worry about definition by example. SR Global Block (SRGB): local property of an SR node. In the MPLS architecture, SRGB is the set of local labels reserved for global segments. Using the same SRGB on all nodes within the SR domain ease operations and troubleshooting and is expected to be a deployment Filsfils, et al. Expires May 23, 2017 [Page 5] Internet-Draft Segment Routing November 2016 guideline. In the IPv6 architecture, the equivalent of the SRGB is in fact the set of addresses used as global segments. Since there are no restrictions on which IPv6 address can be used, the concept of the SRGB includes all IPv6 global address space used within the SR domain. SB> I worry about whether this is an architectural concept of a SB> specific dataplane concept, or an implementation concept. Since SB> the IPv6 design moved from a set of short instructions to full SB> IPv6 addresses, this does not look like an architectural construct. Global Segment: the related instruction is supported by all the SR- capable nodes in the domain. SB> instruction or identifier. Isn't the point about this that any node SB> knows how to execute its view of the instruction, and indeed SB> it is possible that the mapping at some nodes (for example forward) SB> may be different from the mapping at another node (for example SB> receive, or deliver to attached firewall) In the MPLS architecture, a Global Segment has a globally-unique index. The related local label at a given node N is found by adding the globally-unique index to the SRGB of node N. In the IPv6 architecture, a global segment is a globally- unique IPv6 address. SB> Again this muddles architecture and mapping to an instantiation SB> of that architecture. SB> nit s/has a globally-unique/ is a globally-unique/ SB> However this begs the question of the scope of global. Certainly SB> in MPLS it is restricted to the SR-Domain, and even then it may SB> only be a sub-set of it. Local Segment: the related instruction is supported only by the node originating it. SB> Again I think it is the mapping of the instruction identifier to SB> the instruction rather than the instruction. In the MPLS architecture, this is a local label outside the SRGB. In the IPv6 architecture, this can be any IPv6 address whose reachability is not advertised in any routing protocol (hence, the segment is known only by the local node). SB> Wait a moment the instruction is understood by the imposing node(s) SB> and the executing node IGP Segment: the generic name for a segment attached to a piece of information advertised by a link-state IGP, e.g. an IGP prefix or an IGP adjacency. SB> I don't think it's a name. Isn't it simply a segment that is advertised SB> by an IGP? Of course that takes us back to the scoping definition, since SB> all nodes receive the IGP information. IGP-prefix Segment, Prefix-SID: an IGP-Prefix Segment is an IGP segment attached to an IGP prefix. SB> What does attached mean here? An IGP-Prefix Segment is global (unless explicitly advertised otherwise) within the SR IGP instance/ topology and identifies an instruction to forward the packet along the path computed using the routing algorithm specified in the algorithm field, in the topology and the IGP instance where it is advertised. SB> More precisely isn't it an instruction to forward a packet SB> along the path computed for a specified prefix? The Prefix-SID is the SID of the IGP-Prefix Segment. SB> I think that this should be a separate definition. IGP-Anycast: an IGP-Anycast Segment is an IGP-prefix segment which does not identify a specific router, but a set of routers. The terms "Anycast Segment" or "Anycast-SID" are often used as an abbreviation. IGP-Adjacency: an IGP-Adjacency Segment is an IGP segment attached to an unidirectional adjacency or a set of unidirectional adjacencies. By default, an IGP-Adjacency Segment is local (unless explicitly advertised otherwise) to the node that advertises it. SB> What are the semantics of a non local adjacency segment? IGP-Node: an IGP-Node Segment is an IGP-Prefix Segment which identifies a specific router (e.g. a loopback). The terms "Node Segment" or Node-SID" are often used as an abbreviation. SR Tunnel: a list of segments to be pushed on the packets directed on the tunnel. The list of segments can be specified explicitly or implicitly via a set of abstract constraints (latency, affinity, SRLG, ...). In the latter case, a constraint-based path computation Filsfils, et al. Expires May 23, 2017 [Page 6] Internet-Draft Segment Routing November 2016 is used to determine the list of segments associated with the tunnel. The computation can be local or delegated to a PCE server. An SR tunnel can be configured by the operator, provisioned via netconf or provisioned via PCEP. An SR tunnel can be used for traffic- engineering, OAM or FRR reasons. SB> So where does tunnel fit into that definition? Isn't the point SB> about a tunnel that it is a type of virtual link that constrains SB> a packet to a path other than the natural path that would be SB> inferred from its native address? Segment List Depth: the number of segments of an SR tunnel. The entity instantiating an SR Tunnel at a node N should be able to discover the depth insertion capability of the node N. The PCEP discovery capability is described in [I-D.ietf-pce-segment-routing]. SB> Isn't that just one way that such a size might be discovered? 3. Link-State IGP Segments Within a link-state IGP domain, an SR-capable IGP node advertises segments for its attached prefixes and adjacencies. These segments are called IGP segments or IGP SIDs. They play a key role in Segment Routing and use-cases as they enable the expression of any topological path throughout the IGP domain. Such a topological path is either expressed as a single IGP segment or a list of multiple IGP segments. SB> I am not sure that topological path is a well known term. A quick check SB> in google only found the term is one paper. Do you simply mean path? 3.1. IGP Segment, IGP SID The terms "IGP Segment" and "IGP SID" are the generic names for a segment attached to a piece of information advertised by a link-state IGP, e.g. an IGP prefix or an IGP adjacency. 3.2. IGP-Prefix Segment, Prefix-SID An IGP-Prefix Segment is an IGP segment attached to an IGP prefix. An IGP-Prefix Segment is global (unless explicitly advertised otherwise) within the SR/IGP domain. The required IGP protocol extensions are defined in IGP SR extensions documents. 3.2.1. Prefix-SID Algorithm The IGP protocol extensions for Segment Routing define the Prefix-SID advertisement which includes a set of flags and the algorithm field. The algorithm field has the purpose of associating a given Prefix-SID to a routing algorithm. In the context of an instance and a topology, multiple Prefix-SID's MAY be allocated to the same IGP Prefix as long as the algorithm value is different in each one. Filsfils, et al. Expires May 23, 2017 [Page 7] Internet-Draft Segment Routing November 2016 Multiple instances and topologies are defined in IS-IS and OSPF in: [RFC5120], [RFC6822], [RFC6549] and [RFC4915]. Initially, two "algorithms" have been defined: o "Shortest Path": this algorithm is the default behavior. The packet is forwarded along the well known ECMP-aware SPF algorithm however it is explicitly allowed for a midpoint to implement another forwarding based on local policy.. The "Shortest Path" algorithm is in fact the default and current behavior of most of the networks where local policies may override the SPF decision. SB> If a node is going to apply local policy, doesn't there need to be a SB> comment about loop avoidance, and also possibly cleaning up the SB> SR header if local policy is to send the packet out of the domain? SB> I worry about what this means when this is applied to a SID SB> other than the final SID specifying the path. o "Strict Shortest Path": This algorithm mandates that the packet is forwarded according to ECMP-aware SPF algorithm and instruct any router in the path to ignore any possible local policy overriding SPF decision. The SID advertised with "Strict Shortest Path" algorithm ensures that the path the packet is going to take is the expected, and not altered, SPF path. An IGP-Prefix Segment identifies the path, to the related prefix, along the path computed as per the algorithm field. A packet injected anywhere within the SR/IGP domain with an active Prefix-SID will be forwarded along path computed by the algorithm expressed in the algorithm field. The ingress node of an SR domain validates that the path to a prefix, advertised with a given algorithm, includes nodes all supporting the advertised algorithm. As a consequence, if a node on the path does not support algorithm X, the IGP-Prefix segment will be interrupted and will drop packet on that node. It's the responsibility of the ingress node using a segment to check that all downstream nodes support the algorithm of the segment. A router MUST NOT forward any SR traffic associated with the SR algorithm to the adjacent router, if the adjacent router has not advertised support for such SR algorithm. It has to be noted that Fast Reroute (FRR) mechanisms, such as the one described in [I-D.francois-rtgwg-segment-routing-ti-lfa], that are based on post-convergence SPF, are still compliant to the Strict- SPF algorithm definition. Details of the two defined algorithms are defined in [I-D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-extensions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions]. SB> I am not convinced that the statements on IPFRR belong in the SB> architecture, surely they belong in the IPFRR document together SB> a declaration of architectural conformance? Filsfils, et al. Expires May 23, 2017 [Page 8] Internet-Draft Segment Routing November 2016 3.2.2. MPLS Dataplane SB> I am not convinced that this is architecture, more implementation SB> in a specific dataplane. It is not particularly critical in the case of SB> MPLS as we pretty much know what it looks like. I remain to be convinced SB> about IP. The problem is that if the dataplane design changes, it may SB> invalidate the architecture. Best practise is to be invariant to the SB> implementation when there are multiple possible data planes. When SR is used over the MPLS dataplane: o the IGP signaling extension for IGP-Prefix segment includes the P-Flag ([I-D.ietf-isis-segment-routing-extensions]) or the NP-Flag ([I-D.ietf-ospf-segment-routing-extensions]). A Node N advertising a Prefix-SID SID-R for its attached prefix R unset 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. SB> That is really down in the weeds, and I am not sure it belongs here. SB> surely you need to specify the requirement on the solution, not the SB> solution itself in this document. Alternatively, if it does belong here SB> it needs a more complete description here. o A Prefix-SID is allocated in the form of an index in the SRGB (or as a local MPLS label) according to a process similar to IP address allocation. Typically the Prefix-SID is allocated by policy by the operator (or NMS) and the SID very rarely changes. o While SR allows to attach a local segment to an IGP prefix (using the L-Flag), SB> what is an L-flag? we specifically assume that when the terms "IGP- Prefix Segment" and "Prefix-SID" are used, the segment is global (the SID is allocated from the SRGB or as an index). This is consistent with all the described use-cases that require global segments attached to IGP prefixes. o The allocation process MUST NOT allocate the same Prefix-SID to different IP prefixes. o If a node learns a Prefix-SID having a value that falls outside the locally configured SRGB range, then the node MUST NOT use the Prefix-SID and SHOULD issue an error log warning for misconfiguration. o If a node N advertises Prefix-SID SID-R for a prefix R that is attached to N, N MUST either clear the P-Flag in the advertisement of SID-R, or else maintain the following FIB entry: SB> Where did the P-Flag come from? Incoming Active Segment: SID-R Ingress Operation: NEXT Egress interface: NULL o A remote node M MUST maintain the following FIB entry for any learned Prefix-SID SID-R attached to IP prefix R: Filsfils, et al. Expires May 23, 2017 [Page 9] Internet-Draft Segment Routing November 2016 Incoming Active Segment: SID-R Ingress Operation: If the next-hop of R is the originator of R and instructed to remove the active segment: NEXT Else: CONTINUE Egress interface: the interface towards the next-hop along the path computed using the algorithm advertised with the SID toward prefix R. SB> This is quite confusing. Don't these sorts of operations apply to other sorts of SB> SID, such as nodal SIDs? Why are these called out in detail but not others? SB> You talk about ECMP in nodal, doesn't that also apply here? 3.2.3. IPv6 Dataplane When SR is used over the IPv6 dataplane: o The Prefix-SID is the prefix itself. No additional identifier is needed for Segment Routing over IPv6. o Any address belonging to any of the node's prefixes can be used as Prefix-SIDs. o An operator may want to explicitly indicate which of the node's prefixes can be used as Prefix-SIDs through the setting of a flag (e.g.: using the IGP prefix attribute defined in [RFC7794]) in the routing protocol used for advertising the prefix. o A global SID is instantiated through any globally advertised IPv6 address. o A local SID is instantiated through a local IPv6 prefix not being advertised and therefore known only by the local node. A node N advertising an IPv6 address R usable as a segment identifier MUST maintain the following FIB entry: Incoming Active Segment: R Ingress Operation: NEXT Egress interface: NULL Regardless Segment Routing, any remote IPv6 node will maintain a plain IPv6 FIB entry for any prefix, no matter if they represent a segment or not. 3.3. IGP-Node Segment, Node-SID An IGP Node Segment is a an IGP Prefix Segment which identifies a specific router (e.g. a loopback). The terms "Node Segment" or "Node-SID" are often used as an abbreviation. The IGP SR extensions define a flag that identifies Node-SIDs. Filsfils, et al. Expires May 23, 2017 [Page 10] Internet-Draft Segment Routing November 2016 A "Node Segment" or "Node-SID" is fundamental to SR. From anywhere in the network, it enforces the ECMP-aware shortest-path forwarding of the packet towards the related node. An IGP Node-SID MUST NOT be associated with a prefix that is owned by more than one router within the same routing domain. 3.4. IGP-Anycast Segment, Anycast SID An IGP-Anycast Segment is an IGP-prefix segment which does not identify a specific router, but a set of routers. The terms "Anycast Segment" or "Anycast-SID" are often used as an abbreviation. An "Anycast Segment" or "Anycast SID" enforces the ECMP-aware shortest-path forwarding towards the closest node of the anycast set. This is useful to express macro-engineering policies or protection mechanisms. An IGP-Anycast Segment MUST NOT reference a particular node. Within an anycast group, all routers MUST advertise the same prefix with the same SID value. Filsfils, et al. Expires May 23, 2017 [Page 11] Internet-Draft Segment Routing November 2016 +--------------+ | Group A | |192.0.2.10/32 | | SID:100 | | | +-----------A1---A3----------+ | | | \ / | | | SID:10 | | | / | | | SID:30 203.0.113.1/32 | | | / \ | | | 203.0.113.3/32 PE1------R1----------A2---A4---------R3------PE3 \ /| | | |\ / \ / | +--------------+ | \ / \ / | | \ / / | | / / \ | | / \ / \ | +--------------+ | / \ / \| | | |/ \ PE2------R2----------B1---B3----+----R4------PE4 203.0.113.2/32 | | | \ / | | | 203.0.113.4/32 SID:20 | | | / | | | SID:40 | | | / \ | | | +-----+-----B2---B4----+-----+ | | | Group B | | 192.0.2.1/32 | | SID:200 | +--------------+ Transit device groups The figure above describes a network example with two groups of transit devices. Group A consists of devices {A1, A2, A3 and A4}. They are all provisioned with the anycast address 192.0.2.10/32 and the anycast SID 100. Similarly, group B consists of devices {B1, B2, B3 and B4} and are all provisioned with the anycast address 192.0.2.1/32, anycast SID 200. In the above network topology, each PE device is connected to two routers in each of the groups A and B. PE1 can choose a particular transit device group when sending traffic to PE3 or PE4. This will be done by pushing the anycast SID of the group in the stack. Processing the anycast, and subsequent segments, requires special care. Filsfils, et al. Expires May 23, 2017 [Page 12] Internet-Draft Segment Routing November 2016 Obviously, the value of the SID following the anycast SID MUST be understood by all nodes advertising the same anycast segment. +-------------------------+ | Group A | | 192.0.2.10/32 | | SID:100 | |-------------------------| | | | SRGB: SRGB: | SID:10 |(1000-2000) (3000-4000)| SID:30 PE1---+ +-------A1-------------A3-------+ +---PE3 \ / | | \ / | | \ / \ / | | +-----+ / | | \ / SRGB: \ / | | \ / | | \ / SRGB: (7000-8000) R1 | | \ | | R3 (6000-7000) / \ | | / \ | | / \ / \ | | +-----+ \ | | / \ / \ | | / \ | | / \ PE2---+ +-------A2-------------A4-------+ +---PE4 SID:20 | SRGB: SRGB: | SID:40 |(2000-3000) (4000-5000)| | | +-------------------------+ Transit paths via anycast group A Considering a MPLS deployment, in the above topology, if device PE1 (or PE2) requires to send a packet to the device PE3 (or PE4) it needs to encapsulate the packet in a MPLS payload with the following stack of labels. SB> AS an MPLS payload? o Label allocated by R1 for anycast SID 100 (outer label). o Label allocated by the nearest router in group A for SID 30 (for destination PE3). While the first label is easy to compute, in this case since there are more than one topologically nearest devices (A1 and A2), unless A1 and A2 allocated the same label value to the same prefix, determining the second label is impossible. Devices A1 and A2 may be devices from different hardware vendors. If both don't allocate the same label value for SID 30, it is impossible to use the anycast group "A" as a transit anycast group towards PE3. Hence, PE1 (or PE2) cannot compute an appropriate label stack to steer the packet exclusively through the group A devices. Same holds true for devices PE3 and PE4 when trying to send a packet to PE1 or PE2. Filsfils, et al. Expires May 23, 2017 [Page 13] Internet-Draft Segment Routing November 2016 To ease the use of anycast segment in a short term, it is recommended to configure the same SRGB on all nodes of a particular anycast group. Using this method, as mentioned above, computation of the label following the anycast segment is straightforward. Using anycast segment without configuring the same SRGB on nodes belonging to the same device group may lead to misrouting (in a MPLS VPN deployment, some traffic may leak between VPNs). SB> So is this an architectural statement that mixed vendor anycast SB> does not work? In which case I wonder if it should be in the SB> architecture at all. 3.5. IGP-Adjacency Segment, Adj-SID An IGP-Adjacency Segment is an IGP segment attached to a unidirectional adjacency or a set of unidirectional adjacencies. By default, an IGP-Adjacency Segment is local to the node which advertises it. However, an Adjacency Segment can be global if advertised by the IGP as such. The SID of the IGP-Adjacency Segment is called the Adj-SID. SB> I think that there is some confusion about the meaning of global SB> in this draft. Earlier on the term implied that global meant that SB> any node would know how to execute the instruction, here it SB> seems to imply that it is global if the value is known globally. The adjacency is formed by the local node (i.e., the node advertising the adjacency in the IGP) and the remote node (i.e., the other end of the adjacency). The local node MUST be an IGP node. The remote node MAY be an adjacent IGP neighbor or a non-adjacent neighbor (e.g.: a Forwarding Adjacency, [RFC4206]). SB> Aren't Adjacency segments a concept in their own right with the SB> IGP just being one way of learning them? In which case shouldn't they SB> be introduced and explored in their own right first? A packet injected anywhere within the SR domain with a segment list {SN, SNL}, where SN is the Node-SID of node N and SNL is an Adj-SID attached by node N to its adjacency over link L, will be forwarded along the shortest-path to N and then be switched by N, without any IP shortest-path consideration, towards link L. If the Adj-SID identifies a set of adjacencies, then the node N load- balances the traffic among the various members of the set. Similarly, when using a global Adj-SID, a packet injected anywhere within the SR domain with a segment list {SNL}, where SNL is a global Adj-SID attached by node N to its adjacency over link L, will be forwarded along the shortest-path to N and then be switched by N, without any IP shortest-path consideration, towards link L. SB> Ah, I think some clarification is needed earlier in the text. SB> You have two types of ADJ-SID, the original one which was SB> a local label attached to a node so it only had meaning in SB> conjunction with the node identifier, and this new one which SB> is a full identity in it's own right. I think that needs to be SB> more clearly expressed, together with some discussion on scaling. SB> SB> This causes me to wonder why there is no overall discussion on the SB> scaling properties and issues, since that is very much an SB> an architectural concern. If the Adj-SID identifies a set of adjacencies, then the node N load- balances the traffic among the various members of the set. The use of global Adj-SID allows to reduce the size of the segment list when expressing a path at the cost of additional state (i.e.: the global Adj-SID will be inserted by all routers within the area in their forwarding table). SB> Doesn't it also use labels from the global label table which SB> is itself of a limited size? An "IGP Adjacency Segment" or "Adj-SID" enforces the switching of the packet from a node towards a defined interface or set of interfaces. This is key to theoretically prove that any path can be expressed as a list of segments. SB> This is surely a fundamental point that should be earlier in the SB> discussion. Filsfils, et al. Expires May 23, 2017 [Page 14] Internet-Draft Segment Routing November 2016 The encodings of the Adj-SID include the B-flag. When set, the Adj- SID refers to an adjacency that is eligible for protection (e.g.: using IPFRR or MPLS-FRR). SB> Where did the B-flag come from? The encodings of the Adj-SID include the L-flag. When set, the Adj- SID has local significance. By default the L-flag is set. A node SHOULD allocate one Adj-SIDs for each of its adjacencies. SB> This needs further discussion - for example why .. and is this SB> local or global? A node MAY allocate multiple Adj-SIDs to the same adjacency. An example is where the adjacency is established over a bundle interface. Each bundle member MAY have its own Adj-SID. A node MAY allocate the same Adj-SID to multiple adjacencies. SB> I am wondering is Adj is the right term here. In routing SB> an adjacency is a neighbouring node, but I think we are SB> actually talking here about Link-SIDs and Link-Bundle SIDs. Adjacency suppression MUST NOT be performed by the IGP. SB> Why/why not? A node MUST install a FIB entry for any Adj-SID of value V attached to data-link L: Incoming Active Segment: V Operation: NEXT Egress Interface: L The Adj-SID implies, from the router advertising it, the forwarding of the packet through the adjacency identified by the Adj-SID, regardless its IGP/SPF cost. In other words, the use of Adjacency Segments overrides the routing decision made by SPF algorithm. SB> nit: by the SPF 3.5.1. Parallel Adjacencies Adj-SIDs can be used in order to represent a set of parallel interfaces between two adjacent routers. SB> So we need to be clearer that an Adj-SID can be a Link, a Link Bundle or a link Group. A node MUST install a FIB entry for any locally originated Adjacency Segment (Adj-SID) of value W attached to a set of link B with: Incoming Active Segment: W Ingress Operation: NEXT Egress interface: loadbalance between any data-link within set B When parallel adjacencies are used and associated to the same Adj- SID, and in order to optimize the load balancing function, a "weight" factor can be associated to the Adj-SID advertised with each adjacency. The weight tells the ingress (or a SDN/orchestration system) about the loadbalancing factor over the parallel adjacencies. As shown in Figure 1, A and B are connected through two parallel adjacencies Filsfils, et al. Expires May 23, 2017 [Page 15] Internet-Draft Segment Routing November 2016 link-1 +--------+ | | S---A B---C | | +--------+ link-2 Figure 1: Parallel Links and Adj-SIDs Node A advertises following Adj-SIDs and weights: o Link-1: Adj-SID 1000, weight: 1 o Link-2: Adj-SID 1000, weight: 2 Node S receives the advertisements of the parallel adjacencies and understands that by using Adj-SID 1000 node A will loadbalance the traffic across the parallel links (link-1 and link-2) according to a 1:2 ratio. SB> What happens about flow order when you use this construct? The weight value is advertised with the Adj-SID as defined in IGP SR extensions documents. 3.5.2. LAN Adjacency Segments In LAN subnetworks, link-state protocols define the concept of Designated Router (DR, in OSPF) or Designated Intermediate System (DIS, in IS-IS) that conduct flooding in broadcast subnetworks and that describe the LAN topology in a special routing update (OSPF Type2 LSA or IS-IS Pseudonode LSP). The difficulty with LANs is that each router only advertises its connectivity to the DR/DIS and not to each other individual nodes in the LAN. Therefore, additional protocol mechanisms (IS-IS and OSPF) are necessary in order for each router in the LAN to advertise an Adj-SID associated to each neighbor in the LAN. These extensions are defined in IGP SR extensions documents. SB> This should really be in the form "will need to be provided" 3.6. Binding Segment SB> I have read this section several times, and it is really not clear. SB> Nor is it clear that this is part of SR as opposed to a general SB> MPLS feature. 3.6.1. Mapping Server A Remote-Binding SID S advertised by the mapping server M for remote prefix R attached to non-SR-capable node N signals the same information as if N had advertised S as a Prefix-SID. Further details are described in the SR/LDP interworking procedures ([I-D.ietf-spring-segment-routing-ldp-interop]. Filsfils, et al. Expires May 23, 2017 [Page 16] Internet-Draft Segment Routing November 2016 The segment allocation and SRGB Maintenance rules are the same as those defined for Prefix-SID. 3.6.2. Tunnel Headend The segment allocation and SRGB Maintenance rules are the same as those defined for Adj-SID. A tunnel attached to a head-end H acts as an adjacency attached to H. Note: an alternative consists of representing tunnels as forwarding- adjacencies ( [RFC4206]). In such case, the tunnel is presented to the routing area as a routing adjacency and is considered as such by all area routers. The Remote-Binding SID is preferred as it allows to advertise the presence of a tunnel without influencing the LSDB and the SPF computation. 3.7. Inter-Area Considerations In the following example diagram we assume an IGP deployed using areas and where SR has been deployed. ! ! ! ! B------C-----F----G-----K / | | | S---A/ | | | \ | | | \D------I----------J-----L----Z (192.0.2.1/32, Node-SID: 150) ! ! Area-1 ! Backbone ! Area 2 ! area ! Figure 2: Inter-Area Topology Example In area 2, node Z allocates Node-SID 150 to his local prefix 192.0.2.1/32. ABRs G and J will propagate the prefix into the backbone area by creating a new instance of the prefix according to normal inter-area/level IGP propagation rules. Nodes C and I will apply the same behavior when leaking prefixes from the backbone area down to area 1. Therefore, node S will see prefix 192.0.2.1/32 with Prefix-SID 150 and advertised by nodes C and I. It therefore results that a Prefix-SID remains attached to its related IGP Prefix through the inter-area process. When node S sends traffic to 192.0.2.1/32, it pushes Node-SID(150) as active segment and forward it to A. Filsfils, et al. Expires May 23, 2017 [Page 17] Internet-Draft Segment Routing November 2016 When packet arrives at ABR I (or C), the ABR forwards the packet according to the active segment (Node-SID(150)). Forwarding continues across area borders, using the same Node-SID(150), until the packet reaches its destination. When an ABR propagates a prefix from one area to another it MUST set the R-Flag. SB> As far as I can see these flags are not properly defined in this architecture document. SB> What is really needed is a section on routing protocol indicators. 4. BGP Peering Segments In the context of BGP Egress Peer Engineering (EPE), as described in [I-D.ietf-spring-segment-routing-central-epe], an EPE enabled Egress PE node MAY advertise segments corresponding to its attached peers. These segments are called BGP peering segments or BGP Peering SIDs. They enable the expression of source-routed inter-domain paths. An ingress border router of an AS may compose a list of segments to steer a flow along a selected path within the AS, towards a selected egress border router C of the AS and through a specific peer. At minimum, a BGP Peering Engineering policy applied at an ingress PE involves two segments: the Node SID of the chosen egress PE and then the BGP Peering Segment for the chosen egress PE peer or peering interface. Hereafter, we will define three types of BGP peering segments/SID's: PeerNodeSID, PeerAdjSID and PeerSetSID. o PeerNode SID. A BGP PeerNode segment/SID is a local segment. At the BGP node advertising it, its semantics is: * SR header operation: NEXT. * Next-Hop: the connected peering node to which the segment is related. o PeerAdj SID: A BGP PeerAdj segment/SID is a local segment. At the BGP node advertising it, its semantics is: * SR header operation: NEXT. * Next-Hop: the peer connected through the interface to which the segment is related. o PeerSet SID. A BGP PeerSet segment/SID is a local segment. At the BGP node advertising it, its semantics is: * SR header operation: NEXT. Filsfils, et al. Expires May 23, 2017 [Page 18] Internet-Draft Segment Routing November 2016 * Next-Hop: loadbalance across any connected interface to any peer in the related group. A peer set could be all the connected peers from the same AS or a subset of these. A group could also span across AS. The group definition is a policy set by the operator. The BGP extensions necessary in order to signal these BGP peering segments will be defined in a separate document. 5. IGP Mirroring Context Segment It is beneficial for an IGP node to be able to advertise its ability to process traffic originally destined to another IGP node, called the Mirrored node and identified by an IP address or a Node-SID, provided that a "Mirroring Context" segment be inserted in the segment list prior to any service segment local to the mirrored node. When a given node B wants to provide egress node A protection, it advertises a segment identifying node's A context. Such segment is called "Mirror Context Segment" and identified by the Mirror SID. The Mirror SID is advertised using the Binding Segment defined in SR IGP protocol extensions ( [I-D.ietf-isis-segment-routing-extensions], [I-D.ietf-ospf-segment-routing-extensions] and [I-D.ietf-ospf-ospfv3-segment-routing-extensions]). In the event of a failure, a point of local repair (PLR) diverting traffic from A to B does a PUSH of the Mirror SID on the protected traffic. B, when receiving the traffic with the Mirror SID as the active segment, uses that segment and process underlying segments in the context of A. 6. Multicast Segment Routing is defined for unicast. The application of the source-route concept to Multicast is not in the scope of this document. SB> A reference to BIER might be apropriate since that is the SB> conceptually similar. 7. IANA Considerations This document does not require any action from IANA. 8. Security Considerations Segment Routing is applicable to both MPLS and IPv6 data planes. SB> Isn't it applicable to any forwarding plane in which an ordered SB> list of instructions can be imposed on a packet, at least from SB> an architectural perspective. Filsfils, et al. Expires May 23, 2017 [Page 19] Internet-Draft Segment Routing November 2016 Segment Routing adds some meta-data on the packet, with the list of forwarding path elements (e.g.: nodes, links, services, etc.) that the packet must traverse. SB> Earlier they were instructions, or segments, and it was an ordered list. SB> I am trying to figure out if you traverse a service. Either way SB> I am struck by the difference between the description here and at SB> the front of the document. It has to be noted that the complete source routed path may be represented by a single segment. This is the case of the Binding SID. SB> I am not sure what that adds. The important point is to consider the SB> vulnerabilities and it is not clear whether BS is an increased vulnerability SB> if not it is unclear what it adds to the analysis. 8.1. MPLS Data Plane When applied to the MPLS data plane, Segment Routing does not introduce any new behavior or any change in the way MPLS data plane works. Therefore, from a security standpoint, this document does not define any additional mechanism in the MPLS data plane. SB> Well not quite. One characteristic of MPLS was that the behaviour SB> of a label was only known to its peers. If a packet mislanded at SB> a node the behaviour was thus completely unpredictable and thus SB> had to exploit. MPLS-SR reduces that unpredictability and thus SB> add potential exploits that do not exist in the original MPLS design. SR allows the expression of a source routed path using a single segment (the Binding SID). Compared to RSVP-TE which also provides explicit routing capability, there are no fundamental differences in term of information provided. Both RSVP-TE and Segment Routing may express a source routed path using a single segment. When a path is expressed using a single label, the syntax of the meta-data is equivalent between RSVP-TE and SR. SB> One of the differences is that RSVP actively maintains the path. SB> Is there a danger of stale paths being left in an SR network SB> and subsequently exploited? When a source routed path is expressed with a list of segments additional meta-data is added to the packet consisting of the source routed path the packet must follow expressed as a segment list. When a path is expressed using a label stack, if one has access to the meaning (i.e.: the Forwarding Equivalence Class) of the labels, one has the knowledge of the explicit path. For the MPLS data plane, as no data plane modification is required, there is no fundamental change of capability. Yet, the occurrence of label stacking will increase. SB> The difference is that an actor could construct an explicit path SB> in a way that was not possible in regular MPLS. In both cases SB> they need to get the packet inside the network, but once inside the SB> network they could construct various types of amplification attack SB> that are not possible in classic MPLS From a network protection standpoint, there is an assumed trust model such that any node imposing a label stack on a packet is assumed to be allowed to do so. This is a significant change compared to plain IP offering shortest path routing but not fundamentally different compared to existing techniques providing explicit routing capability such as RSVP-TE. By default, the explicit routing information MUST NOT be leaked through the boundaries of the administered domain. Segment Routing extensions that have been defined in various protocols, leverage the security mechanisms of these protocols such as encryption, authentication, filtering, etc. In the general case, a segment routing capable router accepts and install labels, only if these labels have been previously advertised by a trusted source. The received information is validated using existing control plane protocols providing authentication and Filsfils, et al. Expires May 23, 2017 [Page 20] Internet-Draft Segment Routing November 2016 security mechanisms. Segment routing does not define any additional security mechanism in existing control plane protocols. Segment Routing does not introduce signaling between the source and the mid points of a source routed path. With SR, the source routed path is computed using SIDs previously advertised in the IP control plane. Therefore, in addition to filtering and controlled advertisement of SIDs at the boundaries of the SR domain, filtering in the data plane is also required. Filtering MUST be performed on the forwarding plane at the boundaries of the SR domain and may require looking at multiple labels/instruction. For the MPLS data plane, there are no new requirement as the existing MPLS architecture already allow such source routing by stacking multiple labels. SB> I think the concern is whether SR make it easier to construct an attack SB> given how widely know the labels are in the network compared to SB> classic MPLS? And for security protection, [RFC4381] section 2.4 and [RFC5920] section 8.2 already calls for the filtering of MPLS packets on trust boundaries. 8.2. IPv6 Data Plane When applied to the IPv6 data plane, Segment Routing does introduce the Segment Routing Header (SRH, [I-D.ietf-6man-segment-routing-header]) which is a type of Routing Extension header as defined in [RFC2460]. The SRH adds some meta-data on the IPv6 packet, with the list of forwarding path elements (e.g.: nodes, links, services, etc.) that the packet must traverse and that are represented by IPv6 addresses. A complete source routed path may be encoded in the packet using a single segment (single IPv6 address). From a network protection standpoint, there is an assumed trust model such that any node adding an SRH to the packet is assumed to be allowed to do so. SB> As I understand it there is current debate as to whether adding SB> a header to a packet is allowed in the IPv6 architecture. Therefore, by default, the explicit routing information MUST NOT be leaked through the boundaries of the administered domain. Segment Routing extensions that have been defined in various protocols, leverage the security mechanisms of these protocols such as encryption, authentication, filtering, etc. SB> The worry of course is that the information is so widely known SB> in the network that any rogue node can leak this. In the general case, an SR IPv6 router accepts and install segments identifiers (in the form of IPv6 addresses), only if these SIDs are advertised by a trusted source. The received information is validated using existing control plane protocols providing authentication and security mechanisms. Segment routing does not define any additional security mechanism in existing control plane protocols. Filsfils, et al. Expires May 23, 2017 [Page 21] Internet-Draft Segment Routing November 2016 In addition, SR domain boundary routers, by default, MUST apply data plane filters so to only accept packets whose DA and SRH (if any) contain addresses previously advertised as SIDs. SB> I am wondering how deep the dpi needs to be here? Also don't you need SB> to forbid any packet with an SRH from entering the network? There are a number of security concerns with source routing at the IPv6 data plane [RFC5095]. The new IPv6-based segment routing header defined in [I-D.ietf-6man-segment-routing-header] and its associated security measures address these concerns. SB> You can only really say that when that draft is an RFC. The IPv6 Segment Routing Header is defined in a way that blind attacks are never possible, i.e., attackers will be unable to send source routed packets that get successfully processed, without being part of the negations for setting up the source routes or being able to eavesdrop legitimate source routed packets. In some networks this base level security may be complemented with other mechanisms, such as packet filtering, cryptographic security, etc. SB> I am surprised that there are no dataplane invariant aspects to SB> the security, and that there are no separate control plane discussion, SB> particularly as you are introducing a new control plane to MPLS. 9. Manageability Considerations In SR enabled networks, the path the packet takes is encoded in the header. As the path is not signaled through a protocol, SB> Is this true for Binding SID? OAM mechanisms are necessary in order for the network operator to validate the effectiveness of a path as well as to check and monitor its liveness and performance. However, it has to be noted that SR allows to reduce substantially the number of states in transit nodes and hence the number of elements that a transit node has to manage is smaller. SR OAM use cases and requirements for the MPLS data plane are defined in [I-D.ietf-spring-oam-usecase] and [I-D.ietf-spring-sr-oam-requirement]. OAM procedures for the MPLS data plane are defined in [I-D.ietf-mpls-spring-lsp-ping]. SR routers receive advertisement of SIDs (index, label or IPv6 address) from the different routing protocols being extended for SR. Each of these protocols have monitoring and troubleshooting mechanisms so to provide operation and management functions for IP addresses that MUST be extended in order to include troubleshooting and monitoring functions of the SID. SR architecture introduces the usage of global segments. Each global segment must be bound to a globally-unique index or address. The management of the allocation of such index or address by the operator is critical for the network behavior to avoid situations like mis- routing. In addition to the allocation policy/tooling that the operator will have in place, an implementation SHOULD protect the network in case of conflict detection by providing a deterministic resolution approach. Filsfils, et al. Expires May 23, 2017 [Page 22] Internet-Draft Segment Routing November 2016 An operator may implement tools in order to audit the network and ensure the good allocation of indexes, SIDs or IP addresses. Conflict detection between SIDs, including Mapping Server binding SIDs, and their resolution are addressed in [I-D.ietf-spring-conflict-resolution]. SR with the MPLS data plane, can be gracefully introduced in an existing LDP [RFC5036] network. This is described in [I-D.ietf-spring-segment-routing-ldp-interop]. SR and LDP may also inter-work. In this case, the introduction of mapping-server may introduce some additional manageability considerations that are discussed in [I-D.ietf-spring-segment-routing-ldp-interop]. When a path is expressed using a a label stack, the occurrence of label stacking will increase. A node may want to signal in the control plane it's ability in terms of size of the label stack it can support. A YANG data model [RFC6020] for segment routing configuration and operations has been defined in [I-D.ietf-spring-sr-yang]. When Segment Routing is applied to the IPv6 data plane, segments are identified through IPv6 addresses. The allocation, management and troubleshooting of segment identifiers is no different than the existing mechanisms applied to the allocation and management of IPv6 addresses. In the SR over IPv6 data plane context, the allocation of SIDs results into the allocation of IPv6 addresses. Therefore, management, troubleshooting, monitoring functions are the same as the one used for IPv6 addresses. The control of a source routed path of an IPv6 packet having an SRH SHOULD be implemented through the inspection of the packet header and more precisely its DA and segment list (in the SRH). The DA of the packet gives the active segment address. The segment list in the SRH gives the entire path of the packet. The validation of the source routed path is done through inspection of DA and SRH present in the packet header matched to the equivalent routing table entries. In the context of SR over the IPv6 data plane, the source routed path is encoded in the SRH as described in [I-D.ietf-6man-segment-routing-header]. The SR IPv6 source routed path is instantiated into the SRH as a list of IPv6 address where the active segment is in the Destination Address (DA) field of the IPv6 packet header. Typically, by inspecting in any node the packet header, it is possible to derive the source routed path it belongs to. Similar to the context of SR over MPLS data plane, an Filsfils, et al. Expires May 23, 2017 [Page 23] Internet-Draft Segment Routing November 2016 implementation may originate path control and monitoring packets where the source routed path is inserted in the SRH and where each segment of the path inserts in the packet the relevant data in order to measure the end to end path and performance. 10. Contributors The following people have substantially contributed to the definition of the Segment Routing architecture and to the editing of this document: Ahmed Bashandy Cisco Systems, Inc. Email: bashandy@cisco.com Martin Horneffer Deutsche Telekom Email: Martin.Horneffer@telekom.de Wim Henderickx Alcatel-Lucent Email: wim.henderickx@alcatel-lucent.com Jeff Tantsura Ericsson Email: Jeff.Tantsura@ericsson.com Edward Crabbe Individual Email: edward.crabbe@gmail.com Igor Milojevic Email: milojevicigor@gmail.com Saku Ytti TDC Email: saku@ytti.fi 11. Acknowledgements We would like to thank Dave Ward, Dan Frost, Stewart Bryant, Pierre Francois, Thomas Telkamp, Les Ginsberg, Ruediger Geib, Hannes Gredler, Pushpasis Sarkar, Eric Rosen and Chris Bowers for their comments and review of this document. Filsfils, et al. Expires May 23, 2017 [Page 24] Internet-Draft Segment Routing November 2016 12. References 12.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC2460] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) Specification", RFC 2460, DOI 10.17487/RFC2460, December 1998, . [RFC3031] Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol Label Switching Architecture", RFC 3031, DOI 10.17487/RFC3031, January 2001, . [RFC4206] Kompella, K. and Y. Rekhter, "Label Switched Paths (LSP) Hierarchy with Generalized Multi-Protocol Label Switching (GMPLS) Traffic Engineering (TE)", RFC 4206, DOI 10.17487/RFC4206, October 2005, . 12.2. Informative References SB> It is unclear to me whether or not many of these references are truely SB> informative. It seems that in many cases the architectural description SB> is so scant that the reader cannot fully understand elements of the SB> the architecture without reading some of these references, and that SB> makes them normative. [I-D.filsfils-spring-large-scale-interconnect] Filsfils, C., Cai, D., Previdi, S., Henderickx, W., Cooper, D., Ferguson, F., Laberge, T., Lin, S., Decraene, B., Jalil, L., jefftant@gmail.com, j., and R. Shakir, "Interconnecting Millions Of Endpoints With Segment Routing", draft-filsfils-spring-large-scale- interconnect-04 (work in progress), October 2016. [I-D.francois-rtgwg-segment-routing-ti-lfa] Francois, P., Bashandy, A., and C. Filsfils, "Abstract", draft-francois-rtgwg-segment-routing-ti-lfa-02 (work in progress), November 2016. [I-D.ietf-6man-segment-routing-header] Previdi, S., Filsfils, C., Field, B., Leung, I., Linkova, J., Aries, E., Kosugi, T., Vyncke, E., and D. Lebrun, "IPv6 Segment Routing Header (SRH)", draft-ietf-6man- segment-routing-header-02 (work in progress), September 2016. Filsfils, et al. Expires May 23, 2017 [Page 25] Internet-Draft Segment Routing November 2016 [I-D.ietf-isis-segment-routing-extensions] Previdi, S., Filsfils, C., Bashandy, A., Gredler, H., Litkowski, S., Decraene, B., and j. jefftant@gmail.com, "IS-IS Extensions for Segment Routing", draft-ietf-isis- segment-routing-extensions-09 (work in progress), October 2016. [I-D.ietf-mpls-spring-lsp-ping] Kumar, N., Swallow, G., Pignataro, C., Akiya, N., Kini, S., Gredler, H., and M. Chen, "Label Switched Path (LSP) Ping/Trace for Segment Routing Networks Using MPLS Dataplane", draft-ietf-mpls-spring-lsp-ping-01 (work in progress), October 2016. [I-D.ietf-ospf-ospfv3-segment-routing-extensions] Psenak, P., Previdi, S., Filsfils, C., Gredler, H., Shakir, R., Henderickx, W., and J. Tantsura, "OSPFv3 Extensions for Segment Routing", draft-ietf-ospf-ospfv3- segment-routing-extensions-07 (work in progress), October 2016. [I-D.ietf-ospf-segment-routing-extensions] Psenak, P., Previdi, S., Filsfils, C., Gredler, H., Shakir, R., Henderickx, W., and J. Tantsura, "OSPF Extensions for Segment Routing", draft-ietf-ospf-segment- routing-extensions-10 (work in progress), October 2016. [I-D.ietf-pce-segment-routing] Sivabalan, S., Medved, J., Filsfils, C., Crabbe, E., Raszuk, R., Lopez, V., Tantsura, J., Henderickx, W., and J. Hardwick, "PCEP Extensions for Segment Routing", draft- ietf-pce-segment-routing-08 (work in progress), October 2016. [I-D.ietf-spring-conflict-resolution] Ginsberg, L., Psenak, P., Previdi, S., and M. Pilka, "Segment Routing Conflict Resolution", draft-ietf-spring- conflict-resolution-02 (work in progress), October 2016. [I-D.ietf-spring-ipv6-use-cases] Brzozowski, J., Leddy, J., Townsley, W., Filsfils, C., and R. Maglione, "IPv6 SPRING Use Cases", draft-ietf-spring- ipv6-use-cases-07 (work in progress), July 2016. Filsfils, et al. Expires May 23, 2017 [Page 26] Internet-Draft Segment Routing November 2016 [I-D.ietf-spring-oam-usecase] Geib, R., Filsfils, C., Pignataro, C., and N. Kumar, "A Scalable and Topology-Aware MPLS Dataplane Monitoring System", draft-ietf-spring-oam-usecase-04 (work in progress), October 2016. [I-D.ietf-spring-resiliency-use-cases] Filsfils, C., Previdi, S., Decraene, B., and R. Shakir, "Resiliency use cases in SPRING networks", draft-ietf- spring-resiliency-use-cases-08 (work in progress), October 2016. [I-D.ietf-spring-segment-routing-central-epe] Filsfils, C., Previdi, S., Aries, E., Ginsburg, D., and D. Afanasiev, "Segment Routing Centralized BGP Peer Engineering", draft-ietf-spring-segment-routing-central- epe-02 (work in progress), September 2016. [I-D.ietf-spring-segment-routing-ldp-interop] Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., and S. Litkowski, "Segment Routing interworking with LDP", draft-ietf-spring-segment-routing-ldp-interop-04 (work in progress), July 2016. [I-D.ietf-spring-segment-routing-mpls] Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., Litkowski, S., Horneffer, M., Shakir, R., jefftant@gmail.com, j., and E. Crabbe, "Segment Routing with MPLS data plane", draft-ietf-spring-segment-routing- mpls-05 (work in progress), July 2016. [I-D.ietf-spring-segment-routing-msdc] Filsfils, C., Previdi, S., Mitchell, J., Aries, E., and P. Lapukhov, "BGP-Prefix Segment in large-scale data centers", draft-ietf-spring-segment-routing-msdc-02 (work in progress), October 2016. [I-D.ietf-spring-sr-oam-requirement] Kumar, N., Pignataro, C., Akiya, N., Geib, R., Mirsky, G., and S. Litkowski, "OAM Requirements for Segment Routing Network", draft-ietf-spring-sr-oam-requirement-02 (work in progress), July 2016. [I-D.ietf-spring-sr-yang] Litkowski, S., Qu, Y., Sarkar, P., and J. Tantsura, "YANG Data Model for Segment Routing", draft-ietf-spring-sr- yang-05 (work in progress), October 2016. Filsfils, et al. Expires May 23, 2017 [Page 27] Internet-Draft Segment Routing November 2016 [RFC4381] Behringer, M., "Analysis of the Security of BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4381, DOI 10.17487/RFC4381, February 2006, . [RFC4915] Psenak, P., Mirtorabi, S., Roy, A., Nguyen, L., and P. Pillay-Esnault, "Multi-Topology (MT) Routing in OSPF", RFC 4915, DOI 10.17487/RFC4915, June 2007, . [RFC5036] Andersson, L., Ed., Minei, I., Ed., and B. Thomas, Ed., "LDP Specification", RFC 5036, DOI 10.17487/RFC5036, October 2007, . [RFC5095] Abley, J., Savola, P., and G. Neville-Neil, "Deprecation of Type 0 Routing Headers in IPv6", RFC 5095, DOI 10.17487/RFC5095, December 2007, . [RFC5120] Przygienda, T., Shen, N., and N. Sheth, "M-ISIS: Multi Topology (MT) Routing in Intermediate System to Intermediate Systems (IS-ISs)", RFC 5120, DOI 10.17487/RFC5120, February 2008, . [RFC5920] Fang, L., Ed., "Security Framework for MPLS and GMPLS Networks", RFC 5920, DOI 10.17487/RFC5920, July 2010, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC6549] Lindem, A., Roy, A., and S. Mirtorabi, "OSPFv2 Multi- Instance Extensions", RFC 6549, DOI 10.17487/RFC6549, March 2012, . [RFC6822] Previdi, S., Ed., Ginsberg, L., Shand, M., Roy, A., and D. Ward, "IS-IS Multi-Instance", RFC 6822, DOI 10.17487/RFC6822, December 2012, . [RFC7794] Ginsberg, L., Ed., Decraene, B., Previdi, S., Xu, X., and U. Chunduri, "IS-IS Prefix Attributes for Extended IPv4 and IPv6 Reachability", RFC 7794, DOI 10.17487/RFC7794, March 2016, . Filsfils, et al. Expires May 23, 2017 [Page 28] Internet-Draft Segment Routing November 2016 [RFC7855] Previdi, S., Ed., Filsfils, C., Ed., Decraene, B., Litkowski, S., Horneffer, M., and R. Shakir, "Source Packet Routing in Networking (SPRING) Problem Statement and Requirements", RFC 7855, DOI 10.17487/RFC7855, May 2016, . Authors' Addresses Clarence Filsfils (editor) Cisco Systems, Inc. Brussels BE Email: cfilsfil@cisco.com Stefano Previdi (editor) Cisco Systems, Inc. Via Del Serafico, 200 Rome 00142 Italy Email: sprevidi@cisco.com Bruno Decraene Orange FR Email: bruno.decraene@orange.com Stephane Litkowski Orange FR Email: stephane.litkowski@orange.com Rob Shakir Google, Inc. 1600 Amphitheatre Parkway Mountain View, CA 94043 Email: robjs@google.com Filsfils, et al. 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[213.123.124.182]) by smtp.gmail.com with ESMTPSA id c81sm7904150wmf.22.2016.11.30.05.27.26 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 30 Nov 2016 05:27:27 -0800 (PST) To: "Stefano Previdi (sprevidi)" References: <9c309847-d267-6397-274d-ec387b7332e1@gmail.com> <9F8F62C6-6DE3-4EEC-BE01-FC57914FD3F5@cisco.com> From: Stewart Bryant Message-ID: <0bf878bd-0746-0303-c6f9-c35d58f1ff90@gmail.com> Date: Wed, 30 Nov 2016 13:27:24 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.5.0 MIME-Version: 1.0 In-Reply-To: <9F8F62C6-6DE3-4EEC-BE01-FC57914FD3F5@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Cc: "spring@ietf.org" , "draft-ietf-spring-segment-routing@ietf.org" , "spring-chairs@tools.ietf.org" Subject: Re: [spring] WG LC for draft-ietf-spring-segment-routing X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.17 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, 30 Nov 2016 13:28:13 -0000 On 30/11/2016 10:38, Stefano Previdi (sprevidi) wrote: >> On Nov 29, 2016, at 8:21 PM, Stewart Bryant wrote: >> >> The following are my comments on this text in response to the WGLC. >> A lot of comments are embedded in the draft text below. >> >> However I have some major overarching comments. Although this is called >> an architecture it seems to be rather more of a description of how >> a large number of other documents combine to produce an overall >> specification for SR. > > the references points to protocol extensions that would allow to implement the architecture. Then, you have other documents describing the use cases. > > We’ve been debating quite a bit at the time of the spring wg forming and we agreed to separate these topics (i.e.: architecture, protocol extensions and use cases). Separating them is fine, and having a use case dependency i.e. requirements is OK, so long as the IESG agree to publish them (there is a policy decision that makes this less automatic than it used to be). However I think the architecture really needs to stand alone and above the implementations. > > Now, of course, having these references may impact the publication process of the architecture draft and maybe we should revisit many of the references. That would be wise. Also because you are changing the IPv6 dataplane, I don't think you can assume it is done until it is done and yet you have a lot of detail in the architecture. I don't see why the architecture needs any of that detail. At the arch level you really just have a list of instructions yet to be executed and everything else is implementation of that architecture. > > Having said that, having a document with all the pointers to use cases and protocols helps the reader. > > >> Certainly for an architecture the number >> of forward references to detailed solutions for a description of the >> concept is quite extraordinary. >> >> So embedded is the contents of some of these referenced documents >> that I do not think that it safe to publish this text other than >> synchronously with some of those documents. This is absolutely the case >> for the dataplane definitions, especially for IPv6, but seems >> likely to apply to other references. The further implication of >> the constant dependence on other documents is that many of them >> are really normative rather than informative references, making >> this document a hostage to their fate. >> >> It is far more conventional in an architecture to set out the general >> description and state the invariants, and put the detail into >> specific protocol documents, but to have the architecture as a >> standalone text. In other words to set things out so that >> the reader understands how components fit together, what the subtleties >> are and what the constraints on the components are, but leave the >> component design decisions to the component designers. > > we can easily re-phrase most of the sections and remove some of the references so to free (or relax) most of the dependencies. That would be a good idea. > >> Clearly I think this draft needs significant work before it is >> ready for submission to the IESG for publication. > > Well, I think it may require some editorial changes but I think the architecture structure and component is pretty solid... otherwise we wouldn’t have multi-vendor implementations and deployments... I agree that the MPLS side is likely to be safe. I don't think IP is as safe and will not do so until I actually see it in the RFC editor's queue. I do worry that the stack/(list+pointer) + address scope differences may lead to design stress going forward. I have not looked at the detail of the sub-components yet. > > I’ll go through your other comments in a separate email. > > Thanks. > s. > - Stewart > >> - Stewart >> >> >> >> >> Network Working Group C. Filsfils, Ed. >> Internet-Draft S. Previdi, Ed. >> Intended status: Standards Track Cisco Systems, Inc. >> Expires: May 23, 2017 B. Decraene >> S. Litkowski >> Orange >> R. Shakir >> Google >> November 19, 2016 >> >> >> Segment Routing Architecture >> draft-ietf-spring-segment-routing-10 >> >> Abstract >> >> Segment Routing (SR) leverages the source routing paradigm. A node >> steers a packet through an ordered list of instructions, called >> segments. A segment can represent any instruction, topological or >> service-based. A segment can have a local semantic to an SR node or >> global within an SR domain. 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. >> >> SB> Since you mention service chains here, we really should be having >> SB> a wider discussion about whether SR and SFC are really the same >> SB> technology. >> >> Segment Routing can be directly applied to the MPLS architecture with >> no change on the forwarding plane. >> >> SB> Applied to or implemented using MPLS? >> >> A segment is encoded as an MPLS >> label. An ordered list of segments is encoded as a stack of labels. >> The segment to process is on the top of the stack. Upon completion >> of a segment, the related label is popped from the stack. >> >> Segment Routing can be applied to the IPv6 architecture, with a new >> type of routing header. A segment is encoded as an IPv6 address. An >> ordered list of segments is encoded as an ordered list of IPv6 >> addresses in the routing header. The active segment is indicated by >> the Destination Address of the packet. The next active segment is >> indicated by a pointer in the new routing header. >> >> SB> You really cannot say this until the v6 design goes to RFC, although >> SB> I do not see why this needs to be stated. >> SB> What I did not see in here is a proper comparision of the consequences >> SB> of the stack vs list and pointer approach. The consequences of the >> SB> difefrence between these two approaches may be far reaching in the long >> SB> term and lead to biforcation of the architecture, something we should >> SB> think about carefully up front. >> >> >> Requirements Language >> >> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", >> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this >> document are to be interpreted as described in RFC 2119 [RFC2119]. >> >> Status of This Memo >> >> This Internet-Draft is submitted in full conformance with the >> provisions of BCP 78 and BCP 79. >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 1] >> >> Internet-Draft Segment Routing November 2016 >> >> >> Internet-Drafts are working documents of the Internet Engineering >> Task Force (IETF). Note that other groups may also distribute >> working documents as Internet-Drafts. The list of current Internet- >> Drafts is at http://datatracker.ietf.org/drafts/current/. >> >> Internet-Drafts are draft documents valid for a maximum of six months >> and may be updated, replaced, or obsoleted by other documents at any >> time. It is inappropriate to use Internet-Drafts as reference >> material or to cite them other than as "work in progress." >> >> This Internet-Draft will expire on May 23, 2017. >> >> Copyright Notice >> >> Copyright (c) 2016 IETF Trust and the persons identified as the >> document authors. All rights reserved. >> >> This document is subject to BCP 78 and the IETF Trust's Legal >> Provisions Relating to IETF Documents >> (http://trustee.ietf.org/license-info) in effect on the date of >> publication of this document. Please review these documents >> carefully, as they describe your rights and restrictions with respect >> to this document. Code Components extracted from this document must >> include Simplified BSD License text as described in Section 4.e of >> the Trust Legal Provisions and are provided without warranty as >> described in the Simplified BSD License. >> >> Table of Contents >> >> 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 >> 1.1. Companion Documents . . . . . . . . . . . . . . . . . . . 4 >> 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5 >> 3. Link-State IGP Segments . . . . . . . . . . . . . . . . . . . 7 >> 3.1. IGP Segment, IGP SID . . . . . . . . . . . . . . . . . . 7 >> 3.2. IGP-Prefix Segment, Prefix-SID . . . . . . . . . . . . . 7 >> 3.2.1. Prefix-SID Algorithm . . . . . . . . . . . . . . . . 7 >> 3.2.2. MPLS Dataplane . . . . . . . . . . . . . . . . . . . 9 >> 3.2.3. IPv6 Dataplane . . . . . . . . . . . . . . . . . . . 10 >> 3.3. IGP-Node Segment, Node-SID . . . . . . . . . . . . . . . 10 >> 3.4. IGP-Anycast Segment, Anycast SID . . . . . . . . . . . . 11 >> 3.5. IGP-Adjacency Segment, Adj-SID . . . . . . . . . . . . . 14 >> 3.5.1. Parallel Adjacencies . . . . . . . . . . . . . . . . 15 >> 3.5.2. LAN Adjacency Segments . . . . . . . . . . . . . . . 16 >> 3.6. Binding Segment . . . . . . . . . . . . . . . . . . . . . 16 >> 3.6.1. Mapping Server . . . . . . . . . . . . . . . . . . . 16 >> 3.6.2. Tunnel Headend . . . . . . . . . . . . . . . . . . . 17 >> 3.7. Inter-Area Considerations . . . . . . . . . . . . . . . . 17 >> 4. BGP Peering Segments . . . . . . . . . . . . . . . . . . . . 18 >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 2] >> >> Internet-Draft Segment Routing November 2016 >> >> >> 5. IGP Mirroring Context Segment . . . . . . . . . . . . . . . 19 >> 6. Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . 19 >> 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19 >> 8. Security Considerations . . . . . . . . . . . . . . . . . . . 19 >> 8.1. MPLS Data Plane . . . . . . . . . . . . . . . . . . . . . 20 >> 8.2. IPv6 Data Plane . . . . . . . . . . . . . . . . . . . . . 21 >> 9. Manageability Considerations . . . . . . . . . . . . . . . . 22 >> 10. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 24 >> 11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 24 >> 12. References . . . . . . . . . . . . . . . . . . . . . . . . . 25 >> 12.1. Normative References . . . . . . . . . . . . . . . . . . 25 >> 12.2. Informative References . . . . . . . . . . . . . . . . . 25 >> Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 29 >> >> 1. Introduction >> >> With Segment Routing (SR), a node steers a packet through an ordered >> list of instructions, called segments. A segment can represent any >> instruction, topological or service-based. A segment can have a >> >> SB> It really is a pity that we did not use the more descriptive term instructions >> SB> which would have help people understand what they are. I wonder if it is >> SB> too late to change? >> SB> Service based what? >> >> local semantic to an SR node or global within an SR domain. SR >> allows to enforce a flow through any path and service chain while >> maintaining per-flow state only at the ingress node of the SR domain. >> >> SB> I wonder if we should be pulling together SR and SFC into >> SB> a common architecture, since they seem to have converged? >> >> >> Segment Routing can be directly applied to the MPLS architecture >> ([RFC3031]) with no change on the forwarding plane. A segment is >> encoded as an MPLS label. An ordered list of segments is encoded as >> a stack of labels. The active segment is on the top of the stack. A >> completed segment is popped off the stack. The addition of a segment >> is performed with a push. >> >> SB> All true, but we are designing a solution for both MPLS and IP. >> SB> Shouldn't this text be establishing the architectural princples >> SB> first before getting down in the weeds of the MPLS solution? >> SB> >> >> SB> IP and MPLS took different approaches so at this level we need to >> SB> be discussing the principles, and establish the properties of >> SB> the list, which again are radically different, and then let the >> SB> solutions drafts describe the instantiation of the list. >> >> In the Segment Routing MPLS instantiation, a segment could be of >> several types: >> >> o an IGP segment, >> >> o a BGP Peering segments, >> >> o an LDP LSP segment, >> >> o an RSVP-TE LSP segment, >> >> o a BGP LSP segment. >> >> SB> All true, but right down in the weeds. What about the functional >> SB> equivalents in IP? >> >> The first two (IGP and BGP Peering segments) types of segments are >> defined in this document. The use of the last three types of >> segments is illustrated in [I-D.ietf-spring-segment-routing-mpls]. >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 3] >> >> Internet-Draft Segment Routing November 2016 >> >> >> Segment Routing can be applied to the IPv6 architecture ([RFC2460]), >> with a new type of routing header. A segment is encoded as an IPv6 >> address. An ordered list of segments is encoded as an ordered list >> of IPv6 addresses in the routing header. The active segment is >> indicated by the Destination Address of the packet. Upon completion >> of a segment, a pointer in the new routing header is incremented and >> indicates the next segment. >> >> SB> Again this is down in the weeds considering that we are in an architecture >> SB> document and also proposes the detail of a solution that may or may >> SB> not be finalized. >> >> >> Numerous use-cases illustrate the benefits of source routing either >> for FRR, OAM or Traffic Engineering reasons. >> >> SB> This needs a reference. >> >> This document defines a set of instructions (called segments) that >> are required to fulfill the described use-cases. These segments can >> either be used in isolation (one single segment defines the source >> route of the packet) or in combination (these segments are part of an >> ordered list of segments that define the source route of the packet). >> >> >> 1.1. Companion Documents >> >> This document defines the SR architecture, its routing model, the >> IGP-based segments, the BGP-based segments and the service segments. >> >> Use cases are described in [RFC7855], >> [I-D.ietf-spring-segment-routing-central-epe], >> [I-D.ietf-spring-segment-routing-msdc], >> [I-D.filsfils-spring-large-scale-interconnect], >> [I-D.ietf-spring-ipv6-use-cases], >> [I-D.ietf-spring-resiliency-use-cases], [I-D.ietf-spring-oam-usecase] >> and [I-D.ietf-spring-sr-oam-requirement]. >> >> SB> It would be helpful to the reader to indicate the contents, so that >> SB> if this just becomes a set of RFC numbers they had some better its >> SB> what the documents are about. >> SB> >> SB> It would also be useful to get an understanding from the AD >> SB> as to which of the use case documents will be published, merged >> SB> become part of a wiki etc given recent policy statements from the IESG. >> >> >> Segment Routing for MPLS dataplane is documented in >> [I-D.ietf-spring-segment-routing-mpls]. >> >> Segment Routing for IPv6 dataplane is documented in >> [I-D.ietf-6man-segment-routing-header]. >> >> IGP protocol extensions for Segment Routing are described in >> [I-D.ietf-isis-segment-routing-extensions], >> [I-D.ietf-ospf-segment-routing-extensions] and >> [I-D.ietf-ospf-ospfv3-segment-routing-extensions] referred in this >> document as "IGP SR extensions documents". >> >> The FRR solution for SR is documented in >> [I-D.francois-rtgwg-segment-routing-ti-lfa]. >> >> The PCEP protocol extensions for Segment Routing are defined in >> [I-D.ietf-pce-segment-routing]. >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 4] >> >> Internet-Draft Segment Routing November 2016 >> >> >> The interaction between SR/MPLS with other MPLS Signaling planes is >> documented in [I-D.ietf-spring-segment-routing-ldp-interop]. >> >> 2. Terminology >> >> Segment: an instruction a node executes on the incoming packet (e.g.: >> forward packet according to shortest path to destination, or, forward >> packet through a specific interface, or, deliver the packet to a >> given application/service instance). >> >> SID: a Segment Identifier. Examples of SIDs are: a MPLS label, an >> index value in a MPLS label space, an IPv6 address. Other types of >> SIDs can be defined in the future. >> >> SB> Definition by example is not a definition. >> >> Segment List: ordered list of SID's encoding the topological and >> service source route of the packet. >> >> SB> Isn't it an ordered list of SID encoding the ordered set of >> SB> instructions to be applies to the packet as it traverses the >> SB> SR domain? >> >> It is a stack of labels in the >> MPLS architecture. It is an ordered list of IPv6 addresses in the >> IPv6 architecture. >> >> SB> Again this a architecture it should not go down in those weeds. >> >> >> Segment Routing Domain (SR Domain): the set of nodes participating >> into the source based routing model. >> SB> Surely is is the set of nodes that form an SR Instance having a >> SB> common view of the mapping of SID to instruction definition >> >> These nodes may be connected to >> the same physical infrastructure (e.g.: a Service Provider's network) >> as well as nodes remotely connected to each other (e.g.: an >> enterprise VPN or an overlay). Note that a SR domain may also be >> confined within an IGP instance, in which case it is named SR-IGP >> Domain. >> >> Active segment: the segment that MUST be used by the receiving router >> to process the packet. In the MPLS dataplane is the top label. In >> the IPv6 dataplane is the destination address of a packet having the >> Segment Routing Header as defined in >> [I-D.ietf-6man-segment-routing-header]. >> >> SB> I am surprised that you don't need to define POP or Remove >> >> PUSH: the insertion of a segment at the head of the Segment list. >> >> SB> This works for a stack model, but I am not sure it works for >> SB> a list model where you really do an insert. >> >> NEXT: the active segment is completed, the next segment becomes >> active. >> >> CONTINUE: the active segment is not completed and hence remains >> active. The CONTINUE instruction is implemented as the SWAP >> instruction in the MPLS dataplane. In IPv6, this is the plain IPv6 >> forwarding action of a regular IPv6 packet according to its >> Destination Address. >> >> SB> Again I worry about definition by example. >> >> SR Global Block (SRGB): local property of an SR node. In the MPLS >> architecture, SRGB is the set of local labels reserved for global >> segments. Using the same SRGB on all nodes within the SR domain ease >> operations and troubleshooting and is expected to be a deployment >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 5] >> >> Internet-Draft Segment Routing November 2016 >> >> >> guideline. In the IPv6 architecture, the equivalent of the SRGB is >> in fact the set of addresses used as global segments. Since there >> are no restrictions on which IPv6 address can be used, the concept of >> the SRGB includes all IPv6 global address space used within the SR >> domain. >> >> SB> I worry about whether this is an architectural concept of a >> SB> specific dataplane concept, or an implementation concept. Since >> SB> the IPv6 design moved from a set of short instructions to full >> SB> IPv6 addresses, this does not look like an architectural construct. >> >> Global Segment: the related instruction is supported by all the SR- >> capable nodes in the domain. >> >> SB> instruction or identifier. Isn't the point about this that any node >> SB> knows how to execute its view of the instruction, and indeed >> SB> it is possible that the mapping at some nodes (for example forward) >> SB> may be different from the mapping at another node (for example >> SB> receive, or deliver to attached firewall) >> >> In the MPLS architecture, a Global >> Segment has a globally-unique index. The related local label at a >> given node N is found by adding the globally-unique index to the SRGB >> of node N. In the IPv6 architecture, a global segment is a globally- >> unique IPv6 address. >> >> SB> Again this muddles architecture and mapping to an instantiation >> SB> of that architecture. >> SB> nit s/has a globally-unique/ is a globally-unique/ >> SB> However this begs the question of the scope of global. Certainly >> SB> in MPLS it is restricted to the SR-Domain, and even then it may >> SB> only be a sub-set of it. >> >> Local Segment: the related instruction is supported only by the node >> originating it. >> >> SB> Again I think it is the mapping of the instruction identifier to >> SB> the instruction rather than the instruction. >> >> In the MPLS architecture, this is a local label >> outside the SRGB. In the IPv6 architecture, this can be any IPv6 >> address whose reachability is not advertised in any routing protocol >> (hence, the segment is known only by the local node). >> >> SB> Wait a moment the instruction is understood by the imposing node(s) >> SB> and the executing node >> >> IGP Segment: the generic name for a segment attached to a piece of >> information advertised by a link-state IGP, e.g. an IGP prefix or an >> IGP adjacency. >> >> SB> I don't think it's a name. Isn't it simply a segment that is advertised >> SB> by an IGP? Of course that takes us back to the scoping definition, since >> SB> all nodes receive the IGP information. >> >> IGP-prefix Segment, Prefix-SID: an IGP-Prefix Segment is an IGP >> segment attached to an IGP prefix. >> >> SB> What does attached mean here? >> >> An IGP-Prefix Segment is global >> (unless explicitly advertised otherwise) within the SR IGP instance/ >> topology and identifies an instruction to forward the packet along >> the path computed using the routing algorithm specified in the >> algorithm field, in the topology and the IGP instance where it is >> advertised. >> >> SB> More precisely isn't it an instruction to forward a packet >> SB> along the path computed for a specified prefix? >> >> The Prefix-SID is the SID of the IGP-Prefix Segment. >> SB> I think that this should be a separate definition. >> >> IGP-Anycast: an IGP-Anycast Segment is an IGP-prefix segment which >> does not identify a specific router, but a set of routers. The terms >> "Anycast Segment" or "Anycast-SID" are often used as an abbreviation. >> >> IGP-Adjacency: an IGP-Adjacency Segment is an IGP segment attached to >> an unidirectional adjacency or a set of unidirectional adjacencies. >> By default, an IGP-Adjacency Segment is local (unless explicitly >> advertised otherwise) to the node that advertises it. >> >> SB> What are the semantics of a non local adjacency segment? >> >> IGP-Node: an IGP-Node Segment is an IGP-Prefix Segment which >> identifies a specific router (e.g. a loopback). The terms "Node >> Segment" or Node-SID" are often used as an abbreviation. >> >> SR Tunnel: a list of segments to be pushed on the packets directed on >> the tunnel. The list of segments can be specified explicitly or >> implicitly via a set of abstract constraints (latency, affinity, >> SRLG, ...). In the latter case, a constraint-based path computation >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 6] >> >> Internet-Draft Segment Routing November 2016 >> >> >> is used to determine the list of segments associated with the tunnel. >> The computation can be local or delegated to a PCE server. An SR >> tunnel can be configured by the operator, provisioned via netconf or >> provisioned via PCEP. An SR tunnel can be used for traffic- >> engineering, OAM or FRR reasons. >> >> SB> So where does tunnel fit into that definition? Isn't the point >> SB> about a tunnel that it is a type of virtual link that constrains >> SB> a packet to a path other than the natural path that would be >> SB> inferred from its native address? >> >> Segment List Depth: the number of segments of an SR tunnel. The >> entity instantiating an SR Tunnel at a node N should be able to >> discover the depth insertion capability of the node N. The PCEP >> discovery capability is described in [I-D.ietf-pce-segment-routing]. >> >> SB> Isn't that just one way that such a size might be discovered? >> >> 3. Link-State IGP Segments >> >> Within a link-state IGP domain, an SR-capable IGP node advertises >> segments for its attached prefixes and adjacencies. These segments >> are called IGP segments or IGP SIDs. They play a key role in Segment >> Routing and use-cases as they enable the expression of any >> topological path throughout the IGP domain. Such a topological path >> is either expressed as a single IGP segment or a list of multiple IGP >> segments. >> >> SB> I am not sure that topological path is a well known term. A quick check >> SB> in google only found the term is one paper. Do you simply mean path? >> >> 3.1. IGP Segment, IGP SID >> >> The terms "IGP Segment" and "IGP SID" are the generic names for a >> segment attached to a piece of information advertised by a link-state >> IGP, e.g. an IGP prefix or an IGP adjacency. >> >> 3.2. IGP-Prefix Segment, Prefix-SID >> >> An IGP-Prefix Segment is an IGP segment attached to an IGP prefix. >> An IGP-Prefix Segment is global (unless explicitly advertised >> otherwise) within the SR/IGP domain. >> >> The required IGP protocol extensions are defined in IGP SR extensions >> documents. >> >> 3.2.1. Prefix-SID Algorithm >> >> The IGP protocol extensions for Segment Routing define the Prefix-SID >> advertisement which includes a set of flags and the algorithm field. >> The algorithm field has the purpose of associating a given Prefix-SID >> to a routing algorithm. >> >> In the context of an instance and a topology, multiple Prefix-SID's >> MAY be allocated to the same IGP Prefix as long as the algorithm >> value is different in each one. >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 7] >> >> Internet-Draft Segment Routing November 2016 >> >> >> Multiple instances and topologies are defined in IS-IS and OSPF in: >> [RFC5120], [RFC6822], [RFC6549] and [RFC4915]. >> >> Initially, two "algorithms" have been defined: >> >> o "Shortest Path": this algorithm is the default behavior. The >> packet is forwarded along the well known ECMP-aware SPF algorithm >> however it is explicitly allowed for a midpoint to implement >> another forwarding based on local policy.. The "Shortest Path" >> algorithm is in fact the default and current behavior of most of >> the networks where local policies may override the SPF decision. >> >> SB> If a node is going to apply local policy, doesn't there need to be a >> SB> comment about loop avoidance, and also possibly cleaning up the >> SB> SR header if local policy is to send the packet out of the domain? >> SB> I worry about what this means when this is applied to a SID >> SB> other than the final SID specifying the path. >> >> o "Strict Shortest Path": This algorithm mandates that the packet is >> forwarded according to ECMP-aware SPF algorithm and instruct any >> router in the path to ignore any possible local policy overriding >> SPF decision. The SID advertised with "Strict Shortest Path" >> algorithm ensures that the path the packet is going to take is the >> expected, and not altered, SPF path. >> >> An IGP-Prefix Segment identifies the path, to the related prefix, >> along the path computed as per the algorithm field. >> >> A packet injected anywhere within the SR/IGP domain with an active >> Prefix-SID will be forwarded along path computed by the algorithm >> expressed in the algorithm field. >> >> The ingress node of an SR domain validates that the path to a prefix, >> advertised with a given algorithm, includes nodes all supporting the >> advertised algorithm. As a consequence, if a node on the path does >> not support algorithm X, the IGP-Prefix segment will be interrupted >> and will drop packet on that node. It's the responsibility of the >> ingress node using a segment to check that all downstream nodes >> support the algorithm of the segment. >> >> A router MUST NOT forward any SR traffic associated with the SR >> algorithm to the adjacent router, if the adjacent router has not >> advertised support for such SR algorithm. >> >> It has to be noted that Fast Reroute (FRR) mechanisms, such as the >> one described in [I-D.francois-rtgwg-segment-routing-ti-lfa], that >> are based on post-convergence SPF, are still compliant to the Strict- >> SPF algorithm definition. >> >> Details of the two defined algorithms are defined in >> [I-D.ietf-isis-segment-routing-extensions], >> [I-D.ietf-ospf-segment-routing-extensions] and >> [I-D.ietf-ospf-ospfv3-segment-routing-extensions]. >> >> SB> I am not convinced that the statements on IPFRR belong in the >> SB> architecture, surely they belong in the IPFRR document together >> SB> a declaration of architectural conformance? >> >> Filsfils, et al. Expires May 23, 2017 [Page 8] >> >> Internet-Draft Segment Routing November 2016 >> >> >> 3.2.2. MPLS Dataplane >> >> SB> I am not convinced that this is architecture, more implementation >> SB> in a specific dataplane. It is not particularly critical in the case of >> SB> MPLS as we pretty much know what it looks like. I remain to be convinced >> SB> about IP. The problem is that if the dataplane design changes, it may >> SB> invalidate the architecture. Best practise is to be invariant to the >> SB> implementation when there are multiple possible data planes. >> >> When SR is used over the MPLS dataplane: >> >> o the IGP signaling extension for IGP-Prefix segment includes the >> P-Flag ([I-D.ietf-isis-segment-routing-extensions]) or the NP-Flag >> ([I-D.ietf-ospf-segment-routing-extensions]). A Node N >> advertising a Prefix-SID SID-R for its attached prefix R unset 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. >> >> SB> That is really down in the weeds, and I am not sure it belongs here. >> SB> surely you need to specify the requirement on the solution, not the >> SB> solution itself in this document. Alternatively, if it does belong here >> SB> it needs a more complete description here. >> >> >> o A Prefix-SID is allocated in the form of an index in the SRGB (or >> as a local MPLS label) according to a process similar to IP >> address allocation. Typically the Prefix-SID is allocated by >> policy by the operator (or NMS) and the SID very rarely changes. >> >> o While SR allows to attach a local segment to an IGP prefix (using >> the L-Flag), >> SB> what is an L-flag? >> >> we specifically assume that when the terms "IGP- >> Prefix Segment" and "Prefix-SID" are used, the segment is global >> (the SID is allocated from the SRGB or as an index). This is >> consistent with all the described use-cases that require global >> segments attached to IGP prefixes. >> >> o The allocation process MUST NOT allocate the same Prefix-SID to >> different IP prefixes. >> >> o If a node learns a Prefix-SID having a value that falls outside >> the locally configured SRGB range, then the node MUST NOT use the >> Prefix-SID and SHOULD issue an error log warning for >> misconfiguration. >> >> o If a node N advertises Prefix-SID SID-R for a prefix R that is >> attached to N, N MUST either clear the P-Flag in the advertisement >> of SID-R, or else maintain the following FIB entry: >> >> SB> Where did the P-Flag come from? >> >> Incoming Active Segment: SID-R >> Ingress Operation: NEXT >> Egress interface: NULL >> >> o A remote node M MUST maintain the following FIB entry for any >> learned Prefix-SID SID-R attached to IP prefix R: >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 9] >> >> Internet-Draft Segment Routing November 2016 >> >> >> Incoming Active Segment: SID-R >> Ingress Operation: >> If the next-hop of R is the originator of R >> and instructed to remove the active segment: NEXT >> Else: CONTINUE >> Egress interface: the interface towards the next-hop along the >> path computed using the algorithm advertised with >> the SID toward prefix R. >> >> SB> This is quite confusing. Don't these sorts of operations apply to other sorts of >> SB> SID, such as nodal SIDs? Why are these called out in detail but not others? >> >> SB> You talk about ECMP in nodal, doesn't that also apply here? >> >> 3.2.3. IPv6 Dataplane >> >> When SR is used over the IPv6 dataplane: >> >> o The Prefix-SID is the prefix itself. No additional identifier is >> needed for Segment Routing over IPv6. >> >> o Any address belonging to any of the node's prefixes can be used as >> Prefix-SIDs. >> >> o An operator may want to explicitly indicate which of the node's >> prefixes can be used as Prefix-SIDs through the setting of a flag >> (e.g.: using the IGP prefix attribute defined in [RFC7794]) in the >> routing protocol used for advertising the prefix. >> >> o A global SID is instantiated through any globally advertised IPv6 >> address. >> >> o A local SID is instantiated through a local IPv6 prefix not being >> advertised and therefore known only by the local node. >> >> A node N advertising an IPv6 address R usable as a segment identifier >> MUST maintain the following FIB entry: >> >> Incoming Active Segment: R >> Ingress Operation: NEXT >> Egress interface: NULL >> >> Regardless Segment Routing, any remote IPv6 node will maintain a >> plain IPv6 FIB entry for any prefix, no matter if they represent a >> segment or not. >> >> 3.3. IGP-Node Segment, Node-SID >> >> An IGP Node Segment is a an IGP Prefix Segment which identifies a >> specific router (e.g. a loopback). The terms "Node Segment" or >> "Node-SID" are often used as an abbreviation. The IGP SR extensions >> define a flag that identifies Node-SIDs. >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 10] >> >> Internet-Draft Segment Routing November 2016 >> >> >> A "Node Segment" or "Node-SID" is fundamental to SR. From anywhere >> in the network, it enforces the ECMP-aware shortest-path forwarding >> of the packet towards the related node. >> >> An IGP Node-SID MUST NOT be associated with a prefix that is owned by >> more than one router within the same routing domain. >> >> 3.4. IGP-Anycast Segment, Anycast SID >> >> An IGP-Anycast Segment is an IGP-prefix segment which does not >> identify a specific router, but a set of routers. The terms "Anycast >> Segment" or "Anycast-SID" are often used as an abbreviation. >> >> An "Anycast Segment" or "Anycast SID" enforces the ECMP-aware >> shortest-path forwarding towards the closest node of the anycast set. >> This is useful to express macro-engineering policies or protection >> mechanisms. >> >> An IGP-Anycast Segment MUST NOT reference a particular node. >> >> Within an anycast group, all routers MUST advertise the same prefix >> with the same SID value. >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 11] >> >> Internet-Draft Segment Routing November 2016 >> >> >> +--------------+ >> | Group A | >> |192.0.2.10/32 | >> | SID:100 | >> | | >> +-----------A1---A3----------+ >> | | | \ / | | | >> SID:10 | | | / | | | SID:30 >> 203.0.113.1/32 | | | / \ | | | 203.0.113.3/32 >> PE1------R1----------A2---A4---------R3------PE3 >> \ /| | | |\ / >> \ / | +--------------+ | \ / >> \ / | | \ / >> / | | / >> / \ | | / \ >> / \ | +--------------+ | / \ >> / \| | | |/ \ >> PE2------R2----------B1---B3----+----R4------PE4 >> 203.0.113.2/32 | | | \ / | | | 203.0.113.4/32 >> SID:20 | | | / | | | SID:40 >> | | | / \ | | | >> +-----+-----B2---B4----+-----+ >> | | >> | Group B | >> | 192.0.2.1/32 | >> | SID:200 | >> +--------------+ >> >> Transit device groups >> >> The figure above describes a network example with two groups of >> transit devices. Group A consists of devices {A1, A2, A3 and A4}. >> They are all provisioned with the anycast address 192.0.2.10/32 and >> the anycast SID 100. >> >> Similarly, group B consists of devices {B1, B2, B3 and B4} and are >> all provisioned with the anycast address 192.0.2.1/32, anycast SID >> 200. In the above network topology, each PE device is connected to >> two routers in each of the groups A and B. >> >> PE1 can choose a particular transit device group when sending traffic >> to PE3 or PE4. This will be done by pushing the anycast SID of the >> group in the stack. >> >> Processing the anycast, and subsequent segments, requires special >> care. >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 12] >> >> Internet-Draft Segment Routing November 2016 >> >> >> Obviously, the value of the SID following the anycast SID MUST be >> understood by all nodes advertising the same anycast segment. >> >> +-------------------------+ >> | Group A | >> | 192.0.2.10/32 | >> | SID:100 | >> |-------------------------| >> | | >> | SRGB: SRGB: | >> SID:10 |(1000-2000) (3000-4000)| SID:30 >> PE1---+ +-------A1-------------A3-------+ +---PE3 >> \ / | | \ / | | \ / >> \ / | | +-----+ / | | \ / >> SRGB: \ / | | \ / | | \ / SRGB: >> (7000-8000) R1 | | \ | | R3 (6000-7000) >> / \ | | / \ | | / \ >> / \ | | +-----+ \ | | / \ >> / \ | | / \ | | / \ >> PE2---+ +-------A2-------------A4-------+ +---PE4 >> SID:20 | SRGB: SRGB: | SID:40 >> |(2000-3000) (4000-5000)| >> | | >> +-------------------------+ >> >> Transit paths via anycast group A >> >> Considering a MPLS deployment, in the above topology, if device PE1 >> (or PE2) requires to send a packet to the device PE3 (or PE4) it >> needs to encapsulate the packet in a MPLS payload with the following >> stack of labels. >> >> SB> AS an MPLS payload? >> >> o Label allocated by R1 for anycast SID 100 (outer label). >> >> o Label allocated by the nearest router in group A for SID 30 (for >> destination PE3). >> >> While the first label is easy to compute, in this case since there >> are more than one topologically nearest devices (A1 and A2), unless >> A1 and A2 allocated the same label value to the same prefix, >> determining the second label is impossible. Devices A1 and A2 may be >> devices from different hardware vendors. If both don't allocate the >> same label value for SID 30, it is impossible to use the anycast >> group "A" as a transit anycast group towards PE3. Hence, PE1 (or >> PE2) cannot compute an appropriate label stack to steer the packet >> exclusively through the group A devices. Same holds true for devices >> PE3 and PE4 when trying to send a packet to PE1 or PE2. >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 13] >> >> Internet-Draft Segment Routing November 2016 >> >> >> To ease the use of anycast segment in a short term, it is recommended >> to configure the same SRGB on all nodes of a particular anycast >> group. Using this method, as mentioned above, computation of the >> label following the anycast segment is straightforward. >> >> Using anycast segment without configuring the same SRGB on nodes >> belonging to the same device group may lead to misrouting (in a MPLS >> VPN deployment, some traffic may leak between VPNs). >> >> SB> So is this an architectural statement that mixed vendor anycast >> SB> does not work? In which case I wonder if it should be in the >> SB> architecture at all. >> >> 3.5. IGP-Adjacency Segment, Adj-SID >> >> An IGP-Adjacency Segment is an IGP segment attached to a >> unidirectional adjacency or a set of unidirectional adjacencies. By >> default, an IGP-Adjacency Segment is local to the node which >> advertises it. However, an Adjacency Segment can be global if >> advertised by the IGP as such. The SID of the IGP-Adjacency Segment >> is called the Adj-SID. >> >> SB> I think that there is some confusion about the meaning of global >> SB> in this draft. Earlier on the term implied that global meant that >> SB> any node would know how to execute the instruction, here it >> SB> seems to imply that it is global if the value is known globally. >> >> The adjacency is formed by the local node (i.e., the node advertising >> the adjacency in the IGP) and the remote node (i.e., the other end of >> the adjacency). The local node MUST be an IGP node. The remote node >> MAY be an adjacent IGP neighbor or a non-adjacent neighbor (e.g.: a >> Forwarding Adjacency, [RFC4206]). >> >> SB> Aren't Adjacency segments a concept in their own right with the >> SB> IGP just being one way of learning them? In which case shouldn't they >> SB> be introduced and explored in their own right first? >> >> A packet injected anywhere within the SR domain with a segment list >> {SN, SNL}, where SN is the Node-SID of node N and SNL is an Adj-SID >> attached by node N to its adjacency over link L, will be forwarded >> along the shortest-path to N and then be switched by N, without any >> IP shortest-path consideration, towards link L. If the Adj-SID >> identifies a set of adjacencies, then the node N load- balances the >> traffic among the various members of the set. >> >> Similarly, when using a global Adj-SID, a packet injected anywhere >> within the SR domain with a segment list {SNL}, where SNL is a global >> Adj-SID attached by node N to its adjacency over link L, will be >> forwarded along the shortest-path to N and then be switched by N, >> without any IP shortest-path consideration, towards link L. >> >> SB> Ah, I think some clarification is needed earlier in the text. >> SB> You have two types of ADJ-SID, the original one which was >> SB> a local label attached to a node so it only had meaning in >> SB> conjunction with the node identifier, and this new one which >> SB> is a full identity in it's own right. I think that needs to be >> SB> more clearly expressed, together with some discussion on scaling. >> SB> >> SB> This causes me to wonder why there is no overall discussion on the >> SB> scaling properties and issues, since that is very much an >> SB> an architectural concern. >> >> If the >> Adj-SID identifies a set of adjacencies, then the node N load- >> balances the traffic among the various members of the set. The use >> of global Adj-SID allows to reduce the size of the segment list when >> expressing a path at the cost of additional state (i.e.: the global >> Adj-SID will be inserted by all routers within the area in their >> forwarding table). >> >> SB> Doesn't it also use labels from the global label table which >> SB> is itself of a limited size? >> >> An "IGP Adjacency Segment" or "Adj-SID" enforces the switching of the >> packet from a node towards a defined interface or set of interfaces. >> This is key to theoretically prove that any path can be expressed as >> a list of segments. >> >> SB> This is surely a fundamental point that should be earlier in the >> SB> discussion. >> >> Filsfils, et al. Expires May 23, 2017 [Page 14] >> >> Internet-Draft Segment Routing November 2016 >> >> >> The encodings of the Adj-SID include the B-flag. When set, the Adj- >> SID refers to an adjacency that is eligible for protection (e.g.: >> using IPFRR or MPLS-FRR). >> >> SB> Where did the B-flag come from? >> >> The encodings of the Adj-SID include the L-flag. When set, the Adj- >> SID has local significance. By default the L-flag is set. >> >> A node SHOULD allocate one Adj-SIDs for each of its adjacencies. >> SB> This needs further discussion - for example why .. and is this >> SB> local or global? >> >> A node MAY allocate multiple Adj-SIDs to the same adjacency. An >> example is where the adjacency is established over a bundle >> interface. Each bundle member MAY have its own Adj-SID. >> >> A node MAY allocate the same Adj-SID to multiple adjacencies. >> >> SB> I am wondering is Adj is the right term here. In routing >> SB> an adjacency is a neighbouring node, but I think we are >> SB> actually talking here about Link-SIDs and Link-Bundle SIDs. >> >> Adjacency suppression MUST NOT be performed by the IGP. >> >> SB> Why/why not? >> >> A node MUST install a FIB entry for any Adj-SID of value V attached >> to data-link L: >> >> Incoming Active Segment: V >> Operation: NEXT >> Egress Interface: L >> >> The Adj-SID implies, from the router advertising it, the forwarding >> of the packet through the adjacency identified by the Adj-SID, >> regardless its IGP/SPF cost. In other words, the use of Adjacency >> Segments overrides the routing decision made by SPF algorithm. >> >> SB> nit: by the SPF >> >> 3.5.1. Parallel Adjacencies >> >> Adj-SIDs can be used in order to represent a set of parallel >> interfaces between two adjacent routers. >> >> SB> So we need to be clearer that an Adj-SID can be a Link, a Link Bundle or a link Group. >> >> >> A node MUST install a FIB entry for any locally originated Adjacency >> Segment (Adj-SID) of value W attached to a set of link B with: >> >> Incoming Active Segment: W >> Ingress Operation: NEXT >> Egress interface: loadbalance between any data-link within set B >> >> When parallel adjacencies are used and associated to the same Adj- >> SID, and in order to optimize the load balancing function, a "weight" >> factor can be associated to the Adj-SID advertised with each >> adjacency. The weight tells the ingress (or a SDN/orchestration >> system) about the loadbalancing factor over the parallel adjacencies. >> As shown in Figure 1, A and B are connected through two parallel >> adjacencies >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 15] >> >> Internet-Draft Segment Routing November 2016 >> >> >> link-1 >> +--------+ >> | | >> S---A B---C >> | | >> +--------+ >> link-2 >> >> Figure 1: Parallel Links and Adj-SIDs >> >> Node A advertises following Adj-SIDs and weights: >> >> o Link-1: Adj-SID 1000, weight: 1 >> >> o Link-2: Adj-SID 1000, weight: 2 >> >> Node S receives the advertisements of the parallel adjacencies and >> understands that by using Adj-SID 1000 node A will loadbalance the >> traffic across the parallel links (link-1 and link-2) according to a >> 1:2 ratio. >> >> SB> What happens about flow order when you use this construct? >> >> The weight value is advertised with the Adj-SID as defined in IGP SR >> extensions documents. >> >> 3.5.2. LAN Adjacency Segments >> >> In LAN subnetworks, link-state protocols define the concept of >> Designated Router (DR, in OSPF) or Designated Intermediate System >> (DIS, in IS-IS) that conduct flooding in broadcast subnetworks and >> that describe the LAN topology in a special routing update (OSPF >> Type2 LSA or IS-IS Pseudonode LSP). >> >> The difficulty with LANs is that each router only advertises its >> connectivity to the DR/DIS and not to each other individual nodes in >> the LAN. Therefore, additional protocol mechanisms (IS-IS and OSPF) >> are necessary in order for each router in the LAN to advertise an >> Adj-SID associated to each neighbor in the LAN. These extensions are >> defined in IGP SR extensions documents. >> >> SB> This should really be in the form "will need to be provided" >> >> 3.6. Binding Segment >> >> SB> I have read this section several times, and it is really not clear. >> SB> Nor is it clear that this is part of SR as opposed to a general >> SB> MPLS feature. >> >> 3.6.1. Mapping Server >> >> A Remote-Binding SID S advertised by the mapping server M for remote >> prefix R attached to non-SR-capable node N signals the same >> information as if N had advertised S as a Prefix-SID. Further >> details are described in the SR/LDP interworking procedures >> ([I-D.ietf-spring-segment-routing-ldp-interop]. >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 16] >> >> Internet-Draft Segment Routing November 2016 >> >> >> The segment allocation and SRGB Maintenance rules are the same as >> those defined for Prefix-SID. >> >> 3.6.2. Tunnel Headend >> >> The segment allocation and SRGB Maintenance rules are the same as >> those defined for Adj-SID. A tunnel attached to a head-end H acts as >> an adjacency attached to H. >> >> Note: an alternative consists of representing tunnels as forwarding- >> adjacencies ( [RFC4206]). In such case, the tunnel is presented to >> the routing area as a routing adjacency and is considered as such by >> all area routers. The Remote-Binding SID is preferred as it allows >> to advertise the presence of a tunnel without influencing the LSDB >> and the SPF computation. >> >> 3.7. Inter-Area Considerations >> >> In the following example diagram we assume an IGP deployed using >> areas and where SR has been deployed. >> >> ! ! >> ! ! >> B------C-----F----G-----K >> / | | | >> S---A/ | | | >> \ | | | >> \D------I----------J-----L----Z (192.0.2.1/32, Node-SID: 150) >> ! ! >> Area-1 ! Backbone ! Area 2 >> ! area ! >> >> Figure 2: Inter-Area Topology Example >> >> In area 2, node Z allocates Node-SID 150 to his local prefix >> 192.0.2.1/32. ABRs G and J will propagate the prefix into the >> backbone area by creating a new instance of the prefix according to >> normal inter-area/level IGP propagation rules. >> >> Nodes C and I will apply the same behavior when leaking prefixes from >> the backbone area down to area 1. Therefore, node S will see prefix >> 192.0.2.1/32 with Prefix-SID 150 and advertised by nodes C and I. >> >> It therefore results that a Prefix-SID remains attached to its >> related IGP Prefix through the inter-area process. >> >> When node S sends traffic to 192.0.2.1/32, it pushes Node-SID(150) as >> active segment and forward it to A. >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 17] >> >> Internet-Draft Segment Routing November 2016 >> >> >> When packet arrives at ABR I (or C), the ABR forwards the packet >> according to the active segment (Node-SID(150)). Forwarding >> continues across area borders, using the same Node-SID(150), until >> the packet reaches its destination. >> >> When an ABR propagates a prefix from one area to another it MUST set >> the R-Flag. >> >> SB> As far as I can see these flags are not properly defined in this architecture document. >> SB> What is really needed is a section on routing protocol indicators. >> >> 4. BGP Peering Segments >> >> In the context of BGP Egress Peer Engineering (EPE), as described in >> [I-D.ietf-spring-segment-routing-central-epe], an EPE enabled Egress >> PE node MAY advertise segments corresponding to its attached peers. >> These segments are called BGP peering segments or BGP Peering SIDs. >> They enable the expression of source-routed inter-domain paths. >> >> An ingress border router of an AS may compose a list of segments to >> steer a flow along a selected path within the AS, towards a selected >> egress border router C of the AS and through a specific peer. At >> minimum, a BGP Peering Engineering policy applied at an ingress PE >> involves two segments: the Node SID of the chosen egress PE and then >> the BGP Peering Segment for the chosen egress PE peer or peering >> interface. >> >> Hereafter, we will define three types of BGP peering segments/SID's: >> PeerNodeSID, PeerAdjSID and PeerSetSID. >> >> o PeerNode SID. A BGP PeerNode segment/SID is a local segment. At >> the BGP node advertising it, its semantics is: >> >> * SR header operation: NEXT. >> >> * Next-Hop: the connected peering node to which the segment is >> related. >> >> o PeerAdj SID: A BGP PeerAdj segment/SID is a local segment. At the >> BGP node advertising it, its semantics is: >> >> * SR header operation: NEXT. >> >> * Next-Hop: the peer connected through the interface to which the >> segment is related. >> >> o PeerSet SID. A BGP PeerSet segment/SID is a local segment. At >> the BGP node advertising it, its semantics is: >> >> * SR header operation: NEXT. >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 18] >> >> Internet-Draft Segment Routing November 2016 >> >> >> * Next-Hop: loadbalance across any connected interface to any >> peer in the related group. >> >> A peer set could be all the connected peers from the same AS or a >> subset of these. A group could also span across AS. The group >> definition is a policy set by the operator. >> >> The BGP extensions necessary in order to signal these BGP peering >> segments will be defined in a separate document. >> >> 5. IGP Mirroring Context Segment >> >> It is beneficial for an IGP node to be able to advertise its ability >> to process traffic originally destined to another IGP node, called >> the Mirrored node and identified by an IP address or a Node-SID, >> provided that a "Mirroring Context" segment be inserted in the >> segment list prior to any service segment local to the mirrored node. >> >> When a given node B wants to provide egress node A protection, it >> advertises a segment identifying node's A context. Such segment is >> called "Mirror Context Segment" and identified by the Mirror SID. >> >> The Mirror SID is advertised using the Binding Segment defined in SR >> IGP protocol extensions ( [I-D.ietf-isis-segment-routing-extensions], >> [I-D.ietf-ospf-segment-routing-extensions] and >> [I-D.ietf-ospf-ospfv3-segment-routing-extensions]). >> >> In the event of a failure, a point of local repair (PLR) diverting >> traffic from A to B does a PUSH of the Mirror SID on the protected >> traffic. B, when receiving the traffic with the Mirror SID as the >> active segment, uses that segment and process underlying segments in >> the context of A. >> >> 6. Multicast >> >> Segment Routing is defined for unicast. The application of the >> source-route concept to Multicast is not in the scope of this >> document. >> >> SB> A reference to BIER might be apropriate since that is the >> SB> conceptually similar. >> >> 7. IANA Considerations >> >> This document does not require any action from IANA. >> >> 8. Security Considerations >> >> Segment Routing is applicable to both MPLS and IPv6 data planes. >> >> SB> Isn't it applicable to any forwarding plane in which an ordered >> SB> list of instructions can be imposed on a packet, at least from >> SB> an architectural perspective. >> >> Filsfils, et al. Expires May 23, 2017 [Page 19] >> >> Internet-Draft Segment Routing November 2016 >> >> >> Segment Routing adds some meta-data on the packet, with the list of >> forwarding path elements (e.g.: nodes, links, services, etc.) that >> the packet must traverse. >> >> SB> Earlier they were instructions, or segments, and it was an ordered list. >> SB> I am trying to figure out if you traverse a service. Either way >> SB> I am struck by the difference between the description here and at >> SB> the front of the document. >> >> >> It has to be noted that the complete >> source routed path may be represented by a single segment. This is >> the case of the Binding SID. >> >> SB> I am not sure what that adds. The important point is to consider the >> SB> vulnerabilities and it is not clear whether BS is an increased vulnerability >> SB> if not it is unclear what it adds to the analysis. >> >> 8.1. MPLS Data Plane >> >> When applied to the MPLS data plane, Segment Routing does not >> introduce any new behavior or any change in the way MPLS data plane >> works. Therefore, from a security standpoint, this document does not >> define any additional mechanism in the MPLS data plane. >> >> SB> Well not quite. One characteristic of MPLS was that the behaviour >> SB> of a label was only known to its peers. If a packet mislanded at >> SB> a node the behaviour was thus completely unpredictable and thus >> SB> had to exploit. MPLS-SR reduces that unpredictability and thus >> SB> add potential exploits that do not exist in the original MPLS design. >> >> SR allows the expression of a source routed path using a single >> segment (the Binding SID). Compared to RSVP-TE which also provides >> explicit routing capability, there are no fundamental differences in >> term of information provided. Both RSVP-TE and Segment Routing may >> express a source routed path using a single segment. >> >> When a path is expressed using a single label, the syntax of the >> meta-data is equivalent between RSVP-TE and SR. >> >> SB> One of the differences is that RSVP actively maintains the path. >> SB> Is there a danger of stale paths being left in an SR network >> SB> and subsequently exploited? >> >> When a source routed path is expressed with a list of segments >> additional meta-data is added to the packet consisting of the source >> routed path the packet must follow expressed as a segment list. >> >> When a path is expressed using a label stack, if one has access to >> the meaning (i.e.: the Forwarding Equivalence Class) of the labels, >> one has the knowledge of the explicit path. For the MPLS data plane, >> as no data plane modification is required, there is no fundamental >> change of capability. Yet, the occurrence of label stacking will >> increase. >> >> SB> The difference is that an actor could construct an explicit path >> SB> in a way that was not possible in regular MPLS. In both cases >> SB> they need to get the packet inside the network, but once inside the >> SB> network they could construct various types of amplification attack >> SB> that are not possible in classic MPLS >> >> From a network protection standpoint, there is an assumed trust model >> such that any node imposing a label stack on a packet is assumed to >> be allowed to do so. This is a significant change compared to plain >> IP offering shortest path routing but not fundamentally different >> compared to existing techniques providing explicit routing capability >> such as RSVP-TE. By default, the explicit routing information MUST >> NOT be leaked through the boundaries of the administered domain. >> Segment Routing extensions that have been defined in various >> protocols, leverage the security mechanisms of these protocols such >> as encryption, authentication, filtering, etc. >> >> In the general case, a segment routing capable router accepts and >> install labels, only if these labels have been previously advertised >> by a trusted source. The received information is validated using >> existing control plane protocols providing authentication and >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 20] >> >> Internet-Draft Segment Routing November 2016 >> >> >> security mechanisms. Segment routing does not define any additional >> security mechanism in existing control plane protocols. >> >> Segment Routing does not introduce signaling between the source and >> the mid points of a source routed path. With SR, the source routed >> path is computed using SIDs previously advertised in the IP control >> plane. Therefore, in addition to filtering and controlled >> advertisement of SIDs at the boundaries of the SR domain, filtering >> in the data plane is also required. Filtering MUST be performed on >> the forwarding plane at the boundaries of the SR domain and may >> require looking at multiple labels/instruction. >> >> For the MPLS data plane, there are no new requirement as the existing >> MPLS architecture already allow such source routing by stacking >> multiple labels. >> >> SB> I think the concern is whether SR make it easier to construct an attack >> SB> given how widely know the labels are in the network compared to >> SB> classic MPLS? >> >> And for security protection, [RFC4381] section 2.4 >> and [RFC5920] section 8.2 already calls for the filtering of MPLS >> packets on trust boundaries. >> >> 8.2. IPv6 Data Plane >> >> When applied to the IPv6 data plane, Segment Routing does introduce >> the Segment Routing Header (SRH, >> [I-D.ietf-6man-segment-routing-header]) which is a type of Routing >> Extension header as defined in [RFC2460]. >> >> The SRH adds some meta-data on the IPv6 packet, with the list of >> forwarding path elements (e.g.: nodes, links, services, etc.) that >> the packet must traverse and that are represented by IPv6 addresses. >> A complete source routed path may be encoded in the packet using a >> single segment (single IPv6 address). >> >> From a network protection standpoint, there is an assumed trust model >> such that any node adding an SRH to the packet is assumed to be >> allowed to do so. >> >> SB> As I understand it there is current debate as to whether adding >> SB> a header to a packet is allowed in the IPv6 architecture. >> >> Therefore, by default, the explicit routing >> information MUST NOT be leaked through the boundaries of the >> administered domain. Segment Routing extensions that have been >> defined in various protocols, leverage the security mechanisms of >> these protocols such as encryption, authentication, filtering, etc. >> >> SB> The worry of course is that the information is so widely known >> SB> in the network that any rogue node can leak this. >> >> In the general case, an SR IPv6 router accepts and install segments >> identifiers (in the form of IPv6 addresses), only if these SIDs are >> advertised by a trusted source. The received information is >> validated using existing control plane protocols providing >> authentication and security mechanisms. Segment routing does not >> define any additional security mechanism in existing control plane >> protocols. >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 21] >> >> Internet-Draft Segment Routing November 2016 >> >> >> In addition, SR domain boundary routers, by default, MUST apply data >> plane filters so to only accept packets whose DA and SRH (if any) >> contain addresses previously advertised as SIDs. >> >> SB> I am wondering how deep the dpi needs to be here? Also don't you need >> SB> to forbid any packet with an SRH from entering the network? >> >> There are a number of security concerns with source routing at the >> IPv6 data plane [RFC5095]. The new IPv6-based segment routing header >> defined in [I-D.ietf-6man-segment-routing-header] and its associated >> security measures address these concerns. >> >> SB> You can only really say that when that draft is an RFC. >> >> The IPv6 Segment Routing >> Header is defined in a way that blind attacks are never possible, >> i.e., attackers will be unable to send source routed packets that get >> successfully processed, without being part of the negations for >> setting up the source routes or being able to eavesdrop legitimate >> source routed packets. In some networks this base level security may >> be complemented with other mechanisms, such as packet filtering, >> cryptographic security, etc. >> >> SB> I am surprised that there are no dataplane invariant aspects to >> SB> the security, and that there are no separate control plane discussion, >> SB> particularly as you are introducing a new control plane to MPLS. >> >> 9. Manageability Considerations >> >> In SR enabled networks, the path the packet takes is encoded in the >> header. As the path is not signaled through a protocol, >> >> SB> Is this true for Binding SID? >> >> OAM >> mechanisms are necessary in order for the network operator to >> validate the effectiveness of a path as well as to check and monitor >> its liveness and performance. >> >> However, it has to be noted that SR >> allows to reduce substantially the number of states in transit nodes >> and hence the number of elements that a transit node has to manage is >> smaller. >> >> SR OAM use cases and requirements for the MPLS data plane are defined >> in [I-D.ietf-spring-oam-usecase] and >> [I-D.ietf-spring-sr-oam-requirement]. OAM procedures for the MPLS >> data plane are defined in [I-D.ietf-mpls-spring-lsp-ping]. >> >> SR routers receive advertisement of SIDs (index, label or IPv6 >> address) from the different routing protocols being extended for SR. >> Each of these protocols have monitoring and troubleshooting >> mechanisms so to provide operation and management functions for IP >> addresses that MUST be extended in order to include troubleshooting >> and monitoring functions of the SID. >> >> SR architecture introduces the usage of global segments. Each global >> segment must be bound to a globally-unique index or address. The >> management of the allocation of such index or address by the operator >> is critical for the network behavior to avoid situations like mis- >> routing. In addition to the allocation policy/tooling that the >> operator will have in place, an implementation SHOULD protect the >> network in case of conflict detection by providing a deterministic >> resolution approach. >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 22] >> >> Internet-Draft Segment Routing November 2016 >> >> >> An operator may implement tools in order to audit the network and >> ensure the good allocation of indexes, SIDs or IP addresses. >> Conflict detection between SIDs, including Mapping Server binding >> SIDs, and their resolution are addressed in >> [I-D.ietf-spring-conflict-resolution]. >> >> SR with the MPLS data plane, can be gracefully introduced in an >> existing LDP [RFC5036] network. This is described in >> [I-D.ietf-spring-segment-routing-ldp-interop]. SR and LDP may also >> inter-work. In this case, the introduction of mapping-server may >> introduce some additional manageability considerations that are >> discussed in [I-D.ietf-spring-segment-routing-ldp-interop]. >> >> When a path is expressed using a a label stack, the occurrence of >> label stacking will increase. A node may want to signal in the >> control plane it's ability in terms of size of the label stack it can >> support. >> >> A YANG data model [RFC6020] for segment routing configuration and >> operations has been defined in [I-D.ietf-spring-sr-yang]. >> >> When Segment Routing is applied to the IPv6 data plane, segments are >> identified through IPv6 addresses. The allocation, management and >> troubleshooting of segment identifiers is no different than the >> existing mechanisms applied to the allocation and management of IPv6 >> addresses. >> >> In the SR over IPv6 data plane context, the allocation of SIDs >> results into the allocation of IPv6 addresses. Therefore, >> management, troubleshooting, monitoring functions are the same as the >> one used for IPv6 addresses. >> >> The control of a source routed path of an IPv6 packet having an SRH >> SHOULD be implemented through the inspection of the packet header and >> more precisely its DA and segment list (in the SRH). The DA of the >> packet gives the active segment address. The segment list in the SRH >> gives the entire path of the packet. The validation of the source >> routed path is done through inspection of DA and SRH present in the >> packet header matched to the equivalent routing table entries. >> >> In the context of SR over the IPv6 data plane, the source routed path >> is encoded in the SRH as described in >> [I-D.ietf-6man-segment-routing-header]. The SR IPv6 source routed >> path is instantiated into the SRH as a list of IPv6 address where the >> active segment is in the Destination Address (DA) field of the IPv6 >> packet header. Typically, by inspecting in any node the packet >> header, it is possible to derive the source routed path it belongs >> to. Similar to the context of SR over MPLS data plane, an >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 23] >> >> Internet-Draft Segment Routing November 2016 >> >> >> implementation may originate path control and monitoring packets >> where the source routed path is inserted in the SRH and where each >> segment of the path inserts in the packet the relevant data in order >> to measure the end to end path and performance. >> >> 10. Contributors >> >> The following people have substantially contributed to the definition >> of the Segment Routing architecture and to the editing of this >> document: >> >> Ahmed Bashandy >> Cisco Systems, Inc. >> Email: bashandy@cisco.com >> >> Martin Horneffer >> Deutsche Telekom >> Email: Martin.Horneffer@telekom.de >> >> Wim Henderickx >> Alcatel-Lucent >> Email: wim.henderickx@alcatel-lucent.com >> >> Jeff Tantsura >> Ericsson >> Email: Jeff.Tantsura@ericsson.com >> >> Edward Crabbe >> Individual >> Email: edward.crabbe@gmail.com >> >> Igor Milojevic >> Email: milojevicigor@gmail.com >> >> Saku Ytti >> TDC >> Email: saku@ytti.fi >> >> 11. Acknowledgements >> >> We would like to thank Dave Ward, Dan Frost, Stewart Bryant, Pierre >> Francois, Thomas Telkamp, Les Ginsberg, Ruediger Geib, Hannes >> Gredler, Pushpasis Sarkar, Eric Rosen and Chris Bowers for their >> comments and review of this document. >> >> >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 24] >> >> Internet-Draft Segment Routing November 2016 >> >> >> 12. References >> >> 12.1. Normative References >> >> [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate >> Requirement Levels", BCP 14, RFC 2119, >> DOI 10.17487/RFC2119, March 1997, >> . >> >> [RFC2460] Deering, S. and R. Hinden, "Internet Protocol, Version 6 >> (IPv6) Specification", RFC 2460, DOI 10.17487/RFC2460, >> December 1998, . >> >> [RFC3031] Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol >> Label Switching Architecture", RFC 3031, >> DOI 10.17487/RFC3031, January 2001, >> . >> >> [RFC4206] Kompella, K. and Y. Rekhter, "Label Switched Paths (LSP) >> Hierarchy with Generalized Multi-Protocol Label Switching >> (GMPLS) Traffic Engineering (TE)", RFC 4206, >> DOI 10.17487/RFC4206, October 2005, >> . >> >> 12.2. Informative References >> >> SB> It is unclear to me whether or not many of these references are truely >> SB> informative. It seems that in many cases the architectural description >> SB> is so scant that the reader cannot fully understand elements of the >> SB> the architecture without reading some of these references, and that >> SB> makes them normative. >> >> [I-D.filsfils-spring-large-scale-interconnect] >> Filsfils, C., Cai, D., Previdi, S., Henderickx, W., >> Cooper, D., Ferguson, F., Laberge, T., Lin, S., Decraene, >> B., Jalil, L., jefftant@gmail.com, j., and R. Shakir, >> "Interconnecting Millions Of Endpoints With Segment >> Routing", draft-filsfils-spring-large-scale- >> interconnect-04 (work in progress), October 2016. >> >> [I-D.francois-rtgwg-segment-routing-ti-lfa] >> Francois, P., Bashandy, A., and C. Filsfils, "Abstract", >> draft-francois-rtgwg-segment-routing-ti-lfa-02 (work in >> progress), November 2016. >> >> [I-D.ietf-6man-segment-routing-header] >> Previdi, S., Filsfils, C., Field, B., Leung, I., Linkova, >> J., Aries, E., Kosugi, T., Vyncke, E., and D. Lebrun, >> "IPv6 Segment Routing Header (SRH)", draft-ietf-6man- >> segment-routing-header-02 (work in progress), September >> 2016. >> >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 25] >> >> Internet-Draft Segment Routing November 2016 >> >> >> [I-D.ietf-isis-segment-routing-extensions] >> Previdi, S., Filsfils, C., Bashandy, A., Gredler, H., >> Litkowski, S., Decraene, B., and j. jefftant@gmail.com, >> "IS-IS Extensions for Segment Routing", draft-ietf-isis- >> segment-routing-extensions-09 (work in progress), October >> 2016. >> >> [I-D.ietf-mpls-spring-lsp-ping] >> Kumar, N., Swallow, G., Pignataro, C., Akiya, N., Kini, >> S., Gredler, H., and M. Chen, "Label Switched Path (LSP) >> Ping/Trace for Segment Routing Networks Using MPLS >> Dataplane", draft-ietf-mpls-spring-lsp-ping-01 (work in >> progress), October 2016. >> >> [I-D.ietf-ospf-ospfv3-segment-routing-extensions] >> Psenak, P., Previdi, S., Filsfils, C., Gredler, H., >> Shakir, R., Henderickx, W., and J. Tantsura, "OSPFv3 >> Extensions for Segment Routing", draft-ietf-ospf-ospfv3- >> segment-routing-extensions-07 (work in progress), October >> 2016. >> >> [I-D.ietf-ospf-segment-routing-extensions] >> Psenak, P., Previdi, S., Filsfils, C., Gredler, H., >> Shakir, R., Henderickx, W., and J. Tantsura, "OSPF >> Extensions for Segment Routing", draft-ietf-ospf-segment- >> routing-extensions-10 (work in progress), October 2016. >> >> [I-D.ietf-pce-segment-routing] >> Sivabalan, S., Medved, J., Filsfils, C., Crabbe, E., >> Raszuk, R., Lopez, V., Tantsura, J., Henderickx, W., and >> J. Hardwick, "PCEP Extensions for Segment Routing", draft- >> ietf-pce-segment-routing-08 (work in progress), October >> 2016. >> >> [I-D.ietf-spring-conflict-resolution] >> Ginsberg, L., Psenak, P., Previdi, S., and M. Pilka, >> "Segment Routing Conflict Resolution", draft-ietf-spring- >> conflict-resolution-02 (work in progress), October 2016. >> >> [I-D.ietf-spring-ipv6-use-cases] >> Brzozowski, J., Leddy, J., Townsley, W., Filsfils, C., and >> R. Maglione, "IPv6 SPRING Use Cases", draft-ietf-spring- >> ipv6-use-cases-07 (work in progress), July 2016. >> >> >> >> >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 26] >> >> Internet-Draft Segment Routing November 2016 >> >> >> [I-D.ietf-spring-oam-usecase] >> Geib, R., Filsfils, C., Pignataro, C., and N. Kumar, "A >> Scalable and Topology-Aware MPLS Dataplane Monitoring >> System", draft-ietf-spring-oam-usecase-04 (work in >> progress), October 2016. >> >> [I-D.ietf-spring-resiliency-use-cases] >> Filsfils, C., Previdi, S., Decraene, B., and R. Shakir, >> "Resiliency use cases in SPRING networks", draft-ietf- >> spring-resiliency-use-cases-08 (work in progress), October >> 2016. >> >> [I-D.ietf-spring-segment-routing-central-epe] >> Filsfils, C., Previdi, S., Aries, E., Ginsburg, D., and D. >> Afanasiev, "Segment Routing Centralized BGP Peer >> Engineering", draft-ietf-spring-segment-routing-central- >> epe-02 (work in progress), September 2016. >> >> [I-D.ietf-spring-segment-routing-ldp-interop] >> Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., and >> S. Litkowski, "Segment Routing interworking with LDP", >> draft-ietf-spring-segment-routing-ldp-interop-04 (work in >> progress), July 2016. >> >> [I-D.ietf-spring-segment-routing-mpls] >> Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., >> Litkowski, S., Horneffer, M., Shakir, R., >> jefftant@gmail.com, j., and E. Crabbe, "Segment Routing >> with MPLS data plane", draft-ietf-spring-segment-routing- >> mpls-05 (work in progress), July 2016. >> >> [I-D.ietf-spring-segment-routing-msdc] >> Filsfils, C., Previdi, S., Mitchell, J., Aries, E., and P. >> Lapukhov, "BGP-Prefix Segment in large-scale data >> centers", draft-ietf-spring-segment-routing-msdc-02 (work >> in progress), October 2016. >> >> [I-D.ietf-spring-sr-oam-requirement] >> Kumar, N., Pignataro, C., Akiya, N., Geib, R., Mirsky, G., >> and S. Litkowski, "OAM Requirements for Segment Routing >> Network", draft-ietf-spring-sr-oam-requirement-02 (work in >> progress), July 2016. >> >> [I-D.ietf-spring-sr-yang] >> Litkowski, S., Qu, Y., Sarkar, P., and J. Tantsura, "YANG >> Data Model for Segment Routing", draft-ietf-spring-sr- >> yang-05 (work in progress), October 2016. >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 27] >> >> Internet-Draft Segment Routing November 2016 >> >> >> [RFC4381] Behringer, M., "Analysis of the Security of BGP/MPLS IP >> Virtual Private Networks (VPNs)", RFC 4381, >> DOI 10.17487/RFC4381, February 2006, >> . >> >> [RFC4915] Psenak, P., Mirtorabi, S., Roy, A., Nguyen, L., and P. >> Pillay-Esnault, "Multi-Topology (MT) Routing in OSPF", >> RFC 4915, DOI 10.17487/RFC4915, June 2007, >> . >> >> [RFC5036] Andersson, L., Ed., Minei, I., Ed., and B. Thomas, Ed., >> "LDP Specification", RFC 5036, DOI 10.17487/RFC5036, >> October 2007, . >> >> [RFC5095] Abley, J., Savola, P., and G. Neville-Neil, "Deprecation >> of Type 0 Routing Headers in IPv6", RFC 5095, >> DOI 10.17487/RFC5095, December 2007, >> . >> >> [RFC5120] Przygienda, T., Shen, N., and N. Sheth, "M-ISIS: Multi >> Topology (MT) Routing in Intermediate System to >> Intermediate Systems (IS-ISs)", RFC 5120, >> DOI 10.17487/RFC5120, February 2008, >> . >> >> [RFC5920] Fang, L., Ed., "Security Framework for MPLS and GMPLS >> Networks", RFC 5920, DOI 10.17487/RFC5920, July 2010, >> . >> >> [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for >> the Network Configuration Protocol (NETCONF)", RFC 6020, >> DOI 10.17487/RFC6020, October 2010, >> . >> >> [RFC6549] Lindem, A., Roy, A., and S. Mirtorabi, "OSPFv2 Multi- >> Instance Extensions", RFC 6549, DOI 10.17487/RFC6549, >> March 2012, . >> >> [RFC6822] Previdi, S., Ed., Ginsberg, L., Shand, M., Roy, A., and D. >> Ward, "IS-IS Multi-Instance", RFC 6822, >> DOI 10.17487/RFC6822, December 2012, >> . >> >> [RFC7794] Ginsberg, L., Ed., Decraene, B., Previdi, S., Xu, X., and >> U. Chunduri, "IS-IS Prefix Attributes for Extended IPv4 >> and IPv6 Reachability", RFC 7794, DOI 10.17487/RFC7794, >> March 2016, . >> >> >> >> >> Filsfils, et al. Expires May 23, 2017 [Page 28] >> >> Internet-Draft Segment Routing November 2016 >> >> >> [RFC7855] Previdi, S., Ed., Filsfils, C., Ed., Decraene, B., >> Litkowski, S., Horneffer, M., and R. Shakir, "Source >> Packet Routing in Networking (SPRING) Problem Statement >> and Requirements", RFC 7855, DOI 10.17487/RFC7855, May >> 2016, . >> >> Authors' Addresses >> >> Clarence Filsfils (editor) >> Cisco Systems, Inc. >> Brussels >> BE >> >> Email: cfilsfil@cisco.com >> >> >> Stefano Previdi (editor) >> Cisco Systems, Inc. >> Via Del Serafico, 200 >> Rome 00142 >> Italy >> >> Email: sprevidi@cisco.com >> >> >> Bruno Decraene >> Orange >> FR >> >> Email: bruno.decraene@orange.com >> >> >> Stephane Litkowski >> Orange >> FR >> >> Email: stephane.litkowski@orange.com >> >> >> Rob Shakir >> Google, Inc. >> 1600 Amphitheatre Parkway >> Mountain View, CA 94043 >> >> Email: robjs@google.com >> >> >> >> >> >> >> Filsfils, et al. 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