IETF Logo Mail Archive

Re: [Bier] comments on draft-zwzw-bier-prefix-redistribute

Zhang Z <zzhang_ietf@hotmail.com> Mon, 19 March 2018 14:53 UTC

Return-Path: <zzhang_ietf@hotmail.com>
X-Original-To: bier@ietfa.amsl.com
Delivered-To: bier@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 719181277BB for <bier@ietfa.amsl.com>; Mon, 19 Mar 2018 07:53:29 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.125
X-Spam-Level:
X-Spam-Status: No, score=-1.125 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FORGED_HOTMAIL_RCVD2=0.874, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=hotmail.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qw5N6efV0jM4 for <bier@ietfa.amsl.com>; Mon, 19 Mar 2018 07:53:28 -0700 (PDT)
Received: from NAM03-CO1-obe.outbound.protection.outlook.com (mail-oln040092007056.outbound.protection.outlook.com [40.92.7.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7C74712778D for <bier@ietf.org>; Mon, 19 Mar 2018 07:53:28 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hotmail.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=LPGBDPZBUn56TUKMFRfS/3qTv0wClG9//kjTLyO7BMs=; b=gw+JMsGNxb/PzS7hKvzH5g/IotBVLRhUaKduODMJ82GB7UCuFyhx8Yrrjj/q/8fWlwqdfs8aQ7pWiTsiXjzvc9rhLstrYYWRJWtW6VKdtx8DC4waf+9quI6xs0e8qXGjQxIXJMREzO8/e/WeXCTt6Qgap8ditNWNTBJrXDfzmO73/SkMsgZj++y7zkpLjBNjmJnn5rRd9diMmDxcTQJGKVoXirzsvtr/WZayU2UzQYk/lFxnZNEqtrmmNaZP4khHxBJQUN75LknM2nQLAFpab3NzrSqAVEJa23YPvEtNppjGI4S7KGgU2NMjzEB321sNePkEN986ZfL/vbJUNNxMRA==
Received: from DM3NAM03FT025.eop-NAM03.prod.protection.outlook.com (10.152.82.58) by DM3NAM03HT009.eop-NAM03.prod.protection.outlook.com (10.152.82.119) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.567.18; Mon, 19 Mar 2018 14:53:27 +0000
Received: from CY1PR07MB2634.namprd07.prod.outlook.com (10.152.82.53) by DM3NAM03FT025.mail.protection.outlook.com (10.152.82.181) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.567.18 via Frontend Transport; Mon, 19 Mar 2018 14:53:27 +0000
Received: from CY1PR07MB2634.namprd07.prod.outlook.com ([10.167.16.148]) by CY1PR07MB2634.namprd07.prod.outlook.com ([10.167.16.148]) with mapi id 15.20.0588.016; Mon, 19 Mar 2018 14:53:27 +0000
From: Zhang Z <zzhang_ietf@hotmail.com>
To: Tony Przygienda <tonysietf@gmail.com>, BIER WG <bier@ietf.org>
Thread-Topic: [Bier] comments on draft-zwzw-bier-prefix-redistribute
Thread-Index: AQHTv4TaS46lUSroYESyNsYJxGFVmaPXmfgd
Date: Mon, 19 Mar 2018 14:53:27 +0000
Message-ID: <CY1PR07MB26340B39E9749405A67ECEB18ED40@CY1PR07MB2634.namprd07.prod.outlook.com>
References: <CA+wi2hOjtf+S=u0m31ouTeBC18uat3EufgrhV27TztgLMD6MKA@mail.gmail.com>
In-Reply-To: <CA+wi2hOjtf+S=u0m31ouTeBC18uat3EufgrhV27TztgLMD6MKA@mail.gmail.com>
Accept-Language: zh-CN, en-US
Content-Language: zh-CN
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-incomingtopheadermarker: OriginalChecksum:A9BE42C6F50FD28FD6BD05A861480AA7094D8BDA0976691E35657F49A0B7482C; UpperCasedChecksum:6989B3B4F9F081E405CE38DBBCE4E9FADF799668DAEB943F2FE7712AF16D7C0F; SizeAsReceived:7172; Count:46
x-ms-exchange-messagesentrepresentingtype: 1
x-tmn: [Kq7vDCBMdWE7WJUKYv/rHwT5brp4XL7A]
x-ms-publictraffictype: Email
x-microsoft-exchange-diagnostics: 1; DM3NAM03HT009; 6:9FTrZuSkt17F5ugFZ3jouDwOA8LajrcImM3yMGH+Nms8eZG5Iux6xwdU9OcqVv8pFucImmRP5qFyKhLJSKqQhLTHyjM0rfEWfuNDDYYdEzeO5BP1o6FU6yTiJZ7IEVAlALGTJ0YZGlz232cPz6Te4QCBk0nUQWs+oXSVSE/BoX3GC6JUlkQIXp/mMqYElaJhVhgWWT1Moqh6srmwQMZ1MoXgY2JE3uNP9BpebTH6m9AyTOwclqgHGQwPr2lNUXtY9/ixfJE9nH/i0hbO99kCzPvIgmhs0LmkPRyVGfe66+qWaB06RcOQKXL4BOiZ839u4UrG8CkwBd/yWVu7hEQE5VV0WOLOBLVsVZyjsqFxKSM=; 5:6alH01fueMYcDvnc1w5VGo+r+uGEtyK0XNOeUzZlrxKJC8u6uKUWNA69D3FlRPgkYzxFIfOETAAVLyU41zYtEuTaCDK6Bur/ZDomJhJ8Q1c6KppWDhZ/jWn3UsvBVjx+mXfsPBLEwdDBqoRtNPE6OkDTNOedI+9YwdloSrO0Rhk=; 24:lxg3LdLGqaX5Z7ZXe0J83NBczBD2wk4QCy3wAuXRaP/sz4y7QpJ84hXQujC1CfVhWMW5oyzpGmLcii6zjRa1grJmOLsN8z8o7AxT59mjSvU=; 7:knD0vFEXtNkpR3rkcC9sSwI27c1ksHrd/EK60/Q6SoBM20LXH4hx+NQpaBWRy037GmaDpIP7dfxF0UfqL4gaBhvTOmMipE3FFrBtK11xdYl0ggF9ej3EDMwwIHNAk7vnov/0bG/WMqChaiScc/a50FEdeFZJEZKpUgBGrX5zGkOvSyTgITE1QG93RRC9ZqDH+AAS1t56e3fJb7/T8rINIrRxN0fWCilZHJPDl6QhInAePIZpiC/n5KK/ZzDlmecY
x-incomingheadercount: 46
x-eopattributedmessage: 0
x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(201702061078)(5061506573)(5061507331)(1603103135)(2017031320274)(2017031324274)(2017031323274)(201702181274)(2017031322404)(1601125374)(1603101448)(1701031045); SRVR:DM3NAM03HT009;
x-ms-exchange-slblob-mailprops: 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
x-ms-traffictypediagnostic: DM3NAM03HT009:
x-ms-office365-filtering-correlation-id: b907e7d7-d0e7-485d-4d0d-08d58da92c76
x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(444000031); SRVR:DM3NAM03HT009; BCL:0; PCL:0; RULEID:; SRVR:DM3NAM03HT009;
x-forefront-prvs: 06167FAD59
x-forefront-antispam-report: SFV:NSPM; SFS:(7070007)(98901004); DIR:OUT; SFP:1901; SCL:1; SRVR:DM3NAM03HT009; H:CY1PR07MB2634.namprd07.prod.outlook.com; FPR:; SPF:None; LANG:;
x-microsoft-antispam-message-info: uXvptM+qkctjs15LnbTQuO9i57ZvA0HQSTm4/7PgkYWj90PZ96hCORyvZbOEMCt3Z4htbo4zqZOhuaqYqmHp0vMA+sx79baIRr9KhiSmzom42i3bnmp6KJsy2K73f5B+ZuFEkFiaol0rqNeVZRUyRReTWiNe9V4vg0KwUH85xfCLnLTEJ3bHLM3DN5hi1Meg
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="gb2312"
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-OriginatorOrg: hotmail.com
X-MS-Exchange-CrossTenant-Network-Message-Id: b907e7d7-d0e7-485d-4d0d-08d58da92c76
X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 14:53:27.7108 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Internet
X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3NAM03HT009
Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/1HGjR4OJ8_5uiPa_U5e1ISFo-fU>
Subject: Re: [Bier] comments on draft-zwzw-bier-prefix-redistribute
X-BeenThere: bier@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: "\"Bit Indexed Explicit Replication discussion list\"" <bier.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/bier>, <mailto:bier-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/bier/>
List-Post: <mailto:bier@ietf.org>
List-Help: <mailto:bier-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/bier>, <mailto:bier-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 19 Mar 2018 14:53:29 -0000

Hi Tony,

Thank you for your comments. Please see in line.

Thanks,
Sandy
________________________________
发件人: BIER <bier-bounces@ietf.org> 代表 Tony Przygienda <tonysietf@gmail.com>
发送时间: 2018年3月19日 21:18:13
收件人: BIER WG
主题: [Bier] comments on draft-zwzw-bier-prefix-redistribute

Read with interest draft-zwzw-bier-prefix-redistribute. Comments

1. Figure 2 is mildly confusing. Where is area 0? Once we have area 0 the current OSPF RFC (upcoming) is already dealing with redistribution within OSPF. So I think a realistic problem is redistributing from OSPF into ISIS or vice versa (or multiple instances of OSPF/ISIS edge/core facing) ...

Sandy: There's no OSPF area 0 but ISIS level-2 area instead of it. ABRs translate the routing info from ISIS to OSPF or vice versa, such as R3, R4.

2. The really hard problem of how to prevent redistribution loops is not tackled. As long we assume a star topology the tie-breaking is trivial but when e.g. two ASBRs from two different OSPF areas attach to ISIS we already have a problem and even worse if spokes have e.g. ASBR shortcuts to prevent going through the backbone. And what happens if two different protocols pick up same BFR-id or advertise conflicting information. Basically we need a DV/PV protocol to make that work in generic sense.

Sandy: The bfr-id conflicting is a general problem but sure it may be more terrible when two different protocols are used. We will consider it in next version.

3. Alternately we could introduce the concept of a proxy-BFR that advertises a BFR-id into two subdomains and forwards between them but I think when this is thought through it will looks like PMSI stitching and with that implode into MVPN overlay solution doing inter-domain multicast.

Sandy: Yes. It looks like PMSI stitching but the forwarding plane can't be builded if underlay protocol doesn't take part in.

Let's see the discussion on the floor

--- tony

v2.23.0 | Report a Bug | By Email