From nobody Tue Jan 6 17:54:05 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 21E951A889D for ; Tue, 6 Jan 2015 17:54:03 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.497 X-Spam-Level: X-Spam-Status: No, score=0.497 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_JP=1.244, HOST_EQ_JP=1.265, J_CHICKENPOX_27=0.6, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=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 LmbM24O1LFbG for ; Tue, 6 Jan 2015 17:54:01 -0800 (PST) Received: from tama50.ecl.ntt.co.jp (tama50.ecl.ntt.co.jp [129.60.39.147]) by ietfa.amsl.com (Postfix) with ESMTP id DDA041A889B for ; Tue, 6 Jan 2015 17:54:00 -0800 (PST) Received: from vc1.ecl.ntt.co.jp (vc1.ecl.ntt.co.jp [129.60.86.153]) by tama50.ecl.ntt.co.jp (8.13.8/8.13.8) with ESMTP id t071s0bO019483 for ; Wed, 7 Jan 2015 10:54:00 +0900 Received: from vc1.ecl.ntt.co.jp (localhost [127.0.0.1]) by vc1.ecl.ntt.co.jp (Postfix) with ESMTP id D8A2A5F612 for ; Wed, 7 Jan 2015 10:53:59 +0900 (JST) Received: from imail1.m.ecl.ntt.co.jp (imail1.m.ecl.ntt.co.jp [129.60.5.246]) by vc1.ecl.ntt.co.jp (Postfix) with ESMTP id C7B1E5F593 for ; Wed, 7 Jan 2015 10:53:59 +0900 (JST) Received: from [129.60.21.195] (neba-hp-shiomoto.silab.ecl.ntt.co.jp [129.60.21.195]) by imail1.m.ecl.ntt.co.jp (8.13.8/8.13.8) with ESMTP id t071rxsH019646 for ; Wed, 7 Jan 2015 10:53:59 +0900 Message-ID: <54AC926F.1030000@lab.ntt.co.jp> Date: Wed, 07 Jan 2015 10:57:03 +0900 From: Kohei Shiomoto User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: spring@ietf.org Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-MML: disable Archived-At: http://mailarchive.ietf.org/arch/msg/spring/ytZqcxAMF9dKj_wEhWIGc-nd-is Subject: [spring] Call for Presentation: iPOP 2015 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 07 Jan 2015 01:54:03 -0000 [Apologies, if you receive multiple copies of this CFP] --------------------------------------- Call for Presentation 11th International Conference on IP + Optical Network (iPOP 2015) April 20-22, 2015 Okinawa Jichikaikan, Naha Okinawa Japan http://www.pilab.jp/ipop2015/ Important Dates: Submission deadline of one-page abstract: January 16, 2015 Notification of acceptance: February 23, 2015 Submission deadline of final presentation slides: March 13, 2015 Following the successful events of iPOP, the 11th Conference on IP+Optical Network (iPOP 2015) will be held at Okinawa Jichikaikan, Naha Okinawa Japan, April 20-22, 2015. The conference has been provided opportunities for both of the industry and the academia to share their knowledge, new findings, and experiences on the state-of-the-art IP and optical networking technologies for these ten years. The Technical Program Committee for iPOP 2015 is soliciting presentation proposals for this conference. Architecture and protocol designs, experiments/PoCs/field trials, theories/algorithms, implementations, and operational experiences are solicited. The topics of the conference will include but not be limited to the following: * Control plane (MPLS/GMPLS, OpenFlow, etc) * SDN for packet and optical transport networks * MLN (Multi-Layer Network), MRN (Multi-Region Network) * TE (Traffic Engineering), PCE (Path Computation Element) * Network abstraction/virtualization * Flex-grid, elastic optical networks * Optical networking/switching for cloud services * Data center and WAN orchestration * Carrier Ethernet and MPLS-TP for backhauling * Service function chaining for mobile networks * Security * QoS (Quality of Service)/QoE (Quality of Experience) * Network operation and management * Standardization/interoperability * Open Source Software (OSS) for SDN/NFV * DevOps Submit an extended abstract (400 words, 1 page), including figures and diagrams, speaker’s name, affiliation, and contact information, to the Technical Program Committee: ipop2015-cfp@pilab.jp. Please see http://www.pilab.jp/ipop2015/ for more details. ------------------------------------------------------------------------ -- Kohei Shiomoto, Ph.D Senior Manager, Communication Traffic & Service Quality Project NTT Network Technology Laboratories NIPPON TELEGRAPH AND TELEPHONE CORPORATION TEL +81-422-59-4402 FAX +81-422-59-6364 From nobody Mon Jan 12 00:18:29 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 51DB81A8A78 for ; Mon, 12 Jan 2015 00:18:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham 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 mN6E2pPMwZHr for ; Mon, 12 Jan 2015 00:18:25 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias91.francetelecom.com [193.251.215.91]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D64531A8A77 for ; Mon, 12 Jan 2015 00:18:23 -0800 (PST) Received: from omfedm06.si.francetelecom.fr (unknown [xx.xx.xx.2]) by omfedm13.si.francetelecom.fr (ESMTP service) with ESMTP id 07D2632432E for ; Mon, 12 Jan 2015 09:18:22 +0100 (CET) Received: from Exchangemail-eme2.itn.ftgroup (unknown [10.114.31.30]) by omfedm06.si.francetelecom.fr (ESMTP service) with ESMTP id DADA927C0A2 for ; Mon, 12 Jan 2015 09:18:21 +0100 (CET) Received: from OPEXCLILM34.corporate.adroot.infra.ftgroup ([169.254.4.232]) by OPEXCLILH02.corporate.adroot.infra.ftgroup ([10.114.31.30]) with mapi id 14.03.0224.002; Mon, 12 Jan 2015 09:18:20 +0100 From: To: "spring@ietf.org" Thread-Topic: Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoA== Date: Mon, 12 Jan 2015 08:18:20 +0000 Message-ID: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.5] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.202419 Archived-At: Subject: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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<18651_1421050415_54B3822F_18651_14831_1_9E32478DFA9976438E7A22F69B08FF920C76D265@OPEXCLILM34.corporate.adroot.infra.ftgroup> <53C29892C857584299CBF5D05346208A0EB01975@PEXCVZYM11.corporate.adroot.infra.ftgroup> In-Reply-To: <53C29892C857584299CBF5D05346208A0EB01975@PEXCVZYM11.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.5] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.16.112421 Archived-At: Cc: "ospf@ietf.org" , "spring@ietf.org" , "draft-ietf-ospf-segment-routing-extensions@tools.ietf.org" , "isis-wg@ietf.org" , "draft-ietf-isis-segment-routing-extensions@tools.ietf.org" Subject: Re: [spring] [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 12 Jan 2015 08:55:04 -0000 SGkgQnJ1bm8sDQoNClVzaW5nIFRUTCBtYXkgd29yayBvciBub3QuIEJhY2t1cCBwYXRoIGRvZXMg bm90IG1lYW4gdGhhdCB5b3Ugd2lsbCBkZWZhY3RvIGhhdmUgbW9yZSBob3BzLiBNZXRyaWMgb2Yg YmFja3VwIHBhdGggY291bGQgYmUgaGlnaGVyIGJ1dCBudW1iZXIgb2YgaG9wcyBlcXVhbCBvciBz bWFsbGVyLg0KDQpJIGNyZWF0ZWQgYSBuZXcgdGhyZWFkIG9uIFNQUklORyBXRyBsaXN0IHRvIGRp c2N1c3MgdGhlIGRpZmZlcmVudCBvcHRpb25zLg0KDQpUaGFua3MgIQ0KDQotLS0tLU9yaWdpbmFs IE1lc3NhZ2UtLS0tLQ0KRnJvbTogREVDUkFFTkUgQnJ1bm8gSU1UL09MTiANClNlbnQ6IE1vbmRh eSwgSmFudWFyeSAxMiwgMjAxNSAwOTo0OQ0KVG86IExJVEtPV1NLSSBTdGVwaGFuZSBTQ0UvSUJO RjsgUm9iIFNoYWtpcg0KQ2M6IGlzaXMtd2dAaWV0Zi5vcmc7IGRyYWZ0LWlldGYtb3NwZi1zZWdt ZW50LXJvdXRpbmctZXh0ZW5zaW9uc0B0b29scy5pZXRmLm9yZzsgb3NwZkBpZXRmLm9yZzsgZHJh ZnQtaWV0Zi1pc2lzLXNlZ21lbnQtcm91dGluZy1leHRlbnNpb25zQHRvb2xzLmlldGYub3JnDQpT dWJqZWN0OiBSRTogW09TUEZdIFtJc2lzLXdnXSBNYWlsIHJlZ2FyZGluZyBkcmFmdC1pZXRmLW9z 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(relais-ias92.francetelecom.com [193.251.215.92]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E54351A8AB4; Mon, 12 Jan 2015 02:41:07 -0800 (PST) Received: from omfedm06.si.francetelecom.fr (unknown [xx.xx.xx.2]) by omfedm13.si.francetelecom.fr (ESMTP service) with ESMTP id EE84E324316; Mon, 12 Jan 2015 11:41:05 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.186]) by omfedm06.si.francetelecom.fr (ESMTP service) with ESMTP id C247B27C071; Mon, 12 Jan 2015 11:41:05 +0100 (CET) Received: from PEXCVZYM11.corporate.adroot.infra.ftgroup ([fe80::a441:e6a9:6143:6f0f]) by PEXCVZYH01.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0224.002; Mon, 12 Jan 2015 11:41:04 +0100 From: To: LITKOWSKI Stephane SCE/IBNF Thread-Topic: [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions Thread-Index: AQHQLj+07OS1hA3lWUKOJwpcc171EJy8G+CAgAARysCAABJFUA== Date: Mon, 12 Jan 2015 10:41:03 +0000 Message-ID: <21321_1421059265_54B3A4C1_21321_4788_1_72c8ebba-539c-4d63-b438-801786dfd989@PEXCVZYH01.corporate.adroot.infra.ftgroup> References: <28823_1420641858_54AD4642_28823_8441_1_9E32478DFA9976438E7A22F69B08FF920C765C15@OPEXCLILM34.corporate.adroot.infra.ftgroup> <1868F3A4-A4E2-4504-A749-582305FA31B4@rob.sh> <18651_1421050415_54B3822F_18651_14831_1_9E32478DFA9976438E7A22F69B08FF920C76D265@OPEXCLILM34.corporate.adroot.infra.ftgroup> <53C29892C857584299CBF5D05346208A0EB01975@PEXCVZYM11.corporate.adroot.infra.ftgroup> <9E32478DFA9976438E7A22F69B08FF920C76D353@OPEXCLILM34.corporate.adroot.infra.ftgroup> In-Reply-To: <9E32478DFA9976438E7A22F69B08FF920C76D353@OPEXCLILM34.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: [10.197.38.2] Content-Type: multipart/alternative; boundary="_000_72c8ebba539c4d63b438801786dfd989PEXCVZYH01corporateadro_" MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.202419 Archived-At: Cc: "spring@ietf.org" , "isis-wg@ietf.org" , "draft-ietf-ospf-segment-routing-extensions@tools.ietf.org" , "ospf@ietf.org" , "draft-ietf-isis-segment-routing-extensions@tools.ietf.org" , Rob Shakir Subject: Re: [spring] [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Mail regarding draft-ietf-ospf-segment-routing-extensions Thread-Index: AQHQLj+19rH0/A1Xy0ObHnHUPdPr+5y8G+CAgAARysCAAB57gA== Date: Mon, 12 Jan 2015 10:44:31 +0000 Message-ID: References: <28823_1420641858_54AD4642_28823_8441_1_9E32478DFA9976438E7A22F69B08FF920C765C15@OPEXCLILM34.corporate.adroot.infra.ftgroup> <1868F3A4-A4E2-4504-A749-582305FA31B4@rob.sh> <18651_1421050415_54B3822F_18651_14831_1_9E32478DFA9976438E7A22F69B08FF920C76D265@OPEXCLILM34.corporate.adroot.infra.ftgroup> <53C29892C857584299CBF5D05346208A0EB01975@PEXCVZYM11.corporate.adroot.infra.ftgroup> <21149_1421052896_54B38BE0_21149_1085_1_86923dca-49c3-4745-881c-116ec27cb9f2@OPEXCLILH02.corporate.adroot.infra.ftgroup> In-Reply-To: <21149_1421052896_54B38BE0_21149_1085_1_86923dca-49c3-4745-881c-116ec27cb9f2@OPEXCLILH02.corporate.adroot.infra.ftgroup> Accept-Language: nl-BE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.4.7.141117 x-originating-ip: [135.239.27.40] 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dHRhY2htZW50cyBtYXkgY29udGFpbiBjb25maWRlbnRpYWwgb3IgcHJpdmlsZWdlZCANCj5pbmZv cm1hdGlvbiB0aGF0IG1heSBiZSBwcm90ZWN0ZWQgYnkgbGF3Ow0KPnRoZXkgc2hvdWxkIG5vdCBi ZSBkaXN0cmlidXRlZCwgdXNlZCBvciBjb3BpZWQgd2l0aG91dCBhdXRob3Jpc2F0aW9uLg0KPklm IHlvdSBoYXZlIHJlY2VpdmVkIHRoaXMgZW1haWwgaW4gZXJyb3IsIHBsZWFzZSBub3RpZnkgdGhl IHNlbmRlciBhbmQgDQo+ZGVsZXRlIHRoaXMgbWVzc2FnZSBhbmQgaXRzIGF0dGFjaG1lbnRzLg0K PkFzIGVtYWlscyBtYXkgYmUgYWx0ZXJlZCwgT3JhbmdlIGlzIG5vdCBsaWFibGUgZm9yIG1lc3Nh Z2VzIHRoYXQgaGF2ZSANCj5iZWVuIG1vZGlmaWVkLCBjaGFuZ2VkIG9yIGZhbHNpZmllZC4NCj5U aGFuayB5b3UuDQo+DQo+X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX18NCj5PU1BGIG1haWxpbmcgbGlzdA0KPk9TUEZAaWV0Zi5vcmcNCj5odHRwczovL3d3dy5p ZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL29zcGYNCg0K From nobody Mon Jan 12 02:54:13 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 756EA1A8ABF; Mon, 12 Jan 2015 02:53:55 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<18651_1421050415_54B3822F_18651_14831_1_9E32478DFA9976438E7A22F69B08FF920C76D265@OPEXCLILM34.corporate.adroot.infra.ftgroup> <53C29892C857584299CBF5D05346208A0EB01975@PEXCVZYM11.corporate.adroot.infra.ftgroup> <21149_1421052896_54B38BE0_21149_1085_1_86923dca-49c3-4745-881c-116ec27cb9f2@OPEXCLILH02.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.5] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.201820 Archived-At: Cc: "ospf@ietf.org" , "spring@ietf.org" , "draft-ietf-ospf-segment-routing-extensions@tools.ietf.org" , "isis-wg@ietf.org" , "draft-ietf-isis-segment-routing-extensions@tools.ietf.org" Subject: Re: [spring] [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 12 Jan 2015 10:53:55 -0000 VmVyeSBnb29kIHBvaW50LCBpbiBvdXIgY2FzZSwgdG9kYXkgd2UgaGF2ZSB1cCB0byAxNSBzdHJp Y3QgaG9wcyBmb3IgVEUgdHVubmVscy4NCldoZW4gd2Ugd2lsbCBpbnRyb2R1Y2UgaW50ZXJkb21h aW4sIGl0IHdpbGwgYnJpbmcgbW9yZS4NCg0KLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCkZy b206IEhlbmRlcmlja3gsIFdpbSAoV2ltKSBbbWFpbHRvOndpbS5oZW5kZXJpY2t4QGFsY2F0ZWwt bHVjZW50LmNvbV0gDQpTZW50OiBNb25kYXksIEphbnVhcnkgMTIsIDIwMTUgMTE6NDUNClRvOiBM SVRLT1dTS0kgU3RlcGhhbmUgU0NFL0lCTkY7IERFQ1JBRU5FIEJydW5vIElNVC9PTE47IFJvYiBT aGFraXINCkNjOiBvc3BmQGlldGYub3JnOyBzcHJpbmdAaWV0Zi5vcmc7IGRyYWZ0LWlldGYtb3Nw Zi1zZWdtZW50LXJvdXRpbmctZXh0ZW5zaW9uc0B0b29scy5pZXRmLm9yZzsgaXNpcy13Z0BpZXRm Lm9yZzsgZHJhZnQtaWV0Zi1pc2lzLXNlZ21lbnQtcm91dGluZy1leHRlbnNpb25zQHRvb2xzLmll dGYub3JnDQpTdWJqZWN0OiBSZTogW09TUEZdIFtJc2lzLXdnXSBNYWlsIHJlZ2FyZGluZyBkcmFm dC1pZXRmLW9zcGYtc2VnbWVudC1yb3V0aW5nLWV4dGVuc2lvbnMNCg0KSG93IG1hbnkgaG9wcyBk 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aGF2ZSByZWNlaXZlZCB0aGlzIGVtYWlsIGluIGVycm9yLCBwbGVhc2Ugbm90aWZ5IHRoZSBzZW5k ZXIgYW5kIGRlbGV0ZSB0aGlzIG1lc3NhZ2UgYW5kIGl0cyBhdHRhY2htZW50cy4KQXMgZW1haWxz IG1heSBiZSBhbHRlcmVkLCBPcmFuZ2UgaXMgbm90IGxpYWJsZSBmb3IgbWVzc2FnZXMgdGhhdCBo YXZlIGJlZW4gbW9kaWZpZWQsIGNoYW5nZWQgb3IgZmFsc2lmaWVkLgpUaGFuayB5b3UuCgo= From nobody Mon Jan 12 07:13:29 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D20721AC3AB; Mon, 12 Jan 2015 07:13:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.61 X-Spam-Level: X-Spam-Status: No, score=-4.61 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, MANGLED_BEEF=2.3, RCVD_IN_DNSWL_HI=-5, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 HqOJYVCpO9Ka; Mon, 12 Jan 2015 07:13:16 -0800 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"stephane.litkowski@orange.com" , "DECRAENE Bruno IMT/OLN" , Rob Shakir Thread-Topic: [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions Thread-Index: AQHQLj+19rH0/A1Xy0ObHnHUPdPr+5y8G+CAgAARysCAAB57gP//8qQAgABZPQA= Date: Mon, 12 Jan 2015 15:13:12 +0000 Message-ID: References: <28823_1420641858_54AD4642_28823_8441_1_9E32478DFA9976438E7A22F69B08FF920C765C15@OPEXCLILM34.corporate.adroot.infra.ftgroup> <1868F3A4-A4E2-4504-A749-582305FA31B4@rob.sh> <18651_1421050415_54B3822F_18651_14831_1_9E32478DFA9976438E7A22F69B08FF920C76D265@OPEXCLILM34.corporate.adroot.infra.ftgroup> <53C29892C857584299CBF5D05346208A0EB01975@PEXCVZYM11.corporate.adroot.infra.ftgroup> <21149_1421052896_54B38BE0_21149_1085_1_86923dca-49c3-4745-881c-116ec27cb9f2@OPEXCLILH02.corporate.adroot.infra.ftgroup> <13987_1421060024_54B3A7B8_13987_19542_1_3b33983a-7671-4df1-a1ac-52b83d8162a0@OPEXCLILH02.corporate.adroot.infra.ftgroup> In-Reply-To: <13987_1421060024_54B3A7B8_13987_19542_1_3b33983a-7671-4df1-a1ac-52b83d8162a0@OPEXCLILH02.corporate.adroot.infra.ftgroup> Accept-Language: nl-BE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.4.7.141117 x-originating-ip: [135.239.27.41] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Cc: "ospf@ietf.org" , "spring@ietf.org" , "draft-ietf-ospf-segment-routing-extensions@tools.ietf.org" , "isis-wg@ietf.org" , "draft-ietf-isis-segment-routing-extensions@tools.ietf.org" Subject: Re: [spring] [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 12 Jan 2015 15:13:24 -0000 SSB1bmRlcnN0YW5kIHRoYXQgY2VydGFpbiB2ZW5kb3JzIHdpbGwgbm90IGVhc2lseSBhY2NvbW1v ZGF0ZSB0aGlzLCBzbyBJDQp1bmRlcnN0YW5kIHdlIG5lZWQgYSBzb2x1dGlvbiBsaWtlIHlvdSBz dWdnZXN0IG9yIHN1cHBvcnQgYSBjb21iaW5hdGlvbiBvZg0KQWRqLVNJRC9Ob2RlLVNJRCBiYXNl ZCBvbiB3aGVyZSB5b3Ugd2FudCB0byBhdm9pZCB0aGUgcmVyb3V0aW5nLg0KDQpPbiAxMi8wMS8x NSAxMTo1MywgInN0ZXBoYW5lLmxpdGtvd3NraUBvcmFuZ2UuY29tIg0KPHN0ZXBoYW5lLmxpdGtv d3NraUBvcmFuZ2UuY29tPiB3cm90ZToNCg0KPlZlcnkgZ29vZCBwb2ludCwgaW4gb3VyIGNhc2Us IHRvZGF5IHdlIGhhdmUgdXAgdG8gMTUgc3RyaWN0IGhvcHMgZm9yIFRFDQo+dHVubmVscy4NCj5X aGVuIHdlIHdpbGwgaW50cm9kdWNlIGludGVyZG9tYWluLCBpdCB3aWxsIGJyaW5nIG1vcmUuDQo+ DQo+LS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj5Gcm9tOiBIZW5kZXJpY2t4LCBXaW0gKFdp bSkgW21haWx0bzp3aW0uaGVuZGVyaWNreEBhbGNhdGVsLWx1Y2VudC5jb21dDQo+U2VudDogTW9u ZGF5LCBKYW51YXJ5IDEyLCAyMDE1IDExOjQ1DQo+VG86IExJVEtPV1NLSSBTdGVwaGFuZSBTQ0Uv 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[127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4D8A21A8ADA for ; Tue, 13 Jan 2015 05:33:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 N96TzgycsaQf for ; Tue, 13 Jan 2015 05:33:33 -0800 (PST) Received: from cappuccino.rob.sh (cappuccino.rob.sh [IPv6:2a03:9800:10:4c::cafe:b00c]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 568591A8ADD for ; Tue, 13 Jan 2015 05:33:31 -0800 (PST) Received: from [109.144.222.231] (helo=[10.0.4.35]) by cappuccino.rob.sh with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1YB1b8-0002jw-3Z; Tue, 13 Jan 2015 13:33:30 +0000 Mime-Version: 1.0 (Mac OS X Mail 8.1 \(1993\)) Content-Type: text/plain; charset=utf-8 From: Rob Shakir In-Reply-To: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> Date: Tue, 13 Jan 2015 13:33:26 +0000 Content-Transfer-Encoding: quoted-printable Message-Id: <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> To: stephane.litkowski@orange.com X-Mailer: Apple Mail (2.1993) Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 13 Jan 2015 13:33:37 -0000 Hi Stephane, Thanks for kicking off this discussion =E2=80=94 it=E2=80=99s one that = we have had a few conversations around. > On 12 Jan 2015, at 08:18, stephane.litkowski@orange.com wrote: >=20 > [=E2=80=A6 snip =E2=80=A6] >=20 > Now, as I explained, IMO, it's possible to introduce end to end OAM on = top on the SRTE to bring the LSP down as soon as there s something wrong = on the path. A Holddown timer can be used to keep LSP down until = convergence happens at Ingress or Controller. But introducing such OAM = and holddown and coupled with relations with IGP may also be complex and = there is a chance that it does not solve the issue. In case of protected = NodeSID used, OAM will not work, because switchover time will be too = small. Using OAM , defacto requires path with no protection. > So unprotected SID+OAM may solve the use at the price of some = complexity and possibly not solving 100% of the cases. I agree here - either the switchover time is very small, and hence we = cannot detect anything with connectivity verification OAM, and doing = anything that measures the performance does not guarantee that we have = strict affinity to the original path (the post-convergence and = protection paths may be within the same performance constraints). So, = no-protection and OAM is not a good way to ensure that we have strict = affinity. >=20 > To conclude : > We need to solve this use case and we need to find another elegant, = simple and scalable solution for this. >=20 > Possible existing solutions : > - Use Adj-SID only =3D> does not sounds good as there will be an = impact of stack depth =3D> Path compression necessary Stack compression is only really required today because we have hardware = that has never needed the stack depths that we=E2=80=99re talking about = currently. Going forward, if SPRING-TE/SR-TE/AdjSID stacks are popular = as a solution, then I see no reason that we MUST always have path = compression. It is simply that this isn=E2=80=99t a dimension that = we=E2=80=99ve asked our hardware colleagues to optimise for currently = IMHO. I=E2=80=99m interested if you=E2=80=99ve a different view? > - Use binding TLV and create some new Node-SID corresponding to a set = of Adj-SID =3D> This introduces more states within the network (how many = ?) How many is a question that depends on the network, and the constraints = that one places - since this tells you what the AdjSID stack size can = be. In some cases, it can be worse than the network diameter, because = the constraints may require it. To this end, we can do some analysis to = see whether we can determine the number of Binding-TLVs that are going = to be required, and then subsequently, figure out how such SID-expansion = bindings are created (by PCE, manually by operator?)... > - Anything else ? Nothing else comes to mind from me at the moment. Would be interested to = hear whether there are other views within the WG. r. >=20 > Best regards, >=20 > Stephane >=20 >=20 > -----Original Message----- > From: Rob Shakir [mailto:rjs@rob.sh] > Sent: Thursday, January 08, 2015 10:52 > To: LITKOWSKI Stephane SCE/IBNF > Cc: Les Ginsberg (ginsberg); Shraddha Hegde; Pushpasis Sarkar; Peter = Psenak (ppsenak); = draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; = draft-ietf-isis-segment-routing-extensions@tools.ietf.org; Hannes = Gredler; ospf@ietf.org; isis-wg@ietf.org > Subject: Re: [Isis-wg] [OSPF] Mail regarding = draft-ietf-ospf-segment-routing-extensions >=20 > Stephane, >=20 > If we think about the =E2=80=9CMUST NOT be protected=E2=80=9D case = that you mention. Let=E2=80=99s assume that we have a service that is = performance sensitive, such that we want to take a particular path = through the network - and that we use Node-SIDs like you say. >=20 > If we assume that the requirement is for A-B-C-D-E path below. The = node SID for E points via C-D-E and hence is used for stack compression = like you say: >=20 > A -- B -- C -- D -- E > | / > --- Q --- >=20 > In your envisaged behaviour, C does not protect the Node-SID for E. In = the case of the C-D link failure, then the =E2=80=9Cpreferred=E2=80=9D = behaviour is that C now drops traffic towards this destination. However, = C does not remove the FIB entry for the Node-SID for E, it=E2=80=99s = actually just now known via Q. At this point, A can forward with exactly = the same stack, and the packet takes a new A-B-C-Q-E path, which is = non-conformant with the performance requirement of the service. >=20 > In terms of what C does with its FIB, does it simply not use C-Q-E = during the failure, but post-reconvergence use it anyway? If so, why not = use C-Q-E during the failure - because the service is always going to = non-conformant to the performance requirement? >=20 > With an Adj-SID, it makes sense, because essentially unless that = adjacency is available, then there is no alternate path for the SID that = will be taken - so traffic never hits a non-conformant path. >=20 > Practically, if I can=E2=80=99t tell a customer that the path taken = will definitely be A-B-C-D-E, and it may rather go via C-Q-E at some = point following convergence [until the head-end calculates that such a = change had happened - either a link outage, or a metric change - and = stops using the label stack], then there=E2=80=99s little problem of = having the traffic go via C-Q-E during protection. >=20 > For the disjoint case, the consideration that one has to make is: > * are alternative SPF paths for a particular Node-SID actually = still conformant with the disjointness requirement? How many = simultaneous failures does one require to violate constraints. For = example, in a dual-plane core network, then if the requirement is = disjointness at the IP level, then we may need to lose connectivity = entirely within the plane before it is preferable to =E2=80=9Chop=E2=80=9D= to another plane. In this case, using an alternative SPF path for the = Node-SID is actually not a problem for disjointness. > * does the application prefer losing an entire path to having = some risk of the services being shared fate until the re-optimisation?=20= >=20 > =46rom the work that we=E2=80=99ve looked at thus far, I have not yet = seen a case where I absolutely MUST NOT use an alternate shortest path = for a Node-SID and hence don=E2=80=99t require protection at a practical = level. >=20 > Stack depth is definitely going to be something that we need to = consider - to me, where we have centralised controller - actions such as = dynamically created forwarding-adjacency LSPs which allow = =E2=80=9Cexpansion=E2=80=9D of one segment into a set of segments within = the path are attractive as a solution where one needs to have explicit = routing of traffic for TE purposes.=20 >=20 > Does this make sense, or do you see the use case that we=E2=80=99re = addressing here differently? >=20 > Cheers, > r. >=20 >=20 >> On 7 Jan 2015, at 09:44, stephane.litkowski@orange.com wrote: >>=20 >> Hi, >>=20 >> I'm coming into this long thread and I tried to read all the exchange=20= >> but I may be missed some lines :) >>=20 >> But here is my opinion on this subject. >> I think the point from Shradda is valuable in case of Traffic = Engineering with Segment Routing, especially with a central controller. >>=20 >> Today in TE networks, we are selling some disjoints paths to customer = that MUST NOT be protected (SDH like services). It would be good to = reproduce the same thing with SR-TE. >>=20 >> Now, current encoding permits to advertise that a specific Adj-SID is = protected or not (as already mentioned, this does not say that a = protection really exists ..., in case of LFA protection , there may be = no FRR path for this adj-SID despite of the protection flag set). >> We pretty know that it would not be possible in all case to use only = Adj-SID for a TE tunnel (due to label stack depth), so we need to = introduce stack compression using SPT segments and node-SID. >> So to reply on Rob's comment, on RSVP-TE tunnels with looses hops = that does not request protection : yes for RSVP, it does not make sense = to me, but for SR, due to stack compression, it will be needed. >>=20 >> If we look at a network, where TE is managed by a central controller, = how the controller can ensure that the node-SID used is protected or not = (as for Adj-SID, I mean protection requested, not protection installed). = I see two ways : >> * Use two SIDs attached to the same prefix and add a flag to = prevent automatically all nodes to compute a protection for one of the = SID. The flag does not really force nodes to compute a protection. Each = node will still require local configuration for protection, but the flag = will permit to exclude some prefixes for protection (overriding local = policy). >>=20 >> * Use two prefixes on each node , prefixes are marked with tags = (admin-tags) : "protection tag" and "non protection tag". Each router is = configured using LFA policies to not compute protection for prefixes = having "non protection tag" AND add knowledge to the controller to use = only "non protection tag" prefixes to compress non protected path. >>=20 >>=20 >> Best Regards, >>=20 >> Stephane >>=20 >=20 > = __________________________________________________________________________= _______________________________________________ >=20 > 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. >=20 > 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. >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Tue Jan 13 06:11:40 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D63BC1A8ABF for ; Tue, 13 Jan 2015 06:11:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 yGHAOkOWz1d3 for ; Tue, 13 Jan 2015 06:11:32 -0800 (PST) Received: from cappuccino.rob.sh (cappuccino.rob.sh [IPv6:2a03:9800:10:4c::cafe:b00c]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9DCDF1A8AE2 for ; Tue, 13 Jan 2015 06:11:30 -0800 (PST) Received: from [109.144.222.231] (helo=[10.0.4.35]) by cappuccino.rob.sh with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1YB2Bs-0002s0-GS; Tue, 13 Jan 2015 14:11:28 +0000 Mime-Version: 1.0 (Mac OS X Mail 8.1 \(1993\)) Content-Type: text/plain; charset=utf-8 From: Rob Shakir In-Reply-To: <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> Date: Tue, 13 Jan 2015 14:11:26 +0000 Content-Transfer-Encoding: quoted-printable Message-Id: References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> To: stephane.litkowski@orange.com X-Mailer: Apple Mail (2.1993) Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 13 Jan 2015 14:11:38 -0000 Apologies, someone pointed out an error in my email =E2=80=94 thanks! > On 13 Jan 2015, at 13:33, Rob Shakir wrote: >=20 > Hi Stephane, >=20 > Thanks for kicking off this discussion =E2=80=94 it=E2=80=99s one that = we have had a few conversations around. >=20 >> On 12 Jan 2015, at 08:18, stephane.litkowski@orange.com wrote: >>=20 >> [=E2=80=A6 snip =E2=80=A6] >>=20 >> Now, as I explained, IMO, it's possible to introduce end to end OAM = on top on the SRTE to bring the LSP down as soon as there s something = wrong on the path. A Holddown timer can be used to keep LSP down until = convergence happens at Ingress or Controller. But introducing such OAM = and holddown and coupled with relations with IGP may also be complex and = there is a chance that it does not solve the issue. In case of protected = NodeSID used, OAM will not work, because switchover time will be too = small. Using OAM , defacto requires path with no protection. >> So unprotected SID+OAM may solve the use at the price of some = complexity and possibly not solving 100% of the cases. >=20 > I agree here Apologies, I disagree that SID+OAM is a reasonable solution here. r. > - either the switchover time is very small, and hence we cannot detect = anything with connectivity verification OAM, and doing anything that = measures the performance does not guarantee that we have strict affinity = to the original path (the post-convergence and protection paths may be = within the same performance constraints). So, no-protection and OAM is = not a good way to ensure that we have strict affinity. >=20 >>=20 >> To conclude : >> We need to solve this use case and we need to find another elegant, = simple and scalable solution for this. >>=20 >> Possible existing solutions : >> - Use Adj-SID only =3D> does not sounds good as there will be an = impact of stack depth =3D> Path compression necessary >=20 > Stack compression is only really required today because we have = hardware that has never needed the stack depths that we=E2=80=99re = talking about currently. Going forward, if SPRING-TE/SR-TE/AdjSID stacks = are popular as a solution, then I see no reason that we MUST always have = path compression. It is simply that this isn=E2=80=99t a dimension that = we=E2=80=99ve asked our hardware colleagues to optimise for currently = IMHO. I=E2=80=99m interested if you=E2=80=99ve a different view? >=20 >> - Use binding TLV and create some new Node-SID corresponding to a set = of Adj-SID =3D> This introduces more states within the network (how many = ?) >=20 > How many is a question that depends on the network, and the = constraints that one places - since this tells you what the AdjSID stack = size can be. In some cases, it can be worse than the network diameter, = because the constraints may require it. To this end, we can do some = analysis to see whether we can determine the number of Binding-TLVs that = are going to be required, and then subsequently, figure out how such = SID-expansion bindings are created (by PCE, manually by operator?)... >=20 >> - Anything else ? >=20 > Nothing else comes to mind from me at the moment. Would be interested = to hear whether there are other views within the WG. >=20 > r. >=20 >>=20 >> Best regards, >>=20 >> Stephane >>=20 >>=20 >> -----Original Message----- >> From: Rob Shakir [mailto:rjs@rob.sh] >> Sent: Thursday, January 08, 2015 10:52 >> To: LITKOWSKI Stephane SCE/IBNF >> Cc: Les Ginsberg (ginsberg); Shraddha Hegde; Pushpasis Sarkar; Peter = Psenak (ppsenak); = draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; = draft-ietf-isis-segment-routing-extensions@tools.ietf.org; Hannes = Gredler; ospf@ietf.org; isis-wg@ietf.org >> Subject: Re: [Isis-wg] [OSPF] Mail regarding = draft-ietf-ospf-segment-routing-extensions >>=20 >> Stephane, >>=20 >> If we think about the =E2=80=9CMUST NOT be protected=E2=80=9D case = that you mention. Let=E2=80=99s assume that we have a service that is = performance sensitive, such that we want to take a particular path = through the network - and that we use Node-SIDs like you say. >>=20 >> If we assume that the requirement is for A-B-C-D-E path below. The = node SID for E points via C-D-E and hence is used for stack compression = like you say: >>=20 >> A -- B -- C -- D -- E >> | / >> --- Q --- >>=20 >> In your envisaged behaviour, C does not protect the Node-SID for E. = In the case of the C-D link failure, then the =E2=80=9Cpreferred=E2=80=9D = behaviour is that C now drops traffic towards this destination. However, = C does not remove the FIB entry for the Node-SID for E, it=E2=80=99s = actually just now known via Q. At this point, A can forward with exactly = the same stack, and the packet takes a new A-B-C-Q-E path, which is = non-conformant with the performance requirement of the service. >>=20 >> In terms of what C does with its FIB, does it simply not use C-Q-E = during the failure, but post-reconvergence use it anyway? If so, why not = use C-Q-E during the failure - because the service is always going to = non-conformant to the performance requirement? >>=20 >> With an Adj-SID, it makes sense, because essentially unless that = adjacency is available, then there is no alternate path for the SID that = will be taken - so traffic never hits a non-conformant path. >>=20 >> Practically, if I can=E2=80=99t tell a customer that the path taken = will definitely be A-B-C-D-E, and it may rather go via C-Q-E at some = point following convergence [until the head-end calculates that such a = change had happened - either a link outage, or a metric change - and = stops using the label stack], then there=E2=80=99s little problem of = having the traffic go via C-Q-E during protection. >>=20 >> For the disjoint case, the consideration that one has to make is: >> * are alternative SPF paths for a particular Node-SID actually = still conformant with the disjointness requirement? How many = simultaneous failures does one require to violate constraints. For = example, in a dual-plane core network, then if the requirement is = disjointness at the IP level, then we may need to lose connectivity = entirely within the plane before it is preferable to =E2=80=9Chop=E2=80=9D= to another plane. In this case, using an alternative SPF path for the = Node-SID is actually not a problem for disjointness. >> * does the application prefer losing an entire path to having = some risk of the services being shared fate until the re-optimisation?=20= >>=20 >> =46rom the work that we=E2=80=99ve looked at thus far, I have not yet = seen a case where I absolutely MUST NOT use an alternate shortest path = for a Node-SID and hence don=E2=80=99t require protection at a practical = level. >>=20 >> Stack depth is definitely going to be something that we need to = consider - to me, where we have centralised controller - actions such as = dynamically created forwarding-adjacency LSPs which allow = =E2=80=9Cexpansion=E2=80=9D of one segment into a set of segments within = the path are attractive as a solution where one needs to have explicit = routing of traffic for TE purposes.=20 >>=20 >> Does this make sense, or do you see the use case that we=E2=80=99re = addressing here differently? >>=20 >> Cheers, >> r. >>=20 >>=20 >>> On 7 Jan 2015, at 09:44, stephane.litkowski@orange.com wrote: >>>=20 >>> Hi, >>>=20 >>> I'm coming into this long thread and I tried to read all the = exchange=20 >>> but I may be missed some lines :) >>>=20 >>> But here is my opinion on this subject. >>> I think the point from Shradda is valuable in case of Traffic = Engineering with Segment Routing, especially with a central controller. >>>=20 >>> Today in TE networks, we are selling some disjoints paths to = customer that MUST NOT be protected (SDH like services). It would be = good to reproduce the same thing with SR-TE. >>>=20 >>> Now, current encoding permits to advertise that a specific Adj-SID = is protected or not (as already mentioned, this does not say that a = protection really exists ..., in case of LFA protection , there may be = no FRR path for this adj-SID despite of the protection flag set). >>> We pretty know that it would not be possible in all case to use only = Adj-SID for a TE tunnel (due to label stack depth), so we need to = introduce stack compression using SPT segments and node-SID. >>> So to reply on Rob's comment, on RSVP-TE tunnels with looses hops = that does not request protection : yes for RSVP, it does not make sense = to me, but for SR, due to stack compression, it will be needed. >>>=20 >>> If we look at a network, where TE is managed by a central = controller, how the controller can ensure that the node-SID used is = protected or not (as for Adj-SID, I mean protection requested, not = protection installed). I see two ways : >>> * Use two SIDs attached to the same prefix and add a flag to = prevent automatically all nodes to compute a protection for one of the = SID. The flag does not really force nodes to compute a protection. Each = node will still require local configuration for protection, but the flag = will permit to exclude some prefixes for protection (overriding local = policy). >>>=20 >>> * Use two prefixes on each node , prefixes are marked with tags = (admin-tags) : "protection tag" and "non protection tag". Each router is = configured using LFA policies to not compute protection for prefixes = having "non protection tag" AND add knowledge to the controller to use = only "non protection tag" prefixes to compress non protected path. >>>=20 >>>=20 >>> Best Regards, >>>=20 >>> Stephane >>>=20 >>=20 >> = __________________________________________________________________________= _______________________________________________ >>=20 >> 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. >>=20 >> 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. >>=20 >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Tue Jan 13 10:59:16 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9EFE51A9112 for ; Tue, 13 Jan 2015 10:59:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -104.201 X-Spam-Level: X-Spam-Status: No, score=-104.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, USER_IN_WHITELIST=-100] autolearn=ham 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 FG0eQyU2IMS5 for ; Tue, 13 Jan 2015 10:59:12 -0800 (PST) Received: from usevmg20.ericsson.net (usevmg20.ericsson.net [198.24.6.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F0C711A9118 for ; Tue, 13 Jan 2015 10:59:11 -0800 (PST) X-AuditID: c618062d-f79376d000000ceb-e1-54b518d34069 Received: from EUSAAHC001.ericsson.se (Unknown_Domain [147.117.188.75]) by usevmg20.ericsson.net (Symantec Mail Security) with SMTP id 3B.4B.03307.4D815B45; Tue, 13 Jan 2015 14:08:36 +0100 (CET) Received: from EUSAAMB103.ericsson.se ([147.117.188.120]) by EUSAAHC001.ericsson.se ([147.117.188.75]) with mapi id 14.03.0195.001; Tue, 13 Jan 2015 13:59:03 -0500 From: Gregory Mirsky To: "stephane.litkowski@orange.com" , "spring@ietf.org" Thread-Topic: Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoABH15Aw Date: Tue, 13 Jan 2015 18:59:03 +0000 Message-ID: <7347100B5761DC41A166AC17F22DF1121B8D1189@eusaamb103.ericsson.se> References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> In-Reply-To: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.117.188.9] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrELMWRmVeSWpSXmKPExsUyuXSPt+4Via0hBts/SVscv/Cb0eLr3oes DkweS5b8ZPJoeXaSLYApissmJTUnsyy1SN8ugStj+1mWgjOVFRv2TWJtYNxT1sXIySEhYCKx Yc5zRghbTOLCvfVsXYxcHEICRxglXt3dzAThLGeUWPtlNhtIFZuAkcSLjT3sILaIQJbEzk+X wWxhAUOJa0cvANkcQHEjid6lGTDmjRd2IBUsAqoSqy7fZgaxeQV8JVbPXcIIMb6TUeLDlCdg izkFuhglrhy/ywRSxQh00fdTa8BsZgFxiVtP5jNBXCogsWTPeWYIW1Ti5eN/rBC2osS+/ulg NzALaEqs36UP0aooMaX7ITvEYkGJkzOfsExgFJ2FZOoshI5ZSDpmIelYwMiyipGjtDi1LDfd yGATIzASjkmw6e5g3PPS8hCjAAejEg/vBsktIUKsiWXFlbmHGKU5WJTEeVverQ8REkhPLEnN Tk0tSC2KLyrNSS0+xMjEwSnVwJj0T8mkqngz25mJbxieP/m5a+mXu1NvnhBfkG46UbhUvzD7 2CPhwoL0M3xm7Fzbb6u+U40TjrJdMSvbZumc7klt7utXO09KM58qIitokDEjaIrthcDPy558 +/G38dnv2PgY0/+7tmzgCOQOlsqdtX+PO0e2/b3Cd+vkDEL3Tz7pV1Bd/MUr7LsSS3FGoqEW c1FxIgCbEPIsZQIAAA== Archived-At: Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 13 Jan 2015 18:59:15 -0000 SGkgU3RlcGhhbmUsIGV0LiBhbCwNCnZlcnkgaW50ZXJlc3RpbmcgdG9waWMuIFBsZWFzZSBmaW5k IG15IHF1ZXN0aW9ucywgbm90ZXMgaW4tbGluZWQgYW5kIHRhZ2dlZCBHSU0+Pi4NCg0KCVJlZ2Fy ZHMsDQoJCUdyZWcNCg0KLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCkZyb206IHNwcmluZyBb bWFpbHRvOnNwcmluZy1ib3VuY2VzQGlldGYub3JnXSBPbiBCZWhhbGYgT2Ygc3RlcGhhbmUubGl0 a293c2tpQG9yYW5nZS5jb20NClNlbnQ6IE1vbmRheSwgSmFudWFyeSAxMiwgMjAxNSAxMjoxOCBB TQ0KVG86IHNwcmluZ0BpZXRmLm9yZw0KU3ViamVjdDogW3NwcmluZ10gUHJvdmlkaW5nIHVucHJv dGVjdGVkIFNQUklORyBURSBwYXRoDQoNCkkgdGhpbmsgaXQgd291bGQgYmUgZ29vZCB0byBkaXNj dXNzIHRoaXMgdG9waWMgd2l0aGluIFNQUklORyBXRy4NCg0KLS0tLS1PcmlnaW5hbCBNZXNzYWdl LS0tLS0NCkZyb206IE9TUEYgW21haWx0bzpvc3BmLWJvdW5jZXNAaWV0Zi5vcmddIE9uIEJlaGFs ZiBPZiBzdGVwaGFuZS5saXRrb3dza2lAb3JhbmdlLmNvbQ0KU2VudDogTW9uZGF5LCBKYW51YXJ5 IDEyLCAyMDE1IDA5OjE0DQpUbzogUm9iIFNoYWtpcg0KQ2M6IGlzaXMtd2dAaWV0Zi5vcmc7IGRy 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DQpJZiB5b3UgaGF2ZSByZWNlaXZlZCB0aGlzIGVtYWlsIGluIGVycm9yLCBwbGVhc2Ugbm90aWZ5 IHRoZSBzZW5kZXIgYW5kIGRlbGV0ZSB0aGlzIG1lc3NhZ2UgYW5kIGl0cyBhdHRhY2htZW50cy4N CkFzIGVtYWlscyBtYXkgYmUgYWx0ZXJlZCwgT3JhbmdlIGlzIG5vdCBsaWFibGUgZm9yIG1lc3Nh Z2VzIHRoYXQgaGF2ZSBiZWVuIG1vZGlmaWVkLCBjaGFuZ2VkIG9yIGZhbHNpZmllZC4NClRoYW5r IHlvdS4NCg0KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18N CnNwcmluZyBtYWlsaW5nIGxpc3QNCnNwcmluZ0BpZXRmLm9yZw0KaHR0cHM6Ly93d3cuaWV0Zi5v cmcvbWFpbG1hbi9saXN0aW5mby9zcHJpbmcNCg== From nobody Tue Jan 13 19:12:49 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D05231A89FA for ; Tue, 13 Jan 2015 19:12:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -114.511 X-Spam-Level: X-Spam-Status: No, score=-114.511 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, 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(nobo)" To: Rob Shakir , "stephane.litkowski@orange.com" Thread-Topic: [spring] Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoABJ3x8AAAFTvwAACu+C4A== Date: Wed, 14 Jan 2015 03:12:40 +0000 Message-ID: References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.24.11.136] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 14 Jan 2015 03:12:47 -0000 SGVsbG8gU3RlcGhhbmUsIFJvYiwgZXQgYWwsDQoNClRoYW5rcyBmb3IgaW5pdGlhdGluZyB0aGlz IHZlcnkgaW50ZXJlc3RpbmcgZGlzY3Vzc2lvbi4NCg0KUGxlYXNlIHNlZSBpbi1saW5lIGZvciBv bmUgY29tbWVudCBhbmQgb25lIHBvc3NpYmxlIGFsdGVybmF0aXZlLg0KDQo+IC0tLS0tT3JpZ2lu YWwgTWVzc2FnZS0tLS0tDQo+IEZyb206IHNwcmluZyBbbWFpbHRvOnNwcmluZy1ib3VuY2VzQGll dGYub3JnXSBPbiBCZWhhbGYgT2YgUm9iIFNoYWtpcg0KPiBTZW50OiBUdWVzZGF5LCBKYW51YXJ5 IDEzLCAyMDE1IDk6MTEgQU0NCj4gVG86IHN0ZXBoYW5lLmxpdGtvd3NraUBvcmFuZ2UuY29tDQo+ IENjOiBzcHJpbmdAaWV0Zi5vcmcNCj4gU3ViamVjdDogUmU6IFtzcHJpbmddIFByb3ZpZGluZyB1 bnByb3RlY3RlZCBTUFJJTkcgVEUgcGF0aA0KPiANCj4gQXBvbG9naWVzLCBzb21lb25lIHBvaW50 ZWQgb3V0IGFuIGVycm9yIGluIG15IGVtYWlsIOKAlCB0aGFua3MhDQo+IA0KPiA+IE9uIDEzIEph biAyMDE1LCBhdCAxMzozMywgUm9iIFNoYWtpciA8cmpzQHJvYi5zaD4gd3JvdGU6DQo+ID4NCj4g PiBIaSBTdGVwaGFuZSwNCj4gPg0KPiA+IFRoYW5rcyBmb3Iga2lja2luZyBvZmYgdGhpcyBkaXNj 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(xhc-aln-x07.cisco.com [173.36.12.81]) by alln-core-8.cisco.com (8.14.5/8.14.5) with ESMTP id t0E4o1GC026232 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 14 Jan 2015 04:50:04 GMT Received: from xmb-rcd-x03.cisco.com ([169.254.7.219]) by xhc-aln-x07.cisco.com ([173.36.12.81]) with mapi id 14.03.0195.001; Tue, 13 Jan 2015 22:50:01 -0600 From: "Nagendra Kumar Nainar (naikumar)" To: "Nobo Akiya (nobo)" , Rob Shakir , "stephane.litkowski@orange.com" Thread-Topic: [spring] Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoABJ3x8AAAFTvwAACu+C4AAJRbqA Date: Wed, 14 Jan 2015 04:50:00 +0000 Message-ID: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.8.130913 x-originating-ip: [10.82.210.235] Content-Type: text/plain; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 14 Jan 2015 04:50:11 -0000 Hi Nobo, Do you mean, set the TTL of SBFD session from A to C as 2? (depending on the hops). I am not sure if that will help. Assume (in your topology) the metric between B and C is 10 and A want to avoid link BC. So the normal path from A to D is A-B-E-F-D and using Node SID D is sufficient to take the path that satisfy the constraint. In this case, I think relying on TTL may not help as on B if link BE fails, it redirects over lesser TTL path. -Nagendra On 1/13/15, 10:12 PM, "Nobo Akiya (nobo)" wrote: >Hello Stephane, Rob, et al, > >Thanks for initiating this very interesting discussion. > >Please see in-line for one comment and one possible alternative. > >> -----Original Message----- >> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Rob Shakir >> Sent: Tuesday, January 13, 2015 9:11 AM >> To: stephane.litkowski@orange.com >> Cc: spring@ietf.org >> Subject: Re: [spring] Providing unprotected SPRING TE path >>=20 >> Apologies, someone pointed out an error in my email =8B thanks! >>=20 >> > On 13 Jan 2015, at 13:33, Rob Shakir wrote: >> > >> > Hi Stephane, >> > >> > Thanks for kicking off this discussion =8B it=B9s one that we have had= a >>few >> conversations around. >> > >> >> On 12 Jan 2015, at 08:18, stephane.litkowski@orange.com wrote: >> >> >> >> [=8A snip =8A] >> >> >> >> Now, as I explained, IMO, it's possible to introduce end to end OAM >>on >> top on the SRTE to bring the LSP down as soon as there s something wrong >> on the path. A Holddown timer can be used to keep LSP down until >> convergence happens at Ingress or Controller. But introducing such OAM >> and holddown and coupled with relations with IGP may also be complex and >> there is a chance that it does not solve the issue. In case of protected >> NodeSID used, OAM will not work, because switchover time will be too >> small. Using OAM , defacto requires path with no protection. >> >> So unprotected SID+OAM may solve the use at the price of some >> complexity and possibly not solving 100% of the cases. >> > >> > I agree here >>=20 >> Apologies, I disagree that SID+OAM is a reasonable solution here. > >[NOBO] I agree that end to end OAM (i.e., continuity check) will be >difficult, as there will be a race condition between local protection(s) >and the end to end OAM declaring the failure. > >>=20 >> r. >>=20 >> > - either the switchover time is very small, and hence we cannot detect >> anything with connectivity verification OAM, and doing anything that >> measures the performance does not guarantee that we have strict affinity >> to the original path (the post-convergence and protection paths may be >> within the same performance constraints). So, no-protection and OAM is >> not a good way to ensure that we have strict affinity. >> > >> >> >> >> To conclude : >> >> We need to solve this use case and we need to find another elegant, >> simple and scalable solution for this. >> >> >> >> Possible existing solutions : >> >> - Use Adj-SID only =3D> does not sounds good as there will be an impa= ct >> >> of stack depth =3D> Path compression necessary >> > >> > Stack compression is only really required today because we have >> hardware that has never needed the stack depths that we=B9re talking abo= ut >> currently. Going forward, if SPRING-TE/SR-TE/AdjSID stacks are popular >>as a >> solution, then I see no reason that we MUST always have path >>compression. >> It is simply that this isn=B9t a dimension that we=B9ve asked our hardwa= re >> colleagues to optimise for currently IMHO. I=B9m interested if you=B9ve = a >> different view? >> > >> >> - Use binding TLV and create some new Node-SID corresponding to a set >> >> of Adj-SID =3D> This introduces more states within the network (how >> >> many ?) >> > >> > How many is a question that depends on the network, and the >>constraints >> that one places - since this tells you what the AdjSID stack size can >>be. In >> some cases, it can be worse than the network diameter, because the >> constraints may require it. To this end, we can do some analysis to see >> whether we can determine the number of Binding-TLVs that are going to be >> required, and then subsequently, figure out how such SID-expansion >> bindings are created (by PCE, manually by operator?)... >> > >> >> - Anything else ? >> > >> > Nothing else comes to mind from me at the moment. Would be interested >> to hear whether there are other views within the WG. > >[NOBO] If I assume one condition, then there is another possibility. > >The assumption is that if there is a parallel link between a pair of >nodes, then the SRTE will be: >- using an Adj-SID on that hop, or >- using a Node-SID to traverse that hop but don't care which link is >traversed > >If above assumption is reasonable, then the requirements to OAM seem to >be that: >(1) N-th hop of a Node-SID forwarding MUST traverses a certain node. >(2) An SRTE MAY have multiple instances of (1). > >For example: > >A----B----C----D > | | > E----F > >Node A has SRTE that consists of Node-SID D but need to ensure that >A-B-C-D is traversed. > >Node A can create an end to end OAM to monitor the reachability to D. > >Additionally, Node A can create an S-BFD session to Node C with specific >TTL. "your discriminator" of such S-BFD packet guarantees that Node A >only gets the response as long as the packet is terminating on Node C. >When Node B triggers a local protection or [re]convergence causes the >packet to traverse A-B-E-F-C-D, then Node A can deterministically detect >this and can take a necessary action (e.g., fall back to the backup LSP >or re-compute a new path). > >Something like that is a possibility with S-BFD. > >Thanks! > >-Nobo > >> > >> > r. >> > >> >> >> >> Best regards, >> >> >> >> Stephane >> >> >> >> >> >> -----Original Message----- >> >> From: Rob Shakir [mailto:rjs@rob.sh] >> >> Sent: Thursday, January 08, 2015 10:52 >> >> To: LITKOWSKI Stephane SCE/IBNF >> >> Cc: Les Ginsberg (ginsberg); Shraddha Hegde; Pushpasis Sarkar; Peter >> >> Psenak (ppsenak); >> >> draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; >> >> draft-ietf-isis-segment-routing-extensions@tools.ietf.org; Hannes >> >> Gredler; ospf@ietf.org; isis-wg@ietf.org >> >> Subject: Re: [Isis-wg] [OSPF] Mail regarding >> >> draft-ietf-ospf-segment-routing-extensions >> >> >> >> Stephane, >> >> >> >> If we think about the =B3MUST NOT be protected=B2 case that you menti= on. >> Let=B9s assume that we have a service that is performance sensitive, suc= h >>that >> we want to take a particular path through the network - and that we use >> Node-SIDs like you say. >> >> >> >> If we assume that the requirement is for A-B-C-D-E path below. The >>node >> SID for E points via C-D-E and hence is used for stack compression like >>you >> say: >> >> >> >> A -- B -- C -- D -- E >> >> | / >> >> --- Q --- >> >> >> >> In your envisaged behaviour, C does not protect the Node-SID for E. >>In >> the case of the C-D link failure, then the =B3preferred=B2 behaviour is >>that C now >> drops traffic towards this destination. However, C does not remove the >>FIB >> entry for the Node-SID for E, it=B9s actually just now known via Q. At >>this point, >> A can forward with exactly the same stack, and the packet takes a new >>A-B- >> C-Q-E path, which is non-conformant with the performance requirement of >> the service. >> >> >> >> In terms of what C does with its FIB, does it simply not use C-Q-E >>during >> the failure, but post-reconvergence use it anyway? If so, why not use >>C-Q-E >> during the failure - because the service is always going to >>non-conformant >> to the performance requirement? >> >> >> >> With an Adj-SID, it makes sense, because essentially unless that >> adjacency is available, then there is no alternate path for the SID >>that will be >> taken - so traffic never hits a non-conformant path. >> >> >> >> Practically, if I can=B9t tell a customer that the path taken will >>definitely be >> A-B-C-D-E, and it may rather go via C-Q-E at some point following >> convergence [until the head-end calculates that such a change had >> happened - either a link outage, or a metric change - and stops using >>the >> label stack], then there=B9s little problem of having the traffic go via >>C-Q-E >> during protection. >> >> >> >> For the disjoint case, the consideration that one has to make is: >> >> * are alternative SPF paths for a particular Node-SID actually still >> conformant with the disjointness requirement? How many simultaneous >> failures does one require to violate constraints. For example, in a >>dual- >> plane core network, then if the requirement is disjointness at the IP >>level, >> then we may need to lose connectivity entirely within the plane before >>it is >> preferable to =B3hop=B2 to another plane. In this case, using an >>alternative SPF >> path for the Node-SID is actually not a problem for disjointness. >> >> * does the application prefer losing an entire path to having some >> risk of the services being shared fate until the re-optimisation? >> >> >> >> From the work that we=B9ve looked at thus far, I have not yet seen a >>case >> where I absolutely MUST NOT use an alternate shortest path for a >>Node-SID >> and hence don=B9t require protection at a practical level. >> >> >> >> Stack depth is definitely going to be something that we need to >>consider >> - to me, where we have centralised controller - actions such as >>dynamically >> created forwarding-adjacency LSPs which allow =B3expansion=B2 of one seg= ment >> into a set of segments within the path are attractive as a solution >>where one >> needs to have explicit routing of traffic for TE purposes. >> >> >> >> Does this make sense, or do you see the use case that we=B9re >>addressing >> here differently? >> >> >> >> Cheers, >> >> r. >> >> >> >> >> >>> On 7 Jan 2015, at 09:44, stephane.litkowski@orange.com wrote: >> >>> >> >>> Hi, >> >>> >> >>> I'm coming into this long thread and I tried to read all the >> >>> exchange but I may be missed some lines :) >> >>> >> >>> But here is my opinion on this subject. >> >>> I think the point from Shradda is valuable in case of Traffic >>Engineering >> with Segment Routing, especially with a central controller. >> >>> >> >>> Today in TE networks, we are selling some disjoints paths to >>customer >> that MUST NOT be protected (SDH like services). It would be good to >> reproduce the same thing with SR-TE. >> >>> >> >>> Now, current encoding permits to advertise that a specific Adj-SID >>is >> protected or not (as already mentioned, this does not say that a >>protection >> really exists ..., in case of LFA protection , there may be no FRR path >>for this >> adj-SID despite of the protection flag set). >> >>> We pretty know that it would not be possible in all case to use >>only Adj- >> SID for a TE tunnel (due to label stack depth), so we need to introduce >>stack >> compression using SPT segments and node-SID. >> >>> So to reply on Rob's comment, on RSVP-TE tunnels with looses hops >>that >> does not request protection : yes for RSVP, it does not make sense to >>me, >> but for SR, due to stack compression, it will be needed. >> >>> >> >>> If we look at a network, where TE is managed by a central >>controller, >> how the controller can ensure that the node-SID used is protected or >>not (as >> for Adj-SID, I mean protection requested, not protection installed). I >>see >> two ways : >> >>> * Use two SIDs attached to the same prefix and add a flag to >>prevent >> automatically all nodes to compute a protection for one of the SID. The >>flag >> does not really force nodes to compute a protection. Each node will >>still >> require local configuration for protection, but the flag will permit to >>exclude >> some prefixes for protection (overriding local policy). >> >>> >> >>> * Use two prefixes on each node , prefixes are marked with tags >> (admin-tags) : "protection tag" and "non protection tag". Each router is >> configured using LFA policies to not compute protection for prefixes >>having >> "non protection tag" AND add knowledge to the controller to use only >>"non >> protection tag" prefixes to compress non protected path. >> >>> >> >>> >> >>> Best Regards, >> >>> >> >>> Stephane >> >>> >> >> >> >> >> ___________________________________________________________________ >> __ >> >> ____________________________________________________ >> >> >> >> 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 >>=20 >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring >_______________________________________________ >spring mailing list >spring@ietf.org >https://www.ietf.org/mailman/listinfo/spring From nobody Tue Jan 13 21:58:25 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83FCD1A8870 for ; Tue, 13 Jan 2015 21:58:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -104.2 X-Spam-Level: X-Spam-Status: No, score=-104.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, USER_IN_WHITELIST=-100] autolearn=ham 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 sLz7Zp3Ff-Hn for ; Tue, 13 Jan 2015 21:58:17 -0800 (PST) Received: from usevmg21.ericsson.net (usevmg21.ericsson.net [198.24.6.65]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 127EA1A896C for ; Tue, 13 Jan 2015 21:58:17 -0800 (PST) X-AuditID: c6180641-f79916d00000623a-68-54b5a719e5f2 Received: from EUSAAHC004.ericsson.se (Unknown_Domain [147.117.188.84]) by usevmg21.ericsson.net (Symantec Mail Security) with SMTP id E7.4F.25146.917A5B45; Wed, 14 Jan 2015 00:15:38 +0100 (CET) Received: from EUSAAMB103.ericsson.se ([147.117.188.120]) by EUSAAHC004.ericsson.se ([147.117.188.84]) with mapi id 14.03.0195.001; Wed, 14 Jan 2015 00:58:08 -0500 From: Gregory Mirsky To: "Nobo Akiya (nobo)" , Rob Shakir , "stephane.litkowski@orange.com" Thread-Topic: [spring] Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoABHxq4AAAFTvwAAG0jFAAAFIdRA Date: Wed, 14 Jan 2015 05:58:07 +0000 Message-ID: <7347100B5761DC41A166AC17F22DF1121B8D1681@eusaamb103.ericsson.se> References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.117.188.11] Content-Type: multipart/alternative; boundary="_000_7347100B5761DC41A166AC17F22DF1121B8D1681eusaamb103erics_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuphkeLIzCtJLcpLzFFi42KZXLonRFdq+dYQg5bD6hazO+It2o7vZbM4 fuE3o8XXvQ9ZHVg8pvzeyOqxZMlPJo+WZyfZPJZs3cUWwBLFZZOSmpNZllqkb5fAlfFunmrB sV7milOnXrM3MM5oZu5i5OSQEDCRWH13HTuELSZx4d56ti5GLg4hgSOMEpMv3GKBcJYzSrw+ dwKsik3ASOLFxh52kISIQAujxOZ/nWwgCWYBdYll+y8AdXBwCAtYSTTP5AAJiwhYS+zt38wG YbtJrPm+Cmwzi4CqxJIFB1hBynkFfCWW3VaB2LWGSeLMu3WMIDWcQPHexavA9jICXff91Bom iFXiEreezGeCuFpAYsme81DfiEq8fPyPFcJWkvj4ez47RH2+xLZj18Bu4BUQlDg58wnLBEbR WUhGzUJSNgtJ2Syg85gFNCXW79KHKFGUmNL9kB3C1pBonTOXHVl8ASP7KkaO0uLUstx0I8NN jMDoOybB5riDccEny0OMAhyMSjy8BtlbQ4RYE8uKK3MPMUpzsCiJ80Y8Wh8iJJCeWJKanZpa kFoUX1Sak1p8iJGJg1OqgXHKjpfh6lYr2rZGG2yRuid71O3a1TePfFeXGC44e/vO//9GD/P/ tD9l5rFQNzshcJphiWgxX+Lq12UZl7v2mMVOj49IfvxWY3JUtEnT/IB5S5ScrFZ6u+yJ2Ppw n77QK3bPma2y6Ty3GK7/6UwX1vmuOil0+7Fny+admx1yICd841/v+9mv/q1WYinOSDTUYi4q TgQAX2dW6p8CAAA= Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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"stephane.litkowski@orange.com" Thread-Topic: [spring] Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoAAsiO8AAAFTwAAAG0jFAAARvO8w Date: Wed, 14 Jan 2015 06:08:21 +0000 Message-ID: References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.97.72] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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X19fX19fX19fX19fX19fX19fXw0KPiA+IHNwcmluZyBtYWlsaW5nIGxpc3QNCj4gPiBzcHJpbmdA aWV0Zi5vcmcNCj4gPiBodHRwczovL3d3dy5pZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL3Nwcmlu Zw0KPiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KPiBz cHJpbmcgbWFpbGluZyBsaXN0DQo+IHNwcmluZ0BpZXRmLm9yZw0KPiBodHRwczovL3d3dy5pZXRm Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3NwcmluZw0K From nobody Wed Jan 14 01:26:13 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2E5D21A8ADF for ; Wed, 14 Jan 2015 01:26:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham 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 RJ0DPMs-s8Md for ; Wed, 14 Jan 2015 01:26:03 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias92.francetelecom.com [193.251.215.92]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 460291A89A8 for ; Wed, 14 Jan 2015 01:26:03 -0800 (PST) Received: from omfedm08.si.francetelecom.fr (unknown [xx.xx.xx.4]) by omfedm10.si.francetelecom.fr (ESMTP service) with ESMTP id 6D96F26417B; Wed, 14 Jan 2015 10:26:01 +0100 (CET) Received: from Exchangemail-eme2.itn.ftgroup (unknown [10.114.31.5]) by omfedm08.si.francetelecom.fr (ESMTP service) with ESMTP id 4DB062380AD; Wed, 14 Jan 2015 10:26:01 +0100 (CET) Received: from OPEXCLILM34.corporate.adroot.infra.ftgroup ([169.254.4.232]) by OPEXCLILH01.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0224.002; Wed, 14 Jan 2015 10:26:01 +0100 From: To: Rob Shakir Thread-Topic: [spring] Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoAA7NAcAACuu6QA= Date: Wed, 14 Jan 2015 09:26:00 +0000 Message-ID: <29986_1421227561_54B63629_29986_8957_1_9E32478DFA9976438E7A22F69B08FF920C76F678@OPEXCLILM34.corporate.adroot.infra.ftgroup> References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> In-Reply-To: <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.190922 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 14 Jan 2015 09:26:08 -0000 PiBTdGFjayBjb21wcmVzc2lvbiBpcyBvbmx5IHJlYWxseSByZXF1aXJlZCB0b2RheSBiZWNhdXNl IHdlIGhhdmUgaGFyZHdhcmUgdGhhdCBoYXMgbmV2ZXIgbmVlZGVkIHRoZSBzdGFjayBkZXB0aHMg dGhhdCB3ZeKAmXJlIHRhbGtpbmcgYWJvdXQgY3VycmVudGx5LiBHb2luZyBmb3J3YXJkLCBpZiBT UFJJTkctVEUvU1ItVEUvQWRqU0lEIHN0YWNrcyBhcmUgcG9wdWxhciBhcyBhIHNvbHV0aW9uLCB0 aGVuIEkgc2VlIG5vIHJlYXNvbiB0aGF0IHdlIE1VU1QgYWx3YXlzIGhhdmUgcGF0aCBjb21wcmVz c2lvbi4gSXQgaXMgc2ltcGx5IHRoYXQgdGhpcyBpc27igJl0IGEgZGltZW5zaW9uIHRoYXQgd2Xi gJl2ZSBhc2tlZCBvdXIgaGFyZHdhcmUgY29sbGVhZ3VlcyB0byBvcHRpbWlzZSBmb3IgY3VycmVu dGx5IElNSE8uIEnigJltIGludGVyZXN0ZWQgaWYgeW914oCZdmUgYSBkaWZmZXJlbnQgdmlldz8N Cg0KW1NMSV0gSSBhZ3JlZSwgdGhhdCB0aGlzIGxpbWl0YXRpb24gbWF5IGJlIG91dCBpbiBmdXR1 cmUgKG9yIG5vdCAuLi4gbm8gcmVhbCB2aWV3IHRvZGF5KS4gTm93IHdlIHN0aWxsIG5lZWQgdG8g dGFrZSBjYXJlIGFib3V0IE1UVSwgdGhlcmUgYXJlIHN0aWxsIGxpbmtzIGluIHNvbWUgbmV0d29y 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bGVnZWQgaW5mb3JtYXRpb24gdGhhdCBtYXkgYmUgcHJvdGVjdGVkIGJ5IGxhdzsKdGhleSBzaG91 bGQgbm90IGJlIGRpc3RyaWJ1dGVkLCB1c2VkIG9yIGNvcGllZCB3aXRob3V0IGF1dGhvcmlzYXRp b24uCklmIHlvdSBoYXZlIHJlY2VpdmVkIHRoaXMgZW1haWwgaW4gZXJyb3IsIHBsZWFzZSBub3Rp ZnkgdGhlIHNlbmRlciBhbmQgZGVsZXRlIHRoaXMgbWVzc2FnZSBhbmQgaXRzIGF0dGFjaG1lbnRz LgpBcyBlbWFpbHMgbWF5IGJlIGFsdGVyZWQsIE9yYW5nZSBpcyBub3QgbGlhYmxlIGZvciBtZXNz YWdlcyB0aGF0IGhhdmUgYmVlbiBtb2RpZmllZCwgY2hhbmdlZCBvciBmYWxzaWZpZWQuClRoYW5r IHlvdS4KCg== From nobody Wed Jan 14 01:30:52 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 570051ACE52 for ; Wed, 14 Jan 2015 01:30:49 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, 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([10.114.31.55]) with mapi id 14.03.0224.002; Wed, 14 Jan 2015 10:30:43 +0100 From: To: Gregory Mirsky , "spring@ietf.org" Thread-Topic: Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoABH15AwAB8cM7A= Date: Wed, 14 Jan 2015 09:30:42 +0000 Message-ID: <316_1421227843_54B63743_316_8864_1_9E32478DFA9976438E7A22F69B08FF920C76F68D@OPEXCLILM34.corporate.adroot.infra.ftgroup> References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <7347100B5761DC41A166AC17F22DF1121B8D1189@eusaamb103.ericsson.se> In-Reply-To: <7347100B5761DC41A166AC17F22DF1121B8D1189@eusaamb103.ericsson.se> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.200030 Archived-At: Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 14 Jan 2015 09:30:49 -0000 SGkgR3JlZywNCg0KSW5saW5lIGNvbW1lbnRzDQoNCi0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0t DQpGcm9tOiBHcmVnb3J5IE1pcnNreSBbbWFpbHRvOmdyZWdvcnkubWlyc2t5QGVyaWNzc29uLmNv bV0gDQpTZW50OiBUdWVzZGF5LCBKYW51YXJ5IDEzLCAyMDE1IDE5OjU5DQpUbzogTElUS09XU0tJ IFN0ZXBoYW5lIFNDRS9JQk5GOyBzcHJpbmdAaWV0Zi5vcmcNClN1YmplY3Q6IFJFOiBQcm92aWRp bmcgdW5wcm90ZWN0ZWQgU1BSSU5HIFRFIHBhdGgNCg0KSGkgU3RlcGhhbmUsIGV0LiBhbCwNCnZl cnkgaW50ZXJlc3RpbmcgdG9waWMuIFBsZWFzZSBmaW5kIG15IHF1ZXN0aW9ucywgbm90ZXMgaW4t bGluZWQgYW5kIHRhZ2dlZCBHSU0+Pi4NCg0KCVJlZ2FyZHMsDQoJCUdyZWcNCg0KLS0tLS1Pcmln aW5hbCBNZXNzYWdlLS0tLS0NCkZyb206IHNwcmluZyBbbWFpbHRvOnNwcmluZy1ib3VuY2VzQGll dGYub3JnXSBPbiBCZWhhbGYgT2Ygc3RlcGhhbmUubGl0a293c2tpQG9yYW5nZS5jb20NClNlbnQ6 IE1vbmRheSwgSmFudWFyeSAxMiwgMjAxNSAxMjoxOCBBTQ0KVG86IHNwcmluZ0BpZXRmLm9yZw0K U3ViamVjdDogW3NwcmluZ10gUHJvdmlkaW5nIHVucHJvdGVjdGVkIFNQUklORyBURSBwYXRoDQoN 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[10.114.31.55]) by omfeda07.si.francetelecom.fr (ESMTP service) with ESMTP id E65FE1580EB; Wed, 14 Jan 2015 10:34:36 +0100 (CET) Received: from OPEXCLILM34.corporate.adroot.infra.ftgroup ([169.254.4.232]) by OPEXCLILH03.corporate.adroot.infra.ftgroup ([10.114.31.55]) with mapi id 14.03.0224.002; Wed, 14 Jan 2015 10:34:36 +0100 From: To: "Nagendra Kumar Nainar (naikumar)" , "Nobo Akiya (nobo)" , Rob Shakir Thread-Topic: [spring] Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoAA7NAcAAAFTvwAAG0jFAAADZjsAAAv/ZJA= Date: Wed, 14 Jan 2015 09:34:36 +0000 Message-ID: <5090_1421228077_54B6382C_5090_10940_1_9E32478DFA9976438E7A22F69B08FF920C76F6B4@OPEXCLILM34.corporate.adroot.infra.ftgroup> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: text/plain; charset="windows-1257" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.200030 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 14 Jan 2015 09:34:43 -0000 Hi, I agree with your point Nagendra, TTL cannot be used (Bruno already propose= d such TTL solution on ISIS/OSPF ML). -----Original Message----- From: Nagendra Kumar Nainar (naikumar) [mailto:naikumar@cisco.com]=20 Sent: Wednesday, January 14, 2015 05:50 To: Nobo Akiya (nobo); Rob Shakir; LITKOWSKI Stephane SCE/IBNF Cc: spring@ietf.org Subject: Re: [spring] Providing unprotected SPRING TE path Hi Nobo, Do you mean, set the TTL of SBFD session from A to C as 2? (depending on th= e hops). I am not sure if that will help. Assume (in your topology) the met= ric between B and C is 10 and A want to avoid link BC. So the normal path f= rom A to D is A-B-E-F-D and using Node SID D is sufficient to take the path= that satisfy the constraint. In this case, I think relying on TTL may not = help as on B if link BE fails, it redirects over lesser TTL path. -Nagendra On 1/13/15, 10:12 PM, "Nobo Akiya (nobo)" wrote: >Hello Stephane, Rob, et al, > >Thanks for initiating this very interesting discussion. > >Please see in-line for one comment and one possible alternative. > >> -----Original Message----- >> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Rob Shakir >> Sent: Tuesday, January 13, 2015 9:11 AM >> To: stephane.litkowski@orange.com >> Cc: spring@ietf.org >> Subject: Re: [spring] Providing unprotected SPRING TE path >>=20 >> Apologies, someone pointed out an error in my email =8B thanks! >>=20 >> > On 13 Jan 2015, at 13:33, Rob Shakir wrote: >> > >> > Hi Stephane, >> > >> > Thanks for kicking off this discussion =8B it=B9s one that we have had= =20 >> > a >>few >> conversations around. >> > >> >> On 12 Jan 2015, at 08:18, stephane.litkowski@orange.com wrote: >> >> >> >> [=D0 snip =D0] >> >> >> >> Now, as I explained, IMO, it's possible to introduce end to end=20 >> >> OAM >>on >> top on the SRTE to bring the LSP down as soon as there s something=20 >>wrong on the path. A Holddown timer can be used to keep LSP down=20 >>until convergence happens at Ingress or Controller. But introducing=20 >>such OAM and holddown and coupled with relations with IGP may also be=20 >>complex and there is a chance that it does not solve the issue. In=20 >>case of protected NodeSID used, OAM will not work, because switchover=20 >>time will be too small. Using OAM , defacto requires path with no protec= tion. >> >> So unprotected SID+OAM may solve the use at the price of some >> complexity and possibly not solving 100% of the cases. >> > >> > I agree here >>=20 >> Apologies, I disagree that SID+OAM is a reasonable solution here. > >[NOBO] I agree that end to end OAM (i.e., continuity check) will be=20 >difficult, as there will be a race condition between local=20 >protection(s) and the end to end OAM declaring the failure. > >>=20 >> r. >>=20 >> > - either the switchover time is very small, and hence we cannot=20 >> > detect >> anything with connectivity verification OAM, and doing anything that=20 >> measures the performance does not guarantee that we have strict=20 >> affinity to the original path (the post-convergence and protection=20 >> paths may be within the same performance constraints). So,=20 >> no-protection and OAM is not a good way to ensure that we have strict af= finity. >> > >> >> >> >> To conclude : >> >> We need to solve this use case and we need to find another=20 >> >> elegant, >> simple and scalable solution for this. >> >> >> >> Possible existing solutions : >> >> - Use Adj-SID only =3D> does not sounds good as there will be an=20 >> >> impact of stack depth =3D> Path compression necessary >> > >> > Stack compression is only really required today because we have >> hardware that has never needed the stack depths that we=B9re talking=20 >>about currently. Going forward, if SPRING-TE/SR-TE/AdjSID stacks are=20 >>popular as a solution, then I see no reason that we MUST always have=20 >>path compression. >> It is simply that this isn=B9t a dimension that we=B9ve asked our=20 >>hardware colleagues to optimise for currently IMHO. I=B9m interested if= =20 >>you=B9ve a different view? >> > >> >> - Use binding TLV and create some new Node-SID corresponding to a=20 >> >> set of Adj-SID =3D> This introduces more states within the network=20 >> >> (how many ?) >> > >> > How many is a question that depends on the network, and the >>constraints >> that one places - since this tells you what the AdjSID stack size can=20 >>be. In some cases, it can be worse than the network diameter, because=20 >>the constraints may require it. To this end, we can do some analysis=20 >>to see whether we can determine the number of Binding-TLVs that are=20 >>going to be required, and then subsequently, figure out how such=20 >>SID-expansion bindings are created (by PCE, manually by operator?)... >> > >> >> - Anything else ? >> > >> > Nothing else comes to mind from me at the moment. Would be=20 >> > interested >> to hear whether there are other views within the WG. > >[NOBO] If I assume one condition, then there is another possibility. > >The assumption is that if there is a parallel link between a pair of=20 >nodes, then the SRTE will be: >- using an Adj-SID on that hop, or >- using a Node-SID to traverse that hop but don't care which link is=20 >traversed > >If above assumption is reasonable, then the requirements to OAM seem to=20 >be that: >(1) N-th hop of a Node-SID forwarding MUST traverses a certain node. >(2) An SRTE MAY have multiple instances of (1). > >For example: > >A----B----C----D > | | > E----F > >Node A has SRTE that consists of Node-SID D but need to ensure that=20 >A-B-C-D is traversed. > >Node A can create an end to end OAM to monitor the reachability to D. > >Additionally, Node A can create an S-BFD session to Node C with=20 >specific TTL. "your discriminator" of such S-BFD packet guarantees that=20 >Node A only gets the response as long as the packet is terminating on Nod= e C. >When Node B triggers a local protection or [re]convergence causes the=20 >packet to traverse A-B-E-F-C-D, then Node A can deterministically=20 >detect this and can take a necessary action (e.g., fall back to the=20 >backup LSP or re-compute a new path). > >Something like that is a possibility with S-BFD. > >Thanks! > >-Nobo > >> > >> > r. >> > >> >> >> >> Best regards, >> >> >> >> Stephane >> >> >> >> >> >> -----Original Message----- >> >> From: Rob Shakir [mailto:rjs@rob.sh] >> >> Sent: Thursday, January 08, 2015 10:52 >> >> To: LITKOWSKI Stephane SCE/IBNF >> >> Cc: Les Ginsberg (ginsberg); Shraddha Hegde; Pushpasis Sarkar;=20 >> >> Peter Psenak (ppsenak);=20 >> >> draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; >> >> draft-ietf-isis-segment-routing-extensions@tools.ietf.org; Hannes=20 >> >> Gredler; ospf@ietf.org; isis-wg@ietf.org >> >> Subject: Re: [Isis-wg] [OSPF] Mail regarding=20 >> >> draft-ietf-ospf-segment-routing-extensions >> >> >> >> Stephane, >> >> >> >> If we think about the =B3MUST NOT be protected=B2 case that you menti= on. >> Let=B9s assume that we have a service that is performance sensitive,=20 >>such that we want to take a particular path through the network - and=20 >>that we use Node-SIDs like you say. >> >> >> >> If we assume that the requirement is for A-B-C-D-E path below. The >>node >> SID for E points via C-D-E and hence is used for stack compression=20 >>like you >> say: >> >> >> >> A -- B -- C -- D -- E >> >> | / >> >> --- Q --- >> >> >> >> In your envisaged behaviour, C does not protect the Node-SID for E. >>In >> the case of the C-D link failure, then the =B3preferred=B2 behaviour is= =20 >>that C now drops traffic towards this destination. However, C does=20 >>not remove the FIB entry for the Node-SID for E, it=B9s actually just=20 >>now known via Q. At this point, A can forward with exactly the same=20 >>stack, and the packet takes a new >>A-B- >> C-Q-E path, which is non-conformant with the performance requirement=20 >>of the service. >> >> >> >> In terms of what C does with its FIB, does it simply not use C-Q-E >>during >> the failure, but post-reconvergence use it anyway? If so, why not use=20 >>C-Q-E during the failure - because the service is always going to=20 >>non-conformant to the performance requirement? >> >> >> >> With an Adj-SID, it makes sense, because essentially unless that >> adjacency is available, then there is no alternate path for the SID=20 >>that will be taken - so traffic never hits a non-conformant path. >> >> >> >> Practically, if I can=B9t tell a customer that the path taken will >>definitely be >> A-B-C-D-E, and it may rather go via C-Q-E at some point following=20=20 >>convergence [until the head-end calculates that such a change had=20=20 >>happened - either a link outage, or a metric change - and stops using=20 >>the label stack], then there=B9s little problem of having the traffic=20 >>go via C-Q-E during protection. >> >> >> >> For the disjoint case, the consideration that one has to make is: >> >> * are alternative SPF paths for a particular Node-SID actually=20 >> >> still >> conformant with the disjointness requirement? How many simultaneous=20= =20 >>failures does one require to violate constraints. For example, in a >>dual- >> plane core network, then if the requirement is disjointness at the IP=20 >>level, then we may need to lose connectivity entirely within the=20 >>plane before it is preferable to =B3hop=B2 to another plane. In this=20 >>case, using an alternative SPF path for the Node-SID is actually not=20 >>a problem for disjointness. >> >> * does the application prefer losing an entire path to having=20 >> >> some >> risk of the services being shared fate until the re-optimisation? >> >> >> >> From the work that we=B9ve looked at thus far, I have not yet seen a >>case >> where I absolutely MUST NOT use an alternate shortest path for a=20 >>Node-SID and hence don=B9t require protection at a practical level. >> >> >> >> Stack depth is definitely going to be something that we need to >>consider >> - to me, where we have centralised controller - actions such as=20 >>dynamically created forwarding-adjacency LSPs which allow =B3expansion= =B2=20 >>of one segment into a set of segments within the path are attractive=20 >>as a solution where one needs to have explicit routing of traffic for=20 >>TE purposes. >> >> >> >> Does this make sense, or do you see the use case that we=B9re >>addressing >> here differently? >> >> >> >> Cheers, >> >> r. >> >> >> >> >> >>> On 7 Jan 2015, at 09:44, stephane.litkowski@orange.com wrote: >> >>> >> >>> Hi, >> >>> >> >>> I'm coming into this long thread and I tried to read all the=20 >> >>> exchange but I may be missed some lines :) >> >>> >> >>> But here is my opinion on this subject. >> >>> I think the point from Shradda is valuable in case of Traffic >>Engineering >> with Segment Routing, especially with a central controller. >> >>> >> >>> Today in TE networks, we are selling some disjoints paths to >>customer >> that MUST NOT be protected (SDH like services). It would be good to=20= =20 >>reproduce the same thing with SR-TE. >> >>> >> >>> Now, current encoding permits to advertise that a specific=20 >> >>> Adj-SID >>is >> protected or not (as already mentioned, this does not say that a=20 >>protection really exists ..., in case of LFA protection , there may=20 >>be no FRR path for this adj-SID despite of the protection flag set). >> >>> We pretty know that it would not be possible in all case to use >>only Adj- >> SID for a TE tunnel (due to label stack depth), so we need to=20 >>introduce stack compression using SPT segments and node-SID. >> >>> So to reply on Rob's comment, on RSVP-TE tunnels with looses hops >>that >> does not request protection : yes for RSVP, it does not make sense to=20 >>me, but for SR, due to stack compression, it will be needed. >> >>> >> >>> If we look at a network, where TE is managed by a central >>controller, >> how the controller can ensure that the node-SID used is protected or=20 >>not (as for Adj-SID, I mean protection requested, not protection=20 >>installed). I see two ways : >> >>> * Use two SIDs attached to the same prefix and add a flag to >>prevent >> automatically all nodes to compute a protection for one of the SID.=20 >>The flag does not really force nodes to compute a protection. Each=20 >>node will still require local configuration for protection, but the=20 >>flag will permit to exclude some prefixes for protection (overriding=20 >>local policy). >> >>> >> >>> * Use two prefixes on each node , prefixes are marked with tags >> (admin-tags) : "protection tag" and "non protection tag". Each router=20 >>is configured using LFA policies to not compute protection for=20 >>prefixes having "non protection tag" AND add knowledge to the=20 >>controller to use only "non protection tag" prefixes to compress non=20 >>protected path. >> >>> >> >>> >> >>> Best Regards, >> >>> >> >>> Stephane >> >>> >> >> >> >> >> ___________________________________________________________________ >> __ >> >> ____________________________________________________ >> >> >> >> Ce message et ses pieces jointes peuvent contenir des informations=20 >> >> confidentielles ou privilegiees et ne doivent donc pas etre=20 >> >> diffuses, exploites ou copies sans autorisation. Si vous avez recu=20 >> >> ce message par erreur, veuillez le signaler a l'expediteur et le=20 >> >> detruire ainsi >>que les >> pieces jointes. Les messages electroniques etant susceptibles=20 >>d'alteration, Orange decline toute responsabilite si ce message a ete=20 >>altere, deforme ou falsifie. Merci. >> >> >> >> This message and its attachments may contain confidential or=20 >> >> privileged information that may be protected by law; they should=20 >> >> 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=20 >> >> 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 >>=20 >> _______________________________________________ >> 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 ___________________________________________________________________________= ______________________________________________ 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 Wed Jan 14 03:54:30 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C0D9B1B2C6D for ; Wed, 14 Jan 2015 03:54:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham 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 eXaJlcPG1nFu for ; Wed, 14 Jan 2015 03:54:26 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias92.francetelecom.com [193.251.215.92]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A66011B2C70 for ; Wed, 14 Jan 2015 03:54:25 -0800 (PST) Received: from omfedm07.si.francetelecom.fr (unknown [xx.xx.xx.3]) by omfedm10.si.francetelecom.fr (ESMTP service) with ESMTP id EDD98264310; Wed, 14 Jan 2015 12:54:23 +0100 (CET) Received: from Exchangemail-eme2.itn.ftgroup (unknown [10.114.31.30]) by omfedm07.si.francetelecom.fr (ESMTP service) with ESMTP id C9FED4C114; Wed, 14 Jan 2015 12:54:23 +0100 (CET) Received: from OPEXCLILM34.corporate.adroot.infra.ftgroup ([169.254.4.232]) by OPEXCLILH02.corporate.adroot.infra.ftgroup ([10.114.31.30]) with mapi id 14.03.0224.002; Wed, 14 Jan 2015 12:54:23 +0100 From: To: Gregory Mirsky , "spring@ietf.org" Thread-Topic: Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoABH15AwACREr9A= Date: Wed, 14 Jan 2015 11:54:23 +0000 Message-ID: <3046_1421236463_54B658EF_3046_16262_1_9E32478DFA9976438E7A22F69B08FF920C76F7A6@OPEXCLILM34.corporate.adroot.infra.ftgroup> References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <7347100B5761DC41A166AC17F22DF1121B8D1189@eusaamb103.ericsson.se> In-Reply-To: <7347100B5761DC41A166AC17F22DF1121B8D1189@eusaamb103.ericsson.se> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.190922 Archived-At: Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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IHJlY2VpdmVkIHRoaXMgZW1haWwgaW4gZXJyb3IsIHBsZWFzZSBub3RpZnkgdGhlIHNlbmRlciBh bmQgZGVsZXRlIHRoaXMgbWVzc2FnZSBhbmQgaXRzIGF0dGFjaG1lbnRzLgpBcyBlbWFpbHMgbWF5 IGJlIGFsdGVyZWQsIE9yYW5nZSBpcyBub3QgbGlhYmxlIGZvciBtZXNzYWdlcyB0aGF0IGhhdmUg YmVlbiBtb2RpZmllZCwgY2hhbmdlZCBvciBmYWxzaWZpZWQuClRoYW5rIHlvdS4KCg== From nobody Wed Jan 14 05:42:22 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CD5FC1A8ACE for ; Wed, 14 Jan 2015 05:42:13 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -114.511 X-Spam-Level: X-Spam-Status: No, score=-114.511 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, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost 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AdAuQFBwOMX4RKSDQDm4YReqkwwvoABJ3x8AAAFTvwAACu+C4AAJRbqAABA3vlA= Date: Wed, 14 Jan 2015 13:42:05 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [161.44.212.95] Content-Type: text/plain; charset="windows-1257" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 14 Jan 2015 13:42:14 -0000 Hi Nagendra, Thanks for the comments. Please see in-line. > -----Original Message----- > From: Nagendra Kumar Nainar (naikumar) > Sent: Tuesday, January 13, 2015 11:50 PM > To: Nobo Akiya (nobo); Rob Shakir; stephane.litkowski@orange.com > Cc: spring@ietf.org > Subject: Re: [spring] Providing unprotected SPRING TE path >=20 > Hi Nobo, >=20 > Do you mean, set the TTL of SBFD session from A to C as 2? (depending on > the hops). I am not sure if that will help. Correct. TTL=3D2 and your_disc target is C. So the packet terminating on an= y nodes other than C will prevent reflector from generating the response. > Assume (in your topology) the > metric between B and C is 10 and A want to avoid link BC. So the normal > path from A to D is A-B-E-F-D and using Node SID D is sufficient to take = the > path that satisfy the constraint. In this case, I think relying on TTL ma= y not > help as on B if link BE fails, it redirects over lesser TTL path. If the normal path is A-B-E-F-D, then A will setup the S-BFD to terminate o= n E (w/ TTL=3D2). When the link BE fails, the packet will terminate on C (i= nstead of E) which will prevent A from getting further S-BFD reply (i.e., y= our_disc target is E). So this will allow A to know when it is taking undes= irable (whether that is triggered by protection or otherwise). Thanks! -Nobo >=20 > -Nagendra >=20 > On 1/13/15, 10:12 PM, "Nobo Akiya (nobo)" wrote: >=20 > >Hello Stephane, Rob, et al, > > > >Thanks for initiating this very interesting discussion. > > > >Please see in-line for one comment and one possible alternative. > > > >> -----Original Message----- > >> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Rob Shakir > >> Sent: Tuesday, January 13, 2015 9:11 AM > >> To: stephane.litkowski@orange.com > >> Cc: spring@ietf.org > >> Subject: Re: [spring] Providing unprotected SPRING TE path > >> > >> Apologies, someone pointed out an error in my email =8B thanks! > >> > >> > On 13 Jan 2015, at 13:33, Rob Shakir wrote: > >> > > >> > Hi Stephane, > >> > > >> > Thanks for kicking off this discussion =8B it=B9s one that we have h= ad > >> > a > >>few > >> conversations around. > >> > > >> >> On 12 Jan 2015, at 08:18, stephane.litkowski@orange.com wrote: > >> >> > >> >> [=D0 snip =D0] > >> >> > >> >> Now, as I explained, IMO, it's possible to introduce end to end > >> >> OAM > >>on > >> top on the SRTE to bring the LSP down as soon as there s something > >>wrong on the path. A Holddown timer can be used to keep LSP down > >>until convergence happens at Ingress or Controller. But introducing > >>such OAM and holddown and coupled with relations with IGP may also be > >>complex and there is a chance that it does not solve the issue. In > >>case of protected NodeSID used, OAM will not work, because switchover > >>time will be too small. Using OAM , defacto requires path with no > protection. > >> >> So unprotected SID+OAM may solve the use at the price of some > >> complexity and possibly not solving 100% of the cases. > >> > > >> > I agree here > >> > >> Apologies, I disagree that SID+OAM is a reasonable solution here. > > > >[NOBO] I agree that end to end OAM (i.e., continuity check) will be > >difficult, as there will be a race condition between local > >protection(s) and the end to end OAM declaring the failure. > > > >> > >> r. > >> > >> > - either the switchover time is very small, and hence we cannot > >> > detect > >> anything with connectivity verification OAM, and doing anything that > >> measures the performance does not guarantee that we have strict > >> affinity to the original path (the post-convergence and protection > >> paths may be within the same performance constraints). So, > >> no-protection and OAM is not a good way to ensure that we have strict > affinity. > >> > > >> >> > >> >> To conclude : > >> >> We need to solve this use case and we need to find another > >> >> elegant, > >> simple and scalable solution for this. > >> >> > >> >> Possible existing solutions : > >> >> - Use Adj-SID only =3D> does not sounds good as there will be an > >> >> impact of stack depth =3D> Path compression necessary > >> > > >> > Stack compression is only really required today because we have > >> hardware that has never needed the stack depths that we=B9re talking > >>about currently. Going forward, if SPRING-TE/SR-TE/AdjSID stacks are > >>popular as a solution, then I see no reason that we MUST always have > >>path compression. > >> It is simply that this isn=B9t a dimension that we=B9ve asked our > >>hardware colleagues to optimise for currently IMHO. I=B9m interested i= f > >>you=B9ve a different view? > >> > > >> >> - Use binding TLV and create some new Node-SID corresponding to a > >> >> set of Adj-SID =3D> This introduces more states within the network > >> >> (how many ?) > >> > > >> > How many is a question that depends on the network, and the > >>constraints > >> that one places - since this tells you what the AdjSID stack size can > >>be. In some cases, it can be worse than the network diameter, because > >>the constraints may require it. To this end, we can do some analysis > >>to see whether we can determine the number of Binding-TLVs that are > >>going to be required, and then subsequently, figure out how such > >>SID-expansion bindings are created (by PCE, manually by operator?)... > >> > > >> >> - Anything else ? > >> > > >> > Nothing else comes to mind from me at the moment. Would be > >> > interested > >> to hear whether there are other views within the WG. > > > >[NOBO] If I assume one condition, then there is another possibility. > > > >The assumption is that if there is a parallel link between a pair of > >nodes, then the SRTE will be: > >- using an Adj-SID on that hop, or > >- using a Node-SID to traverse that hop but don't care which link is > >traversed > > > >If above assumption is reasonable, then the requirements to OAM seem to > >be that: > >(1) N-th hop of a Node-SID forwarding MUST traverses a certain node. > >(2) An SRTE MAY have multiple instances of (1). > > > >For example: > > > >A----B----C----D > > | | > > E----F > > > >Node A has SRTE that consists of Node-SID D but need to ensure that > >A-B-C-D is traversed. > > > >Node A can create an end to end OAM to monitor the reachability to D. > > > >Additionally, Node A can create an S-BFD session to Node C with > >specific TTL. "your discriminator" of such S-BFD packet guarantees that > >Node A only gets the response as long as the packet is terminating on > Node C. > >When Node B triggers a local protection or [re]convergence causes the > >packet to traverse A-B-E-F-C-D, then Node A can deterministically > >detect this and can take a necessary action (e.g., fall back to the > >backup LSP or re-compute a new path). > > > >Something like that is a possibility with S-BFD. > > > >Thanks! > > > >-Nobo > > > >> > > >> > r. > >> > > >> >> > >> >> Best regards, > >> >> > >> >> Stephane > >> >> > >> >> > >> >> -----Original Message----- > >> >> From: Rob Shakir [mailto:rjs@rob.sh] > >> >> Sent: Thursday, January 08, 2015 10:52 > >> >> To: LITKOWSKI Stephane SCE/IBNF > >> >> Cc: Les Ginsberg (ginsberg); Shraddha Hegde; Pushpasis Sarkar; > >> >> Peter Psenak (ppsenak); > >> >> draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; > >> >> draft-ietf-isis-segment-routing-extensions@tools.ietf.org; Hannes > >> >> Gredler; ospf@ietf.org; isis-wg@ietf.org > >> >> Subject: Re: [Isis-wg] [OSPF] Mail regarding > >> >> draft-ietf-ospf-segment-routing-extensions > >> >> > >> >> Stephane, > >> >> > >> >> If we think about the =B3MUST NOT be protected=B2 case that you men= tion. > >> Let=B9s assume that we have a service that is performance sensitive, > >>such that we want to take a particular path through the network - and > >>that we use Node-SIDs like you say. > >> >> > >> >> If we assume that the requirement is for A-B-C-D-E path below. The > >>node > >> SID for E points via C-D-E and hence is used for stack compression > >>like you > >> say: > >> >> > >> >> A -- B -- C -- D -- E > >> >> | / > >> >> --- Q --- > >> >> > >> >> In your envisaged behaviour, C does not protect the Node-SID for E. > >>In > >> the case of the C-D link failure, then the =B3preferred=B2 behaviour i= s > >>that C now drops traffic towards this destination. However, C does > >>not remove the FIB entry for the Node-SID for E, it=B9s actually just > >>now known via Q. At this point, A can forward with exactly the same > >>stack, and the packet takes a new > >>A-B- > >> C-Q-E path, which is non-conformant with the performance requirement > >>of the service. > >> >> > >> >> In terms of what C does with its FIB, does it simply not use C-Q-E > >>during > >> the failure, but post-reconvergence use it anyway? If so, why not use > >>C-Q-E during the failure - because the service is always going to > >>non-conformant to the performance requirement? > >> >> > >> >> With an Adj-SID, it makes sense, because essentially unless that > >> adjacency is available, then there is no alternate path for the SID > >>that will be taken - so traffic never hits a non-conformant path. > >> >> > >> >> Practically, if I can=B9t tell a customer that the path taken will > >>definitely be > >> A-B-C-D-E, and it may rather go via C-Q-E at some point following > >>convergence [until the head-end calculates that such a change had > >>happened - either a link outage, or a metric change - and stops using > >>the label stack], then there=B9s little problem of having the traffic > >>go via C-Q-E during protection. > >> >> > >> >> For the disjoint case, the consideration that one has to make is: > >> >> * are alternative SPF paths for a particular Node-SID actually > >> >> still > >> conformant with the disjointness requirement? How many simultaneous > >>failures does one require to violate constraints. For example, in a > >>dual- > >> plane core network, then if the requirement is disjointness at the IP > >>level, then we may need to lose connectivity entirely within the > >>plane before it is preferable to =B3hop=B2 to another plane. In this > >>case, using an alternative SPF path for the Node-SID is actually not > >>a problem for disjointness. > >> >> * does the application prefer losing an entire path to having > >> >> some > >> risk of the services being shared fate until the re-optimisation? > >> >> > >> >> From the work that we=B9ve looked at thus far, I have not yet seen = a > >>case > >> where I absolutely MUST NOT use an alternate shortest path for a > >>Node-SID and hence don=B9t require protection at a practical level. > >> >> > >> >> Stack depth is definitely going to be something that we need to > >>consider > >> - to me, where we have centralised controller - actions such as > >>dynamically created forwarding-adjacency LSPs which allow =B3expansion= =B2 > >>of one segment into a set of segments within the path are attractive > >>as a solution where one needs to have explicit routing of traffic for > >>TE purposes. > >> >> > >> >> Does this make sense, or do you see the use case that we=B9re > >>addressing > >> here differently? > >> >> > >> >> Cheers, > >> >> r. > >> >> > >> >> > >> >>> On 7 Jan 2015, at 09:44, stephane.litkowski@orange.com wrote: > >> >>> > >> >>> Hi, > >> >>> > >> >>> I'm coming into this long thread and I tried to read all the > >> >>> exchange but I may be missed some lines :) > >> >>> > >> >>> But here is my opinion on this subject. > >> >>> I think the point from Shradda is valuable in case of Traffic > >>Engineering > >> with Segment Routing, especially with a central controller. > >> >>> > >> >>> Today in TE networks, we are selling some disjoints paths to > >>customer > >> that MUST NOT be protected (SDH like services). It would be good to > >>reproduce the same thing with SR-TE. > >> >>> > >> >>> Now, current encoding permits to advertise that a specific > >> >>> Adj-SID > >>is > >> protected or not (as already mentioned, this does not say that a > >>protection really exists ..., in case of LFA protection , there may > >>be no FRR path for this adj-SID despite of the protection flag set). > >> >>> We pretty know that it would not be possible in all case to use > >>only Adj- > >> SID for a TE tunnel (due to label stack depth), so we need to > >>introduce stack compression using SPT segments and node-SID. > >> >>> So to reply on Rob's comment, on RSVP-TE tunnels with looses hops > >>that > >> does not request protection : yes for RSVP, it does not make sense to > >>me, but for SR, due to stack compression, it will be needed. > >> >>> > >> >>> If we look at a network, where TE is managed by a central > >>controller, > >> how the controller can ensure that the node-SID used is protected or > >>not (as for Adj-SID, I mean protection requested, not protection > >>installed). I see two ways : > >> >>> * Use two SIDs attached to the same prefix and add a flag to > >>prevent > >> automatically all nodes to compute a protection for one of the SID. > >>The flag does not really force nodes to compute a protection. Each > >>node will still require local configuration for protection, but the > >>flag will permit to exclude some prefixes for protection (overriding > >>local policy). > >> >>> > >> >>> * Use two prefixes on each node , prefixes are marked with tags > >> (admin-tags) : "protection tag" and "non protection tag". Each router > >>is configured using LFA policies to not compute protection for > >>prefixes having "non protection tag" AND add knowledge to the > >>controller to use only "non protection tag" prefixes to compress non > >>protected path. > >> >>> > >> >>> > >> >>> Best Regards, > >> >>> > >> >>> Stephane > >> >>> > >> >> > >> >> > >> > ___________________________________________________________________ > >> __ > >> >> ____________________________________________________ > >> >> > >> >> 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 > >> > >> _______________________________________________ > >> 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 Wed Jan 14 05:48:28 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 816191B2C9B for ; Wed, 14 Jan 2015 05:48:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -114.511 X-Spam-Level: X-Spam-Status: No, score=-114.511 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, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=ham 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 VNUeao90pJgd for ; Wed, 14 Jan 2015 05:48:21 -0800 (PST) Received: from alln-iport-4.cisco.com (alln-iport-4.cisco.com [173.37.142.91]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A5EB81A8ACE for ; Wed, 14 Jan 2015 05:48:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=22904; q=dns/txt; s=iport; t=1421243301; x=1422452901; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=wItBrNn69WXOQXXqIZczMB+2OMhZp+hm+POiEWM0NL8=; b=bIfXVc7Lr/e8MyxG7M+7SoEFql6ZQ8yYL68jzQjvtIL4MtWWQIk5aOhu DTaIjUdeL9EgRMOwVEVsY1ogUJgWW9QCHX/yQ3nor9YCfmOf+RCDfMqhM XYB0lZvqk1IXM5q+J3GQ0l6T59eIfkRGX+aO2IHWEOoPO1yokwC9k3rbO 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AlcIACdztlStJA2N/2dsb2JhbABbgmQiUlgEgwHCdwqFJ0oCHHtDAQEBAQF9hAwBAQEDAQEBASAROgQHDAQCAQgRBAEBAQICBh0DAgICJQsUAQgIAQEEAQ0FCBOICQgBDLw5lCMBAQEBAQEBAQEBAQEBAQEBAQEBAQETBIEhiG6EfwkQAgEeFhsHBoJiLoETBYxngVuKHIJygjqIBIM9IoNub4FFfgEBAQ X-IronPort-AV: E=Sophos;i="5.07,756,1413244800"; d="scan'208";a="113185789" Received: from alln-core-8.cisco.com ([173.36.13.141]) by alln-iport-4.cisco.com with ESMTP; 14 Jan 2015 13:48:20 +0000 Received: from xhc-aln-x11.cisco.com (xhc-aln-x11.cisco.com [173.36.12.85]) by alln-core-8.cisco.com (8.14.5/8.14.5) with ESMTP id t0EDmKSu003238 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 14 Jan 2015 13:48:20 GMT Received: from xmb-aln-x01.cisco.com ([fe80::747b:83e1:9755:d453]) by xhc-aln-x11.cisco.com ([173.36.12.85]) with mapi id 14.03.0195.001; Wed, 14 Jan 2015 07:48:19 -0600 From: "Nobo Akiya (nobo)" To: Mach Chen , Rob Shakir , "stephane.litkowski@orange.com" Thread-Topic: [spring] Providing unprotected SPRING TE path Thread-Index: AdAuQFBwOMX4RKSDQDm4YReqkwwvoABJ3x8AAAFTvwAACu+C4AAWe/6AAANSd7A= Date: Wed, 14 Jan 2015 13:48:19 +0000 Message-ID: References: <20260_1421050701_54B3834D_20260_16413_1_9E32478DFA9976438E7A22F69B08FF920C76D282@OPEXCLILM34.corporate.adroot.infra.ftgroup> <98DFDE45-A005-4556-AE7A-CDB35C76D3A8@rob.sh> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [161.44.212.95] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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boundary="_000_CECE764681BE964CBE1DFF78F3CDD39446D6B23Axmbalnx01ciscoc_" MIME-Version: 1.0 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] Providing unprotected SPRING TE path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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2015 21:12:19 +0800 From: Lizhenbin To: "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZw== Date: Thu, 15 Jan 2015 13:12:18 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430nkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 15 Jan 2015 13:12:32 -0000 --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430nkgeml506mbxchi_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 SGkgYWxsIGF1dGhvcnMgb2Ygc2VnbWVudCByb3V0aW5nLA0KDQoNCg0KV2hlbiB3ZSBkaWQgcmVz ZWFyY2ggb24gc2VnbWVudCByb3V0aW5nIGFuZCBmb3VuZCBzb21lIG5ldyBpc3N1ZXMuIENvdWxk IHlvdSBoZWxwIGNsYXJpZnkgaWYgdGhlIGFuYWx5c2lzIGlzIHJpZ2h0IGFuZA0KDQpob3cgd2ls bCB0aGV5IGJlIHRha2VuIGludG8gYWNjb3VudCBpbiB0aGUgZGVzaWduIG9mIFNSLg0KDQoNCg0K VGhpcyBpcyB0aGUgZmlyc3QgaXNzdWUuDQoNCiAgICAgICAgICAgICAgICAgICAgICAgICAgIChO b24tU1IpDQogIFMxMS0tLS0tLS0tLS0tUzEyLS0tLS0tLS0tLVMxMy0tLS0tLS0tLVMxNA0KICAg fCAgICAgICAgICAgICB8ICAgICAgICAgICAgfCAgICAgICAgICAgfA0KICAgfCAgICAgICAgICAg ICB8ICAgICAgICAgICAgfCAgICAgICAgICAgfA0KICAgfCAgICAgICAgICAgICB8ICAgICAgICAg ICAgfCAgICAgICAgICAgfA0KICBTMjEtLS0tLS0tLS0tLVMyMi0tLS0tLS0tLS1TMjMtLS0tLS0t LS1TMjQNCg0KQXMgYWJvdmUgdG9wb2xvYnksIHRoZXJlIGFyZSA4IG5vZGVzIGFuZCBhc3N1bWUg YWxsIHRoZSBtZXRpY3Mgb2YgdGhlIGxpbmtzIGFyZSAxIGFuZCBWUE5zIGFyZSBkZXBsb3llZA0K b24gUzExL1MyMS9TMTQvUzI0Lg0KDQpJZiBMRFAgaXMgdXNlZCBhcyB0aGUgdHVubmVsIGZvciBW UE4gb24gUzExL1MxNCwgc2luY2UgTERQIGNhbiBzdXBwb3J0IHRoZSBvcmRlcmVkIG1vZGUuIFRo ZSBMU1AgZm9yIHRoZSBTMTQgd2lsbCBiZQ0Kc2V0dXAgYXMgdGhlIG9yZGVyIFMxNC0+UzEzLT5T MTItPlMxMSBmb3IgZGlzdHJpYnV0aW9uIG9mIGxhYmVsIG1hcHBpbmcuIEFuZCB0aGUgc2hvcnRl c3QgcGF0aCBmb3Igcm91dGVzDQp0byBTMTQgaXMgYWxzbyBTMTEtPlMxMi0+UzEzLT5TMTQuIFNv IHRoZSBlbmQtdG8tZW5kIExTUCB0byBTMTQgaXMgc2V0dXAuIElmIG9uZSBub2RlIChlLmcuIFMx MykgZG9lcyBub3QNCnN1cHBvcnQgTERQLCBhY2NvcmRpbmcgdG8gTERQIG9yZGVyZWQgbW9kZSwg dGhlIGVuZC10by1lbmQgTFNQIGNhbm5vdCBzZXR1cCBzaW5jZSBTMTIgZG9lcyBub3QgcmVjZWl2 ZSB0aGUgbGFiZWwNCm1hcHBpbmcgZnJvbSB0aGUgZXhhY3QgbmV4dGhvcCBvZiB0aGUgcm91dGUs IFMxMyBhbmQgaXQgd2lsbCBub3QgZGlzdHJpYnV0ZSB0aGUgbGFiZWwgbWFwcGluZyB0byBTMTEu IEFuZCB0aGUNCg0KcmVzdWx0IGlzIHRoYXQgdGhlIFZQTiBvbiBTMTEgY2Fubm90IHRha2UgdGhl IExTUCBzaW5jZSB0aGUgTFNQIGNhbm5vdCBzZXR1cCBvbiBTMTEuDQoNCklmIFNSLUJFIHBhdGgg aXMgdXNlZCBhcyB0aGUgdHVubmVsIGZvciBWUE4gb24gUzExL1MxNCBhbmQgYXNzdW1lIHRoZSBT MTMgY2Fubm90IHN1cHBvcnQgdGhlIFNSLCBhY2NvcmRpbmcgdG8gbXkNCnVuZGVyc3RhbmRpbmcs IHRoZXJlIHdpbGwgYmUgYW4gU1ItQkUgcGF0aCBmb3IgdGhlIGRlc3RpbmF0aW9uIFMxNCB3aGlj aCBpcyBpbnRlcnJ1cHRlZCBhdCBTMTIuIFRoaXMgaXMgc2ltaWxhciBhcw0KdGhlIGluZGVwZW5k ZW50IG1vZGUgb2YgTERQLiBJZiB0aGlzIFZQTiB0YWtlcyB0aGlzIFNSLUJFIFBhdGggYXQgUzEx LCB0aGUgVlBOIHRyYWZmaWMgd2lsbCBiZSBkcm9wcGVkIGF0IFMxMi4NCg0KSWYgdGhlIGFuYWx5 c2lzIGlzIHJpZ2h0LiBJIGhhdmUgdHdvIHF1ZXN0aW9uczoNCjEuIEhvdyB3aWxsIFNSIGF2b2lk IHN1Y2ggcmlzaz8gU29tZSBlbmhhbmNlbWVudCBvbiBTUiBvciBqdXN0IGxlYXZlIGl0IHRvIHRo ZSBsb2NhbCBpbXBsbWVudGF0aW9uIChGb3IgZXhhbXBsZSwNCkxTUCBwaW5nIGlzIGZpcnN0bHkg dXNlZCB0byBjaGVjayB0aGUgY29ubmVjdGl2aXR5KT8NCjIuIEFzc3VtZSBMRFAgaXMgYWxyZWFk eSBkZXBsb3llZCBvbiBhbGwgbm9kZXMgaW4gdGhlIG5ldHdvcmsgdG8gYmVhciBWUE4gdHJhZmZp Yy4gV2hlbiBTUi1CRSBwYXRoIGlzIGFkb3B0ZWQgaW4gdGhlDQpuZXR3b3JrIHRvIHJlcGxhY2Ug TERQIExTUCwgc2luY2UgdGhlcmUgaXMgdGhlIHBvc3NpYmxlIHJpc2sgcHJvcG9zZWQgYnkgaW50 ZXJydXB0ZWQgU1ItQkUgcGF0aCBhbmQgSSBkbyBub3QgdGhpbmsgaXQNCg0KaXMgaW1wb3NzaWJs ZSB0byBjYXJlZnVsbHkgZGV0ZXJtaW5lIHRoZSB1cGdyYWRlZCBub2Rlcy4gU28gdGhlIG9ubHkg Y2hvaWNlIGlzIHRvIHVwZ3JhZGUgYWxsIG5vZGVzIHRvIHN1cHBvcnQgU1IgYWxsDQoNCmF0IG9u Y2UuIGlzIHRoYXQgcmlnaHQgdGhhdCB0aGUgaW5jcmVtZW50YWwgZGVwbG95bWVudCBvZiBTUiBp biBzdWNoIHNjZW5hcmlvIGlzIGRpZmZpY3VsdCB0byBhZG9wdD8NCg0KDQoNCg0KDQpSZWdhcmRz LA0KDQpaaGVuYmluKFJvYmluKQ0K --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430nkgeml506mbxchi_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi all authors of segment routing,

 

When we did research on segment routing and found= some new issues. Could you help clarify if the analysis is right and

how will they be taken into account in the design= of SR.

 

This is the first issue.

        &= nbsp;           &nbs= p;      (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

result is that the VPN on S11 cannot take the LSP since the LSP can= not setup on S11. 

If SR-BE path is used as the tunnel for VPN on S11/S14 and assume the S1= 3 cannot support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If the analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?
2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. When SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is impossible to carefully determine the upgraded nodes. So the only cho= ice is to upgrade all nodes to support SR all

at once. is that right that the incremental deployment of SR in such sce= nario is difficult to adopt?

 

 

Regards,

Zhenbin(Robin)

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430nkgeml506mbxchi_-- From nobody Thu Jan 15 07:57:30 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83CE71B2CBE for ; Thu, 15 Jan 2015 07:57:13 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham 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 0oAUG_SEgSOW for ; Thu, 15 Jan 2015 07:57:08 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias91.francetelecom.com [193.251.215.91]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C6A731B2CB9 for ; Thu, 15 Jan 2015 07:57:02 -0800 (PST) Received: from omfedm05.si.francetelecom.fr (unknown [xx.xx.xx.1]) by omfedm09.si.francetelecom.fr (ESMTP service) with ESMTP id 126EB2DC50A; Thu, 15 Jan 2015 16:57:01 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.183]) by omfedm05.si.francetelecom.fr (ESMTP service) with ESMTP id E506A35C0D3; Thu, 15 Jan 2015 16:57:00 +0100 (CET) Received: from PEXCVZYM11.corporate.adroot.infra.ftgroup ([fe80::a441:e6a9:6143:6f0f]) by PEXCVZYH02.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0224.002; Thu, 15 Jan 2015 16:57:00 +0100 From: To: Lizhenbin , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMg Date: Thu, 15 Jan 2015 15:56:59 +0000 Message-ID: <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com> In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.197.38.6] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A0EB05CE7PEXCVZYM11corpo_" MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.190922 Archived-At: Subject: Re: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 15 Jan 2015 15:57:13 -0000 --_000_53C29892C857584299CBF5D05346208A0EB05CE7PEXCVZYM11corpo_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Robin, Thanks for your interest on SR/SPRING. Please see inline. [Bruno] From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Lizhenbin Sent: Thursday, January 15, 2015 2:12 PM To: spring@ietf.org Subject: [spring] New Comments on Segment Routing(1): Challenge of Ordered = mode for SR-BE Path and Incremental Deployment Hi all authors of segment routing, When we did research on segment routing and found some new issues. Could yo= u help clarify if the analysis is right and how will they be taken into account in the design of SR. This is the first issue. (Non-SR) S11-----------S12----------S13---------S14 | | | | | | | | | | | | S21-----------S22----------S23---------S24 As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed on S11/S21/S14/S24. If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be setup as the order S14->S13->S12->S11 for distribution of label mapping. An= d the shortest path for routes to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is setup. I= f one node (e.g. S13) does not support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the result is that the VPN on S11 cannot take the LSP since the LSP cannot setu= p on S11. [Bruno] My understanding of your case is the following, please correct me if I'm wr= ong: There is no SPRING/SR. All nodes support LDP. S11, S12, S14 use ordered mod= e. S13 use independent mode. First, such cases happen today in multiple vendor networks since different = implementation used different options. Then, I believe that your understanding of LDP independant mode is incorre= ct. In independent mode, S13 always advertises the S14 FEC to its neighbor,= even if it don't gets a label mapping from its downstream S14. This FEC is= then propagated to S11 in ordered mode. As a result, S11 gets a label for S14 and will use S14 for the VPN. However= in the forwarding plane the traffic will be dropped on S13. If SR-BE path is used as the tunnel for VPN on S11/S14 and assume the S13 c= annot support the SR, according to my understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12. If the analysis is right. I have two questions: 1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example, LSP ping is firstly used to check the connectivity)? [Bruno] A priori, I could see 3 answers -a- I guess one could use IGP multi-topology to handle a different topology= between the IP and the MPLS one. This is similar to IPv6 introduction in a= IPv4 network. -b- Another option is to enable interworking between LDP and SR/SPRING to h= andle such incremental deployment. Please see the following draft for an in= troduction on this interworking: https://tools.ietf.org/html/draft-filsfils= -spring-segment-routing-ldp-interop-02 Comments are welcomed as I agree wit= h you that's an important topic for brownfield incremental deployment -c- Another option is to incrementally deploy SR in addition to LDP and to = prefer LDP for end to end LSP (using administrative distance). Then it's up= to each SR application to see how much they can take benefit of partial SR= deployment. e.g. FRR (TI-LFA, RLFA or DLFA) may/should be able to benefit = from partial deployment. FYI, as of today/myself I say that "b" is required and "c" is nice to have. 2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. When SR-BE path is adopted in the network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it is impossible to carefully determine the upgraded nodes. [Bruno] I'm not sure to correctly understand your last sentence. Within an = AS (well area/level) It is possible to identify nodes which are SR/SPRING c= ompliant (or non compliant) as they advertise this in the link state IGP. So the only choice is to upgrade all nodes to support SR all at once. [Bruno] No. is that right that the incremental deployment of SR in such scenario is dif= ficult to adopt? Regards, Zhenbin(Robin) ___________________________________________________________________________= ______________________________________________ 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. --_000_53C29892C857584299CBF5D05346208A0EB05CE7PEXCVZYM11corpo_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Robin,

 <= /p>

Thanks for= your interest on SR/SPRING.

Please see inline. [Bruno= ]

 <= /p>

From: spring [= mailto:spring-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Thursday, January 15, 2015 2:12 PM
To: spring@ietf.org
Subject: [spring] New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

 

Hi all = authors of segment routing,

 

When we= did research on segment routing and found some new issues. Could you help = clarify if the analysis is right and

how wil= l they be taken into account in the design of SR.

 

This is= the first issue.

 &= nbsp;           &nbs= p;             = (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

result = is that the VPN on S11 cannot take the LSP since the LSP cannot setup = on S11. 

[Bruno]

My understanding of your case = is the following, please correct me if I’m wrong:

There is no SPRING/SR. All nod= es support LDP. S11, S12, S14 use ordered mode. S13 use independent mode.

 

First, such cases happen today= in multiple vendor networks since different implementation used different = options.

Then, I believe that your unde= rstanding of LDP independant mode  is incorrect. In independent mode, = S13 always advertises the S14 FEC to its neighbor, even if it don’t gets a label mapping from its downstream S14. This FEC is then= propagated to S11 in ordered mode.

As a result, S11 gets a label = for S14 and will use S14 for the VPN. However in the forwarding plane the t= raffic will be dropped on S13.

 

 

If SR-BE path is used as the tunnel for VPN on S11/S14 and assume t= he S13 can= not support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If the = analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?

[Bruno] A priori, I could see = 3 answers

-a- I guess one could use IGP = multi-topology to handle a different topology between the IP and the MPLS o= ne. This is similar to IPv6 introduction in a IPv4 network.

-b- Another option is to enabl= e interworking between LDP and SR/SPRING to handle such incremental deploym= ent. Please see the following draft for an introduction on this interworking: https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp-inter= op-02 Comments are welcomed as I agree with you that’s an importa= nt topic for brownfield incremental deployment

-c- Another option is to incre= mentally deploy SR in addition to LDP and to prefer LDP for end to end LSP = (using administrative distance). Then it’s up to each SR application to see how much they can take benefit of partial SR deployment= . e.g. FRR (TI-LFA, RLFA or DLFA) may/should be able to benefit from partia= l deployment.

 

FYI, as of today/myself I say = that “b” is required and “c” is nice to have.<= /o:p>


2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. Whe= n SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is impo= ssible to carefully determine the upgraded nodes. <= o:p>

[Bruno] I’m not sure to = correctly understand your last sentence. Within an AS (well area/level) It = is possible to identify nodes which are SR/SPRING compliant (or non compliant) as they advertise this in the link state IGP.

 

 

So the only choice is to upgrade all nodes to support SR all at onc= e.

[Bruno] No.<= /p>

 

is that right that the incremental deployment of SR in such scenari= o is difficult to adopt?

 

 

 

Regards,

Zhenbin(Robin)

______________________________________________________________________=
___________________________________________________

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.
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Thank you.
--_000_53C29892C857584299CBF5D05346208A0EB05CE7PEXCVZYM11corpo_-- From nobody Thu Jan 15 23:55:46 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2C42F1AC3AD for ; Thu, 15 Jan 2015 23:55:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham 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 PBtipypJT6Di for ; Thu, 15 Jan 2015 23:55:37 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias245.francetelecom.com [80.12.204.245]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3691C1AC3A0 for ; Thu, 15 Jan 2015 23:55:37 -0800 (PST) Received: from omfeda06.si.francetelecom.fr (unknown [xx.xx.xx.199]) by omfeda13.si.francetelecom.fr (ESMTP service) with ESMTP id 46E651902A5; Fri, 16 Jan 2015 08:55:35 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.186]) by omfeda06.si.francetelecom.fr (ESMTP service) with ESMTP id 1BDEDC80F8; Fri, 16 Jan 2015 08:55:35 +0100 (CET) Received: from PEXCVZYM11.corporate.adroot.infra.ftgroup ([fe80::a441:e6a9:6143:6f0f]) by PEXCVZYH01.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0224.002; Fri, 16 Jan 2015 08:55:34 +0100 From: To: DECRAENE Bruno IMT/OLN , Lizhenbin , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMgACIGuXA= Date: Fri, 16 Jan 2015 07:55:34 +0000 Message-ID: <14070_1421394935_54B8C3F7_14070_10706_1_efbf4bbc-187a-4570-aebd-774222e5c74e@PEXCVZYH01.corporate.adroot.infra.ftgroup> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com> <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup> In-Reply-To: <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.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: [10.197.38.6] Content-Type: multipart/alternative; boundary="_000_efbf4bbc187a4570aebd774222e5c74ePEXCVZYH01corporateadro_" MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.22.201820 Archived-At: Subject: Re: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 16 Jan 2015 07:55:44 -0000 --_000_efbf4bbc187a4570aebd774222e5c74ePEXCVZYH01corporateadro_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 1 correction inlined. [Bruno2] From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Thursday, January 15, 2015 4:57 PM [...] This is the first issue. (Non-SR) S11-----------S12----------S13---------S14 | | | | | | | | | | | | S21-----------S22----------S23---------S24 As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed on S11/S21/S14/S24. If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be setup as the order S14->S13->S12->S11 for distribution of label mapping. An= d the shortest path for routes to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is setup. I= f one node (e.g. S13) does not support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the result is that the VPN on S11 cannot take the LSP since the LSP cannot setu= p on S11. [Bruno] My understanding of your case is the following, please correct me if I'm wr= ong: There is no SPRING/SR. All nodes support LDP. S11, S12, S14 use ordered mod= e. S13 use independent mode. First, such cases happen today in multiple vendor networks since different = implementation used different options. Then, I believe that your understanding of LDP independant mode is incorre= ct. In independent mode, S13 always advertises the S14 FEC to its neighbor,= even if it don't gets a label mapping from its downstream S14. This FEC is= then propagated to S11 in ordered mode. As a result, S11 gets a label for S14 and will use S14 for the VPN. However= in the forwarding plane the traffic will be dropped on S13. [Bruno2] I withdraw my last sentence. In this fist cast, traffic is not dro= pped. It works fine. We only lose the propagation of LDP FEC status in the = control plane. ___________________________________________________________________________= ______________________________________________ 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. --_000_efbf4bbc187a4570aebd774222e5c74ePEXCVZYH01corporateadro_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

1 correcti= on inlined. [Bruno2]

 = ;

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene= @orange.com
Sent: Thursday, January 15, 2015 4:57 PM
[…]

 

This is= the first issue.

 &= nbsp;           &nbs= p;             = (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

result = is that the VPN on S11 cannot take the LSP since the LSP cannot setup = on S11. 

[Bruno]

My understanding of your case = is the following, please correct me if I’m wrong:

There is no SPRING/SR. All nod= es support LDP. S11, S12, S14 use ordered mode. S13 use independent mode.

 

First, such cases happen today= in multiple vendor networks since different implementation used different = options.

Then, I believe that your unde= rstanding of LDP independant mode  is incorrect. In independent mode, = S13 always advertises the S14 FEC to its neighbor, even if it don’t gets a label mapping from its downstream S14. This FEC is then= propagated to S11 in ordered mode.

As a result, S11 gets a label = for S14 and will use S14 for the VPN. However in the forwarding plane the t= raffic will be dropped on S13.

 

 

[Bruno2] I withdraw my last se= ntence. In this fist cast, traffic is not dropped. It works fine. We only l= ose the propagation of LDP FEC status in the control plane.

 

______________________________________________________________________=
___________________________________________________

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.
--_000_efbf4bbc187a4570aebd774222e5c74ePEXCVZYH01corporateadro_-- From nobody Fri Jan 16 07:10:00 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 06E7B1A924C for ; Fri, 16 Jan 2015 07:09:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham 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 crOLVA7-ChAu for ; Fri, 16 Jan 2015 07:09:55 -0800 (PST) Received: from usevmg20.ericsson.net (usevmg20.ericsson.net [198.24.6.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EB3EB1ACD1E for ; Fri, 16 Jan 2015 07:09:41 -0800 (PST) X-AuditID: c618062d-f79376d000000ceb-39-54b8d76a9326 Received: from EUSAAHC001.ericsson.se (Unknown_Domain [147.117.188.75]) by usevmg20.ericsson.net (Symantec Mail Security) with SMTP id 0E.39.03307.A67D8B45; Fri, 16 Jan 2015 10:18:34 +0100 (CET) Received: from EUSAAMB109.ericsson.se ([147.117.188.126]) by EUSAAHC001.ericsson.se ([147.117.188.75]) with mapi id 14.03.0195.001; Fri, 16 Jan 2015 10:09:39 -0500 From: Jeff Tantsura To: Lizhenbin , "spring@ietf.org" Thread-Topic: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AQHQMZ5yw9VxnP/KPUi4UzdSOTm1TA== Date: Fri, 16 Jan 2015 15:09:38 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.4.4.140807 x-originating-ip: [147.117.188.9] Content-Type: multipart/alternative; boundary="_000_D0DE665989C95jefftantsuraericssoncom_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrNLMWRmVeSWpSXmKPExsUyuXSPt27W9R0hBlMPaljsbvzDbnH8wm9G ByaPliNvWT2WLPnJFMAUxWWTkpqTWZZapG+XwJWxfOI21oKLgRWnm56yNDB2uXQxcnBICJhI /Nkf2sXICWSKSVy4t56ti5GLQ0jgCKPExgM/mEASQgLLGSX+nDUBsdkEDCT+fzvOAmKLCHhK XGxazw5iCwvUS8x+MZ0FpFlEoIFR4sSC51BFehL/nr9iA7FZBFQlPtxcwAKymFfAXOL+RU6Q MCPQ4u+n1oDtYhYQl7j1ZD4TxEECEkv2nGeGsEUlXj7+xwpiiwKNfLZhMztEXFFiX/90doje GIk3S6eA2bwCghInZz5hmcAoPAvJ2FlIymYhKYOIG0i8PzefGcLWlli28DWUrS+x8ctZRgjb WmLLq58syGoWMHKsYuQoLU4ty003MtjECIydYxJsujsY97y0PMQowMGoxMO7oW5HiBBrYllx Ze4hRmkOFiVx3pZ360OEBNITS1KzU1MLUovii0pzUosPMTJxcEo1MCoZruK5k2ajcLDisug5 Ls27Nu/u7eV+myPZ4nfltC9X6+2g+NYoJ44Xl74Zml6L+uzzOHvpY/6nh7fnvD0wQf6M2rUF b5Y/ZP5W0vLd1Jr1nu2M3Sx3D7ud5fsnzn8wtattica0UM/L0zo2+V2IsW4sdflcO93c+4zq zFnn5/qdipC8kV6S2KXEUpyRaKjFXFScCAA/q6EgfgIAAA== Archived-At: Subject: Re: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 16 Jan 2015 15:09:58 -0000 --_000_D0DE665989C95jefftantsuraericssoncom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Robin, Your understanding of interworking on Independent and Ordered control is in= correct. Please read RFC5036 sections 2.6.1.1. Independent Label Distribution Contr= ol and 2.6.1.2. Ordered Label Distribution Control. In the case described S13 (Independent) will distribute mapping for S14 wit= hout need to receive it from downstream node (that=92s why it is called Ind= ependent). S12(Ordered) will then send it to its upstream The general issue with Independent is described in section 2.6.1.1. Indepen= dent Label Distribution Control and is not SR related. =93A consequence of using independent mode is that an upstream label can be= advertised before a downstream label is received.=94 Hope this clarifies, Cheers, Jeff From: Lizhenbin > Date: Thursday, January 15, 2015 at 5:12 AM To: "spring@ietf.org" > Subject: [spring] New Comments on Segment Routing(1): Challenge of Ordered = mode for SR-BE Path and Incremental Deployment Hi all authors of segment routing, When we did research on segment routing and found some new issues. Could yo= u help clarify if the analysis is right and how will they be taken into account in the design of SR. This is the first issue. (Non-SR) S11-----------S12----------S13---------S14 | | | | | | | | | | | | S21-----------S22----------S23---------S24 As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed on S11/S21/S14/S24. If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be setup as the order S14->S13->S12->S11 for distribution of label mapping. An= d the shortest path for routes to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is setup. I= f one node (e.g. S13) does not support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the result is that the VPN on S11 cannot take the LSP since the LSP cannot setu= p on S11. If SR-BE path is used as the tunnel for VPN on S11/S14 and assume the S13 c= annot support the SR, according to my understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12. If the analysis is right. I have two questions: 1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example, LSP ping is firstly used to check the connectivity)? 2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. When SR-BE path is adopted in the network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it is impossible to carefully determine the upgraded nodes. So the only choice= is to upgrade all nodes to support SR all at once. is that right that the incremental deployment of SR in such scenar= io is difficult to adopt? Regards, Zhenbin(Robin) --_000_D0DE665989C95jefftantsuraericssoncom_ Content-Type: text/html; charset="Windows-1252" Content-ID: <0C7D309C2E59B74EB1040587B87D6320@ericsson.com> Content-Transfer-Encoding: quoted-printable
Hi Robin,

Your understanding of interworking on Independent and Ordere= d control is incorrect.
Please read RFC5036  sections 2.6.1.1. Independent Label Distribu= tion Control and 2.6.1.2. Ordered Label Distribution Control.

In the case described S13 (Independent) will distribute mapping for S1= 4 without need to receive it from downstream node (that=92s why it is calle= d Independent). S12(Ordered) will then send it to its upstream 

The general issue with Independent is described in section 2.6.1.1. In= dependent Label Distribution Control and is not SR related.
=93A consequence of using independent mode is that an upstream label c= an be advertised before a downstream label is received.=94

Hope this clarifies,

Cheers,
Jeff

From: Lizhenbin <lizhenbin@huawei.com>
Date: Thursday, January 15, 2015 at= 5:12 AM
To: "spring@ietf.org" <= spring@ietf.org>
Subject: [spring] New Comments on S= egment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental= Deployment

Hi all authors of segment routing,

 

When we did research on segment routing and found= some new issues. Could you help clarify if the analysis is right and

how will they be taken into account in the design= of SR.

 

This is the first issue.

        &= nbsp;           &nbs= p;      (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

result is that the VPN on S11 cannot take the LSP since the LSP can= not setup on S11. 

If SR-BE path is used as the tunnel for VPN on S11/S14 and assume the S1= 3 cannot support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If the analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?
2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. When SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is impossible to carefully determine the upgraded nodes. So the only cho= ice is to upgrade all nodes to support SR all

at once. is that right that the incremental deplo= yment of SR in such scenario is difficult to adopt?

 

 

Regards,

Zhenbin(Robin)

 --_000_D0DE665989C95jefftantsuraericssoncom_-- From nobody Sat Jan 17 21:07:59 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 75A7C1ACE68 for ; Sat, 17 Jan 2015 21:07:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 3.639 X-Spam-Level: *** X-Spam-Status: No, score=3.639 tagged_above=-999 required=5 tests=[BAYES_40=-0.001, CHARSET_FARAWAY_HEADER=3.2, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 hmqh61RaLr4x for ; Sat, 17 Jan 2015 21:07:53 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B13791ACE3F for ; Sat, 17 Jan 2015 21:07:52 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml405-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BOD61016; Sun, 18 Jan 2015 05:07:50 +0000 (GMT) Received: from NKGEML401-HUB.china.huawei.com (10.98.56.32) by lhreml405-hub.china.huawei.com (10.201.5.242) with Microsoft SMTP Server (TLS) id 14.3.158.1; Sun, 18 Jan 2015 05:07:49 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml401-hub.china.huawei.com ([10.98.56.32]) with mapi id 14.03.0158.001; Sun, 18 Jan 2015 13:07:42 +0800 From: Lizhenbin To: "bruno.decraene@orange.com" , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMgACIGuXAAXqO7qw== Date: Sun, 18 Jan 2015 05:07:41 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477259B0@nkgeml506-mbx.china.huawei.com> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com> <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup>, <14070_1421394935_54B8C3F7_14070_10706_1_efbf4bbc-187a-4570-aebd-774222e5c74e@PEXCVZYH01.corporate.adroot.infra.ftgroup> In-Reply-To: <14070_1421394935_54B8C3F7_14070_10706_1_efbf4bbc-187a-4570-aebd-774222e5c74e@PEXCVZYH01.corporate.adroot.infra.ftgroup> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477259B0nkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] =?gb2312?b?tPC4tDogTmV3IENvbW1lbnRzIG9uIFNlZ21lbnQgUm91?= =?gb2312?b?dGluZygxKTogQ2hhbGxlbmdlIG9mIE9yZGVyZWQgbW9kZSBmb3IgU1ItQkUg?= =?gb2312?b?UGF0aCBhbmQgSW5jcmVtZW50YWwgRGVwbG95bWVudA==?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi Bruno,

Please refer to my comments inline identified by '[Robin]'.

 

Regards,

Robin

 

=B7=A2=BC=FE=C8=CB: bruno.decraene@orange.= com [bruno.decraene@orange.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C216=C8=D5 15:55
=CA=D5=BC=FE=C8=CB: DECRAENE Bruno IMT/OLN; Lizhenbin; spring@ietf.o= rg
=D6=F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

1 correction inlined. [Brun= o2]

 

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@orange.com
Sent: Thursday, January 15, 2015 4:57 PM
[=A1=AD]=

 

This= is the first issue.[Bruno]

My understanding of your case is the following,= please correct me if I=A1=AFm wrong:

There is no SPRING/SR. All nodes support LDP. S= 11, S12, S14 use ordered mode. S13 use independent mode.

[Robin] I don't mean S13 use independent mode. = I mean S13 doesn't support LDP. That is S13 is a non-LDP node.

 

 

First, such cases happen today in multiple vend= or networks since different implementation used different options.

Then, I believe that your understanding of LDP = independant mode  is incorrect. In independent mode, S13 always advert= ises the S14 FEC to its neighbor, even if it don=A1=AFt gets a label mapping from its downstream S14. This FEC is th= en propagated to S11 in ordered mode.

As a result, S11 gets a label for S14 and will = use S14 for the VPN. However in the forwarding plane the traffic will be dr= opped on S13.

[Robin] Please rethink the use case taking into= account that S13 cannot supported in LDP. Since S13 cannot send the label = mapping to S12, this means S12 cannot receive the label mapping from its exact nexthop for the prefix S14, S12 w= ill not send the label mapping for S14  to S11.

 

 

[Bruno2] I withdraw my last sentence. In this f= ist cast, traffic is not dropped. It works fine. We only lose the propagati= on of LDP FEC status in the control plane.

[Robin] I could not understand your point. In f= act, this case is simple. It just explain that if the ordered LDP is increm= entally deployed, the traffic can be dropped at the ingress node without leaking the traffic into the network.<= /span>

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--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477259B0nkgeml506mbxchi_-- From nobody Sat Jan 17 21:09:58 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 93F241ACE3F for ; Sat, 17 Jan 2015 21:09:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.74 X-Spam-Level: * X-Spam-Status: No, score=1.74 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CHARSET_FARAWAY_HEADER=3.2, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 aK0kVVW4e5xU for ; Sat, 17 Jan 2015 21:09:47 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A37981ACD95 for ; Sat, 17 Jan 2015 21:09:46 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml405-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BOD61084; Sun, 18 Jan 2015 05:09:45 +0000 (GMT) Received: from NKGEML403-HUB.china.huawei.com (10.98.56.34) by lhreml405-hub.china.huawei.com (10.201.5.242) with Microsoft SMTP Server (TLS) id 14.3.158.1; Sun, 18 Jan 2015 05:09:44 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml403-hub.china.huawei.com ([10.98.56.34]) with mapi id 14.03.0158.001; Sun, 18 Jan 2015 13:09:39 +0800 From: Lizhenbin To: "bruno.decraene@orange.com" , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMgAIEFJYU= Date: Sun, 18 Jan 2015 05:09:38 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269BE@nkgeml506-mbx.china.huawei.com> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com>, <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup> In-Reply-To: <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477269BEnkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] =?gb2312?b?tPC4tDogTmV3IENvbW1lbnRzIG9uIFNlZ21lbnQgUm91?= =?gb2312?b?dGluZygxKTogQ2hhbGxlbmdlIG9mIE9yZGVyZWQgbW9kZSBmb3IgU1ItQkUg?= =?gb2312?b?UGF0aCBhbmQgSW5jcmVtZW50YWwgRGVwbG95bWVudA==?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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=B7=A2=BC=FE=C8=CB: bruno.decraene@orange.= com [bruno.decraene@orange.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C215=C8=D5 23:56
=CA=D5=BC=FE=C8=CB: Lizhenbin; spring@ietf.org
=D6=F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

Hi Robin,

 

Thanks for your interest on= SR/SPRING.

Please see inline. [Bruno]

 

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Thursday, January 15, 2015 2:12 PM
To: spring@ietf.org
Subject: [spring] New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

 

Hi a= ll authors of segment routing,

 

When= we did research on segment routing and found some new issues. Could you he= lp clarify if the analysis is right and

how = will they be taken into account in the design of SR.

 

This= is the first issue.[Bruno]

My understanding of your case is the following,= please correct me if I=A1=AFm wrong:

There is no SPRING/SR. All nodes support LDP. S= 11, S12, S14 use ordered mode. S13 use independent mode.

 

First, such cases happen today in multiple vend= or networks since different implementation used different options.

Then, I believe that your understanding of LDP = independant mode  is incorrect. In independent mode, S13 always advert= ises the S14 FEC to its neighbor, even if it don=A1=AFt gets a label mapping from its downstream S14. This FEC is th= en propagated to S11 in ordered mode.

As a result, S11 gets a label for S14 and will = use S14 for the VPN. However in the forwarding plane the traffic will be dr= opped on S13.

 

 

If SR-BE path is used as the tunnel for VPN on S11/S14 and assum= e the S13 = cannot support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If t= he analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?

[Bruno] A priori, I could see 3 answers<= /p>

-a- I guess one could use IGP multi-topology to= handle a different topology between the IP and the MPLS one. This is simil= ar to IPv6 introduction in a IPv4 network.

-b- Another option is to enable interworking be= tween LDP and SR/SPRING to handle such incremental deployment. Please see t= he following draft for an introduction on this interworking: https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp-inter= op-02 Comments are welcomed as I agree with you that=A1=AFs an importan= t topic for brownfield incremental deployment

-c- Another option is to incrementally deploy S= R in addition to LDP and to prefer LDP for end to end LSP (using administra= tive distance). Then it=A1=AFs up to each SR application to see how much they can take benefit of partial SR deploym= ent. e.g. FRR (TI-LFA, RLFA or DLFA) may/should be able to benefit from par= tial deployment.

 

FYI, as of today/myself I say that =A1=B0b=A1= =B1 is required and =A1=B0c=A1=B1 is nice to have.


2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. = When SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is i= mpossible to carefully determine the upgraded nodes. [Bruno] I=A1=AFm not sure to correctly understa= nd your last sentence. Within an AS (well area/level) It is possible to ide= ntify nodes which are SR/SPRING compliant (or non compliant) as they advertise this in the link state IGP.

 

 

So the only choice is to upgrade all nodes to support SR all at = once.

[Bruno] No.

 

is that right that the incremental deployment of SR in such scen= ario is difficult to adopt?

 

 

 

Regards,

Zhenbin(Robin)

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Hi Bruno,

Please refer to my comments inline identified by '[Robin]'.

For LDP, there are two LDP control modes:

-- Ordered mode: Depend on the egress and the downstream node

-- Independent mode: Depend on the downstream node.

In fact, SR is based on IGP and introduces one totally different mode wh= ich I called as flooding mode.

-- Flooding mode: Depend the node's self

Comparing the there mode, the flooding mode is more independent. This me= ans it is the essiest one to

set up the interrupted LSP and leak the useless traffic into the network= which will have negative effect

on the normal traffic in the network.

 

 

Best Regards,

Robin

 

 

=B7=A2=BC=FE=C8=CB: bruno.decraene@orange.= com [bruno.decraene@orange.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C215=C8=D5 23:56
=CA=D5=BC=FE=C8=CB: Lizhenbin; spring@ietf.org
=D6=F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

Hi Robin,

 

Thanks for your interest on= SR/SPRING.

Please see inline. [Bruno]

 

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Thursday, January 15, 2015 2:12 PM
To: spring@ietf.org
Subject: [spring] New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

 

Hi a= ll authors of segment routing,

 

When= we did research on segment routing and found some new issues. Could you he= lp clarify if the analysis is right and

how = will they be taken into account in the design of SR.

 

This= is the first issue.[Bruno]

My understanding of your case is the following,= please correct me if I=A1=AFm wrong:

There is no SPRING/SR. All nodes support LDP. S= 11, S12, S14 use ordered mode. S13 use independent mode.

 

First, such cases happen today in multiple vend= or networks since different implementation used different options.

Then, I believe that your understanding of LDP = independant mode  is incorrect. In independent mode, S13 always advert= ises the S14 FEC to its neighbor, even if it don=A1=AFt gets a label mapping from its downstream S14. This FEC is th= en propagated to S11 in ordered mode.

As a result, S11 gets a label for S14 and will = use S14 for the VPN. However in the forwarding plane the traffic will be dr= opped on S13.

[Robin] It has explained in the previous mail. = Please rethink the case that S13 does not support LDP instead of that S13 s= upport independent mode.

 

 

 

If SR-BE path is used as the tunnel for VPN on S11/S14 and assum= e the S13 = cannot support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If t= he analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?

[Bruno] A priori, I could see 3 answers<= /p>

-a- I guess one could use IGP multi-topology to= handle a different topology between the IP and the MPLS one. This is simil= ar to IPv6 introduction in a IPv4 network.

-b- Another option is to enable interworking be= tween LDP and SR/SPRING to handle such incremental deployment. Please see t= he following draft for an introduction on this interworking: https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp-inter= op-02 Comments are welcomed as I agree with you that=A1=AFs an importan= t topic for brownfield incremental deployment

[Robin] I do not think multi-topoloty and SR-LD= P interop will propose can not solved the issued. But the price is high. In= fact, I have read the draft. But I do not think think it is an easy work according to the past experience in = the MPLS world. I will explain the possible work should be taken into accou= nt in the subsequent comments. A small example, SR claimed it can replace t= he IGP-LDP sync. But as a developer, I am sure that the effort of implementation of SR-LDP interop is much= more than IGP-LDP sync. Can I say that in fact SR does not save our effort= , but make more trouble?

 

-c- Another option is to incrementally deploy S= R in addition to LDP and to prefer LDP for end to end LSP (using administra= tive distance). Then it=A1=AFs up to each SR application to see how much they can take benefit of partial SR deploym= ent. e.g. FRR (TI-LFA, RLFA or DLFA) may/should be able to benefit from par= tial deployment.

[Robin] The difficulty is that the ingress node= cannot determine if the SR-BE path is end-to-end without extra methods whi= ch is unnecessary for the LDP already deployed in the whole network.

 

FYI, as of today/myself I say that =A1=B0b=A1= =B1 is required and =A1=B0c=A1=B1 is nice to have.


2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. = When SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is i= mpossible to carefully determine the upgraded nodes. [Bruno] I=A1=AFm not sure to correctly understa= nd your last sentence. Within an AS (well area/level) It is possible to ide= ntify nodes which are SR/SPRING compliant (or non compliant) as they advertise this in the link state IGP.

[Robin] I agree your proposed the incremen= tal deployment method by IGP extension to identifed the SR-node. This is no= t what my objective. My case is to show that the scope of end-to-end LSP and the scope of the SR nodes is different. Th= e incremental deployment of SR cause the issue for the end-to-end LSP.

 

 

So the only choice is to upgrade all nodes to support SR all at = once.

[Bruno] No.

[Robin] I can agree you that it may be necessar= y. But more details be taken into account and the price may be high and .

 

is that right that the incremental deployment of SR in such scen= ario is difficult to adopt?

 

 

 

Regards,

Zhenbin(Robin)

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Thank you.
--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477269D7nkgeml506mbxchi_-- From nobody Sat Jan 17 22:27:53 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6BA9F1ACE9A; Sat, 17 Jan 2015 22:27:49 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 a61Ga9k0RkuE; Sat, 17 Jan 2015 22:27:47 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3A4F21ACE2E; Sat, 17 Jan 2015 22:27:47 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml406-hub.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BRL63098; Sun, 18 Jan 2015 06:27:45 +0000 (GMT) Received: from NKGEML403-HUB.china.huawei.com (10.98.56.34) by lhreml406-hub.china.huawei.com (10.201.5.243) with Microsoft SMTP Server (TLS) id 14.3.158.1; Sun, 18 Jan 2015 06:27:43 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml403-hub.china.huawei.com ([10.98.56.34]) with mapi id 14.03.0158.001; Sun, 18 Jan 2015 14:27:38 +0800 From: Lizhenbin To: "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(2): Challenge of Proxy Egress for SR-BE Path Thread-Index: AdAy5zNQlgE+8KxmSiyUMl/Nw1wAtw== Date: Sun, 18 Jan 2015 06:27:37 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269F1@nkgeml506-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477269F1nkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "mpls@ietf.org" Subject: [spring] New Comments on Segment Routing(2): Challenge of Proxy Egress for SR-BE Path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi all authors of segment routing,

 

This is the second issue. In order for better understanding and discussi= on, I include MPLS WG in the discussion.


I will propose one use case of LDP proxy egress: Inter-AS VPN Option C

 

  PE11--------ASBR11--------ASBR21-------PE21
   |          &= nbsp;  |          &n= bsp; |           |
   |    AS1      | &= nbsp;          |  &n= bsp; AS2    |
   |          &= nbsp;  |          &n= bsp; |           |
  PE12--------ASBR12--------ASBR22-------PE22


In this case, the label BGP(RFC3107) can advertise the label route for PE21= and PE22 from the ASBR in AS2 to the ASBR in AS1.
Some carriers prefers to use label BGP to go on to advertise the label rout= e to PE11 and PE12. But some carriers do not like full
mesh BGP peers and three layer label for the traffic, they would redistribu= te the BGP routes to IGP at ASBR11/ASBR12 and depend
on LDP to setup LDP LSP for the prefix PE21/PE22 in the AS1.

 

For the use case if the SR is adopted, there may propose following chall= enges:
1. How to configure the SID/label for these proxy egress addresses? On both= ASBR11 and ASBR22? If there more ASBRs, there will be
more configuration work. Is it right?
2. According to seamless MPLS, there may be 10,000 node addresses. If take = the assumption, it will be a great configuration work.
3. The label route on the ASBR can be dymamic changed. Is there the case th= at the more or less SID/Labels are configured?

If my understanding is right, comparing with the simple case with actual= egress, there will be more challenge for the proxy egress

case for SR. In fact, there are more usecases of proxy egress:
1. C & C: Proxy egress for the VPN routes
2. Seamless MPLS: Proxy egress for the LDP DoD

3. Some usecases which needs LDP node and Non-LDP node coexists.

I wonder if you have thought about the proxy egress scenarios and what i= s the possible solution? If the proxy egress cannot be
supported, there will be more challenges:
1. LDP cannot be replaced by SR-BE path. In the above usecase, LDP Proxy Eg= ress and SR actual egress may have to co-existed. It will

be too complexed and SR is totally unnecessary.
2. TI-FRR for the proxy egress case cannot supported either. But this case = can be supported by other FRR solutions.

 

Hope to get your opinion on the progress egress for SR.

 


Regards,
Robin

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477269F1nkgeml506mbxchi_-- From nobody Sun Jan 18 01:34:29 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6091B1ACF5D for ; Sun, 18 Jan 2015 01:34:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.148 X-Spam-Level: X-Spam-Status: No, score=-0.148 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham 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 ZW92J7GrsIdX for ; Sun, 18 Jan 2015 01:34:21 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias243.francetelecom.com [80.12.204.243]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E8AF21AD0B8 for ; Sun, 18 Jan 2015 01:34:20 -0800 (PST) Received: from omfeda05.si.francetelecom.fr (unknown [xx.xx.xx.198]) by omfeda12.si.francetelecom.fr (ESMTP service) with ESMTP id 0B3993B4272; Sun, 18 Jan 2015 10:34:19 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.186]) by omfeda05.si.francetelecom.fr (ESMTP service) with ESMTP id B1AF9180072; Sun, 18 Jan 2015 10:34:18 +0100 (CET) Received: from PEXCVZYM11.corporate.adroot.infra.ftgroup ([fe80::a441:e6a9:6143:6f0f]) by PEXCVZYH01.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0224.002; Sun, 18 Jan 2015 10:34:18 +0100 From: To: Lizhenbin Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMgACIGuXAAXqO7qwAJbX5Q Date: Sun, 18 Jan 2015 09:34:17 +0000 Message-ID: <11971_1421573658_54BB7E1A_11971_64_1_53C29892C857584299CBF5D05346208A0EB0855A@PEXCVZYM11.corporate.adroot.infra.ftgroup> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com> <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup>, <14070_1421394935_54B8C3F7_14070_10706_1_efbf4bbc-187a-4570-aebd-774222e5c74e@PEXCVZYH01.corporate.adroot.infra.ftgroup> <5A5B4DE12C0DAC44AF501CD9A2B01A8D477259B0@nkgeml506-mbx.china.huawei.com> In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477259B0@nkgeml506-mbx.china.huawei.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.197.38.2] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A0EB0855APEXCVZYM11corpo_" MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2014.12.16.134821 Archived-At: Cc: "spring@ietf.org" Subject: Re: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi Robin,

 <= /p>

Please ref= er to my comments inline identified by '[Bruno2]'.

 

Regards,

Bruno

 <= /p>

From: Lizhenbi= n [mailto:lizhenbin@huawei.com]
Sent: Sunday, January 18, 2015 6:08 AM
To: DECRAENE Bruno IMT/OLN; spring@ietf.org
Subject: ??: New Comments on Segment Routing(1): Challenge of Ordere= d mode for SR-BE Path and Incremental Deployment

 

Hi Bruno,

Please refer to my comments inline identified by= '[Robin]'.

 

Regards,

Robin

 

=B7=A2=BC=FE=C8=CB<= span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Tahoma"= ;,"sans-serif";color:black">: bruno.decraene@orange.com [bruno.decraene@orange.com]
=B7= =A2=CB=CD=CA=B1=BC=E4:= 2015=C4= =EA1=D4=C216=C8=D5 15:55
=CA= =D5=BC=FE=C8=CB: DECRAENE Bruno IMT/OLN; Lizhenbin; spring@ietf.org=
=D6= =F7=CC=E2:<= span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Tahoma"= ;,"sans-serif";color:black"> RE: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-B= E Path and Incremental Deployment

1 correcti= on inlined. [Bruno2]

 =

From: = spring [mailto:spring-bounces@ie= tf.org] On Behalf Of bruno.decr= aene@orange.com
Sent: Thursday, January 15, 2015 4:57 PM
[=A1=AD]

 

This is= the first issue.

 &= nbsp;           &nbs= p;             = (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

result = is that the VPN on S11 cannot take the LSP since the LSP cannot setup = on S11. 

[Bruno]

My understanding of your case = is the following, please correct me if I=A1=AFm wrong:

There is no SPRING/SR. All nod= es support LDP. S11, S12, S14 use ordered mode. S13 use independent mode.

[Robin] I don't mean S13 use i= ndependent mode. I mean S13 doesn't support LDP. That is S13 is a non-LDP n= ode.

[Bruno2] ok. In this case you = are right that the LSP is interrupted and the control plane vision is diffe= rent between ordered and independent mode. This is a point which is specific to LDP and 15 years old, and not related to SPRING.

 

/Bruno

 

First, such cases happen today= in multiple vendor networks since different implementation used different = options.

Then, I believe that your unde= rstanding of LDP independant mode  is incorrect. In independent mode, = S13 always advertises the S14 FEC to its neighbor, even if it don=A1=AFt gets a label mapping from its downstream S14. This FEC is then = propagated to S11 in ordered mode.

As a result, S11 gets a label = for S14 and will use S14 for the VPN. However in the forwarding plane the t= raffic will be dropped on S13.

[Robin] Please rethink the use= case taking into account that S13 cannot supported in LDP. Since S13 canno= t send the label mapping to S12, this means S12 cannot receive the label mapping from its exact nexthop for the prefix S14, S12 will not = send the label mapping for S14  to S11.

 

 

[Bruno2] I withdraw my last se= ntence. In this fist cast, traffic is not dropped. It works fine. We only l= ose the propagation of LDP FEC status in the control plane.[Robin] I could not understand= your point. In fact, this case is simple. It just explain that if the orde= red LDP is incrementally deployed, the traffic can be dropped at the ingress node without leaking the traffic into the network.

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modified, changed or falsified.
Thank you.
--_000_53C29892C857584299CBF5D05346208A0EB0855APEXCVZYM11corpo_-- From nobody Sun Jan 18 02:13:09 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9A2C01AD0D1 for ; Sun, 18 Jan 2015 02:13:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.148 X-Spam-Level: X-Spam-Status: No, score=-0.148 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham 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 Aubdy7p-uaEk for ; Sun, 18 Jan 2015 02:13:04 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias243.francetelecom.com [80.12.204.243]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7D0A01AD0C8 for ; Sun, 18 Jan 2015 02:13:03 -0800 (PST) Received: from omfeda06.si.francetelecom.fr (unknown [xx.xx.xx.199]) by omfeda12.si.francetelecom.fr (ESMTP service) with ESMTP id ED6993B4227; Sun, 18 Jan 2015 11:13:01 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.183]) by omfeda06.si.francetelecom.fr (ESMTP service) with ESMTP id D5E34C809F; Sun, 18 Jan 2015 11:13:01 +0100 (CET) Received: from PEXCVZYM11.corporate.adroot.infra.ftgroup ([fe80::a441:e6a9:6143:6f0f]) by PEXCVZYH02.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0224.002; Sun, 18 Jan 2015 11:13:01 +0100 From: To: Lizhenbin , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMgAIEUtV0ACVGPwA== Date: Sun, 18 Jan 2015 10:13:00 +0000 Message-ID: <25686_1421575981_54BB872D_25686_9686_1_53C29892C857584299CBF5D05346208A0EB085CD@PEXCVZYM11.corporate.adroot.infra.ftgroup> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com>, <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup> <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269D7@nkgeml506-mbx.china.huawei.com> In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269D7@nkgeml506-mbx.china.huawei.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.197.38.4] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A0EB085CDPEXCVZYM11corpo_" MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.1.18.2424 Archived-At: Subject: Re: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi Robin,<= o:p>

 = ;

Please see= inline [Bruno2]

 = ;

Regards,

Bruno=

 = ;

From: Lizhenbi= n [mailto:lizhenbin@huawei.com]
Sent: Sunday, January 18, 2015 6:41 AM
To: DECRAENE Bruno IMT/OLN; spring@ietf.org
Subject: ??: New Comments on Segment Routing(1): Challenge of Ordere= d mode for SR-BE Path and Incremental Deployment

 

Hi Bruno,

Please refer to my comments inline identified by= '[Robin]'.

For LDP, there are two LDP control modes:

-- Ordered mode: Depend on the egress and t= he downstream node

-- Independent mode: Depend on the downstream no= de.

In fact, SR is based on IGP and introduces one t= otally different mode which I called as flooding mode.

-- Flooding mode: Depend the node's self

[Bruno2] I=A1=AFm not sure to = see what you mean by =A1=B0depend=A1=B1.

In LDP ordered mode, there is = a signaling end to end from the egress to the ingress, roughly a la =A1=B0d= istance vector=A1=B1.

In LDP independent mode, the s= ignaling is limited to be 2 adjacent nodes (me, my downstream). So roughly = no signaling.

In SPRING, the Link State para= digm is used. You know the status of the egress and all the links  &am= p; nodes.

 

Comparing the there mode, the flo= oding mode is more independent. This means it is the essiest one to

set up the interrupted LSP and leak the useless = traffic into the network which will have negative effect

on the normal traffic in the network.=

[Bruno2] I disagree. You have = the link state vision of the whole SPRING network. That=A1=AFs the =A1=B0mo= de=A1=B1 which provides the more information. Speci= fically,

 You know that the egress is =A1=B0up=A1=B1 and that al= l nodes on the way are also =A1=B0up=A1=B1 and ready (I do mean from a SPRING/MPLS standpoint).

Obviously, this is a control p= lan vision only. If you want to check the FIB, you will need to test it (e.= g. LSP Ping)

Best Regards,

Robin

 

 

=B7=A2=BC=FE=C8=CB<= span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Tahoma"= ;,"sans-serif";color:black">: bruno.decraene@orange.com [bruno.decraene@orange.com]
=B7= =A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C215=C8=D5 23:56
=CA= =D5=BC=FE=C8=CB: Lizhenbin; spring@ietf.org
=D6= =F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path a= nd Incremental Deployment

Hi Robin,

 =

Thanks for= your interest on SR/SPRING.<= /span>

Please see inline. [Bruno= ]

 =

From: spring [mailto:s= pring-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Thursday, January 15, 2015 2:12 PM
To: spring@ietf.org
Subject: [spring] New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

 =

Hi all = authors of segment routing,

 

When we= did research on segment routing and found some new issues. Could you help = clarify if the analysis is right and

how wil= l they be taken into account in the design of SR.

 

This is= the first issue.

 &= nbsp;           &nbs= p;             = (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

result = is that the VPN on S11 cannot take the LSP since the LSP cannot setup = on S11. 

[Bruno]

My understanding of your case = is the following, please correct me if I=A1=AFm wrong:

There is no SPRING/SR. All nod= es support LDP. S11, S12, S14 use ordered mode. S13 use independent mode.

 

First, such cases happen today= in multiple vendor networks since different implementation used different = options.

Then, I believe that your unde= rstanding of LDP independant mode  is incorrect. In independent mode, = S13 always advertises the S14 FEC to its neighbor, even if it don=A1=AFt gets a label mapping from its downstream S14. This FEC is then = propagated to S11 in ordered mode.

As a result, S11 gets a label = for S14 and will use S14 for the VPN. However in the forwarding plane the t= raffic will be dropped on S13.

[Robin] It has explained in th= e previous mail. Please rethink the case that S13 does not support LDP inst= ead of that S13 support independent mode.

 

 

 

If SR-BE path is used as the tunnel for VPN on S11/S14 and assume t= he S13 can= not support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If the = analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?=

[Bruno] A priori, I could see = 3 answers

-a- I guess one could use IGP = multi-topology to handle a different topology between the IP and the MPLS o= ne. This is similar to IPv6 introduction in a IPv4 network.-b- Another option is to enabl= e interworking between LDP and SR/SPRING to handle such incremental deploym= ent. Please see the following draft for an introduction on this interworking: https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp-inter= op-02 Comments are welcomed as I agree with you that=A1=AFs an importan= t topic for brownfield incremental deployment<= /span>

[Robin] I do not think multi-t= opoloty and SR-LDP interop will propose can not solved the issued.

[Bruno2] Not sure why you use = double negation. But in short, you also believe this should work.

 

[Robin]

But the price is high. In fact= , I have read the draft. But I do not think think it is an easy work accord= ing to the past experience in the MPLS world. I will explain the possible work should be taken into account in the subsequent comments.= A small example, SR claimed it can replace the IGP-LDP sync. But as a deve= loper, I am sure that the effort of implementation of SR-LDP interop i= s much more than IGP-LDP sync. Can I say that in fact SR does not save our effort, but make more trouble?

[Bruno2] The use of SR-LDP int= erwork allows incremental deployment of SR with incremental benefit but is indeed an additional work. It is only needed in a multi-ven= dor/plateform network when all nodes do not support SR, for a limited = duration. It=A1=AFs not long term feature. If you ask me, I would rather no= t have to use it, but it depends on the willing of vendors to implement the required IGP sub-TLVs. If we all agree that im= plementing such sub-TLV is easier and better (or if you assume mono vendor = deployment, which I don=A1=AFt) we won=A1=AFt need to deploy/implement LDP-= SPRING interworking. This is a roadmap versus deployment date issue, so a bit out of scope of this mailing list. However= , from the mailing list standpoint, the point is that this can be done (spe= cified and implemented)<= /p>

 

-c- Another option is to incre= mentally deploy SR in addition to LDP and to prefer LDP for end to end LSP = (using administrative distance). Then it=A1=AFs up to each SR application to see how much they can take benefit of partial SR deployment= . e.g. FRR (TI-LFA, RLFA or DLFA) may/should be able to benefit from partia= l deployment.

[Robin] The difficulty is that= the ingress node cannot determine if the SR-BE path is end-to-end without = extra methods which is unnecessary for the LDP already deployed in the whole network.

[Bruno2] Again, No. please see https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-03#s= ection-3 The ingress knows, within its IGP area/level, all nodes which = supports SPRING or not. This includes nodes on the SPT to the egress.<= /o:p>

 

 

 

FYI, as of today/myself I say = that =A1=B0b=A1=B1 is required and =A1=B0c=A1=B1 is nice to have.


2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. Whe= n SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is impo= ssible to carefully determine the upgraded nodes.

[Bruno] I=A1=AFm not sure to c= orrectly understand your last sentence. Within an AS (well area/level) It i= s possible to identify nodes which are SR/SPRING compliant (or non compliant) as they advertise this in the link state IGP.

[Robin] I agree your prop= osed the incremental deployment method by IGP extension to identifed the SR= -node. This is not what my objective. My case is to show that the scope of end-to-end LSP and the scope of the SR nodes is different. Th= e incremental deployment of SR cause the issue for the end-to-end LSP.

 [Bruno2] I=A1=AFm not sure to see your point. In particular by =A1= =B0end-to-end=A1=B1 to you mean within an area/level, or across ASes? Because as SPRING uses the IGP,= IGP frontiers makes a difference. Can you please rephrase or bring an non-= working example?

 

So the only choice is to upgrade all nodes to support SR all at onc= e.

[Bruno] No.=

[Robin] I can agree you that i= t may be necessary. But more details be taken into account and the price ma= y be high and .

 

is that right that the incremental deployment of SR in such scenari= o is difficult to adopt?

 

 

 

Regards,

Zhenbin(Robin)

__________________________________________=
___________________________________________________________________________=
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ontenir des informations confidentielles ou privilegiees et ne doivent donc=

pas etre diffuses, exploites ou copies san=
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Orange decline toute responsabilite si ce =
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pied without authorisation.
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Ce message et ses pieces jointes peuvent contenir des informations confiden=
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This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
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--_000_53C29892C857584299CBF5D05346208A0EB085CDPEXCVZYM11corpo_-- From nobody Sun Jan 18 02:40:03 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6F2F21AD0D1; Sun, 18 Jan 2015 02:39:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.302 X-Spam-Level: X-Spam-Status: No, score=0.302 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, J_CHICKENPOX_41=0.6, MANGLED_SIDE=2.3, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=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 BHWU1v7XelOC; Sun, 18 Jan 2015 02:39:51 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias92.francetelecom.com [193.251.215.92]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A75981AC39B; Sun, 18 Jan 2015 02:39:50 -0800 (PST) Received: from omfedm07.si.francetelecom.fr (unknown [xx.xx.xx.3]) by omfedm12.si.francetelecom.fr (ESMTP service) with ESMTP id 456AC18C1CF; Sun, 18 Jan 2015 11:39:48 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.183]) by omfedm07.si.francetelecom.fr (ESMTP service) with ESMTP id 2521D4C086; Sun, 18 Jan 2015 11:39:48 +0100 (CET) Received: from PEXCVZYM11.corporate.adroot.infra.ftgroup ([fe80::a441:e6a9:6143:6f0f]) by PEXCVZYH02.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0224.002; Sun, 18 Jan 2015 11:39:47 +0100 From: To: Lizhenbin , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(2): Challenge of Proxy Egress for SR-BE Path Thread-Index: AdAy5zNQlgE+8KxmSiyUMl/Nw1wAtwAIDBtA Date: Sun, 18 Jan 2015 10:39:47 +0000 Message-ID: <32079_1421577588_54BB8D74_32079_13885_1_53C29892C857584299CBF5D05346208A0EB08630@PEXCVZYM11.corporate.adroot.infra.ftgroup> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269F1@nkgeml506-mbx.china.huawei.com> In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269F1@nkgeml506-mbx.china.huawei.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.197.38.4] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A0EB08630PEXCVZYM11corpo_" MIME-Version: 1.0 X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.1.18.83620 Archived-At: Cc: "mpls@ietf.org" Subject: Re: [spring] New Comments on Segment Routing(2): Challenge of Proxy Egress for SR-BE Path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 18 Jan 2015 10:39:55 -0000 --_000_53C29892C857584299CBF5D05346208A0EB08630PEXCVZYM11corpo_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Robin, Thanks for your interest in SPRING/Segment Routing. Please see inline [Bruno] Regards, Bruno From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Lizhenbin Sent: Sunday, January 18, 2015 7:28 AM To: spring@ietf.org Cc: mpls@ietf.org Subject: [mpls] New Comments on Segment Routing(2): Challenge of Proxy Egre= ss for SR-BE Path Hi all authors of segment routing, This is the second issue. In order for better understanding and discussion,= I include MPLS WG in the discussion. I will propose one use case of LDP proxy egress: Inter-AS VPN Option C PE11--------ASBR11--------ASBR21-------PE21 | | | | | AS1 | | AS2 | | | | | PE12--------ASBR12--------ASBR22-------PE22 In this case, the label BGP(RFC3107) can advertise the label route for PE21= and PE22 from the ASBR in AS2 to the ASBR in AS1. Some carriers prefers to use label BGP to go on to advertise the label rout= e to PE11 and PE12. But some carriers do not like full mesh BGP peers and three layer label for the traffic, they would redistribu= te the BGP routes to IGP at ASBR11/ASBR12 and depend on LDP to setup LDP LSP for the prefix PE21/PE22 in the AS1. For the use case if the SR is adopted, there may propose following challeng= es: 1. How to configure the SID/label for these proxy egress addresses? [Bruno] I a priori see 3 options, but this is open for discussion 1- If you want to use MPLS hierarchy. ASBR1x advertise in IGP the SIDs= /MPLS labels as local labels. PE11 will need to use a 2 label stack: Node_S= ID(ASBR1x), Prefix_SID (PE2y). 2- If you don't want to use MPLS hierarchy: a. ASBR1x only advertise the IP reachability. The SID mapping is adve= rtised by the mapping server. b. Assuming AS2 also use SPRING, then the real issue is the redistribu= tion between protocols. IGP->BGP->IGP. This can be done with a BGP extensio= n to carry the SID. e.g. https://tools.ietf.org/html/draft-keyupate-idr-bgp= -prefix-sid-00 On both ASBR11 and ASBR22? If there more ASBRs, there will be more configur= ation work. Is it right? [Bruno] no, see above with 3 solutions. Others could be discussed if needed. 2. According to seamless MPLS, there may be 10,000 node addresses. If take = the assumption, it will be a great configuration work. 3. The label route on the ASBR can be dymamic changed. Is there the case th= at the more or less SID/Labels are configured? [Bruno] I don't see what you mean. If my understanding is right, comparing with the simple case with actual eg= ress, there will be more challenge for the proxy egress case for SR. In fact, there are more usecases of proxy egress: 1. C & C: Proxy egress for the VPN routes 2. Seamless MPLS: Proxy egress for the LDP DoD [Bruno] For the downstream direction (signaling toward upstream), If you us= e BGP, you can still use BGP. If you use IGP cf solutions 1 & 2.a above. 3. Some usecases which needs LDP node and Non-LDP node coexists. I wonder if you have thought about the proxy egress scenarios and what is t= he possible solution? If the proxy egress cannot be supported, there will be more challenges: 1. LDP cannot be replaced by SR-BE path. In the above usecase, LDP Proxy Eg= ress and SR actual egress may have to co-existed. It will be too complexed and SR is totally unnecessary. 2. TI-FRR for the proxy egress case cannot supported either. But this case = can be supported by other FRR solutions. [Bruno] TI-FRR protects solutions using the IGP (1 & 2.a). Node protecting BGP destination is possible (e.g. draft-minto-2547-egress-n= ode-fast-protection) but this is a different story. /Bruno Hope to get your opinion on the progress egress for SR. Regards, Robin ___________________________________________________________________________= ______________________________________________ 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. --_000_53C29892C857584299CBF5D05346208A0EB08630PEXCVZYM11corpo_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Robin,<= o:p>

 = ;

Thanks for= your interest in SPRING/Segment Routing.

Please see= inline [Bruno]

 = ;

Regards,

Bruno=

 = ;

From: mpls [ma= ilto:mpls-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Sunday, January 18, 2015 7:28 AM
To: spring@ietf.org
Cc: mpls@ietf.org
Subject: [mpls] New Comments on Segment Routing(2): Challenge of Pro= xy Egress for SR-BE Path

 

Hi all = authors of segment routing,

 <= o:p>

This is= the second issue. In order for better understanding and discussion, I incl= ude MPLS WG in the discussion.


I will propose one use case of LDP proxy egress: Inter-AS VPN Option C=

 <= o:p>

  = PE11--------ASBR11--------ASBR21-------PE21
   |          &= nbsp;  |          &n= bsp; |           |
   |    AS1      | &= nbsp;          |  &n= bsp; AS2    |
   |          &= nbsp;  |          &n= bsp; |           |
  PE12--------ASBR12--------ASBR22-------PE22


In this case, the label BGP(RFC3107) can advertise the label route for PE21= and PE22 from the ASBR in AS2 to the ASBR in AS1.
Some carriers prefers to use label BGP to go on to advertise the label rout= e to PE11 and PE12. But some carriers do not like full
mesh BGP peers and three layer label for the traffic, they would redistribu= te the BGP routes to IGP at ASBR11/ASBR12 and depend
on LDP to setup LDP LSP for the prefix PE21/PE22 in the AS1.

 <= o:p>

For the= use case if the SR is adopted, there may propose following challenges:
1. How to configure the SID/label for these proxy egress addresses?<= span style=3D"font-size:10.0pt;font-family:Courier;color:#1F497D">

[Bruno] I a priori see 3 optio= ns, but this is open for discussion

1-      If= you want to use MPLS hierarchy. ASBR1x advertise in IGP the SIDs/MPLS labe= ls as local labels. PE11 will need to use a 2 label stack: Node_SID(ASBR1x), Prefix_SID (PE2y).

2-      If= you don’t want to use MPLS hierarchy:

a.       AS= BR1x only advertise the IP reachability. The SID mapping is advertised by t= he mapping server.

b.      As= suming AS2 also use SPRING, then the real issue is the redistribution betwe= en protocols. IGP->BGP->IGP. This can be done with a BGP extension to carry the SID. e.g. https://tools.ietf.org/html/draft-keyupate-idr-bgp-prefix-sid-00

<= o:p> 

 

On both ASBR11 and ASBR22? If there more ASBRs, there will be more configuration work. Is = it right?

[Bruno] no, see above with 3 s= olutions. Others could be discussed if needed.


2. According to seamless MPLS, there may be 10,000 node addresses. <= span style=3D"font-size:10.0pt;font-family:Courier;color:black">If take the= assumption, it will be a great configuration work.
3. The label route on the ASBR can be dymamic changed. Is there the case th= at the more or less SID/Labels are configured?

[Bruno] I don’t see what= you mean.

If my understanding is right, comparing with the simple case with a= ctual egress, there will be more challenge for the proxy egress

case fo= r SR. In fact, there are more usecases of proxy egress:
1. C & C: Proxy egress for the VPN routes
2. Seamless MPLS: Proxy egress for the LDP DoD

[Bruno] For the downstream dir= ection (signaling toward upstream), If you use BGP, you can still use BGP. = If you use IGP cf solutions 1 & 2.a above.

3. Some= usecases which needs LDP node and Non-LDP node coexists.=

I wonde= r if you have thought about the proxy egress scenarios and what is the poss= ible solution? If the proxy egress cannot be
supported, there will be more challenges:
1. LDP cannot be replaced by SR-BE path. In the above usecase, LDP Proxy Eg= ress and SR actual egress may have to co-existed. It will

be too = complexed and SR is totally unnecessary.
2. TI-FRR for the proxy egress case cannot supported either. But this case = can be supported by other FRR solutions.

[Bruno] TI-FRR protects soluti= ons using the IGP (1 & 2.a).

Node protecting BGP destinatio= n is possible (e.g. draft-minto-2547-egress-node-fast-protection) but this = is a different story.

 

/Bruno <= /o:p>

Hope to get your opinion on the progress egress for SR.<= /span>

 


Regards,
Robin

______________________________________________________________________=
___________________________________________________

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.
--_000_53C29892C857584299CBF5D05346208A0EB08630PEXCVZYM11corpo_-- From nobody Mon Jan 19 22:42:38 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 748FB1B2D68 for ; Mon, 19 Jan 2015 22:42:34 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.74 X-Spam-Level: * X-Spam-Status: No, score=1.74 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CHARSET_FARAWAY_HEADER=3.2, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 9hP6NrRQnYET for ; Mon, 19 Jan 2015 22:42:27 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7DD211B2C5A for ; Mon, 19 Jan 2015 22:42:26 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml405-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BOF38715; Tue, 20 Jan 2015 06:42:24 +0000 (GMT) Received: from NKGEML404-HUB.china.huawei.com (10.98.56.35) by lhreml405-hub.china.huawei.com (10.201.5.242) with Microsoft SMTP Server (TLS) id 14.3.158.1; Tue, 20 Jan 2015 06:42:23 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml404-hub.china.huawei.com ([10.98.56.35]) with mapi id 14.03.0158.001; Tue, 20 Jan 2015 14:42:19 +0800 From: Lizhenbin To: "bruno.decraene@orange.com" , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMgAIEUtV0ACVGPwABdgjZR Date: Tue, 20 Jan 2015 06:42:19 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D47727D4A@nkgeml506-mbx.china.huawei.com> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com>, <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup> <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269D7@nkgeml506-mbx.china.huawei.com>, <25686_1421575981_54BB872D_25686_9686_1_53C29892C857584299CBF5D05346208A0EB085CD@PEXCVZYM11.corporate.adroot.infra.ftgroup> In-Reply-To: <25686_1421575981_54BB872D_25686_9686_1_53C29892C857584299CBF5D05346208A0EB085CD@PEXCVZYM11.corporate.adroot.infra.ftgroup> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D47727D4Ankgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] =?gb2312?b?tPC4tDogTmV3IENvbW1lbnRzIG9uIFNlZ21lbnQgUm91?= =?gb2312?b?dGluZygxKTogQ2hhbGxlbmdlIG9mIE9yZGVyZWQgbW9kZSBmb3IgU1ItQkUg?= =?gb2312?b?UGF0aCBhbmQgSW5jcmVtZW50YWwgRGVwbG95bWVudA==?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi Bruno,

Please refer to my inline comments identified with '[Robin]'.

 

Regards,

Robin

 

 

=B7=A2=BC=FE=C8=CB: bruno.decraene@orange.= com [bruno.decraene@orange.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C218=C8=D5 18:13
=CA=D5=BC=FE=C8=CB: Lizhenbin; spring@ietf.org
=D6=F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

Hi Robin,

 

Please see inline [Bruno2]<= /span>

 

Regards,

Bruno

 

From: Lizhenbin [mailto:lizhenbin@huawei.com]
Sent: Sunday, January 18, 2015 6:41 AM
To: DECRAENE Bruno IMT/OLN; spring@ietf.org
Subject: ??: New Comments on Segment Routing(1): Challenge of Ordere= d mode for SR-BE Path and Incremental Deployment

 

Hi Bruno,

Please refer to my comments inline identified by '[Robin]'.

For LDP, there are two LDP control modes:

-- Ordered mode: Depend on the egress and the downstream nod= e

-- Independent mode: Depend on the downstream node.

In fact, SR is based on IGP and introduces one totally different = mode which I called as flooding mode.

-- Flooding mode: Depend the node's self

[Bruno2] I=A1=AFm not sure to see what you mean= by =A1=B0depend=A1=B1.

In LDP ordered mode, there is a signaling end t= o end from the egress to the ingress, roughly a la =A1=B0distance vector=A1= =B1.

In LDP independent mode, the signaling is limit= ed to be 2 adjacent nodes (me, my downstream). So roughly no signaling.

In SPRING, the Link State paradigm is used. You= know the status of the egress and all the links  & nodes.<= /p>

[Robin]

1. The 'depend' means the label binding for the= nodes in segment routing is stable, after the label binding are flooded,&n= bsp;for 

every nodes in the network,  once the= re are the routes to the destination nodes address, the ingress LSP can be = setup to be used

for VPN, etc. For LDP independent, even if the = route is available, it has to wait for the label mapping from the downstrea= m to

setup the ingress LDP to be used for VPN, etc.

2. I am not sure what's the link state paradigm= you mean? For LDP, it depends on IGP, it can also use the link state parad= igm.

The only difference is that the segment routing= can use it conveniently since the label binding coexists with link state p= aradigm.

 

 

 

 

Comparing the there mode, the flooding mode is mor= e independent. This means it is the essiest one to

set up the interrupted LSP and leak the useless traffic into the = network which will have negative effect

on the normal traffic in the network.

[Bruno2] I disagree. You have the link state vi= sion of the whole SPRING network. That=A1=AFs the =A1=B0mode=A1=B1 which pr= ovides the more information. Specifically,

 You know that= the egress is =A1=B0up=A1=B1 and that all nodes on the way are also =A1=B0up=A1=B1 and ready (I do mean from a SPRING/MPLS standp= oint).

Obviously, this is a control plan vision only. = If you want to check the FIB, you will need to test it (e.g. LSP Ping)

[Robin]

I understand your point about the control plane= solution to some extent. In fact, I have also thought about solutions for = the the possible

interruption issues for SR-BE path. As to your suggested solution of the control plane, it can be done, but it has been the end-to-= end path

calculation like TE instead of the traditional route path calculation.

 

 

Best Regards,

Robin

 

 

=B7=A2=BC=FE=C8=CB<= span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZE: = 10pt" lang=3D"EN-US">: bruno.decraene@orange.com [bruno.decraene@orange.com]
=B7= =A2=CB=CD=CA=B1=BC=E4: 2015= =C4=EA1=D4=C2 23:56
=CA= =D5=BC=FE=C8=CB: Lizhenbin; spring@iet= f.org
=D6= =F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Pa= th and Incremental Deployment

Hi Robin,

 

Thanks for your interest on= SR/SPRING.

Please see inline. [Bruno]

 

From: spring [mailto:spring-bounces@ie= tf.org] On Behalf Of Lizhenbin
Sent: Thursday, January 15, 2015 2:12 PM
To: spring@ietf= .org
Subject: [spring] New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

 

Hi a= ll authors of segment routing,

 

When= we did research on segment routing and found some new issues. Could you he= lp clarify if the analysis is right and

how = will they be taken into account in the design of SR.

 

This= is the first issue.

&nbs= p;            &= nbsp;           &nbs= p; (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

resu= lt is that the VPN on S11 cannot take the LSP since the LSP cannot set= up on S11. [Bruno]

My understanding of your case is the following,= please correct me if I=A1=AFm wrong:

There is no SPRING/SR. All nodes support LDP. S= 11, S12, S14 use ordered mode. S13 use independent mode.

 

First, such cases happen today in multiple vend= or networks since different implementation used different options.<= /p>

Then, I believe that your understanding of LDP = independant mode  is incorrect. In independent mode, S13 always advert= ises the S14 FEC to its neighbor, even if it don=A1=AFt gets a label mapping from its downstream S14. This FEC is th= en propagated to S11 in ordered mode.

As a result, S11 gets a label for S14 and will = use S14 for the VPN. However in the forwarding plane the traffic will be dr= opped on S13.

[Robin] It has explained in the previous mail. = Please rethink the case that S13 does not support LDP instead of that S13 s= upport independent mode.

 

 

 

If SR-BE path is used as the tunnel for VPN on S11/S14 and assum= e the S13 = cannot support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If t= he analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?

[Bruno] A priori, I could see 3 answers<= span style=3D"FONT-FAMILY: 'Times New Roman','serif'; COLOR: black">=

-a- I guess one could use IGP multi-topology to= handle a different topology between the IP and the MPLS one. This is simil= ar to IPv6 introduction in a IPv4 network.

-b- Another option is to enable interworking be= tween LDP and SR/SPRING to handle such incremental deployment. Please see t= he following draft for an introduction on this interworking: https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp-inter= op-02 Comments are welcomed as I agree with you that=A1=AFs an importan= t topic for brownfield incremental deployment

[Robin] I do not think multi-topoloty and SR-LD= P interop will propose can not solved the issued.

[Bruno2] Not sure why you use double negation. = But in short, you also believe this should work.

 

[Robin]<= /p>

But the price is high. In fact, I have read the= draft. But I do not think think it is an easy work according to the past e= xperience in the MPLS world. I will explain the possible work should be taken into account in the subsequent c= omments. A small example, SR claimed it can replace the IGP-LDP sync. But a= s a developer, I am sure that the effort of implementation of SR-LDP i= nterop is much more than IGP-LDP sync. Can I say that in fact SR does not save our effort, but make more trouble?=

[Bruno2] The use of SR-LDP interwork allows inc= remental deployment of SR with incremental benefit but is indeed an additional work. It is only needed in a multi-ven= dor/plateform network when all nodes do not support SR, for a limited = duration. It=A1=AFs not long term feature. If you ask me, I would rather no= t have to use it, but it depends on the willing of vendors to implement the required IGP sub-TLVs. If we all agree that im= plementing such sub-TLV is easier and better (or if you assume mono vendor = deployment, which I don=A1=AFt) we won=A1=AFt need to deploy/implement LDP-= SPRING interworking. This is a roadmap versus deployment date issue, so a bit out of scope of this mailing list. However= , from the mailing list standpoint, the point is that this can be done (spe= cified and implemented)

 

-c- Another option is to incrementally deploy S= R in addition to LDP and to prefer LDP for end to end LSP (using administra= tive distance). Then it=A1=AFs up to each SR application to see how much they can take benefit of partial SR deploym= ent. e.g. FRR (TI-LFA, RLFA or DLFA) may/should be able to benefit from par= tial deployment.[Robin] The difficulty is that the ingress node= cannot determine if the SR-BE path is end-to-end without extra methods whi= ch is unnecessary for the LDP already deployed in the whole network.

[Bruno2] Again, No. please see https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-03#s= ection-3 The ingress knows, within its IGP area/level, all nodes which = supports SPRING or not. This includes nodes on the SPT to the egress.

 

 

 

FYI, as of today/myself I say that =A1=B0b=A1= =B1 is required and =A1=B0c=A1=B1 is nice to have.


2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. = When SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is i= mpossible to carefully determine the upgraded nodes.

[Bruno] I=A1=AFm not sure to correctly understa= nd your last sentence. Within an AS (well area/level) It is possible to ide= ntify nodes which are SR/SPRING compliant (or non compliant) as they advertise this in the link state IGP.

[Robin] I agree your proposed the incremen= tal deployment method by IGP extension to identifed the SR-node. This is no= t what my objective. My case is to show that the scope of end-to-end LSP and the scope of the SR nodes is different. Th= e incremental deployment of SR cause the issue for the end-to-end LSP.

 [Bruno2] I=A1=AFm not sur= e to see your point. In particular by =A1=B0end-to-end=A1=B1 to you mean within an area/level, or across ASes? Because as SPRING uses t= he IGP, IGP frontiers makes a difference. Can you please rephrase or bring = an non-working example?

 

So the only choice is to upgrade all nodes to support SR all at = once.

[Bruno] No.

[Robin] I can agree you that it may be necessar= y. But more details be taken into account and the price may be high and .<= /span>

 

is that right that the incremental deployment of SR in such scen= ario is difficult to adopt?

 

 

 

Regards,

Zhenbin(Robin)

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Hi Bruno,

Please see inline [Robin]. I clarify my challenges. Hope you rethink it.=

 

Thanks & Regards,

Robin

 

 

=B7=A2=BC=FE=C8=CB: bruno.decraene@orange.= com [bruno.decraene@orange.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C218=C8=D5 18:39
=CA=D5=BC=FE=C8=CB: Lizhenbin; spring@ietf.org
=B3=AD=CB=CD: mpls@ietf.org
=D6=F7=CC=E2: RE: New Comments on Segment Routing(2): Challenge of P= roxy Egress for SR-BE Path

Hi Robin,

 

Thanks for your interest in= SPRING/Segment Routing.

Please see inline [Bruno]

 

Regards,

Bruno

 

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Sunday, January 18, 2015 7:28 AM
To: spring@ietf.org
Cc: mpls@ietf.org
Subject: [mpls] New Comments on Segment Routing(2): Challenge of Pro= xy Egress for SR-BE Path

 

Hi a= ll authors of segment routing,

 

This= is the second issue. In order for better understanding and discussion, I i= nclude MPLS WG in the discussion.


I will propose one use case of LDP proxy egress: Inter-AS VPN Option C

 

&nbs= p; PE11--------ASBR11--------ASBR21-------PE21
   |          &= nbsp;  |          &n= bsp; |           |
   |    AS1      | &= nbsp;          |  &n= bsp; AS2    |
   |          &= nbsp;  |          &n= bsp; |           |
  PE12--------ASBR12--------ASBR22-------PE22


In this case, the label BGP(RFC3107) can advertise the label route for PE21= and PE22 from the ASBR in AS2 to the ASBR in AS1.
Some carriers prefers to use label BGP to go on to advertise the label rout= e to PE11 and PE12. But some carriers do not like full
mesh BGP peers and three layer label for the traffic, they would redistribu= te the BGP routes to IGP at ASBR11/ASBR12 and depend
on LDP to setup LDP LSP for the prefix PE21/PE22 in the AS1.

 

For = the use case if the SR is adopted, there may propose following challenges:<= br> 1. How to configure the SID/label for these proxy egress addresses?<= span style=3D"FONT-FAMILY: Courier; COLOR: #1f497d; FONT-SIZE: 10pt">

[Bruno] I a priori see 3 options, but this is o= pen for discussion

1-   &nbs= p;  If you want to use MPLS hiera= rchy. ASBR1x advertise in IGP the SIDs/MPLS labels as local labels. PE11 wi= ll need to use a 2 label stack: Node_SID(ASBR1x), Prefix_SID (PE2y).

2-   &nbs= p;  If you don=A1=AFt want to use= MPLS hierarchy:

a.   &nbs= p;   ASBR1x only advertise the IP = reachability. The SID mapping is advertised by the mapping server.

b.   &nbs= p;  Assuming AS2 also use SPRING,= then the real issue is the redistribution between protocols. IGP->BGP-&= gt;IGP. This can be done with a BGP extension to carry the SID. e.g. https://tools.ietf.org/html/draft-keyupate-idr-bgp-prefix-sid-00=

 

[Robin] My objective is not to persue the solut= ion. My proposed challenges is as follows:

1) In order to support proxy egress for SR-BE p= ath, we have to configure the SID/label for the proxy egress nodes, so whic= h ASBR we should to choose to configure these SID/label bindings?

2) If there are 10,000 proxy egress addresses p= roposed by seamless MPLS, this means we have to configure 10,000 SID/label = bindings on one ASBR? The huge configuration work cannot be accepted according to my understanding.

3) Since the proxy egress is learned from outsi= de of the network, if configure the static the SID/label for a specific pro= xy egress, but the proxy egress is not learned, the SID/label is wasted. If not

configured, but the proxy egress is learned, th= e SR-BE path does not work. How to cope with the issues?

 

 

 

On both ASBR11 and ASBR22? If there more ASBRs, there will be more configuration work. = Is it right?

[Bruno] no, see above with 3 solutions. Others = could be discussed if needed.


2. According to seamless MPLS, there may be 10,000 node addresses. <= span style=3D"FONT-FAMILY: Courier; COLOR: black; FONT-SIZE: 10pt">If take = the assumption, it will be a great configuration work.
3. The label route on the ASBR can be dymamic changed. Is there the case th= at the more or less SID/Labels are configured?

[Bruno] I don=A1=AFt see what you mean.<= /p>

If my understanding is right, comparing with the simple case wit= h actual egress, there will be more challenge for the proxy egress

case= for SR. In fact, there are more usecases of proxy egress:
1. C & C: Proxy egress for the VPN routes
2. Seamless MPLS: Proxy egress for the LDP DoD

[Bruno] For the downstream direction (signaling= toward upstream), If you use BGP, you can still use BGP. If you use IGP cf= solutions 1 & 2.a above.

3. S= ome usecases which needs LDP node and Non-LDP node coexists.

I wo= nder if you have thought about the proxy egress scenarios and what is the p= ossible solution? If the proxy egress cannot be
supported, there will be more challenges:
1. LDP cannot be replaced by SR-BE path. In the above usecase, LDP Proxy Eg= ress and SR actual egress may have to co-existed. It will

be t= oo complexed and SR is totally unnecessary.
2. TI-FRR for the proxy egress case cannot supported either. But this case = can be supported by other FRR solutions.

[Bruno] TI-FRR protects solutions using the IGP= (1 & 2.a).

Node protecting BGP destination is possible (e.= g. draft-minto-2547-egress-node-fast-protection) but this is a different st= ory.

 

/Bruno 

Hope to get your opinion on the progress egress for SR.

 


Regards,
Robin

______________________________________________________________________=
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Thank you.
--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D47727D58nkgeml506mbxchi_-- From nobody Wed Jan 21 20:58:29 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0BF2B1A916F; Wed, 21 Jan 2015 20:58:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 KPUJxwoCxOgS; Wed, 21 Jan 2015 20:58:26 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E047D1A916E; Wed, 21 Jan 2015 20:58:25 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml402-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BOH43142; Thu, 22 Jan 2015 04:58:24 +0000 (GMT) Received: from NKGEML403-HUB.china.huawei.com (10.98.56.34) by lhreml402-hub.china.huawei.com (10.201.5.241) with Microsoft SMTP Server (TLS) id 14.3.158.1; Thu, 22 Jan 2015 04:54:16 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml403-hub.china.huawei.com ([10.98.56.34]) with mapi id 14.03.0158.001; Thu, 22 Jan 2015 12:54:09 +0800 From: Lizhenbin To: "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(3): Challenge of DoD and Inter-area extensions for SR-BE Path Thread-Index: AdA1/3T2w0zgoP/sS4aArDSYrF7eAQ== Date: Thu, 22 Jan 2015 04:54:08 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772806A@nkgeml506-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772806Ankgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "mpls@ietf.org" Subject: [spring] New Comments on Segment Routing(3): Challenge of DoD and Inter-area extensions for SR-BE Path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi all authors of segment routing,

 

This is the third comments.

 


            &nb= sp; +-------+   +-------+   +------= +   +------+
            &nb= sp; |       |   |   =     |   |      | &nb= sp; |      |
           +--+ A= GN11 +---+ AGN21 +---+ ABR1 +---+ LSR1 +--> = to AGN
          /   | = ;      |  /|     &nb= sp; |   |      |   | &nbs= p;    |
   +----+/    +-------+\/ +---= ----+   +------+  /+------+
   | AN |         &n= bsp;    /\        &n= bsp;            \/&n= bsp;    |
   +----+\    +-------+  \= 3;-------+   +------+/\ +------+
          \   | = ;      |   |    &nbs= p;  |   |      |  \| &nbs= p;    |
           +--+ A= GN12 +---+ AGN22 +---+ ABR2 +---+ LSR2 +--> = to AGN
            &nb= sp; |       |   |   =     |   |      | &nb= sp; |      |
            &nb= sp; +-------+   +-------+   +------= +   +------+

   static route     ISIS L1  &nb= sp;            = ISIS L2
    LDP DoD         = LDP DU           &nb= sp;     LDP DU
   <-Access-><--Aggregation Domain--><---------Cor= e--------->
  

Seamless MPLS has been proposed as one important architecture for networ= k integration. As show in the
above the figure. In the access network between AN and AGNs, static route a= nd LDP DoD are adopted.
There even more fetures related LDP in the scenarios: LDP proxy egress on A= GN and Inter-area extensions
 of LDP. The challenge of proxy egress for SR has been proposed in the= previous comments. I would like
to discuss the other two issues:
1. LDP DoD: In this scenarios, LDP DoD is adopted to set up LSP on demand w= hich can controlled the number
of LSP. The control can be applied in the ingress node combing with the ser= vice supported(e.g. in the case,
if the configured LDP remote peer for PW service can trigger LDP DoD to sen= d label request in AN). But for
SR, its floods the label mapping in the network. If hope to control the set= up of LSP, the complex policy

must be applied on multiple nodes.
2. RFC5283 proposes the LDP inter-area extensions. That is, when search rou= tes for the received labelp mapping,
longest-match method can also be adopted besides the exact match. Could you= define clearly for SR what method

is adopted for SR-BE path? Could you explain the effects proposed by dif= ferent methods if you had taken into

account the issue?

 

 

 

 

Regards,
Robin

 

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772806Ankgeml506mbxchi_-- From nobody Wed Jan 21 21:07:58 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 152441A9177; Wed, 21 Jan 2015 21:07:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 vCJXJ1S2UzEd; Wed, 21 Jan 2015 21:07:52 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BFE0A1A9172; Wed, 21 Jan 2015 21:07:51 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml405-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BOH43731; Thu, 22 Jan 2015 05:07:50 +0000 (GMT) Received: from NKGEML410-HUB.china.huawei.com (10.98.56.41) by lhreml405-hub.china.huawei.com (10.201.5.242) with Microsoft SMTP Server (TLS) id 14.3.158.1; Thu, 22 Jan 2015 05:07:49 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml410-hub.china.huawei.com ([10.98.56.41]) with mapi id 14.03.0158.001; Thu, 22 Jan 2015 13:07:41 +0800 From: Lizhenbin To: "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(4): Challenge of Route Dependency for SR-BE Path Thread-Index: AdA2AFmCnRYsHpISS4y8T7IvquyS6A== Date: Thu, 22 Jan 2015 05:07:41 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772808A@nkgeml506-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772808Ankgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "mpls@ietf.org" Subject: [spring] New Comments on Segment Routing(4): Challenge of Route Dependency for SR-BE Path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi all authors of segment routing,

 

This is the fourth comments.

 

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

 

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

 

I don't think it should be the Option 1. For exam= ple, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the SR-BE path and the route path.

 

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

 be taken into account? Hope you have had en= ough analysis on this issue.

 

According to the comments on the depend= ency, I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection resulte fr= om multiple sources.

 

 

 

Regards,
Robin

 

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772808Ankgeml506mbxchi_-- From nobody Wed Jan 21 23:46:58 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C12F71AC434; Wed, 21 Jan 2015 23:46:52 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.277 X-Spam-Level: X-Spam-Status: No, score=-1.277 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FM_FORGED_GMAIL=0.622, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=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 D5u-lOGU3C7m; Wed, 21 Jan 2015 23:46:51 -0800 (PST) Received: from mail-ie0-x22f.google.com (mail-ie0-x22f.google.com [IPv6:2607:f8b0:4001:c03::22f]) (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 AB2EF1A037D; Wed, 21 Jan 2015 23:46:50 -0800 (PST) Received: by mail-ie0-f175.google.com with SMTP id ar1so94832iec.6; Wed, 21 Jan 2015 23:46:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=NsbY5QXx0HQvDs1ESJ4vQN1uH//QUEK6cKLcOHSBy6w=; b=B/wYDUt3rNH4HPrcYc00D9G0/3pFyR6HblvN3hwdPu1WH32PkaIcZsbRc+tzs+nnaz 0Gf7+2sXndNb1cEn7d+8u15GD+eyuWRyrM8UB6M5OAq0GmTzbbW80fUW7y+CnjQlHghs /tUCSrpMbdIlojI/6C4dbujMxo7oWIi+okOmyVknrdz0Br5VStQ1XZFBujqJXHabfEo6 AKCqOg7vAEhAfjuiENUVN5DZxdPVmD6GLW/aYu7yn18G7sec+xLZW2Z9Gf1jOl7TI1QI GwQ3jujwYDC3EiIROcmOCzsGiKIVz+5EbofhVzGlTMa/hWgfSj0FHUtvWM6vUjn6aRWW FpFA== MIME-Version: 1.0 X-Received: by 10.50.124.133 with SMTP id mi5mr1571727igb.13.1421912809821; Wed, 21 Jan 2015 23:46:49 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.27.165 with HTTP; Wed, 21 Jan 2015 23:46:49 -0800 (PST) In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772808A@nkgeml506-mbx.china.huawei.com> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772808A@nkgeml506-mbx.china.huawei.com> Date: Thu, 22 Jan 2015 08:46:49 +0100 X-Google-Sender-Auth: 7RQ5BwHO5S054CWRVQu1COQgMMc Message-ID: From: Robert Raszuk To: Lizhenbin Content-Type: multipart/alternative; boundary=001a1135f578ee5d40050d38df4e Archived-At: Cc: "mpls@ietf.org" , "spring@ietf.org" Subject: Re: [spring] New Comments on Segment Routing(4): Challenge of Route Dependency for SR-BE Path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 22 Jan 2015 07:46:53 -0000 --001a1135f578ee5d40050d38df4e Content-Type: text/plain; charset=UTF-8 Hi Robin, I think your question is not applicable to SR architecture. The right SR analogy to LDP would *NOT* be hop by hop LDP like in your example, but targeted (aka directed) LDP session. In those how to get to FEC's address is just regular lookup in the RIB/FIB (global or vrf depends on use case) and it does not matter what protocol src installed the route. Also note that like in most LDP case SR "labels" or "IDs" are global so regardless on which interface packet arrives (within given topology in case of mt) the lookup result will be identical. Rgs, R. On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin wrote: > Hi all authors of segment routing, > > > > This is the fourth comments. > > > > For LDP, when search route for the destination address which is the FEC of > the label mapping, it should search > the FIB in which the routes are selected from the static route, OSPF, > ISIS, BGP, etc based on the preferences. > Now there is one question for SR-BE path, for example, if the SID/Label is > advertised through OSPF, what type > > of routes should the label mapping depend on when setup the SR-BE path? > > > > I think there may be two choices: > 1. Only depend on the OSPF's own route; > 2. Like the LDP, depends on the selected route. > > > > I don't think it should be the Option 1. For example, we configure static > routes for all nodes along the path to > a specific node which can be totally different from the OSPF routes to the > node. If the static route has higher > priority than the OSPF and the SID/label is advertised by OSPF depends on > OSPF routes, there will be the > > inconsistency between the SR-BE path and the route path. > > > > If the option 2 is adopted, it cannot be assumed that the label mapping > and the route are in the same LSDB which > > can be easily synchronized. There are two challenges: > 1. The direct effect for the OSPF is that at the beginning it just > downloads it routes to the RIB for the route > selection. That is, it is the source of the route selection. But now owing > to SR-BE path, it has to depend on > > the result of the route selection. > 2. OSPF SR-BE path may depend on the routes from the static route, ISIS, > BGP, etc. It is claimed that the SR can > remove the IGP-LDP sync. But according to this analysis, are there the > possible risk we have to introduce the > > OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP sync? Or do you just > think they are rare cases which should not > > be taken into account? Hope you have had enough analysis on this issue. > > > > According to the comments on the dependency, I hope you could specify > clearly in the appropriate draft of segment > > routing as to follows questions for SR-BE path which is helpful for > interoperability: > -- depend on the longest match, or exact match, or both. > -- depned on the SR protocol's own routes or the route selection resulte > from multiple sources. > > > > > > > > Regards, > Robin > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > --001a1135f578ee5d40050d38df4e Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Robin,

I think your question is not applicable to SR architecture.=C2=A0<= /div>

The right SR analogy to LDP woul= d *NOT* be hop by hop LDP like in your example, but targeted (aka directed)= LDP session. In those how to get to FEC's address is just regular look= up in the RIB/FIB (global or vrf depends on use case) and it does not matte= r what protocol src installed the route.=C2=A0

Also note that like in most LDP case SR "labels" o= r "IDs" are global so regardless on which interface packet arrive= s (within given topology in case of mt) the lookup result will be identical= .

Rgs,
R.


On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin <lizhenbin@= huawei.com> wrote:

Hi all authors of segment routing,

=C2=A0

This is the fourth comments.

=C2=A0

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

=C2=A0

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

=C2=A0

I don't think it should be the Option 1. For = example, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF=C2=A0and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the=C2=A0SR-BE path and the route path.

=C2=A0

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

=C2=A0be taken into account? Hope you have had en= ough analysis on this issue.

=C2=A0

According to the=C2=A0comments on=C2=A0the depend= ency,=C2=A0I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection result= e from multiple sources.

=C2=A0

=C2=A0

=C2=A0

Regards,
Robin

=C2=A0


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


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Hi Robert,

Please refer to my inline '[Robin]'.

 

Regards,

Robin

 

=B7=A2=BC=FE=C8=CB: rraszuk@gmail.com [rra= szuk@gmail.com] =B4=FA=B1=ED Robert Raszuk [robert@raszuk.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 15:46
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: spring@ietf.org; mpls@ietf.org
=D6=F7=CC=E2: Re: [spring] New Comments on Segment Routing(4): Chall= enge of Route Dependency for SR-BE Path

Hi Robin,

I think your question is not applicable to SR architecture. 

The right SR analogy to LDP would *NOT* be hop by hop LDP like in your exam= ple, but targeted (aka directed) LDP session.
[Robin] I could not understand your point. No matter T-LDP or local LD= P, they should lookup in the RIB/FIB to determine if the label mapping is a= ctive.
In those how to get to FEC's address is just regular lookup in the RIB/FIB = (global or vrf depends on use case) and it does not matter what protocol sr= c installed the route. 
[Robin] As what you described, could I understand you means for the SR base= d on a specific IGP(e.g. OSPF), it should look up in the RIB/FIB to determi= ne if the label binding is up? If so, there will be the two route dependenc= y change issues I proposed for the OSPF. Why do you think they are not applicable to SR?
 
 
Also note that like in most LDP case SR "labels" or "IDs&quo= t; are global so regardless on which interface packet arrives (within given= topology in case of mt) the lookup result will be identical.

Rgs,
R.


On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi all authors of segment routing,

 

This is the fourth comments.

 

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

 

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

 

I don't think it should be the Option 1. For exam= ple, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the SR-BE path and the route path.

 

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

 be taken into account? Hope you have had en= ough analysis on this issue.

 

According to the comments on the depend= ency, I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection resulte fr= om multiple sources.

 

 

 

Regards,
Robin

 


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


--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772818Cnkgeml506mbxchi_-- From nobody Thu Jan 22 03:14:43 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7BF3A1ACAD8; Thu, 22 Jan 2015 03:14:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.977 X-Spam-Level: X-Spam-Status: No, score=-0.977 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FM_FORGED_GMAIL=0.622, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, SPF_PASS=-0.001] autolearn=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 Fn9SvTzYPA_U; Thu, 22 Jan 2015 03:14:37 -0800 (PST) Received: from mail-ie0-x22e.google.com (mail-ie0-x22e.google.com [IPv6:2607:f8b0:4001:c03::22e]) (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 E539F1AC43D; Thu, 22 Jan 2015 03:14:36 -0800 (PST) Received: by mail-ie0-f174.google.com with SMTP id vy18so776910iec.5; Thu, 22 Jan 2015 03:14:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=mzIZCYC6IGz0n+eTb36eQQXmrnHjaJUcyYh7K/kntx8=; b=oJt1wEkAp9HgWW9XSXg/K2pPwS6gqaxT0c7E0U5sWvS8DJ405O/XYhrK+7qjRrWT2x QrJDr5xftGmWo610z19zB28IA9nlBfMk4Oi3PJKFhyopbkqJKCSEFwx4w/V+MaeX0TtZ 5UypFxdz3EWzEyKReGOcMLuQERt/e02WFjKReuQCoLNe1XAZB+fH9RrjNKr3wL+d+GUF AhzeHLqkrKdEf3yCVPTVWpSPiPnzpe3ID3GweOC7FddkxCDgBwSeRP5D/7gTmMK1OQrZ +gYWa36Uo/GoIHQewkrw218uZFbTN9iVK+z3u/rynotxRAReDVPBz678gErOcQ6HbAPt vTbA== MIME-Version: 1.0 X-Received: by 10.42.29.6 with SMTP id p6mr2025000icc.85.1421925276097; Thu, 22 Jan 2015 03:14:36 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.27.165 with HTTP; Thu, 22 Jan 2015 03:14:36 -0800 (PST) In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772818C@nkgeml506-mbx.china.huawei.com> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772808A@nkgeml506-mbx.china.huawei.com> <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772818C@nkgeml506-mbx.china.huawei.com> Date: Thu, 22 Jan 2015 12:14:36 +0100 X-Google-Sender-Auth: 0-KEaswUKEO3u2CbQ2jvFrMEuxM Message-ID: From: Robert Raszuk To: Lizhenbin Content-Type: multipart/alternative; boundary=20cf301d4266faa273050d3bc686 Archived-At: Cc: "mpls@ietf.org" , "spring@ietf.org" Subject: Re: [spring] =?utf-8?b?562U5aSNOiAgTmV3IENvbW1lbnRzIG9uIFNlZ21lbnQg?= =?utf-8?q?Routing=284=29=3A_Challenge_of_Route_Dependency_for_SR-BE_Path?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 22 Jan 2015 11:14:39 -0000 --20cf301d4266faa273050d3bc686 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Robin, Label binding being up or active seems orthogonal to SR. If it is not active/up different transport will be used between SR nodes for example GRE or UDP etc.. What is the issue with that ? Thx, R. On Thu, Jan 22, 2015 at 12:08 PM, Lizhenbin wrote: > Hi Robert, > > Please refer to my inline '[Robin]'. > > > > Regards, > > Robin > > > ------------------------------ > *=E5=8F=91=E4=BB=B6=E4=BA=BA:* rraszuk@gmail.com [rraszuk@gmail.com] =E4= =BB=A3=E8=A1=A8 Robert Raszuk [ > robert@raszuk.net] > *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2015=E5=B9=B41=E6=9C=8822=E6=97= =A5 15:46 > *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Lizhenbin > *=E6=8A=84=E9=80=81:* spring@ietf.org; mpls@ietf.org > *=E4=B8=BB=E9=A2=98:* Re: [spring] New Comments on Segment Routing(4): Ch= allenge of Route > Dependency for SR-BE Path > > Hi Robin, > > I think your question is not applicable to SR architecture. > > The right SR analogy to LDP would *NOT* be hop by hop LDP like in your > example, but targeted (aka directed) LDP session. > [Robin] I could not understand your point. No matter T-LDP or local LDP, > they should lookup in the RIB/FIB to determine if the label mapping is > active. > In those how to get to FEC's address is just regular lookup in the > RIB/FIB (global or vrf depends on use case) and it does not matter what > protocol src installed the route. > [Robin] As what you described, could I understand you means for the SR > based on a specific IGP(e.g. OSPF), it should look up in the RIB/FIB to > determine if the label binding is up? If so, there will be the two route > dependency change issues I proposed for the OSPF. Why do you think they a= re > not applicable to SR? > > > Also note that like in most LDP case SR "labels" or "IDs" are global so > regardless on which interface packet arrives (within given topology in ca= se > of mt) the lookup result will be identical. > > Rgs, > R. > > > On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin wrote: > >> Hi all authors of segment routing, >> >> >> >> This is the fourth comments. >> >> >> >> For LDP, when search route for the destination address which is the FEC >> of the label mapping, it should search >> the FIB in which the routes are selected from the static route, OSPF, >> ISIS, BGP, etc based on the preferences. >> Now there is one question for SR-BE path, for example, if the SID/Label >> is advertised through OSPF, what type >> >> of routes should the label mapping depend on when setup the SR-BE path? >> >> >> >> I think there may be two choices: >> 1. Only depend on the OSPF's own route; >> 2. Like the LDP, depends on the selected route. >> >> >> >> I don't think it should be the Option 1. For example, we configure stati= c >> routes for all nodes along the path to >> a specific node which can be totally different from the OSPF routes to >> the node. If the static route has higher >> priority than the OSPF and the SID/label is advertised by OSPF depends o= n >> OSPF routes, there will be the >> >> inconsistency between the SR-BE path and the route path. >> >> >> >> If the option 2 is adopted, it cannot be assumed that the label mapping >> and the route are in the same LSDB which >> >> can be easily synchronized. There are two challenges: >> 1. The direct effect for the OSPF is that at the beginning it just >> downloads it routes to the RIB for the route >> selection. That is, it is the source of the route selection. But now >> owing to SR-BE path, it has to depend on >> >> the result of the route selection. >> 2. OSPF SR-BE path may depend on the routes from the static route, ISIS, >> BGP, etc. It is claimed that the SR can >> remove the IGP-LDP sync. But according to this analysis, are there the >> possible risk we have to introduce the >> >> OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP sync? Or do you just >> think they are rare cases which should not >> >> be taken into account? Hope you have had enough analysis on this issue. >> >> >> >> According to the comments on the dependency, I hope you could specify >> clearly in the appropriate draft of segment >> >> routing as to follows questions for SR-BE path which is helpful for >> interoperability: >> -- depend on the longest match, or exact match, or both. >> -- depned on the SR protocol's own routes or the route selection resulte >> from multiple sources. >> >> >> >> >> >> >> >> Regards, >> Robin >> >> >> >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring >> >> > --20cf301d4266faa273050d3bc686 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Robin,

Label binding being up or active seems orthogonal to SR. If it is not= active/up different transport will be used between SR nodes for example GR= E or UDP etc.. What is the issue with that ?

<= div class=3D"gmail_default" style=3D"font-family:courier new,monospace;font= -size:small">Thx,
R.

On Thu, Jan 22, 2015 at 12:08 PM, Lizhenb= in <lizhenbin@huawei.com> wrote:

Hi Robert,

Please refer to my inline '[Robin]'.

=C2=A0

Regards,

Robin

=C2=A0

=E5= =8F=91=E4=BB=B6=E4=BA=BA: rraszuk@gmail.com [rraszuk@gmail.com] =E4=BB=A3=E8=A1=A8 Robert Raszuk [robert@raszuk.net]<= br> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2015=E5=B9=B41=E6=9C=8822=E6= =97=A5 15:46
=E6=94=B6=E4=BB=B6=E4=BA=BA: Lizhenbin
=E6=8A=84=E9=80=81: spring@ietf.org; mpls@ietf.org
=E4=B8=BB=E9=A2=98: Re: [spring] New Comments on Segment Routing(4):= Challenge of Route Dependency for SR-BE Path

Hi Robin,

I think your question is not applicable to SR architecture.=C2=A0

The right SR analogy to LDP would *NOT* be hop by hop LDP like in your exam= ple, but targeted (aka directed) LDP session.
[Robin]=C2=A0I could not understand your point. No matter T-LDP or local LD= P, they should lookup in the RIB/FIB to determine if the label mapping is a= ctive.
In those how to get to FEC's address is just regular lookup in the RIB/= FIB (global or vrf depends on use case) and it does not matter what protoco= l src installed the route.=C2=A0
[Robin] As what you described, could I understand you means for the SR base= d on a specific IGP(e.g. OSPF), it should look up in the RIB/FIB to determi= ne if the label binding is up? If so, there will be the two route dependenc= y change issues I proposed for the OSPF. Why do you think they are not applicable to SR?
=C2=A0
=C2=A0
Also note that like in most LDP case SR "labels" or "IDs&quo= t; are global so regardless on which interface packet arrives (within given= topology in case of mt) the lookup result will be identical.

Rgs,
R.


On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi all authors of segment routing,

=C2=A0

This is the fourth comments.

=C2=A0

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

=C2=A0

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

=C2=A0

I don't think it should be the Option 1. For = example, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF=C2=A0and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the=C2=A0SR-BE path and the route path.

=C2=A0

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

=C2=A0be taken into account? Hope you have had en= ough analysis on this issue.

=C2=A0

According to the=C2=A0comments on=C2=A0the depend= ency,=C2=A0I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection result= e from multiple sources.

=C2=A0

=C2=A0

=C2=A0

Regards,
Robin

=C2=A0


_______________________________________________
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Hi Robert,

I give you an example. The topology is as follows and all nodes support = SR.

 

A  ---  B  ---  C  ---- D

 

If SID/label is configured on D and the SID/label binding for the node D= are flooded to A/B/C through OSPF, could you tell me how the SR-BE path to= the node D is set up and the label fowarding entry is created on A, B, C?<= /p>

 

Regards,

Robin

 

 

 

 

=B7=A2=BC=FE=C8=CB: rraszuk@gmail.com [rras= zuk@gmail.com] =B4=FA=B1=ED Robert Raszuk [robert@raszuk.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 19:14
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: spring@ietf.org; mpls@ietf.org
=D6=F7=CC=E2: Re: =B4=F0=B8=B4: [spring] New Comments on Segment Rou= ting(4): Challenge of Route Dependency for SR-BE Path

Robin,

Label binding being up or active seems orthogonal to SR. If it is not activ= e/up different transport will be used between SR nodes for example GRE or U= DP etc.. What is the issue with that ?

Thx,
R.

On Thu, Jan 22, 2015 at 12:08 PM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi Robert,

Please refer to my inline '[Robin]'.

 

Regards,

Robin

 

= =B7=A2=BC=FE=C8=CB: rraszuk@gmail.com [rraszuk@gmail.com] =B4=FA=B1=ED Robert Raszuk [robert@raszuk.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 15:46
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: s= pring@ietf.org; mpls@ietf.org
=D6=F7=CC=E2: Re: [spring] New Comments on Segment Routing(4): Chall= enge of Route Dependency for SR-BE Path

Hi Robin,

I think your question is not applicable to SR architecture. 

The right SR analogy to LDP would *NOT* be hop by hop LDP like in your exam= ple, but targeted (aka directed) LDP session.
[Robin] I could not understand your point. No matter T-LDP or local LD= P, they should lookup in the RIB/FIB to determine if the label mapping is a= ctive.
In those how to get to FEC's address is just regular lookup in the RIB/FIB = (global or vrf depends on use case) and it does not matter what protocol sr= c installed the route. 
[Robin] As what you described, could I understand you means for the SR base= d on a specific IGP(e.g. OSPF), it should look up in the RIB/FIB to determi= ne if the label binding is up? If so, there will be the two route dependenc= y change issues I proposed for the OSPF. Why do you think they are not applicable to SR?
 
 
Also note that like in most LDP case SR "labels" or "IDs&quo= t; are global so regardless on which interface packet arrives (within given= topology in case of mt) the lookup result will be identical.

Rgs,
R.


On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi all authors of segment routing,

 

This is the fourth comments.

 

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

 

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

 

I don't think it should be the Option 1. For exam= ple, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the SR-BE path and the route path.

 

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

 be taken into account? Hope you have had en= ough analysis on this issue.

 

According to the comments on the depend= ency, I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection resulte fr= om multiple sources.

 

 

 

Regards,
Robin

 


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Zw0KDQoNCg== --_000_D0E66F44C1AAaceeciscocom_ Content-Type: text/html; charset="gb2312" Content-ID: Content-Transfer-Encoding: quoted-printable
Hi Robin, 
I don=A1=AFt know about other IGP implementations but the ones I=A1=AF= ve worked on do not resolve routes recursively (unlike LDP or BGP which do)= .  There are cases where OSPF runs over a tunnel but in these cases th= e OSPF interface is either up or down dependent on the tunnel status. Hence, I think the issue you=A1=AFve raised regardin= g protocol synchronization is a moot point. 
Thanks,
Acee 

From: Lizhenbin <lizhenbin@huawei.com>
Date: Thursday, January 22, 2015 at= 6:08 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: "mpls@ietf.org" <mpls@i= etf.org>, "spring@ietf.org" <spring@ietf.org>
Subject: [spring] =B4=F0=B8=B4: New= Comments on Segment Routing(4): Challenge of Route Dependency for SR-BE Pa= th

Hi Robert,

Please refer to my inline '[Robin]'.

 

Regards,

Robin

 

=B7=A2=BC=FE=C8=CB: rraszuk@gmail.com [rraszuk@gmail.com] =B4=FA=B1=ED Robert Raszuk [robert@raszuk.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 15:46
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: spring@ietf.org= ; mpls@ietf.org
=D6=F7=CC=E2: Re: [spring] New Comments on Segment Routing(4): Chall= enge of Route Dependency for SR-BE Path

Hi Robin,

I think your question is not applicable to SR architecture. 

The right SR analogy to LDP would *NOT* be hop by hop LDP like in your exam= ple, but targeted (aka directed) LDP session.
[Robin] I could not understand your point. No matter T-LDP or local LD= P, they should lookup in the RIB/FIB to determine if the label mapping is a= ctive.
In those how to get to FEC's address is just regular lookup in the RIB/FIB = (global or vrf depends on use case) and it does not matter what protocol sr= c installed the route. 
[Robin] As what you described, could I understand you means for the SR base= d on a specific IGP(e.g. OSPF), it should look up in the RIB/FIB to determi= ne if the label binding is up? If so, there will be the two route dependenc= y change issues I proposed for the OSPF. Why do you think they are not applicable to SR?
 
 
Also note that like in most LDP case SR "labels" or "IDs&quo= t; are global so regardless on which interface packet arrives (within given= topology in case of mt) the lookup result will be identical.

Rgs,
R.


On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi all authors of segment routing,

 

This is the fourth comments.

 

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

 

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

 

I don't think it should be the Option 1. For exam= ple, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the SR-BE path and the route path.

 

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

 be taken into account? Hope you have had en= ough analysis on this issue.

 

According to the comments on the depend= ency, I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection resulte fr= om multiple sources.

 

 

 

Regards,
Robin

 


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Hi Acee,

I don't think my proposed issues is the same case as you proposed. I thi= nk your proposed case is like forwarding agency or IGP short-cut using tunn= el as the interface to hide the MPLS from the OSPF.  My case is the SR= -BE path in which OSPF is like LDP as one MPLS control protocol to loop up the route to determine the outgoting = interface and the nexthop for the label mapping advertised by OSPF's self i= nstead of hiding the label in the tunnel.

 

 

Regards,

Robin

 

 

 

 

=B7=A2=BC=FE=C8=CB: Acee Lindem (acee) [ac= ee@cisco.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 22:15
=CA=D5=BC=FE=C8=CB: Lizhenbin; Robert Raszuk
=B3=AD=CB=CD: mpls@ietf.org; spring@ietf.org
=D6=F7=CC=E2: Re: [spring] =B4=F0=B8=B4: New Comments on Segment Rou= ting(4): Challenge of Route Dependency for SR-BE Path

Hi Robin, 
I don=A1=AFt know about other IGP implementations but the ones I=A1=AF= ve worked on do not resolve routes recursively (unlike LDP or BGP which do)= .  There are cases where OSPF runs over a tunnel but in these cases th= e OSPF interface is either up or down dependent on the tunnel status. Hence, I think the issue you=A1=AFve raised regardin= g protocol synchronization is a moot point. 
Thanks,
Acee 

From: Lizhenbin <lizhenbin@huawei.com> Date: Thursday, January 22, 2015 a= t 6:08 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Subject: [spring] =B4=F0=B8=B4: Ne= w Comments on Segment Routing(4): Challenge of Route Dependency for SR-BE P= ath

Hi Robert,

Please refer to my inline '[Robin]'.

 

Regards,

Robin

 

=B7=A2=BC=FE=C8=CB: rraszuk@gmail.com [rraszuk@gmail.com= ] =B4=FA=B1=ED Robert Raszuk [robert@raszuk.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 15:46
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: s= pring@ietf.org; mpls@ietf.org
=D6=F7=CC=E2: Re: [spring] New Comments on Segment Routing(4): Chall= enge of Route Dependency for SR-BE Path

Hi Robin,

I think your question is not applicable to SR architecture. 

The right SR analogy to LDP would *NOT* be hop by hop LDP like in your exam= ple, but targeted (aka directed) LDP session.
[Robin] I could not understand your point. No matter T-LDP or local LD= P, they should lookup in the RIB/FIB to determine if the label mapping is a= ctive.
In those how to get to FEC's address is just regular lookup in the RIB/FIB = (global or vrf depends on use case) and it does not matter what protocol sr= c installed the route. 
[Robin] As what you described, could I understand you means for the SR base= d on a specific IGP(e.g. OSPF), it should look up in the RIB/FIB to determi= ne if the label binding is up? If so, there will be the two route dependenc= y change issues I proposed for the OSPF. Why do you think they are not applicable to SR?
 
 
Also note that like in most LDP case SR "labels" or "IDs&quo= t; are global so regardless on which interface packet arrives (within given= topology in case of mt) the lookup result will be identical.

Rgs,
R.


On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi all authors of segment routing,

 

This is the fourth comments.

 

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

 

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

 

I don't think it should be the Option 1. For exam= ple, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the SR-BE path and the route path.

 

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

 be taken into account? Hope you have had en= ough analysis on this issue.

 

According to the comments on the depend= ency, I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection resulte fr= om multiple sources.

 

 

 

Regards,
Robin

 


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


--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D47729671nkgeml506mbxchi_-- From nobody Mon Jan 26 03:21:29 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 009581A8910; Mon, 26 Jan 2015 03:21:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 DrRGdia_0tT3; Mon, 26 Jan 2015 03:21:23 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA9D31A882F; Mon, 26 Jan 2015 03:21:22 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml404-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BOK89819; Mon, 26 Jan 2015 11:21:21 +0000 (GMT) Received: from nkgeml407-hub.china.huawei.com (10.98.56.38) by lhreml404-hub.china.huawei.com (10.201.5.218) with Microsoft SMTP Server (TLS) id 14.3.158.1; Mon, 26 Jan 2015 11:21:20 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml407-hub.china.huawei.com ([10.98.56.38]) with mapi id 14.03.0158.001; Mon, 26 Jan 2015 19:21:16 +0800 From: Lizhenbin To: "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(5): Challenge of Hot-standby for SR-TE Path Thread-Index: AQHQOVoyK64QSjXka0yfZ8lTIcYadw== Date: Mon, 26 Jan 2015 11:21:15 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772968B@nkgeml506-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772968Bnkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "mpls@ietf.org" , "teas@ietf.org" Subject: [spring] New Comments on Segment Routing(5): Challenge of Hot-standby for SR-TE Path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 26 Jan 2015 11:21:25 -0000 --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772968Bnkgeml506mbxchi_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 SGkgYWxsIGF1dGhvcnMgb2Ygc2VnbWVudCByb3V0aW5nLA0KDQoNCg0KVGhpcyBpcyB0aGUgZmlm dGggY29tbWVudHMgb24gc2VnbWVudCByb3V0aW5nLiBJdCBpcyByZWxhdGVkIHdpdGggU1ItVEUg cGF0aCBhbmQgSSBpbmNsdWRlIHRoZSBURUFTIFdHIGluIHRoZSBkaWN1c3Npb24uDQoNCg0KDQog ICAgICAgICAxICAgICAgICAgICAgICAxICAgICAgICAgICAxICAgICAgICAgICAgMQ0KICBTMTEt LS0tLS0tLS0tLVMxMi0tLS0tLS0tLS1TMTMtLS0tLS0tLS1TMTQtLS0tLS0tLS1TMTUNCiAgIHwg ICAgICAgICAgICAgfCAgICAgICAgICAgIHwgICAgICAgICAgIHwgICAgICAgICAgIHwNCiAgMXwg ICAgICAgICAgICAxfCAgICAgICAgICAgMXwgICAgICAgICAgMXwgICAgICAgICAgMXwNCiAgIHwg ICAgICAgICAgICAgfCAgICAgICAgICAgIHwgICAgICAgICAgIHwgICAgICAgICAgIHwNCiAgUzIx LS0tLS0tLS0tLS1TMjItLS0tLS0tLS0tUzIzLS0tLS0tLS0tUzI0LS0tLS0tLS0tUzI1DQogICAg ICAgICA0ICAgICAgICAgICAgICA0ICAgICAgICAgICA0ICAgICAgICAgICAgNA0KDQpNUExTIFRF IGhvdHN0YW5keSBpcyBhbHdheXMgYWRvcHRlZCBpbiB0aGUgTVBMUyBmb3IgdGhlIHRyYWZmaWMg cHJvdGVjdGlvbi4gSW4gb3JkZXIgdG8gYXZvaWQgb25lIG5vZGUvbGluayBmYWlsdXJlIGNhdXNl DQoNCmJvdGggdGhlIHByaW1hcnkgcGF0aCBhbmQgdGhlIGJhY2t1cCBwYXRoIGJlY29tZXMgZG93 biwgaXQgaXMgcmVxdWlyZWQgdGhhdCB0aGUgcHJpbWFyeSBwYXRoIGFuZCB0aGUgYmFja3VwIHBh dGggc2hvdWxkDQoNCmJlIHRvdGFsbHkgZGlzam9pbnRlZC4NCg0KDQoNCkkgYXNzdW1lIHRoYXQg dGhlIGRlc2lnbiBwcmluaWNpcGxlIHNob3VsZCBiZSBhbHNvIGFwcGxpZWQgdG8gdGhlIFNSLVRF IHBhdGguIElmIHNvLCB0YWtpbmcgaW50byBhY2NvdW50IHRoZSBhYm92ZSB0b3BvbG90eQ0KDQog KHRoZSBudW1iZXJzIG5lYXIgdGhlIGxpbmUgcmVwcmVzZW50IHRoZSBtZXRyaWNzIG9mIHRoZSBs aW5rcyksIGluIG9yZGVyIHRvIGd1YXJhbnRlZSB0aGUgZGlzam9pbnQgb2YgdGhlIHByaW1hcnkg cGF0aA0KDQphbmQgdGhlIGJhY2t1cCBwYXRoLCB0aGUgbGFiZWwgc3RhY2sgWyBTMjIgU0woUzIy L1MyMykgUzIzIFNMKFMyMy8yNCkgUzI0IFNMKFMyNC9TMjUpIFMxNSBdIChTTCBtZWFucyB0aGUg bGluayBzZWdtZW50DQoNCmJldHdlZW4gdGhlIHR3byBuZWlnaGJvcmluZyBub2RlcykgbXVzdCBi ZSBzcGVjaWZpZWQgZm9yIHRoZSBob3RzdGFuZGJ5IHBhdGguIFNvIGluIHRoZSBjYXNlIHRoZXJl IG1heWJlIG1vcmUgbGFiZWxzIHRvIGJlDQoNCmVuY2Fwc3VsYXRlZCBmb3IgdGhlIHBhY2tldHMg Zm9yd2FyZGVkIHRocm91Z2ggdGhlIGhvdC1zdGFuZGJ5IHBhdGguIEl0IG1heSBiZSBlYXN5IHRv IGV4Y2VlZCB0aGUgaGFyZHdhcmUgbGltaXRhdGlvbiBhbmQNCg0KY2F1c2UgdGhlIGxvdyBlZmZp Y2llbmN5IHBheWxvYWQuDQoNCkkgd29uZGVyIGlmIHlvdSB0aGluayBhYm91dCB0aGUgY2hhbGxl bmdlLiBIb3BlIHRvIGdldCB5b3VyIG9waW5pb24gb24gaXQuDQoNCg0KDQoNCg0KUmVnYXJkcywN ClJvYmluDQo= --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772968Bnkgeml506mbxchi_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi all authors of segment routing,

 

This is the fifth comments on segment routing. It= is related with SR-TE path and I include the TEAS WG in the dicussion.

 


         1    &= nbsp;         1   &n= bsp;       1     &nb= sp;      1
  S11-----------S12----------S13---------S14---------S15
   |          &= nbsp;  |          &n= bsp; |           | &= nbsp;         |
  1|           = 1|           1| &nb= sp;        1|    &nb= sp;     1|
   |          &= nbsp;  |          &n= bsp; |           | &= nbsp;         |
  S21-----------S22----------S23---------S24---------S25
         4    &= nbsp;         4   &n= bsp;       4     &nb= sp;      4

MPLS TE hotstandy is always adopted in the MPLS for the traffic protecti= on. In order to avoid one node/link failure cause

both the primary path and the backup path becomes down, it is requi= red that the primary path and the backup path should

be totally disjointed.

 

I assume that the design priniciple should be also applied to the SR-TE = path. If so, taking into account the above topoloty

 (the numbers near the line represent the metrics of the links), in= order to guarantee the disjoint of the primary path

and the backup path, the label stack [ S22 SL(S22/S23) S23 SL(S23/24) S2= 4 SL(S24/S25) S15 ] (SL means the link segment

between the two neighboring nodes) must be specified for the hotstandby = path. So in the case there maybe more labels to be

encapsulated for the packets forwarded through the hot-standby path= . It may be easy to exceed the hardware limitation and

cause the low efficiency payload.

I wonder if you think about the challenge. Hope to get your opinion on i= t.

 

 


Regards,
Robin

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772968Bnkgeml506mbxchi_-- From nobody Mon Jan 26 03:41:15 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5A8681A892C; Mon, 26 Jan 2015 03:41:11 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 D4Pr_D03-m0M; Mon, 26 Jan 2015 03:41:09 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 54D661A882F; Mon, 26 Jan 2015 03:41:08 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml401-hub.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BRT07897; Mon, 26 Jan 2015 11:41:07 +0000 (GMT) Received: from NKGEML410-HUB.china.huawei.com (10.98.56.41) by lhreml401-hub.china.huawei.com (10.201.5.240) with Microsoft SMTP Server (TLS) id 14.3.158.1; Mon, 26 Jan 2015 11:41:06 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml410-hub.china.huawei.com ([10.98.56.41]) with mapi id 14.03.0158.001; Mon, 26 Jan 2015 19:40:58 +0800 From: Lizhenbin To: "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(6): Challenge of Loose Explicit Path for SR-TE Path Thread-Index: AQHQOVry9L8WAh2w3ECX3Jff5mfs3Q== Date: Mon, 26 Jan 2015 11:40:57 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D477296BD@nkgeml506-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477296BDnkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "mpls@ietf.org" , "teas@ietf.org" Subject: [spring] New Comments on Segment Routing(6): Challenge of Loose Explicit Path for SR-TE Path X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi all authors of segment routing,

 

This is the sixth comments on segment routing. It= is another issue related with SR-TE path.


            &nb= sp;    S4---S5
            &nb= sp;   /       \
    S1---S2---S3       &n= bsp; S8---S9---S10
            &nb= sp;   \       /
            &nb= sp;    S6---S7


For MPLS TE, there are two types of explicit paths: strict and loose. Even = for the loose hop, the ingress node will

calculate all the hops to the loose hop. And the MPLS TE path is indepen= dent from the routing, this means even if

the route change, the MPLS TE path to the loose hop can be kept. For exa= mple, as shown in the above figure, if the

ingress S1 configures the loose hop S8 to the destination S10, it will c= alculate the path S1->S2->S3->S4->S5->S8->S9->S10.

If the metric changes for the link between S3 and S4 and make the shorte= st route path to S8 from the S3->S4->S5->S8 to
S3->S6->S7->S8. But the exiting MPLS TE path will not change accor= dingly.

 

For SR-BE Path, if the loose hop is configured, there will be two possib= le choices:
Option 1. Same as the existing MPLS TE.

If the option is adopted, there will be following challenges:
1) This means the loose hop cannot reduce the label stack for the SR-TE pat= h. It need more labels to be encapsulated after

calculating the whole path and representing each hop with node label or = adjacency label. The deep depth of the label statck

 may exceeds the hardware limitation or cause low efficiency payloa= d.
2) More challenges can be proposed from the inter-area bahavior. If PCE is = not adopted, if the ingress node has to only

specify the ABRs as the loose hop to the destination for inter-area, for= MPLS TE, the ingress node can acquire the end-to-end

path info through RRO.  But since there is no RRO-like me= chanism in IGP, it is impossible for SR-TE path to get the end-to-end

path info. This means the ingress node cannot get the whole label stack = info to determine the whole SR-TE path.

 

Option 2. Limited labels for the loose hop. For example, since only loos= e hop S8 is specified, then the label stack for the

SR-TE path to the S10 is [S8 S10]. That is, two layers of labels is enou= gh.

This method can avoid the deep label stack issue. But it will introduce = other issues. In fact, for the SR-TE path, it mixes

the route path and the TE path together. There may be following issues:<= /p>

1) The route change will have effect on the SR-TE path. If the routes to= the S8 is changes, the SR-TE path to the S10 will

change accordingly.
2) For the ingress node, from the point of the network maintenance view, it= loses the control on the end-to-end path. That is,

the end-to-end path is unknown to the ingress node.
3) If there is load balance for the route, for example, there are two equal= paths to S8 as the above topology: S3->S4->S5->S8,

S3->S6->S7->S8.If BFD is enabled for the SR-TE path, the BFD pa= ckets and the real traffic may go through different path.

There will be the possibility that BFD will detect the wrong path and ma= y cause furthe problem such as the wrong traffic switch.

 

I wonder if the issue has been taken into account and which option you p= refer.

 

 

 

 

Regards,

Robin

 

 

 

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D477296BDnkgeml506mbxchi_-- From nobody Mon Jan 26 05:57:22 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A080E1A8AAF; Mon, 26 Jan 2015 05:57:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -8.56 X-Spam-Level: X-Spam-Status: No, score=-8.56 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CHARSET_FARAWAY_HEADER=3.2, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham 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 OxNw6rdIc71w; Mon, 26 Jan 2015 05:57:14 -0800 (PST) Received: from alln-iport-8.cisco.com (alln-iport-8.cisco.com [173.37.142.95]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0C2341A8906; Mon, 26 Jan 2015 05:57:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=23725; q=dns/txt; s=iport; t=1422280634; x=1423490234; h=from:to:cc:subject:date:message-id:mime-version; bh=pOyfZNmM6rx9IYl40l7he6UhxYdZ00yKPlVFkInWUsE=; b=YpCKbmdP2hytrc6R8BvdC95OiAt6EqxAc9mz35zH/p5D5lE1EEx+Z72c 9sO9eZ/NKZ/+eYGAz5vmT79PNLzO00zaut+x+bcf1VJZeqn0/spk1nSMz gJu4Tf3NUrbzfyXsGxzLsoK4i7adeHJigto3xLWctsmPqN/OyRX4kv4OJ s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: A0DkBQAHR8ZU/4MNJK1agkNDUlkEgnzDNgEJhSdKAhx8QwEBAQEBfYQMAQEBBAEBAWsLEgEGAhEBAgECFg4EBQQfBgsUAwMDCgQBDQWIGAMRDaIWnGYIjw4NhQ4BAQEBAQEBAQEBAQEBAQEBAQEBAQETBI1Ogg8KDQQGC4JagUUFjQ2BYYdcgUWBFYJ/iDKCOYM9IoIygTxvgUR+AQEB X-IronPort-AV: E=Sophos;i="5.09,469,1418083200"; d="scan'208,217";a="117571384" Received: from alln-core-1.cisco.com ([173.36.13.131]) by alln-iport-8.cisco.com with ESMTP; 26 Jan 2015 13:57:13 +0000 Received: from xhc-rcd-x07.cisco.com (xhc-rcd-x07.cisco.com [173.37.183.81]) by alln-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id t0QDvD13008622 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 26 Jan 2015 13:57:13 GMT Received: from xmb-aln-x06.cisco.com ([169.254.1.144]) by xhc-rcd-x07.cisco.com ([173.37.183.81]) with mapi id 14.03.0195.001; Mon, 26 Jan 2015 07:57:12 -0600 From: "Acee Lindem (acee)" To: Lizhenbin , Robert Raszuk Thread-Topic: =?gb2312?B?tPC4tDogW3NwcmluZ10gtPC4tDogIE5ldyBDb21tZW50cyBvbiBTZWdtZW50?= =?gb2312?B?IFJvdXRpbmcoNCk6IENoYWxsZW5nZSBvZiBSb3V0ZSBEZXBlbmRlbmN5IGZv?= =?gb2312?Q?r_SR-BE_Path?= Thread-Index: AQHQOW/72sceR5fD3UaIHxskBX26+w== Date: Mon, 26 Jan 2015 13:57:12 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.116.152.196] Content-Type: multipart/alternative; boundary="_000_D0EBB113C426aceeciscocom_" MIME-Version: 1.0 Archived-At: Cc: "mpls@ietf.org" , "spring@ietf.org" Subject: Re: [spring] =?gb2312?b?tPC4tDogILTwuLQ6ICBOZXcgQ29tbWVudHMgb24gU2Vn?= =?gb2312?b?bWVudCBSb3V0aW5nKDQpOiBDaGFsbGVuZ2Ugb2YgUm91dGUgRGVwZW5kZW5j?= =?gb2312?b?eSBmb3IgU1ItQkUgUGF0aA==?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi Robin, 

From: Lizhenbin <lizhenbin@huawei.com>
Date: Monday, January 26, 2015 at 6= :11 AM
To: Acee Lindem <acee@cisco.com>, Robert Raszuk <robert@raszuk.net>
Cc: "mpls@ietf.org" <mpls@i= etf.org>, "spring@ietf.org" <spring@ietf.org>
Subject: =B4=F0=B8=B4: [spring] =B4= =F0=B8=B4: New Comments on Segment Routing(4): Challenge of Route Dependenc= y for SR-BE Path

Hi Acee,

I don't think my proposed issues is the same case as you proposed. I thi= nk your proposed case is like forwarding agency or IGP short-cut using tunn= el as the interface to hide the MPLS from the OSPF.  My case is the SR= -BE path in which OSPF is like LDP as one MPLS control protocol to loop up the route to determine the outgoting = interface and the nexthop for the label mapping advertised by OSPF's self i= nstead of hiding the label in the tunnel.

Right - and my point is that normally OSPF would only consider OSPF ro= utes in this case.  

Thanks,
Acee


 

 

Regards,

Robin

 

 

 

 

=B7=A2=BC=FE=C8=CB: Acee Lindem (acee) [acee@cisco.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 22:15
=CA=D5=BC=FE=C8=CB: Lizhenbin; Robert Raszuk
=B3=AD=CB=CD: mpls@ietf.org; spring@ietf.org
=D6=F7=CC=E2: Re: [spring] =B4=F0=B8=B4: New Comments on Segment Rou= ting(4): Challenge of Route Dependency for SR-BE Path

Hi Robin, 
I don=A1=AFt know about other IGP implementations but the ones I=A1=AF= ve worked on do not resolve routes recursively (unlike LDP or BGP which do)= .  There are cases where OSPF runs over a tunnel but in these cases th= e OSPF interface is either up or down dependent on the tunnel status. Hence, I think the issue you=A1=AFve raised regardin= g protocol synchronization is a moot point. 
Thanks,
Acee 

From: Lizhenbin <lizhenbin@huawei.com> Date: Thursday, January 22, 2015 a= t 6:08 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Subject: [spring] =B4=F0=B8=B4: Ne= w Comments on Segment Routing(4): Challenge of Route Dependency for SR-BE P= ath

Hi Robert,

Please refer to my inline '[Robin]'.

 

Regards,

Robin

 

=B7=A2=BC=FE=C8=CB:rraszuk@gmail.com [rraszuk@gmail.com] =B4=FA=B1=ED Robe= rt Raszuk [robert@rasz= uk.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C222=C8=D5 15:46
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: s= pring@ietf.org; mpls@ietf.org
=D6=F7=CC=E2: Re: [spring] New Comments on Segment Routing(4): Chall= enge of Route Dependency for SR-BE Path

Hi Robin,

I think your question is not applicable to SR architecture. 

The right SR analogy to LDP would *NOT* be hop by hop LDP like in your exam= ple, but targeted (aka directed) LDP session.
[Robin] I could not understand your point. No matter T-LDP or local LD= P, they should lookup in the RIB/FIB to determine if the label mapping is a= ctive.
In those how to get to FEC's address is just regular lookup in the RIB/FIB = (global or vrf depends on use case) and it does not matter what protocol sr= c installed the route. 
[Robin] As what you described, could I understand you means for the SR base= d on a specific IGP(e.g. OSPF), it should look up in the RIB/FIB to determi= ne if the label binding is up? If so, there will be the two route dependenc= y change issues I proposed for the OSPF. Why do you think they are not applicable to SR?
 
 
Also note that like in most LDP case SR "labels" or "IDs&quo= t; are global so regardless on which interface packet arrives (within given= topology in case of mt) the lookup result will be identical.

Rgs,
R.


On Thu, Jan 22, 2015 at 6:07 AM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi all authors of segment routing,

 

This is the fourth comments.

 

For LDP, when search route for the destination ad= dress which is the FEC of the label mapping, it should search
the FIB in which the routes are selected from the static route, OSPF, ISIS,= BGP, etc based on the preferences.
Now there is one question for SR-BE path, for example, if the SID/Label is = advertised through OSPF, what type

of routes should th= e label mapping depend on when setup the SR-BE path?

 

I think there may be two choices:
1. Only depend on the OSPF's own route;
2. Like the LDP, depends on the selected route.

 

I don't think it should be the Option 1. For exam= ple, we configure static routes for all nodes along the path to
a specific node which can be totally different from the OSPF routes to the = node. If the static route has higher
priority than the OSPF and the SID/label is advertised by OSPF depends= on OSPF routes, there will be the

inconsistency between the SR-BE path and the route path.

 

If the option 2 is adopted, it cannot be assumed = that the label mapping and the route are in the same LSDB which

can be easily synchronized. There are two challen= ges:
1. The direct effect for the OSPF is that at the beginning it just download= s it routes to the RIB for the route
selection. That is, it is the source of the route selection. But now owing = to SR-BE path, it has to depend on

the result of the route selection.
2. OSPF SR-BE path may depend on the routes from the static route, ISIS, BG= P, etc. It is claimed that the SR can
remove the IGP-LDP sync. But according to this analysis, are there the poss= ible risk we have to introduce the

OSPF-ISIS sync, OSPF-Static Route sync, OSPF-BGP = sync? Or do you just think they are rare cases which should not

 be taken into account? Hope you have had en= ough analysis on this issue.

 

According to the comments on the depend= ency, I hope you could specify clearly in the appropriate draft of seg= ment

routing as to follows questions for SR-BE path wh= ich is helpful for interoperability:
-- depend on the longest match, or exact match, or both.
-- depned on the SR protocol's own routes or the route selection resulte fr= om multiple sources.

 

 

 

Regards,
Robin

 


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


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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Jan 2015 11:24:36 -0000 --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772A9E9nkgeml506mbxchi_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 SGkgYWxsIGF1dGhvcnMgb2Ygc2VnbWVudCByb3V0aW5nLA0KDQpUaGlzIGlzIHRoZSBzZXZlbnRo IGNvbW1lbnMuIFRoZSBpc3N1ZXMgcHJvcG9zZWQgaGVyZSBhcmUgZm9yIGJvdGggU1ItVEUgcGF0 aCBhbmQgU1ItQkUgcGF0aC4NCg0KDQoNCiAgICAgICAgIDEgICAgICAgICAgICAgIDEgICAgICAg ICAgIDEgICAgICAgICAgICAxDQogIFMxMS0tLS0tLS0tLS0tUzEyLS0tLS0tLS0tLVMxMy0tLS0t LS0tLVMxNC0tLS0tLS0tLVMxNQ0KICAgfCAgICAgICAgICAgICB8ICAgICAgICAgICAgfCAgICAg ICAgICAgfCAgICAgICAgICAgfA0KICAxfCAgICAgICAgICAgIDF8ICAgICAgICAgICAxfCAgICAg ICAgICAxfCAgICAgICAgICAxfA0KICAgfCAgICAgICAgICAgICB8ICAgICAgICAgICAgfCAgICAg ICAgICAgfCAgICAgICAgICAgfA0KICBTMjEtLS0tLS0tLS0tLVMyMi0tLS0tLS0tLS1TMjMtLS0t LS0tLS1TMjQtLS0tLS0tLS1TMjUNCiAgICAgICAgIDQgICAgICAgICAgICAgIDQgICAgICAgICAg IDQgICAgICAgICAgICA0DQoNCg0KDQpTdGlsbCB0YWtlIHRoZSB0b3BvbG9neSBpbiB0aGUgY29t bWVudCA2IGFzIHRoZSBleGFtcGxlLiBObyBtYXR0ZXIgdGhlIGxvb3NlIGV4cGxpY2l0IHBhdGgg b3INCg0KdGhlIHN0cmljdCBleHBsaWNpdCBwYXRoIGZvciB0aGUgbG9vc2UgaG9wLCBhc3N1bWUg dGhlIE1UVSBvZiB0aGUgaW50ZXJmYWNlIGlzIHRoZSBzYW1lLA0KDQpzaW5jZSB0aGUgZGVwdGgg b2YgdGhlIGxhYmVsIHN0YWNrcyBmb3IgdGhlIHByaW1hcnkgcGF0aCBhbmQgdGhlIGJhY2t1cCBw YXRoIGFyZSBkaWZmZXJlbnQuDQoNClRoZXJlIGlzIHRoZSByaXNrIHRoYXQgdGhlIGVmZmV0aXZl IHBheWxvYWQgbWF5IHRyYW5zbWl0IHRocm91Z2ggdGhlIHByaW1hcnkgcGF0aCwgYnV0IG1heSBi ZQ0KDQpmcmFnbWVudGVkIG9yIGRyb3BwZWQgaW4gdGhlIGJhY2t1cCBwYXRoLiBBcyB0aGUgZGlm ZmVyZW5jZSBiZXR3ZWVuIHRoZSBsYWJlbCBzdGFja3Mgb2YgdGhlDQoNCnByaW1hcnkgcGF0aCBh bmQgdGhlIGJhY2t1cCBwYXRoIGluY3JlYXNlLCB0aGUgcmlzayB3aWxsIGluY3JlYXNlLg0KDQoN Cg0KRnJvbSB0aGUgY2FzZSwgd2UgY2FuIGRlZHVjZSB0aGF0IHRoZSByaXNrIG1heSBleGlzdHMg Zm9yIGFueSBzY2VuYXJpb3MgaW4gd2hpY2ggdGhlIHNhbWUgdHJhZmZpYw0KDQogbWF5IHN3aXRj aCBmcm9tIG9uZSBTUiBwYXRoIHRvIHRoZSBvdGhlciBTUiBwYXRoLiBUaGUgU1IgcGF0aCBpbmNs dWRlcyBTUi1URSBwYXRoIHN1Y2ggYXMgTVBMUyBURQ0KDQpob3RzdGFuZGJ5L3Jlb3B0aW1pemF0 aW9uIGFuZCBTUi1CRSBwYXRoIHN1Y2ggYXMgVEktRlJSLg0KDQoNCg0KQmVzaWRlcyBhYm92ZSBp c3N1ZXMsIExEUC9SU1ZQLVRFIGNhbiBzdXBwb3J0IHRoZSBwYXRoIE1UVSB0byB0cmFjayB0aGUg TVRVIGluZm9ybWFpdG9uIGFsb25nIHRoZQ0KDQpMU1AgdGhyb3VnaCBzaWduYWxsaW5nLiBUaGVu IHRoZSByZWFzb25hYmxlIE1UVSBpbmZvIHdpbGwgYmUgYWRvcHRlZCBpbiB0aGUgaW5ncmVzcyBu b2RlLiBGb3IgYm90aA0KDQogU1ItVEUgcGF0aCAoaWYgUENFIGlzIG5vdCB1c2VkKSBhbmQgU1It QkUgcGF0aCwgc2luY2UgdGhlcmUgaXMgbm8gc2lnbmFsbGluZyB0byBhZHZlcnRpc2UNCg0KdGhl IGluZm9ybWF0aW9uLiBIb3cgdG8gaW1wbGVtZW50IHRoZSBmZWF0dXJlPyBPciB0aGVyZSBtYXli ZSB0aGUgcmlzayB0aGF0IHRoZSBwYWNrZXQgbWF5IGJlDQoNCmRyb3BwZWQgYnkgdGhlIG5vZGVz IGFsb25nIHRoZSBMU1AuDQoNCg0KDQoNCg0KDQoNClJlZ2FyZHMsDQoNClJvYmluDQo= --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772A9E9nkgeml506mbxchi_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi all authors of segment routing,


This is the seventh commens. The issues proposed here are for both SR-TE pa= th and SR-BE path.

 


         1    &= nbsp;         1   &n= bsp;       1     &nb= sp;      1
  S11-----------S12----------S13---------S14---------S15
   |          &= nbsp;  |          &n= bsp; |           | &= nbsp;         |
  1|           = 1|           1| &nb= sp;        1|    &nb= sp;     1|
   |          &= nbsp;  |          &n= bsp; |           | &= nbsp;         |
  S21-----------S22----------S23---------S24---------S25
         4    &= nbsp;         4   &n= bsp;       4     &nb= sp;      4

 

Still take the topology in the comment 6 as the example. No matter the l= oose explicit path or

the strict explicit path for the loose hop, assume the MTU of the interf= ace is the same,

since the depth of the label stacks for the primary path and the backup = path are different.

There is the risk that the effetive payload may transmit through the pri= mary path, but may be

fragmented or dropped in the backup path. As the difference between the = label stacks of the

primary path and the backup path increase, the risk will increase.

 

From the case, we can deduce that the risk may exists for any scenarios = in which the same traffic

 may switch from one SR path to the other SR path. The SR path incl= udes SR-TE path such as MPLS TE

hotstandby/reoptimization and SR-BE path such as TI-FRR.

 

Besides above issues, LDP/RSVP-TE can support the path MTU to track the = MTU informaiton along the

LSP through signalling. Then the reasonable MTU info will be adopted in = the ingress node. For both

 SR-TE path (if PCE is not used) and SR-BE path, since there is no = signalling to advertise

the information. How to implement the feature? Or there maybe the risk t= hat the packet may be

dropped by the nodes along the LSP.

 

 

 

Regards,

Robin

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772A9E9nkgeml506mbxchi_-- From nobody Tue Jan 27 12:01:55 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BFB2D1A6FF0; Tue, 27 Jan 2015 12:01:48 -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, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham 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 1aVm6-wcOVsD; Tue, 27 Jan 2015 12:01:45 -0800 (PST) Received: from na01-bn1-obe.outbound.protection.outlook.com (mail-bn1bon0770.outbound.protection.outlook.com [IPv6:2a01:111:f400:fc10::1:770]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CF8BD1A8A46; Tue, 27 Jan 2015 12:01:39 -0800 (PST) Received: from hannes-mba.local (193.110.55.11) by DM2PR05MB447.namprd05.prod.outlook.com (10.141.104.150) with Microsoft SMTP Server (TLS) id 15.1.59.20; Tue, 27 Jan 2015 20:01:16 +0000 Received: from hannes-mba.local (localhost [IPv6:::1]) by hannes-mba.local (Postfix) with ESMTP id 50A73D6E580; Tue, 27 Jan 2015 21:01:01 +0100 (CET) Date: Tue, 27 Jan 2015 21:01:01 +0100 From: Hannes Gredler To: Lizhenbin Message-ID: <20150127200101.GA21477@hannes-mba.local> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772A9E9@nkgeml506-mbx.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772A9E9@nkgeml506-mbx.china.huawei.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-Originating-IP: [193.110.55.11] X-ClientProxiedBy: DB4PR06CA0018.eurprd06.prod.outlook.com (25.160.40.146) To DM2PR05MB447.namprd05.prod.outlook.com (10.141.104.150) Authentication-Results: huawei.com; dkim=none (message not signed) header.d=none;huawei.com; dmarc=none action=none header.from=juniper.net; X-DmarcAction-Test: None X-Microsoft-Antispam: UriScan:; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(3005004);SRVR:DM2PR05MB447; X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0; PCL:0; RULEID:(601004); SRVR:DM2PR05MB447; X-Forefront-PRVS: 046985391D X-Forefront-Antispam-Report: SFV:NSPM; SFS:(10019020)(979002)(6009001)(37854004)(24454002)(53754006)(83506001)(46102003)(77096005)(98436002)(92566002)(62966003)(76176999)(54356999)(122386002)(2950100001)(47776003)(19580395003)(33656002)(77156002)(97736003)(76506005)(122856001)(15975445007)(23726002)(40100003)(86362001)(46406003)(110136001)(87976001)(19580405001)(50466002)(50986999)(68736005)(97756001)(66066001)(969003)(989001)(999001)(1009001)(1019001); DIR:OUT; SFP:1102; SCL:1; SRVR:DM2PR05MB447; H:hannes-mba.local; FPR:; SPF:None; MLV:ovrnspm; PTR:InfoNoRecords; LANG:en; X-Exchange-Antispam-Report-CFA-Test: BCL:0;PCL:0;RULEID:;SRVR:DM2PR05MB447; X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2015 20:01:16.6798 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM2PR05MB447 Archived-At: Cc: "mpls@ietf.org" , "spring@ietf.org" , "teas@ietf.org" Subject: Re: [spring] New Comments on Segment Routing(7): MTU Challenges for SR X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 27 Jan 2015 20:01:49 -0000 only can speak for IS-IS - afaik the Trill extensions gave us a way of signaling the MTU of a link ... so what we could do is to advertise the MTU for each adjacency and implement proper fragmentation at the TE tunnel ingress. /hannes On Tue, Jan 27, 2015 at 11:24:23AM +0000, Lizhenbin wrote: | Hi all authors of segment routing, | | This is the seventh commens. The issues proposed here are for both SR-TE | path and SR-BE path. | | | | 1 1 1 1 | S11-----------S12----------S13---------S14---------S15 | | | | | | | 1| 1| 1| 1| 1| | | | | | | | S21-----------S22----------S23---------S24---------S25 | 4 4 4 4 | | | | Still take the topology in the comment 6 as the example. No matter the | loose explicit path or | | the strict explicit path for the loose hop, assume the MTU of the | interface is the same, | | since the depth of the label stacks for the primary path and the backup | path are different. | | There is the risk that the effetive payload may transmit through the | primary path, but may be | | fragmented or dropped in the backup path. As the difference between the | label stacks of the | | primary path and the backup path increase, the risk will increase. | | | | From the case, we can deduce that the risk may exists for any scenarios in | which the same traffic | | may switch from one SR path to the other SR path. The SR path includes | SR-TE path such as MPLS TE | | hotstandby/reoptimization and SR-BE path such as TI-FRR. | | | | Besides above issues, LDP/RSVP-TE can support the path MTU to track the | MTU informaiton along the | | LSP through signalling. Then the reasonable MTU info will be adopted in | the ingress node. For both | | SR-TE path (if PCE is not used) and SR-BE path, since there is no | signalling to advertise | | the information. How to implement the feature? Or there maybe the risk | that the packet may be | | dropped by the nodes along the LSP. | | | | | | | | Regards, | | Robin | _______________________________________________ | spring mailing list | spring@ietf.org | https://www.ietf.org/mailman/listinfo/spring From nobody Wed Jan 28 03:06:21 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 365801A1A31; Wed, 28 Jan 2015 03:06:14 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.74 X-Spam-Level: * X-Spam-Status: No, score=1.74 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CHARSET_FARAWAY_HEADER=3.2, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 ZfbriHGV6ouX; Wed, 28 Jan 2015 03:06:11 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5119D1A1A2D; Wed, 28 Jan 2015 03:06:10 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml406-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BON01810; Wed, 28 Jan 2015 11:06:08 +0000 (GMT) Received: from NKGEML404-HUB.china.huawei.com (10.98.56.35) by lhreml406-hub.china.huawei.com (10.201.5.243) with Microsoft SMTP Server (TLS) id 14.3.158.1; Wed, 28 Jan 2015 11:06:07 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml404-hub.china.huawei.com ([10.98.56.35]) with mapi id 14.03.0158.001; Wed, 28 Jan 2015 19:06:02 +0800 From: Lizhenbin To: Hannes Gredler Thread-Topic: [spring] New Comments on Segment Routing(7): MTU Challenges for SR Thread-Index: AdA6Iy10hnzSmHMYSNeVsID5YDgzbAABb2SAADAnQIE= Date: Wed, 28 Jan 2015 11:06:01 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B845@nkgeml506-mbx.china.huawei.com> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772A9E9@nkgeml506-mbx.china.huawei.com>, <20150127200101.GA21477@hannes-mba.local> In-Reply-To: <20150127200101.GA21477@hannes-mba.local> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B845nkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "mpls@ietf.org" , "spring@ietf.org" , "teas@ietf.org" Subject: [spring] =?gb2312?b?tPC4tDogIE5ldyBDb21tZW50cyBvbiBTZWdtZW50IFJv?= =?gb2312?b?dXRpbmcoNyk6IE1UVSBDaGFsbGVuZ2VzIGZvciBTUg==?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi Hannes,

I have ever thought about the possible solutions = based on the flooded MTU information through IGP.

There are still two possible issues:

1. Inter-area for SR-TE path: Maybe we not only i= ntroduce the IGP extensions, but also PCEP extensions.

2. For SR-BE path, it has to introduce the TE-lik= e end-to-end path calculation at the ingress node.

 

My concern is not just for the possible solutions= , but to explore the essence of SR which may has much

effect on its deployment comparing wit= h the existing MPLS protocol. It will be explained in

the next comments.

 

 

Regards,

Robin

 

 

 



________________________________________
=B7=A2=BC=FE=C8=CB: Hannes Gredler [hannes@juniper.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C228=C8=D5 4:01
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: spring@ietf.org; mpls@ietf.org; teas@ietf.org
=D6=F7=CC=E2: Re: [spring] New Comments on Segment Routing(7): MTU Challeng= es for SR

only can speak for IS-IS -
afaik the Trill extensions gave us a way of signaling the MTU of a link ...=

so what we could do is to advertise the MTU for each adjacency and implemen= t
proper fragmentation at the TE tunnel ingress.

/hannes

On Tue, Jan 27, 2015 at 11:24:23AM +0000, Lizhenbin wrote:
|    Hi all authors of segment routing,
|
|    This is the seventh commens. The issues proposed here a= re for both SR-TE
|    path and SR-BE path.
|
|
|
|             1=             &nb= sp; 1           1 &n= bsp;          1
|      S11-----------S12----------S13---------S14-= --------S15
|       |      =        |      &= nbsp;     |       &n= bsp;   |         &nb= sp; |
|      1|       = ;     1|        = ;   1|          1|&n= bsp;         1|
|       |      =        |      &= nbsp;     |       &n= bsp;   |         &nb= sp; |
|      S21-----------S22----------S23---------S24-= --------S25
|             4=             &nb= sp; 4           4 &n= bsp;          4
|
|
|
|    Still take the topology in the comment 6 as the example= . No matter the
|    loose explicit path or
|
|    the strict explicit path for the loose hop, assume the = MTU of the
|    interface is the same,
|
|    since the depth of the label stacks for the primary pat= h and the backup
|    path are different.
|
|    There is the risk that the effetive payload may transmi= t through the
|    primary path, but may be
|
|    fragmented or dropped in the backup path. As the differ= ence between the
|    label stacks of the
|
|    primary path and the backup path increase, the risk wil= l increase.
|
|
|
|    From the case, we can deduce that the risk may exists f= or any scenarios in
|    which the same traffic
|
|     may switch from one SR path to the other SR path.= The SR path includes
|    SR-TE path such as MPLS TE
|
|    hotstandby/reoptimization and SR-BE path such as TI-FRR= .
|
|
|
|    Besides above issues, LDP/RSVP-TE can support the path = MTU to track the
|    MTU informaiton along the
|
|    LSP through signalling. Then the reasonable MTU info wi= ll be adopted in
|    the ingress node. For both
|
|     SR-TE path (if PCE is not used) and SR-BE path, s= ince there is no
|    signalling to advertise
|
|    the information. How to implement the feature? Or there= maybe the risk
|    that the packet may be
|
|    dropped by the nodes along the LSP.
|
|
|
|
|
|
|
|    Regards,
|
|    Robin

| _______________________________________________
| spring mailing list
| spring@ietf.org
| https://www.ietf.org/mailman/listinfo/spring

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B845nkgeml506mbxchi_-- From nobody Wed Jan 28 03:31:19 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C3D91A1AC8; Wed, 28 Jan 2015 03:31:18 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham 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 nuF5q09_p7rZ; Wed, 28 Jan 2015 03:31:16 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E9C4B1A1A97; Wed, 28 Jan 2015 03:30:46 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml403-hub.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BRV25484; Wed, 28 Jan 2015 11:30:45 +0000 (GMT) Received: from NKGEML404-HUB.china.huawei.com (10.98.56.35) by lhreml403-hub.china.huawei.com (10.201.5.217) with Microsoft SMTP Server (TLS) id 14.3.158.1; Wed, 28 Jan 2015 11:30:44 +0000 Received: from NKGEML506-MBX.china.huawei.com ([169.254.3.150]) by nkgeml404-hub.china.huawei.com ([10.98.56.35]) with mapi id 14.03.0158.001; Wed, 28 Jan 2015 19:30:36 +0800 From: Lizhenbin To: "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(8): Loop Prevention and Error Handling for SR Thread-Index: AdA66yE5259u7U/sTZCfhnmR4h4dmw== Date: Wed, 28 Jan 2015 11:30:35 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B863@nkgeml506-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.217.156.245] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B863nkgeml506mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "mpls@ietf.org" , "teas@ietf.org" Subject: [spring] New Comments on Segment Routing(8): Loop Prevention and Error Handling for SR X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Hi all authors of segment routing,

 

This is the eighth comments. The issues proposed = here apply to both SR-TE path and SR-BE path.

 

For LDP and RSVP-TE, there is the loop prevention= mechanism when setup LSP. For the SR, the SR path is always

setup at the ingress node. It is difficult to det= ect the possible loop in the network. For example, if the

microloop of route happens, the loop prevention m= echanism will prevent LDP to setup LSP. But for the segment

routing, once the ingress node downloads the forw= arding entry and the traffic will experience the microloop.

How can SR to cope with the issue or just leave i= t as the traditional routing?

 

For LDP and RSVP-TE, there is the error notificat= ion mechanism based on the LDP notification message or the

RSVP-TE PathErr/Resv messages. Based on the error= notification, the nodes along the LSP can take possible

actions against the possible errors. But for SR, = there is no such information communicated among the nodes

along the SR Path. The result will be that once t= he packet is forwarded by the ingress node, they may

experience the possible errors which may be preve= nted by the negotiation in the control plane.

 

From the previous comments, we can see that in th= e traditional LSP, the LSP setup is negotiated through

the signalling between the upstream node and the = downstream node. During the negotiation, it is not only to

set up the forwarding the entry for the purpose o= f reachablity, but also includes many aspects (I call them

as the operation and maintenence of the LSP. Hope= it is appropriate. ) such as the end-to-end connectivity

verification, the loop prevention, path MTU, nego= tiation, path recording, error notification and handling,

etc. Though SR always proposes its advantage, in = my opinion, these advantages are from the reachability

part such as the advantage that the label statck = in the ingress node reduces the states in the network. 

But the requirements of the operational and maint= enance for the traditional LSP still exist. Taking into

account that the flooding mode of the IGP, it sto= ps the communication between the nodes along the path,

the work may become more complex. According to th= e past experience, the possible ways I could think out are

as follows:
1) Depend on the third-party mechanisms. But the problem is that there may = involve more mechanisms and there

may be no mechanisms. For example, LSP Ping can b= e adopted to check the end-to-end connectivity or loop for

the SR-BE path, but it cannot be used for path MT= U negotiation. For the end-to-end path recording, LSP Tracert

may have to be introduced. If these requirements = and mechanisms are considered, it means SR does not reduce

the compexity. Instead it just transfers mor= e complexity to the other possible signallings.
2) Depend on one nodes to implement the possible functions. For example, fo= r SR-TE path, it can depend on the

PCE or the ingress node to collect all path info = proposed by path recording or even path MTU negotiation. Even so,

there is still some drawbacks for some scenarios = if only depend on the ingress node. Moreover these methods
cannot apply to SR-BE path.If the possible wo= rk is done through the ingress node, it will begin to change the

essence of SR-BE and become the SR-TE.
3) Leave as it is. That is, these issues are not solved for SR path. In my = own opinion, 20 years ago, only

solving the reachability issues may be accepted. = But today, as the concept of carrier-grade IP network has been

widely accepted and= these features mentioned has been deployed in the traditional MPLS network= , I don't think

they can be removed easily.

In one word, though some advantage driven from th= e reachbility of SR is apparent, the complexity introcuded by

the synthesized requirements are not reduced. And= it may become more complex for SR.

 

 

 

 

Regards,

Robin

 

 

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B863nkgeml506mbxchi_-- From nobody Wed Jan 28 04:54:55 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1AFF51A701A; Wed, 28 Jan 2015 04:54:51 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.277 X-Spam-Level: X-Spam-Status: No, score=-1.277 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FM_FORGED_GMAIL=0.622, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=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 J6LmEm6n8dWC; Wed, 28 Jan 2015 04:54:48 -0800 (PST) Received: from mail-ig0-x22d.google.com (mail-ig0-x22d.google.com [IPv6:2607:f8b0:4001:c05::22d]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 681AB1A6FF9; Wed, 28 Jan 2015 04:54:48 -0800 (PST) Received: by mail-ig0-f173.google.com with SMTP id a13so10368677igq.0; Wed, 28 Jan 2015 04:54:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=U55L7z0pNx58nuVTIOPGTNJ4PM6zqFwvj0e5KmNzzBU=; b=cj+vynFAn4TL6ba/lACfDWSvFQEEFW3K80omEQM9wliX0fMK22VYTOY22YpIbzx2gX qYOPGQiaNCbDUeXRJ1RM+oP0xYbT1sdxn7MWHKm8jQi6vj0ssIXZcSHlp044GV6PKjUR KDyrboQZvt48xOW+5DI5TtXNlKmfhgZ7iXp7ynDG+DfZ2wTyWkIgjBHQkb5pBE8wmyJQ WE5taAG6oLWXz/fiaZT4cW5M7z9ncvLyEYKqm6IM9EC8tbnGJkFByauZSqLzFOXOpkAE mnxzdMa9kTrY2e5db0YAECJ8moASPH3fWscVipnXhVU36MXQacXReRbQOThYqz1X/Wt3 MGgg== MIME-Version: 1.0 X-Received: by 10.50.142.38 with SMTP id rt6mr3319775igb.17.1422449687546; Wed, 28 Jan 2015 04:54:47 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.107.157.69 with HTTP; Wed, 28 Jan 2015 04:54:47 -0800 (PST) In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B863@nkgeml506-mbx.china.huawei.com> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B863@nkgeml506-mbx.china.huawei.com> Date: Wed, 28 Jan 2015 13:54:47 +0100 X-Google-Sender-Auth: AGdXyhykkaTUsvqxr_YVEBjhuG4 Message-ID: From: Robert Raszuk To: Lizhenbin Content-Type: multipart/alternative; boundary=001a11c3a9505650a1050db5e059 Archived-At: Cc: "mpls@ietf.org" , "spring@ietf.org" , "teas@ietf.org" Subject: Re: [spring] New Comments on Segment Routing(8): Loop Prevention and Error Handling for SR X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 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, 28 Jan 2015 12:54:51 -0000 --001a11c3a9505650a1050db5e059 Content-Type: text/plain; charset=UTF-8 Robin, Most if not of your observations circle around idea to use segment routing as MPLS label signalling mechanism. I do not think this is that interesting scenario. Personally I would not deploy it for such purpose of hop by hop MPLS switching. We have LDP for that. Contrary I would use SR for controlled packet steering where responsibility is take to make the right header (be it label or extension headers) upon operator or his controller. To the point of the loop .. note that you may have valid cases to traverse given appliance (SFC use case) more then onces hence I would claim it is not aa architecture spec problem, but if so deployment bug. Best, r. On Wed, Jan 28, 2015 at 12:30 PM, Lizhenbin wrote: > Hi all authors of segment routing, > > > > This is the eighth comments. The issues proposed here apply to both SR-TE > path and SR-BE path. > > > > For LDP and RSVP-TE, there is the loop prevention mechanism when setup > LSP. For the SR, the SR path is always > > setup at the ingress node. It is difficult to detect the possible loop in > the network. For example, if the > > microloop of route happens, the loop prevention mechanism will prevent LDP > to setup LSP. But for the segment > > routing, once the ingress node downloads the forwarding entry and the > traffic will experience the microloop. > > How can SR to cope with the issue or just leave it as the traditional > routing? > > > > For LDP and RSVP-TE, there is the error notification mechanism based on > the LDP notification message or the > > RSVP-TE PathErr/Resv messages. Based on the error notification, the nodes > along the LSP can take possible > > actions against the possible errors. But for SR, there is no such > information communicated among the nodes > > along the SR Path. The result will be that once the packet is forwarded by > the ingress node, they may > > experience the possible errors which may be prevented by the negotiation > in the control plane. > > > > From the previous comments, we can see that in the traditional LSP, the > LSP setup is negotiated through > > the signalling between the upstream node and the downstream node. During > the negotiation, it is not only to > > set up the forwarding the entry for the purpose of reachablity, but also > includes many aspects (I call them > > as the operation and maintenence of the LSP. Hope it is appropriate. ) > such as the end-to-end connectivity > > verification, the loop prevention, path MTU, negotiation, path recording, > error notification and handling, > > etc. Though SR always proposes its advantage, in my opinion, these > advantages are from the reachability > > part such as the advantage that the label statck in the ingress node > reduces the states in the network. > > But the requirements of the operational and maintenance for the > traditional LSP still exist. Taking into > > account that the flooding mode of the IGP, it stops the communication > between the nodes along the path, > > the work may become more complex. According to the past experience, the > possible ways I could think out are > > as follows: > 1) Depend on the third-party mechanisms. But the problem is that there may > involve more mechanisms and there > > may be no mechanisms. For example, LSP Ping can be adopted to check the > end-to-end connectivity or loop for > > the SR-BE path, but it cannot be used for path MTU negotiation. For the > end-to-end path recording, LSP Tracert > > may have to be introduced. If these requirements and mechanisms are > considered, it means SR does not reduce > > the compexity. Instead it just transfers more complexity to the other > possible signallings. > 2) Depend on one nodes to implement the possible functions. For example, > for SR-TE path, it can depend on the > > PCE or the ingress node to collect all path info proposed by path > recording or even path MTU negotiation. Even so, > > there is still some drawbacks for some scenarios if only depend on the > ingress node. Moreover these methods > cannot apply to SR-BE path.If the possible work is done through the > ingress node, it will begin to change the > > essence of SR-BE and become the SR-TE. > 3) Leave as it is. That is, these issues are not solved for SR path. In my > own opinion, 20 years ago, only > > solving the reachability issues may be accepted. But today, as the concept > of carrier-grade IP network has been > > widely accepted and these features mentioned has been deployed in the > traditional MPLS network, I don't think > > they can be removed easily. > > In one word, though some advantage driven from the reachbility of SR is > apparent, the complexity introcuded by > > the synthesized requirements are not reduced. And it may become more > complex for SR. > > > > > > > > > > Regards, > > Robin > > > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > --001a11c3a9505650a1050db5e059 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Robin,

Most if not of your observations circle around idea to use segment ro= uting as MPLS label signalling mechanism. I do not think this is that inter= esting scenario. Personally I would not deploy it for such purpose of hop b= y hop MPLS switching. We have LDP for that.

Contrary I would use SR for controlled packet steering where re= sponsibility is take to make the right header (be it label or extension hea= ders) upon operator or his controller.=C2=A0

<= div class=3D"gmail_default" style=3D"font-family:courier new,monospace;font= -size:small">To the point of the loop .. note that you may have valid cases= to traverse given appliance (SFC use case) more then onces hence I would c= laim it is not aa architecture spec problem, but if so deployment bug.

Best,
r.

=C2=A0

On Wed, Jan 28, 2015 at 12:30 PM, Lizhe= nbin <lizhenbin@huawei.com> wrote:

Hi all authors of segment routing,

=C2=A0

This is the eighth comments. The issues proposed = here apply to both SR-TE path and SR-BE path.

=C2=A0

For LDP and RSVP-TE, there is the loop prevention= mechanism when setup LSP. For the SR, the SR path is always

setup at the ingress node. It is difficult to det= ect the possible loop in the network. For example, if the

microloop of route happens, the loop prevention m= echanism will prevent LDP to setup LSP. But for the segment

routing, once the ingress node downloads the forw= arding entry and the traffic will experience the microloop.

How can SR to cope with the issue or just leave i= t as the traditional routing?

=C2=A0

For LDP and RSVP-TE, there is the error notificat= ion mechanism based on the LDP notification message or the

RSVP-TE PathErr/Resv messages. Based on the error= notification, the nodes along the LSP can take possible

actions against the possible errors. But for SR, = there is no such information communicated among=C2=A0the nodes

along the SR Path. The result will be that once t= he packet is forwarded by the ingress node, they may

experience the possible errors which may be preve= nted by the negotiation in the control plane.

=C2=A0

From the previous comments, we can see that in th= e traditional LSP, the LSP setup is negotiated through

the signalling between the upstream node and the = downstream node. During the negotiation, it is not only to

set up the forwarding the entry for the purpose o= f reachablity, but also includes many aspects (I call them

as the operation and maintenence of the LSP. Hope= it is appropriate. ) such as the end-to-end connectivity

verification, the loop prevention, path MTU, nego= tiation, path recording, error notification and handling,

etc. Though SR always proposes its advantage, in = my opinion, these advantages=C2=A0are=C2=A0from the reachability

part such as the advantage that the label statck = in the ingress node reduces the states in the network.=C2=A0

But the requirements of the operational and maint= enance for the traditional LSP still exist. Taking into

account that the flooding mode of the IGP, it sto= ps the communication between the nodes along the path,

the work may become more complex. According to th= e past experience, the possible ways I could think out=C2=A0are

as follows:
1) Depend on the third-party mechanisms. But the problem is that there may = involve more mechanisms and there

may be no mechanisms. For example, LSP Ping can b= e adopted to check the end-to-end connectivity or loop for

the SR-BE path, but it cannot be used for path MT= U negotiation. For the end-to-end path recording, LSP Tracert

may have to be introduced. If these requirements = and mechanisms are considered,=C2=A0it means SR does not reduce

the compexity. Instead=C2=A0it just transfers mor= e complexity to the other possible signallings.
2) Depend on one nodes to implement the possible functions. For example, fo= r SR-TE path, it can depend on the

PCE or the ingress node to collect all path info = proposed by path recording or even path MTU negotiation. Even so,

there is still some drawbacks for some scenarios = if only depend on the ingress node. Moreover these methods
cannot apply to SR-BE path.If the possible wo= rk is done through the ingress node, it will begin to change the

essence of SR-BE and become the SR-TE.
3) Leave as it is. That is, these issues are not solved for SR path. In my = own opinion, 20 years ago, only

solving the reachability issues may be accepted. = But today, as the concept of carrier-grade IP network has been

widely accepted and= these features mentioned has been deployed in the traditional MPLS network= , I don't think

they can be removed easily.

In one word, though some advantage driven from th= e reachbility of SR is apparent, the complexity introcuded by

the synthesized requirements are not reduced. And= it may become more complex for SR.

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Regards,

Robin

=C2=A0

=C2=A0


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


--001a11c3a9505650a1050db5e059-- From nobody Wed Jan 28 15:27:10 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 66B1A1A6F0B; Wed, 28 Jan 2015 15:27:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -104.2 X-Spam-Level: X-Spam-Status: No, score=-104.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, USER_IN_WHITELIST=-100] autolearn=ham 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 MR_RyiFBj8l8; Wed, 28 Jan 2015 15:27:02 -0800 (PST) Received: from usevmg21.ericsson.net (usevmg21.ericsson.net [198.24.6.65]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 43A6A1A6F05; Wed, 28 Jan 2015 15:27:02 -0800 (PST) X-AuditID: c6180641-f79916d00000623a-3b-54c9112ce250 Received: from EUSAAHC004.ericsson.se (Unknown_Domain [147.117.188.84]) by usevmg21.ericsson.net (Symantec Mail Security) with SMTP id 21.AB.25146.C2119C45; Wed, 28 Jan 2015 17:41:17 +0100 (CET) Received: from EUSAAMB103.ericsson.se ([147.117.188.120]) by EUSAAHC004.ericsson.se ([147.117.188.84]) with mapi id 14.03.0195.001; Wed, 28 Jan 2015 18:27:00 -0500 From: Gregory Mirsky To: Lizhenbin , Hannes Gredler Thread-Topic: [spring] New Comments on Segment Routing(7): MTU Challenges for SR Thread-Index: AQHQOupzE7zeG6qIGUSmi4k6SnvYQZzWLOLQ Date: Wed, 28 Jan 2015 23:26:58 +0000 Message-ID: <7347100B5761DC41A166AC17F22DF1121B8E9553@eusaamb103.ericsson.se> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772A9E9@nkgeml506-mbx.china.huawei.com>, <20150127200101.GA21477@hannes-mba.local> <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B845@nkgeml506-mbx.china.huawei.com> In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D4772B845@nkgeml506-mbx.china.huawei.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.117.188.9] Content-Type: multipart/alternative; boundary="_000_7347100B5761DC41A166AC17F22DF1121B8E9553eusaamb103erics_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuphkeLIzCtJLcpLzFFi42KZXLonRFdX8GSIQUsXu0X/vSdsFrsb/7Bb 3Fq6ktXi+IXfjBatP3awOLB6tBx5y+qxZMlPJo/rTVfZA5ijuGxSUnMyy1KL9O0SuDK+37zC UnDqGGPFlynz2RoYVxxk7GLk5JAQMJH41baaHcIWk7hwbz1bFyMXh5DAEUaJIw8mMUE4yxkl Pi+ZzgRSxSZgJPFiYw9Yh4iAp8Sbe7NYQWxmgWyJry8usIHYwgKBEse/LAaq4QCqCZJY/lgB otxI4tzx84wgYRYBVYmVHSUgYV4BX4ltj4+zQKw6zyjx4X8PK0gNp0CYxLRZoSA1jEC3fT+1 hglik7jErSfzmSBuFpBYsuc8M4QtKvHy8T9WCFtRYl//dHaI+nyJxdNvMkHsEpQ4OfMJywRG 0VlIRs1CUjYLSdksoCuYBTQl1u/ShyhRlJjS/ZAdwtaQaJ0zlx1ZfAEj+ypGjtLi1LLcdCPD TYzA6Dsmwea4g3HBJ8tDjAIcjEo8vAYPjocIsSaWFVfmHmKU5mBREuctu3IwREggPbEkNTs1 tSC1KL6oNCe1+BAjEwenVANjS48p+7nvhxf9OTa7ymbb3YTURe8qE5r+PFpd+ddUcCXP0U0H XC7Ufm3pFfrZ9/r7t7ksF/8wlczr+lwrFOJ2QiHmRfj9dpZZ09c8FWnXnR6bIW//f27OV1v9 naZPOQTz+fjnVJzVnrNyW4dv7jIbgzsbTjt9WLUklqNmx6HLCYxLjpzb4HnlrxJLcUaioRZz UXEiAGEejwqfAgAA Archived-At: Cc: "mpls@ietf.org" , "spring@ietf.org" , "teas@ietf.org" Subject: Re: [spring] New Comments on Segment Routing(7): MTU Challenges for SR X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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quoted-printable

Hi Robin,

 <= /p>

If we have MTU issues wit= h in an area, I see trouble in basic IGP functioning (for example it=A1=AFs= a serious issue with IS-IS for basic operation).

For inter area cases don= =A1=AFt you think it=A1=AFs in PCE/Controller=A1=AFs scope to setup paths b= ased on the advertised MTU (yes, if MTU is advertised on ADJs as proposed below).

 <= /p>

 <= /p>

From: mpls [ma= ilto:mpls-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Wednesday, January 28, 2015 3:06 AM
To: Hannes Gredler
Cc: mpls@ietf.org; spring@ietf.org; teas@ietf.org
Subject: [mpls] =B4=F0=B8=B4: [spring] New Comments on Segment Routin= g(7): MTU Challenges for SR

 

Hi Hann= es,

I have = ever thought about the possible solutions based on the flooded MTU informat= ion through IGP.

There a= re still two possible issues:

1. Inte= r-area for SR-TE path: Maybe we not only introduce the IGP extensions, but = also PCEP extensions.

2. For = SR-BE path, it has to introduce the TE-like end-to-end path calculation at = the ingress node.

 

My conc= ern is not just for the possible solutions, but to explore the essence of S= R which may has much

effect on its deployment= comparing with the existing MPLS protocol. It will be explained in<= span style=3D"font-size:10.0pt;font-family:"Tahoma","sans-se= rif";color:black">

the next comments.

 

 

Regards,

Robin

 

 

 <= o:p>



________________________________________
=B7=A2= =BC=FE=C8=CB: Hannes Gredler [hannes@juniper.net]
=B7=A2= =CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C228=C8=D5 4:01
=CA=D5= =BC=FE=C8=CB: Lizhenbin
=B3=AD= =CB=CD: spring@ietf.org; mpls@ietf.org; teas@ietf.org
=D6=F7= =CC=E2: Re: [spring] New Comments on Segment Routing(7): MTU Challenges for SR=

only can speak for IS-IS -
afaik the Trill extensions gave us a way of signaling the MTU of a link ...=

so what we could do is to advertise the MTU for each adjacency and implemen= t
proper fragmentation at the TE tunnel ingress.

/hannes

On Tue, Jan 27, 2015 at 11:24:23AM +0000, Lizhenbin wrote:
|    Hi all authors of segment routing,
|
|    This is the seventh commens. The issues proposed here a= re for both SR-TE
|    path and SR-BE path.
|
|
|
|             1=             &nb= sp; 1           1 &n= bsp;          1
|      S11-----------S12----------S13---------S14-= --------S15
|       |      =        |      &= nbsp;     |       &n= bsp;   |         &nb= sp; |
|      1|       = ;     1|        = ;   1|          1|&n= bsp;         1|
|       |      =        |      &= nbsp;     |       &n= bsp;   |         &nb= sp; |
|      S21-----------S22----------S23---------S24-= --------S25
|             4=             &nb= sp; 4           4 &n= bsp;          4
|
|
|
|    Still take the topology in the comment 6 as the example= . No matter the
|    loose explicit path or
|
|    the strict explicit path for the loose hop, assume the = MTU of the
|    interface is the same,
|
|    since the depth of the label stacks for the primary pat= h and the backup
|    path are different.
|
|    There is the risk that the effetive payload may transmi= t through the
|    primary path, but may be
|
|    fragmented or dropped in the backup path. As the differ= ence between the
|    label stacks of the
|
|    primary path and the backup path increase, the risk wil= l increase.
|
|
|
|    From the case, we can deduce that the risk may exists f= or any scenarios in
|    which the same traffic
|
|     may switch from one SR path to the other SR path.= The SR path includes
|    SR-TE path such as MPLS TE
|
|    hotstandby/reoptimization and SR-BE path such as TI-FRR= .
|
|
|
|    Besides above issues, LDP/RSVP-TE can support the path = MTU to track the
|    MTU informaiton along the
|
|    LSP through signalling. Then the reasonable MTU info wi= ll be adopted in
|    the ingress node. For both
|
|     SR-TE path (if PCE is not used) and SR-BE path, s= ince there is no
|    signalling to advertise
|
|    the information. How to implement the feature? Or there= maybe the risk
|    that the packet may be
|
|    dropped by the nodes along the LSP.
|
|
|
|
|
|
|
|    Regards,
|
|    Robin

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

--_000_1B502206DFA0C544B7A60469152008633F55CF49eusaamb105erics_-- From nobody Wed Jan 28 20:16:10 2015 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 12E091A1B71; Wed, 28 Jan 2015 20:16:01 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.75 X-Spam-Level: X-Spam-Status: No, score=-1.75 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham 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 PKjFyXGxkO1P; Wed, 28 Jan 2015 20:15:55 -0800 (PST) Received: from usevmg21.ericsson.net (usevmg21.ericsson.net [198.24.6.65]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A5C0F1A1B61; Wed, 28 Jan 2015 20:15:54 -0800 (PST) X-AuditID: c6180641-f79916d00000623a-36-54c954df46b3 Received: from EUSAAHC001.ericsson.se (Unknown_Domain [147.117.188.75]) by usevmg21.ericsson.net (Symantec Mail Security) with SMTP id C7.12.25146.FD459C45; Wed, 28 Jan 2015 22:30:07 +0100 (CET) Received: from EUSAAMB105.ericsson.se ([147.117.188.122]) by EUSAAHC001.ericsson.se ([147.117.188.75]) with mapi id 14.03.0195.001; Wed, 28 Jan 2015 23:15:52 -0500 From: Uma Chunduri To: Lizhenbin , "bruno.decraene@orange.com" , "spring@ietf.org" Thread-Topic: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment Thread-Index: AdAwwguGjUBqe0n9TwWjptOjDFAVZwAFpwMgAIEUtV0ACVGPwABdgjZRAcAYFTA= Date: Thu, 29 Jan 2015 04:15:52 +0000 Message-ID: <1B502206DFA0C544B7A60469152008633F55CF8F@eusaamb105.ericsson.se> References: <5A5B4DE12C0DAC44AF501CD9A2B01A8D2C6A7430@nkgeml506-mbx.china.huawei.com>, <11734_1421337421_54B7E34C_11734_7840_1_53C29892C857584299CBF5D05346208A0EB05CE7@PEXCVZYM11.corporate.adroot.infra.ftgroup> <5A5B4DE12C0DAC44AF501CD9A2B01A8D477269D7@nkgeml506-mbx.china.huawei.com>, <25686_1421575981_54BB872D_25686_9686_1_53C29892C857584299CBF5D05346208A0EB085CD@PEXCVZYM11.corporate.adroot.infra.ftgroup> <5A5B4DE12C0DAC44AF501CD9A2B01A8D47727D4A@nkgeml506-mbx.china.huawei.com> In-Reply-To: <5A5B4DE12C0DAC44AF501CD9A2B01A8D47727D4A@nkgeml506-mbx.china.huawei.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.117.188.10] Content-Type: multipart/alternative; boundary="_000_1B502206DFA0C544B7A60469152008633F55CF8Feusaamb105erics_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupikeLIzCtJLcpLzFFi42KZXLrHW/d+yMkQg0cH1C1+7JjDbLG78Q+7 xa2lK1ktjl/4zejA4tFy5C2rx5IlP5k8Wp6dZAtgjuKySUnNySxLLdK3S+DKuHt6BVPBn1Ms Fd8nv2FvYPwxn6WLkYNDQsBE4m+bdxcjJ5ApJnHh3nq2LkYuDiGBI4wSPT+fM0E4yxklfu49 xghSxSagJ/Fx6k92kISIQAujxJqT61lBJjELKEucuisDUiMsUCZx4E0zG4gtIlAucevLE1YI 20/i7JTP7CA2i4CqxMu1b8BsXgFfiQPzt0Ite8Ms0dB4HizBKRAm0fb3HJjNCHTe91NrmEBs ZgFxiVtP5jNBnC0gsWTPeWYIW1Ti5eN/rBC2ksSkpedYIerzJd5ueswCsUxQ4uTMJywTGEVn IRk1C0nZLCRlEHEtiXkNv6FqFCWmdD9kh7A1Ja5MPgRla0ssW/iaeQEj+ypGjtLi1LLcdCPD TYzAyDsmwea4g3HBJ8tDjAIcjEo8vBsMT4YIsSaWFVfmHmKU5mBREuctu3IwREggPbEkNTs1 tSC1KL6oNCe1+BAjEwenVAPjbPH0qx67JKYkJjyTOGWcVjPD/sgLx7WrxbvOrtsw5UvBacW+ YKM9E1v/XXkxLfzV7JhDO+OPK4RsCFeMf6IUeFDf8hR73Vo3r7uVd/Zm35Fjune0OWbF4Uw3 s90bTaIr56z7mnBj8fy3EtvOCm1gza6qLJ87tfzHB5ND0UoGH3K6hLclvPGdp8RSnJFoqMVc VJwIAP9m4B6dAgAA Archived-At: Cc: "mpls@ietf.org" Subject: Re: [spring] New Comments on Segment Routing(1): Challenge of Ordered mode for SR-BE Path and Incremental Deployment X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Stacked Tunnels for Source Routing \(STATUS\)." 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Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi Robin,

 <= /p>

>As to your suggested solution of the cont= rol plane, it can be done, but it has been the end-to-end path

>calculation like TE instead of the tradit= ional route path calculation.

 <= /p>

Gone through the exchange= below. If I understand correct =A8C

IMO, it=A1=AFs a deployme= nt issue if S13 doesn=A1=AFt support neither SR nor LDP. If LDP is supporte= d stitching should happen on S12 from SR to LDP.

Now, ingress node need no= t have an idea of the stitching  even if S14 is non-SR , as long as it= =A1=AFs label/index is advertised through binding SIDs.

 <= /p>

The missing point AFAICT = is on =A1=B0explanation=A1=B1 of processing of binding SIDs (for mapping se= rver functionality) at ingress node  -

i.e., not only S12 which = realizes S13 (non-SR capable and do the right thing) but S11 should also co= mpute and add

LSP for the binding SID f= or S14 index with best path next-hop  (which is an SR node).

 <= /p>

Is your issues addressed = with this?

 <= /p>

From: spring [= mailto:spring-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Monday, January 19, 2015 10:42 PM
To: bruno.decraene@orange.com; spring@ietf.org
Subject: [spring] =B4=F0=B8=B4: New Comments on Segment Routing(1): C= hallenge of Ordered mode for SR-BE Path and Incremental Deployment

 

Hi Bruno,

Please refer to my inline comments i= dentified with '[Robin]'.

 

Regards,

Robin

 

 

=B7=A2=BC=FE=C8=CB<= span lang=3D"FR" style=3D"font-size:10.0pt;font-family:"Tahoma",&= quot;sans-serif";color:black">: bruno.decraene@orange.com = [bruno.decraene@orange.com]
=B7= =A2=CB=CD=CA=B1=BC=E4: 2015=C4= =EA1=D4=C218=C8=D5 18:13
=CA= =D5=BC=FE=C8=CB: Lizhenbin; spring@ietf.org
=D6= =F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-B= E Path and Incremental Deployment<= /span>

Hi Robin,

 <= /o:p>

Please see inline [Bruno2= ]

 <= /o:p>

Regards,

Bruno

 <= /o:p>

From:<= /b> Lizhenbin [mailto:lizhenbin@huawei.com]
Sent: Sunday, January 18, 2015 6:41 AM
To: DECRAENE Bruno IMT/OLN; sprin= g@ietf.org
Subject: ??: New Comments on Segment Routing(1): Challenge of Ordere= d mode for SR-BE Path and Incremental Deployment

 <= /o:p>

Hi Bruno,

Please refer to my comments inline i= dentified by '[Robin]'.

For LDP, there are two LDP control m= odes:

-- Ordered mode: Depend on the = egress and the downstream node

-- Independent mode: Depend on the d= ownstream node.

In fact, SR is based on IGP and intr= oduces one totally different mode which I called as flooding mode.

-- Flooding mode: Depend the node's = self

[Bruno2] I=A1=AFm not sure to see what you me= an by =A1=B0depend=A1=B1.

In LDP ordered mode, there is a signaling end= to end from the egress to the ingress, roughly a la =A1=B0distance vector= =A1=B1.

In LDP independent mode, the signaling is lim= ited to be 2 adjacent nodes (me, my downstream). So roughly no signaling.

In SPRING, the Link State paradigm is used. Y= ou know the status of the egress and all the links  & nodes.

[Robin]

1. The 'depend' means the label binding for t= he nodes in segment routing is stable, after the label binding are flooded,=  for 

every nodes in the network,  once t= here are the routes to the destination nodes address, the ingress LSP can b= e setup to be used

for VPN, etc. For LDP independent, even if th= e route is available, it has to wait for the label mapping from the downstr= eam to

setup the ingress LDP to be used for VPN, etc= .

2. I am not sure what's the link state paradi= gm you mean? For LDP, it depends on IGP, it can also use the link state par= adigm.

The only difference is that the segment routi= ng can use it conveniently since the label binding coexists with link state= paradigm.

 

 

 

 

Comparing the there mode, the flooding mode is m= ore independent. This means it is the essiest one= to

set up the interrupted LSP and leak = the useless traffic into the network which will have negative effect

on the normal traffic in the network= .

[Bruno2] I disagree. You have the link state = vision of the whole SPRING network. That=A1=AFs the =A1=B0mode=A1=B1 which = provides the more information. <= span style=3D"font-size:10.0pt;font-family:"Tahoma","sans-se= rif";color:#1F497D">Specifically,

 You know = that the egress is =A1=B0up=A1=B1 and that all nodes on the way are also = =A1=B0up=A1=B1 and ready (I do mean from a SPRING/MPLS standpoint).=

Obviously, this is a control plan vision only= . If you want to check the FIB, you will need to test it (e.g. LSP Ping)

[Robin]

I understand your point about the control pla= ne solution to some extent. In fact, I have also thought about solutions fo= r the the possible

interruption issues for SR-BE path. As t= o your suggested solution of the control plane, it can be done, but it has = been the end-to-end path

calculation like TE instead of the traditiona= l route path calculation.

 

 

Best Regards,=

Robin

 

 

=B7=A2=BC=FE=C8=CB<= span style=3D"font-size:10.0pt;font-family:"Tahoma","sans-se= rif";color:black">: bruno.decraene@orange.c= om [bruno.decraene@orange.com]
=B7= =A2=CB=CD=CA=B1=BC=E4: 2015=C4= =EA1=D4=C215=C8=D5 23:56
=CA= =D5=BC=FE=C8=CB: Lizhenbin; spring@iet= f.org
=D6= =F7=CC=E2: RE: New Comments on Segment Routing(1): Challenge of Ordered mode for SR-B= E Path and Incremental Deployment

Hi Robin,

 <= /o:p>

Thanks for your interest = on SR/SPRING.

Please see in= line. [Bruno]

 <= /o:p>

From:<= /b> spring [mailto:spring-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Thursday, January 15, 2015 2:12 PM
To: spring@ietf= .org
Subject: [spring] New Comments on Segment Routing(1): Challenge of O= rdered mode for SR-BE Path and Incremental Deployment

 <= /o:p>

Hi all authors of segment routing,<= /o:p>

 

When we did research on segment routing and found some new issues. Cou= ld you help clarify if the analysis is right and

how will they be taken into account in the design of SR.

 

This is the first issue.

           &nbs= p;            &= nbsp;  (Non-SR)
  S11-----------S12----------S13---------S14
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
   |          &= nbsp;  |          &n= bsp; |           |
  S21-----------S22----------S23---------S24
 
As above topoloby, there are 8 nodes and assume all the metics of the links= are 1 and VPNs are deployed
on S11/S21/S14/S24.


If LDP is used as the tunnel for VPN on S11/S14, since LDP can support the = ordered mode. The LSP for the S14 will be
setup as the order S14->S13->S12->S11 for distribution of label ma= pping. And the shortest path for routes
to S14 is also S11->S12->S13->S14. So the end-to-end LSP to S14 is= setup. If one node (e.g. S13) does not
support LDP, according to LDP ordered mode, the end-to-end LSP cannot setup= since S12 does not receive the label
mapping from the exact nexthop of the route, S13 and it will not distribute= the label mapping to S11. And the

result is that the VPN on S11 cannot take the LSP since the LSP c= annot setup on S11. 

[Bruno]

My understanding of your case is the followin= g, please correct me if I=A1=AFm wrong:<= /o:p>

There is no SPRING/SR. All nodes support LDP.= S11, S12, S14 use ordered mode. S13 use independent mode.

 

First, such cases happen today in multiple ve= ndor networks since different implementation used different options.=

Then, I believe that your understanding of LD= P independant mode  is incorrect. In independent mode, S13 always adve= rtises the S14 FEC to its neighbor, even if it don=A1=AFt gets a label mapping from its downstream S14. This FEC is then propagated to S11 = in ordered mode.

As a result, S11 gets a label for S14 and wil= l use S14 for the VPN. However in the forwarding plane the traffic will be = dropped on S13.

[Robin] It has explained in the previous mail= . Please rethink the case that S13 does not support LDP instead of that S13= support independent mode.<= /p>

 

 

 

If SR-B= E path is used as the tunnel for VPN on S11/S14 and assume the S13 cannot support the SR, according to my
understanding, there will be an SR-BE path for the destination S14 which is= interrupted at S12. This is similar as
the independent mode of LDP. If this VPN takes this SR-BE Path at S11, the = VPN traffic will be dropped at S12.

If the analysis is right. I have two questions:
1. How will SR avoid such risk? Some enhancement on SR or just leave it to = the local implmentation (For example,
LSP ping is firstly used to check the connectivity)?

[Bruno] A priori, I could see 3 answers

-a- I guess one could use IGP multi-topology = to handle a different topology between the IP and the MPLS one. This is sim= ilar to IPv6 introduction in a IPv4 network.=

-b- Another option is to enable interworking = between LDP and SR/SPRING to handle such incremental deployment. Please see= the following draft for an introduction on this interworking: https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp-inter= op-02 Comments are welcomed as I agree with you that=A1=AFs an importan= t topic for brownfield incremental deployment=

[Robin] I do not think multi-topoloty and SR-= LDP interop will propose can not solved the issued.

[Bruno2] Not sure why you use double negation= . But in short, you also believe this should work.

 

[Robin]

But the price is high. In fact, I have read t= he draft. But I do not think think it is an easy work according to the past= experience in the MPLS world. I will explain the possible work should be taken into account in the subsequent comments. A small exam= ple, SR claimed it can replace the IGP-LDP sync. But as a developer, I am s= ure that the effort of implementation of SR-LDP interop is much more t= han IGP-LDP sync. Can I say that in fact SR does not save our effort, but make more trouble?

[Bruno2] The use of SR-LDP interwork allows i= ncremental deployment of SR with incremental benefit but is indeed an addit= ional work. It is only needed in a multi-vendor/plateform network when all nodes do not support SR, for a limited duration. It= =A1=AFs not long term feature. If you ask me, I would rather not have to us= e it, but it depends on the willing of vendors to implement the required IG= P sub-TLVs. If we all agree that implementing such sub-TLV is easier and better (or if you assume mono vendor deployment= , which I don=A1=AFt) we won=A1=AFt need to deploy/implement LDP-SPRING int= erworking. This is a roadmap versus deployment date issue, so a bit out of = scope of this mailing list. However, from the mailing list standpoint, the point is that this can be done (specified= and implemented)

 

-c- Another option is to incrementally deploy= SR in addition to LDP and to prefer LDP for end to end LSP (using administ= rative distance). Then it=A1=AFs up to each SR application to see how much they can take benefit of partial SR deployment. e.g. FRR (= TI-LFA, RLFA or DLFA) may/should be able to benefit from partial deployment= .

[Robin] The difficulty is that the ingress no= de cannot determine if the SR-BE path is end-to-end without extra methods w= hich is unnecessary for the LDP already deployed in the whole network.

[Bruno2] Again, No. please see https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-03#s= ection-3 The ingress knows, within its IGP area/level, all nodes which = supports SPRING or not. This includes nodes on the SPT to the egress.

 

 

 

FYI, as of today/myself I say that =A1=B0b=A1= =B1 is required and =A1=B0c=A1=B1 is nice to have.


2. Assume LDP is already deployed on all nodes in the network to bear VPN t= raffic. When SR-BE path is adopted in the
network to replace LDP LSP, since there is the possible risk proposed by in= terrupted SR-BE path and I do not think it

is impossible to carefully determine the upgraded nodes.

[Bruno] I=A1=AFm not sure to correctly unders= tand your last sentence. Within an AS (well area/level) It is possible to i= dentify nodes which are SR/SPRING compliant (or non compliant) as they advertise this in the link state IGP.

[Robin] I agree your proposed the increm= ental deployment method by IGP extension to identifed the SR-node. This is = not what my objective. My case is to show that the scope of end-to-end LSP and the scope of the SR nodes is different. The incremental= deployment of SR cause the issue for the end-to-end LSP.

 [Bruno2] I=A1=AFm not= sure to see your point. In particular by =A1=B0end-to-end=A1=B1 to you mea= n within an area/level, or across ASes? Because as SPRING uses the IGP, IGP frontiers makes a diff= erence. Can you please rephrase or bring an non-working example?

 

So the = only choice is to upgrade all nodes to support SR all at once.

[Bruno] No.

[Robin] I can agree you that it may be necess= ary. But more details be taken into account and the price may be high and .=

 

is that= right that the incremental deployment of SR in such scenario is difficult = to adopt?

 

 

 

Regards,Zhenbin(Robin)

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Hi Uma,

Please refer to my inline comments.

 

Regards,

Robin

 

=B7=A2=BC=FE=C8=CB: Uma Chunduri [uma.chun= duri@ericsson.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C229=C8=D5 12:01
=CA=D5=BC=FE=C8=CB: Lizhenbin; Hannes Gredler
=B3=AD=CB=CD: mpls@ietf.org; spring@ietf.org; teas@ietf.org
=D6=F7=CC=E2: RE: [spring] New Comments on Segment Routing(7): MTU C= hallenges for SR

Hi Robin,

 

If we have MTU issues with in an area, I s= ee trouble in basic IGP functioning (for example it=A1=AFs a serious issue = with IS-IS for basic operation).

[Robin] I agree with you that there exists= the MTU issue for the routing functioning. But the MTU issue can be solved= by the path MTU mechanism provided by LDP/RSVP-TE. My question is whether SR path based on the MPLS forwardin= g plane is the comparative with the routing or MPLS LSP.

 

For inter area cases don=A1=AFt you think = it=A1=AFs in PCE/Controller=A1=AFs scope to setup paths based on the advert= ised MTU (yes, if MTU is advertised on ADJs as proposed below).

[Robin] In fact, in the comments (8) I hav= e explained the possible solutions. Do you think the solution is too comple= x for the path MTU of SR which could have be solved by the path MTU information exchange through only LDP = or RSVP-TE while for the SR path it has to introduce IGP-based MTU advertis= ement, the end-to-end path MTU computation in the ingress node, and PCE-bas= ed end-to-end MTU information collection?  Even so, for SR-BE path, there is still challenges for the path MTU. Moreo= ver, this is just for the path MTU. Taking into account more scenarios whic= h needs the information exchanging along the nodes of LSP such as path reco= rding, loop prevention, error handling and other existing features of LDP/RSVP-TE, what is possible complexity fo= r SR solutions?

 

--

Uma C.

 

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Lizhenbin
Sent: Wednesday, January 28, 2015 3:06 AM
To: Hannes Gredler
Cc: mpls@ietf.org; spring@ietf.org; teas@ietf.org
Subject: [mpls] =B4=F0=B8=B4: [spring] New Comments on Segment Routing(7): MTU Challenges= for SR

 

Hi H= annes,

I ha= ve ever thought about the possible solutions based on the flooded MTU infor= mation through IGP.

Ther= e are still two possible issues:

1. I= nter-area for SR-TE path: Maybe we not only introduce the IGP extensions, b= ut also PCEP extensions.

2. F= or SR-BE path, it has to introduce the TE-like end-to-end path calculation = at the ingress node. 

My c= oncern is not just for the possible solutions, but to explore the essence o= f SR which may has muc= h

effect on its deploym= ent comparing with the existing MPLS protocol. It will be explained in

the next comments.

 

 

Regards,

Robin

 

 

 



________________________________________
=B7=A2= =BC=FE=C8=CB: Hannes Gredler [hannes@juniper.net]
=B7=A2= =CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C228=C8=D5 4:01
=CA=D5= =BC=FE=C8=CB: Lizhenbin
=B3=AD= =CB=CD: spring@ietf.org; <= a href=3D"mailto:mpls@ietf.org" target=3D"_blank"> mpls@ietf.org; teas@= ietf.org
=D6=F7= =CC=E2: Re: [spring] New Comments on Segment Routing(7): MTU Challenges for= SR

only can speak for IS-IS -
afaik the Trill extensions gave us a way of signaling the MTU of a link ...=

so what we could do is to advertise the MTU for each adjacency and implemen= t
proper fragmentation at the TE tunnel ingress.

/hannes

On Tue, Jan 27, 2015 at 11:24:23AM +0000, Lizhenbin wrote:
|    Hi all authors of segment routing,
|
|    This is the seventh commens. The issues proposed here a= re for both SR-TE
|    path and SR-BE path.
|
|
|
|             1=             &nb= sp; 1           1 &n= bsp;          1
|      S11-----------S12----------S13---------S14-= --------S15
|       |      =        |      &= nbsp;     |       &n= bsp;   |         &nb= sp; |
|      1|       = ;     1|        = ;   1|          1|&n= bsp;         1|
|       |      =        |      &= nbsp;     |       &n= bsp;   |         &nb= sp; |
|      S21-----------S22----------S23---------S24-= --------S25
|             4=             &nb= sp; 4           4 &n= bsp;          4
|
|
|
|    Still take the topology in the comment 6 as the example= . No matter the
|    loose explicit path or
|
|    the strict explicit path for the loose hop, assume the = MTU of the
|    interface is the same,
|
|    since the depth of the label stacks for the primary pat= h and the backup
|    path are different.
|
|    There is the risk that the effetive payload may transmi= t through the
|    primary path, but may be
|
|    fragmented or dropped in the backup path. As the differ= ence between the
|    label stacks of the
|
|    primary path and the backup path increase, the risk wil= l increase.
|
|
|
|    From the case, we can deduce that the risk may exists f= or any scenarios in
|    which the same traffic
|
|     may switch from one SR path to the other SR path.= The SR path includes
|    SR-TE path such as MPLS TE
|
|    hotstandby/reoptimization and SR-BE path such as TI-FRR= .
|
|
|
|    Besides above issues, LDP/RSVP-TE can support the path = MTU to track the
|    MTU informaiton along the
|
|    LSP through signalling. Then the reasonable MTU info wi= ll be adopted in
|    the ingress node. For both
|
|     SR-TE path (if PCE is not used) and SR-BE path, s= ince there is no
|    signalling to advertise
|
|    the information. How to implement the feature? Or there= maybe the risk
|    that the packet may be
|
|    dropped by the nodes along the LSP.
|
|
|
|
|
|
|
|    Regards,
|
|    Robin

| _______________________________________________
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Hi Robert,

Pleaser refer to my inline comments.

 

 

Regards,

Robin

 

 

=B7=A2=BC=FE=C8=CB: rraszuk@gmail.com [rra= szuk@gmail.com] =B4=FA=B1=ED Robert Raszuk [robert@raszuk.net]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA1=D4=C228=C8=D5 20:54
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: spring@ietf.org; mpls@ietf.org; teas@ietf.org
=D6=F7=CC=E2: Re: [spring] New Comments on Segment Routing(8): Loop = Prevention and Error Handling for SR

Robin,

Most if not of your observations circle around idea to use segment routing = as MPLS label signalling mechanism. I do not think this is that interesting= scenario. Personally I would not deploy it for such purpose of hop by hop = MPLS switching. We have LDP for that.
 
[Robin]
1. I wonder whether this is your own idea or the well-accepted idea of all = authors of segment routing. From the draft-filsfils-spring-segment-routing-= ldp-interop-02/draft-francois-spring-segment-routing-ti-lfa-01, it seems th= at the SR-BE path is the replacement of LDP. From the draft-ietf-pce-segment-routing-00, it seems that the SR-T= E path is the replacement of RSVP-TE.
2. I think the packet steering is truly an ambiguous concept. I agree with = your usecases. We also appreciated the possible chances proposed by the SR = and promote the idea in my draft draft-li-spring-mpls-path-programming-00&n= bsp;that MPLS label is becoming the indicator beyond the reachability and can be used as the representation of flex= ible services combination. I think these topics can develop the existi= ng IP/MPLS world into some new fields. But the ambiguous thing is that the = traditional routing and MPLS traffic engieering can also be seen as some types of traffic steering. I think this will= be repeated work if SR's objective to solve the internal end-to-end reacha= bility issue. My comments is just to explain the possible challenges and co= mplexity for IGP-based SR path comparing with the existing LDP/RSVP-TE. And I do not think SR c= an solve the issues better than LDP/RSVP-TE though there maybe some ad= vantage. If we can be aware of this, we should stop the complex p= rotocol extensions work for SR in this field. Or else, it is just to make mess in the MPLS world and produce complexity for the service provide= rs.
 
 
This is the reason that the SR proposes too many ambiguous things which I w= ill explain later.
 
 

Contrary I would use SR for controlled packet steering where responsibility= is take to make the right header (be it label or extension headers) upon o= perator or his controller. 

To the point of the loop .. note that you may have valid cases to traverse = given appliance (SFC use case) more then onces hence I would claim it is no= t aa architecture spec problem, but if so deployment bug.

Best,
r.

 

On Wed, Jan 28, 2015 at 12:30 PM, Lizhenbin <lizhenbin@hua= wei.com> wrote:

Hi all authors of segment routing,

 

This is the eighth comments. The issues proposed = here apply to both SR-TE path and SR-BE path.

 

For LDP and RSVP-TE, there is the loop prevention= mechanism when setup LSP. For the SR, the SR path is always

setup at the ingress node. It is difficult to det= ect the possible loop in the network. For example, if the

microloop of route happens, the loop prevention m= echanism will prevent LDP to setup LSP. But for the segment

routing, once the ingress node downloads the forw= arding entry and the traffic will experience the microloop.

How can SR to cope with the issue or just leave i= t as the traditional routing?

 

For LDP and RSVP-TE, there is the error notificat= ion mechanism based on the LDP notification message or the

RSVP-TE PathErr/Resv messages. Based on the error= notification, the nodes along the LSP can take possible

actions against the possible errors. But for SR, = there is no such information communicated among the nodes

along the SR Path. The result will be that once t= he packet is forwarded by the ingress node, they may

experience the possible errors which may be preve= nted by the negotiation in the control plane.

 

From the previous comments, we can see that in th= e traditional LSP, the LSP setup is negotiated through

the signalling between the upstream node and the = downstream node. During the negotiation, it is not only to

set up the forwarding the entry for the purpose o= f reachablity, but also includes many aspects (I call them

as the operation and maintenence of the LSP. Hope= it is appropriate. ) such as the end-to-end connectivity

verification, the loop prevention, path MTU, nego= tiation, path recording, error notification and handling,

etc. Though SR always proposes its advantage, in = my opinion, these advantages are from the reachability

part such as the advantage that the label statck = in the ingress node reduces the states in the network. 

But the requirements of the operational and maint= enance for the traditional LSP still exist. Taking into

account that the flooding mode of the IGP, it sto= ps the communication between the nodes along the path,

the work may become more complex. According to th= e past experience, the possible ways I could think out are

as follows:
1) Depend on the third-party mechanisms. But the problem is that there may = involve more mechanisms and there

may be no mechanisms. For example, LSP Ping can b= e adopted to check the end-to-end connectivity or loop for

the SR-BE path, but it cannot be used for path MT= U negotiation. For the end-to-end path recording, LSP Tracert

may have to be introduced. If these requirements = and mechanisms are considered, it means SR does not reduce

the compexity. Instead it just transfers mor= e complexity to the other possible signallings.
2) Depend on one nodes to implement the possible functions. For example, fo= r SR-TE path, it can depend on the

PCE or the ingress node to collect all path info = proposed by path recording or even path MTU negotiation. Even so,

there is still some drawbacks for some scenarios = if only depend on the ingress node. Moreover these methods
cannot apply to SR-BE path.If the possible wo= rk is done through the ingress node, it will begin to change the

essence of SR-BE and become the SR-TE.
3) Leave as it is. That is, these issues are not solved for SR path. In my = own opinion, 20 years ago, only

solving the reachability issues may be accepted. = But today, as the concept of carrier-grade IP network has been

widely accepted and= these features mentioned has been deployed in the traditional MPLS network= , I don't think

they can be removed easily.

In one word, though some advantage driven from th= e reachbility of SR is apparent, the complexity introcuded by

the synthesized requirements are not reduced. And= it may become more complex for SR.

 

 

 

 

Regards,

Robin

 

 


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


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Hi all authors of segment routing,

 

This is the ninth comments to discuss the possibl= e issues proposed by the interoperability of SR with LDP.

 

In fact, I have not read the draft draft-filsfils= -spring-segment-routing-ldp-interop-02 yet. According to

the past experience, I think the possilbe choice = is no other than hierarchy or stitching.


I propose the first case as the following scenario,<= /font>

 

        &= nbsp; SR          LDP &nb= sp;        LDP    &n= bsp;     SR
  S11-----------S12----------S13---------S14---------S15
   |          &= nbsp;  |          &n= bsp; |           | &= nbsp;         |
   |          &= nbsp;  |          &n= bsp; |           | &= nbsp;         |
   |          &= nbsp;  |          &n= bsp; |           | &= nbsp;         |
  S21-----------S22----------S23---------S24---------S25

Assume all other nodes support SR and o= nly S12/S13/S14 support LDP. If the LSP stitching is adopted, there will

be following process:
-- In S12, the egress SR-BE path will stitch the ingress LDP LSP, If the li= nk between the S12 and S13 fails

firstly, then restored, the IGP-LDP sync is = also necessary.
-- In S14, the egress LDP LSP will stitch the ingress SR-BE path.

 

Morevoer, if the scenario is changes to the oppos= ite way, that is all other nodes support LDP and only S12/S13/= S14

support SR, it has to introduce the proxy egress = for SR-BE path which has explained in the previous comments that <= /font>

it will be difficult to be supported by the SR.

 

From the case, could I say that the SR-LDP intero= perability issue is more difficult that the IGP-LDP sync

which could be removed by SR as claimed? <= /p>

 

 


I propose the second case as the following scenario,=

 

        &= nbsp; LDP          LDP &n= bsp;   
  S11-----------S12----------S13
   |          &= nbsp;           &nbs= p;   |
 SR|           =             &nb= sp;  |SR
   |          &= nbsp;           &nbs= p;   |
  S21-----------S22----------S23
        SR     =         SR

 

Assume S11/S12/S13 support LDP and S11/S21/S22/S2= 3/S13 support SR. If the primary path to S13 is S11->S12->S13

is based on LDP LSP. In order to achieve the 100%= network coverage, LDP remote peer can be set up between S11

and S13 to advertise label mapping directly from = the S13 to S11. The the backup path can be: the backup LDP

label goes through the SR path S11->S21->S2= 2->S23->S13. This means that the Remote LFA must co-exist with TI-LFA= .

Could I say that the combined FRR solutions is mo= re complex than one of these FRR solutions?

 

From the pervious comments, we can see that some = of the existing LDP scenarios cannot be supported by SR-BE path.

This means if SR is adopted, it has to co-exist w= ith LDP in these scenarios. For the legacy network using LDP,

if SR is adopted to replace the LDP, it is also i= nevitable that the SR has to co-exist with LDP.

 

If these scenarios happens, there will be a mess = of solutions in the network. In fact, this is not a new one.

Almost ten years ago, when we implemented the LDP= , we assumed that there can be one network in which some nodes

run LDP DoD, others run LDP DU, some nodes run LD= P Ordered, others run LDP Independent, some nodes run LDP liberal,

others run LDP conservative. Finally we found the= issues could not converge at all. At last we had to give up

and provided the specification for any network th= ere is only one label advertisement mode, only one label

distribution mode, only one label retention mode.= Until today DU + Ordered + Liberal becomes almost the most

popular choice.

 

But for SR, it works in the totally dif= ferent way from the LDP in many aspects. If SR and LDP co-exist in one

network and the behaviors could not be unifyed th= rough the unifying configuration, the mess of the solutions

is inevitable. Taking into account SR's interwork= ing with LDP's two LSP advertisement mode, two LSP distribution

mode, two label retension mode, two types of LDP = peer as well as new IGP-LDP stiching/hierarchy/sync and the

intworking LFA/R-LFA FRR for LDP with the TI-LFA = for SR, I don't think this is an easy work to clarify all

possible details in one draft and much of the det= ails maybe implementation specific and potential risk for the
interoperability. Moreover, based on the analysis in the previous comments,= there is some requirements of LDP

which cannot be supported by SR-BE path yet now. = If these issues are not solved, the introducing of SR in the

LDP network will affect the normal process of LDP= .

 

According to the above analyisis, my recommendati= on for the network transition is that if there is the scenario

in which SR-BE path is truly applicable, it is be= tter to replace the existing LDP all at once to avoid the possible

interoperability issue.

 

Regarding the interoperability of SR-TE path with= RSVP-TE, the general problem is that both SR-TE path and RSVP-TE

cannot support proxy egress now and the stitching= would not work at all. The only way is just to replace the whole

RSVP-TE LSP with the SR-TE path if the SR-TE path= is truly applicable.

 

 

 

Regards,

Robin

 

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