From rtg-bfd-bounces@ietf.org Wed Jun 08 12:43:11 2005 Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1Dg3e3-0003OB-A9; Wed, 08 Jun 2005 12:43:11 -0400 Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1Dg3e2-0003O1-I1 for rtg-bfd@megatron.ietf.org; Wed, 08 Jun 2005 12:43:10 -0400 Received: from ietf-mx.ietf.org (ietf-mx.ietf.org [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id MAA15742 for ; Wed, 8 Jun 2005 12:43:07 -0400 (EDT) Received: from nproxy.gmail.com ([64.233.182.198]) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1Dg3zJ-0000dF-O0 for rtg-bfd@ietf.org; Wed, 08 Jun 2005 13:05:11 -0400 Received: by nproxy.gmail.com with SMTP id n15so184285nfc for ; Wed, 08 Jun 2005 09:42:57 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=mzL5DKnc266BrKObplOTUZ7YC8jR2VztL7DKut7Lie8TunQDQ6bDgIFZJ85BXmY71Foy0Tdqwf6QmdSgCVI3+FEh6ABmJVbvncljFV4zxhhMyvVy1xWDrWxrWIeFk/8wcMm9+afu9t2wFSW+tXuDy9Yn0bXD/ULZ2HaDVWFGYLU= Received: by 10.48.248.5 with SMTP id v5mr103716nfh; Wed, 08 Jun 2005 09:42:57 -0700 (PDT) Received: by 10.48.247.19 with HTTP; Wed, 8 Jun 2005 09:42:57 -0700 (PDT) Message-ID: <9e31186f0506080942535037a4@mail.gmail.com> Date: Wed, 8 Jun 2005 18:42:57 +0200 From: Carlos Garcia Braschi To: rtg-bfd@ietf.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-Spam-Score: 0.0 (/) X-Scan-Signature: 769a46790fb42fbb0b0cc700c82f7081 Content-Transfer-Encoding: quoted-printable Cc: David Ward , Dave Katz Subject: Single-hop BFD for RIP routing protocol X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Carlos Garcia Braschi List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: rtg-bfd-bounces@ietf.org Errors-To: rtg-bfd-bounces@ietf.org Hi, We see a need in our network to also have a BFD single hop implementation to help the RIP protocol, as an alternative to BGP for simple cases where the amount of routes announced is small, as it allows less protocol overhead and more predictable and somewhat simpler implementations. Could this be an item for this working group? I'd like to have a standard way to do that, so that it is interoperable among vendors. Although to me it seems quite obvious and on previous discussions in the group seems that most of this applications of BFD to routing protocols are quite simple, I have written down a description of the expected behaviour, although is not probably in a situation to be part of a draft, it could be a starting point: "Any host or router (I'll stick with router from now on, but it applies to both) that receives a RIP route update and has the BFD feature enabled, tries to establish a BFD session with the next-hop IP address for each route (be it the source of the update or a next-hop in a route), if it does not have a suitable BFD session already established. When a router has a BFD session established, and the session changes to the "Down" state, all the routes that have the other side as next-hop have to be deleted, and a route update should be sent following the procedure for a triggered RIP update. When the RIP timeout timer for a route expires, and that route is the last one to point to a next hop with which there is a BFD session, that session must be torn down. While a router cannot establish a BFD session with a next-hop, it behaves like it would with a non-BFD RIP implementation, allowing in this way a mix of BFD and non-BFD routers in a subnet. BFD session establishment attempts should do an exponential back-off and not retry establishment if an ICMP port unreachable message is received (should this be left to implementations?). A router with the RIP BFD extension must accept BFD sessions from any router that belongs to any subnet to which it is annnouncing RIP updates. All authentication mechanisms in BFD may be used to mitigate the possibilities of abuse." BTW, what happened to the static route and BGP case? Will they be in a separate draft? Regards, Carlos. Telefonica Empresas. From rtg-bfd-bounces@ietf.org Wed Jun 22 09:44:59 2005 Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1Dl5XH-0006bI-IL; Wed, 22 Jun 2005 09:44:59 -0400 Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1Dl5XF-0006YG-Kk for rtg-bfd@megatron.ietf.org; Wed, 22 Jun 2005 09:44:57 -0400 Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id JAA10594 for ; Wed, 22 Jun 2005 09:44:54 -0400 (EDT) From: richard.spencer@bt.com Received: from smtp5.smtp.bt.com ([217.32.164.139]) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1Dl5vM-00008v-Gl for rtg-bfd@ietf.org; Wed, 22 Jun 2005 10:09:53 -0400 Received: from i2km98-ukbr.domain1.systemhost.net ([193.113.197.85]) by smtp5.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.211); Wed, 22 Jun 2005 14:43:42 +0100 Received: from i2km41-ukdy.domain1.systemhost.net ([193.113.30.29]) by i2km98-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(5.0.2195.6713); Wed, 22 Jun 2005 14:43:37 +0100 X-MimeOLE: Produced By Microsoft Exchange V6.0.6603.0 content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Date: Wed, 22 Jun 2005 14:42:45 +0100 Message-ID: Thread-Topic: BFD echo mode interoperability Thread-Index: AcV3L9Wb+5UEN0LhTg2AcwFAkbJV3Q== To: X-OriginalArrivalTime: 22 Jun 2005 13:43:37.0746 (UTC) FILETIME=[64751F20:01C57730] X-Spam-Score: 0.3 (/) X-Scan-Signature: ea4ac80f790299f943f0a53be7e1a21a Content-Transfer-Encoding: quoted-printable Subject: BFD echo mode interoperability X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: rtg-bfd-bounces@ietf.org Errors-To: rtg-bfd-bounces@ietf.org Colleagues, I've been looking at the BFD base draft and am struggling to understand = how interoperable BFD solutions can be developed using echo mode. The draft states "The means by which the Echo function failures are = detected is outside of the scope of this specification. Any means which = will detect a communication failure is acceptable." The draft also = states "A means of detecting missing Echo packets must be implemented, = which most likely involves processing of the Echo packets that are = received. The processing of received Echo packets is otherwise outside = the scope of this specification." This is in contrast to the asynchronous mode which uses the detect = multiplier to define how many consecutive packets must be missed in = order to declare a session down. I have seen an implementation that uses = the detect multiplier for echo packets as well as control packets, but = this behaviour is not specified in the draft. If two vendors decide to use different methods/settings for fault = detection using echo mode, this will be a real pain to configure/manage, = and will also require translation between different methods in order to = ensure symmetry in detecting failures in order to avoid black holing = traffic. Unless I've missed something, using echo mode in a multivendor = environment does not look like an attractive solution. Regards, Richard From rtg-bfd-bounces@ietf.org Thu Jun 23 07:15:23 2005 Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1DlPg3-0003sv-N5; Thu, 23 Jun 2005 07:15:23 -0400 Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1DlPfy-0003sR-Dr; Thu, 23 Jun 2005 07:15:18 -0400 Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id HAA27619; Thu, 23 Jun 2005 07:15:17 -0400 (EDT) Received: from szxga02-in.huawei.com ([61.144.161.54] helo=huawei.com) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1DlQ4F-0005dm-LK; Thu, 23 Jun 2005 07:40:26 -0400 Received: from huawei.com (szxga02-in [172.24.2.6]) by szxga02-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0IIJ00E75BI9NG@szxga02-in.huawei.com>; Thu, 23 Jun 2005 19:20:33 +0800 (CST) Received: from szxml02-in ([172.24.1.6]) by szxga02-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0IIJ004PABI9LR@szxga02-in.huawei.com>; Thu, 23 Jun 2005 19:20:33 +0800 (CST) Received: from z11024 ([10.110.100.95]) by szxml02-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTPA id <0IIJ005H6BI45V@szxml02-in.huawei.com>; Thu, 23 Jun 2005 19:20:29 +0800 (CST) Date: Thu, 23 Jun 2005 19:15:26 +0800 From: zhaisuping To: "internet-drafts@ietf.org" Message-id: <0IIJ005H7BI45V@szxml02-in.huawei.com> Organization: huawei MIME-version: 1.0 X-Mailer: Foxmail 4.2 [cn] Content-type: text/plain; charset=GB2312 Content-transfer-encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Scan-Signature: 7655788c23eb79e336f5f8ba8bce7906 Content-Transfer-Encoding: quoted-printable Cc: "rtg-bfd@ietf.org" , "jhaas@nexthop.com" , "dward@cisco.com" , "dkatz@juniper.net" Subject: bfd application with BGP and static routes draft submission X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: zhaisuping@huawei.com List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: rtg-bfd-bounces@ietf.org Errors-To: rtg-bfd-bounces@ietf.org Dear all, I have written a draft about BFD application with BGP and static= routes, the purpose is to resolve the BFD bootstrapping end= encapsulation problem when in applications. It's 6 pages long,= Comments are very welcome. Please help to post to the IETF website this draft and thank you= for that. Thank you and Best regards.=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1 Best Regards, zhaisuping@huawei.com Huawei Technologies Co., Ltd. Tel: +86-10-82882867 Fax: +86-10-82882537 2005-06-23 From rtg-bfd-bounces@ietf.org Thu Jun 23 07:27:16 2005 Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1DlPrX-0005lj-Un; Thu, 23 Jun 2005 07:27:15 -0400 Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1DlPrV-0005lZ-Pe; Thu, 23 Jun 2005 07:27:13 -0400 Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id HAA28583; Thu, 23 Jun 2005 07:27:07 -0400 (EDT) Received: from szxga03-in.huawei.com ([61.144.161.55] helo=huawei.com) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1DlQFa-0006Cf-KC; Thu, 23 Jun 2005 07:52:16 -0400 Received: from huawei.com (szxga03-in [172.24.2.9]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0IIJ009TQBIMK6@szxga03-in.huawei.com>; Thu, 23 Jun 2005 19:20:46 +0800 (CST) Received: from szxml01-in ([172.24.1.3]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0IIJ00DSMBIMZB@szxga03-in.huawei.com>; Thu, 23 Jun 2005 19:20:46 +0800 (CST) Received: from z11024 ([10.110.100.95]) by szxml01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTPA id <0IIJ00597BSE5U@szxml01-in.huawei.com>; Thu, 23 Jun 2005 19:26:38 +0800 (CST) Date: Thu, 23 Jun 2005 19:18:33 +0800 From: zhaisuping To: "internet-drafts@ietf.org" Message-id: <0IIJ00598BSE5U@szxml01-in.huawei.com> Organization: huawei MIME-version: 1.0 X-Mailer: Foxmail 4.2 [cn] Content-type: multipart/mixed; boundary="Boundary_(ID_uXANZnuayzuH9etWsu1HZw)" X-Spam-Score: 0.0 (/) X-Scan-Signature: 9c7d7a899dc8f3389bf7ace6f0ad8e29 Cc: "rtg-bfd@ietf.org" , "jhaas@nexthop.com" , "dward@cisco.com" , "dkatz@juniper.net" Subject: bfd application with BGP and static routes draft submission X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: zhaisuping@huawei.com List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: rtg-bfd-bounces@ietf.org Errors-To: rtg-bfd-bounces@ietf.org This is a multi-part message in MIME format. --Boundary_(ID_uXANZnuayzuH9etWsu1HZw) Content-type: text/plain; charset=GB2312 Content-Transfer-Encoding: quoted-printable I am sorry that I don't attatch the file in the last mail, so I= send the mail again. Sorry for the mistake. Dear all, I have written a draft about BFD application with BGP and static= routes, the purpose is to resolve the BFD bootstrapping end= encapsulation problem when in applications. It's 6 pages long,= Comments are very welcome. Please help to post to the IETF website this draft and thank you= for that. Thank you and Best regards.=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1 Best Regards, zhaisuping@huawei.com Huawei Technologies Co., Ltd. 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--Boundary_(ID_uXANZnuayzuH9etWsu1HZw)-- From rtg-bfd-bounces@ietf.org Tue Jun 28 12:40:48 2005 Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1DnJ8i-0004ed-QH; Tue, 28 Jun 2005 12:40:48 -0400 Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1DnJ8g-0004eY-Ri for rtg-bfd@megatron.ietf.org; Tue, 28 Jun 2005 12:40:46 -0400 Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id MAA29633 for ; Tue, 28 Jun 2005 12:40:44 -0400 (EDT) Received: from nproxy.gmail.com ([64.233.182.203]) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1DnJY1-0001fP-HP for rtg-bfd@ietf.org; Tue, 28 Jun 2005 13:07:01 -0400 Received: by nproxy.gmail.com with SMTP id a4so247709nfc for ; Tue, 28 Jun 2005 09:40:31 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=aQ0L14viQHZ0VpnFZOYmlbON7uHMKZpeaZnDMGn7imFg4AfXR1I8Tq9rxuib2naPwtOuMZbzaaZdfLXz+cE4e1FofC9BMV95PU3BCbwX+RkmGAt6k5hHseCnzpE+7C+/cpf6hK/F3dyljoZUJldJbTmQUyMmukxFHG6lMoXYPSE= Received: by 10.48.3.15 with SMTP id 15mr147337nfc; Tue, 28 Jun 2005 09:40:31 -0700 (PDT) Received: by 10.48.247.19 with HTTP; Tue, 28 Jun 2005 09:40:31 -0700 (PDT) Message-ID: <9e31186f050628094064ddeba0@mail.gmail.com> Date: Tue, 28 Jun 2005 18:40:31 +0200 From: Carlos Garcia Braschi To: rtg-bfd@ietf.org In-Reply-To: <42ba9cf2.0c2ffa65.4985.7adfSMTPIN_ADDED@mx.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=EUC-KR Content-Transfer-Encoding: base64 Content-Disposition: inline References: <42ba9cf2.0c2ffa65.4985.7adfSMTPIN_ADDED@mx.gmail.com> X-Spam-Score: 0.0 (/) X-Scan-Signature: 41c17b4b16d1eedaa8395c26e9a251c4 Content-Transfer-Encoding: base64 Cc: Subject: Re: bfd application with BGP and static routes draft submission X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Carlos Garcia Braschi List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: rtg-bfd-bounces@ietf.org Errors-To: rtg-bfd-bounces@ietf.org MjAwNS82LzIzLCBydGctYmZkLXJlcXVlc3RAaWV0Zi5vcmcgPHJ0Zy1iZmQtcmVxdWVzdEBpZXRm Lm9yZz46Cj4gCj4gTWVzc2FnZTogMgo+IERhdGU6IFRodSwgMjMgSnVuIDIwMDUgMTk6MTg6MzMg KzA4MDAKPiBGcm9tOiB6aGFpc3VwaW5nIDx6aGFpc3VwaW5nQGh1YXdlaS5jb20+Cj4gU3ViamVj dDogYmZkIGFwcGxpY2F0aW9uIHdpdGggQkdQIGFuZCBzdGF0aWMgcm91dGVzIGRyYWZ0IHN1Ym1p c3Npb24KPiBUbzogImludGVybmV0LWRyYWZ0c0BpZXRmLm9yZyIgPGludGVybmV0LWRyYWZ0c0Bp ZXRmLm9yZz4KPiBDYzogInJ0Zy1iZmRAaWV0Zi5vcmciIDxydGctYmZkQGlldGYub3JnPiwgICAg ICAiamhhYXNAbmV4dGhvcC5jb20iCj4gICAgICAgICA8amhhYXNAbmV4dGhvcC5jb20+LCAgICAi ZHdhcmRAY2lzY28uY29tIiA8ZHdhcmRAY2lzY28uY29tPiwKPiAgICAgICAgICJka2F0ekBqdW5p 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(Exim 4.32) id 1DnUB5-0000aE-Pd for rtg-bfd@megatron.ietf.org; Wed, 29 Jun 2005 00:27:59 -0400 Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id AAA01696 for ; Wed, 29 Jun 2005 00:27:55 -0400 (EDT) Received: from szxga03-in.huawei.com ([61.144.161.55] helo=huawei.com) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1DnUaU-0006CO-CQ for rtg-bfd@ietf.org; Wed, 29 Jun 2005 00:54:19 -0400 Received: from huawei.com (szxga03-in [172.24.2.9]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0IIT00623WBFMZ@szxga03-in.huawei.com> for rtg-bfd@ietf.org; Wed, 29 Jun 2005 12:26:03 +0800 (CST) Received: from szxml02-in ([172.24.1.6]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0IIT00292WBFYB@szxga03-in.huawei.com> for rtg-bfd@ietf.org; Wed, 29 Jun 2005 12:26:03 +0800 (CST) Received: from z11024 ([10.110.100.95]) by szxml02-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTPA id <0IIT00G3NWG9OO@szxml02-in.huawei.com>; Wed, 29 Jun 2005 12:28:58 +0800 (CST) Date: Wed, 29 Jun 2005 12:23:48 +0800 From: zhaisuping To: Carlos Garcia Braschi Message-id: <0IIT00G3OWGAOO@szxml02-in.huawei.com> Organization: huawei MIME-version: 1.0 X-Mailer: Foxmail 4.2 [cn] Content-type: text/plain; charset=GB2312 Content-transfer-encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Scan-Signature: 156eddb66af16eef49a76ae923b15b92 Content-Transfer-Encoding: quoted-printable Cc: "rtg-bfd@ietf.org" Subject: Re: Re: bfd application with BGP and static routes draft submission X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: zhaisuping@huawei.com List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: rtg-bfd-bounces@ietf.org Errors-To: rtg-bfd-bounces@ietf.org At first thank you very much for your carefully reading the= draft. See my response inline please,marked with[suping]. >2005/6/23, rtg-bfd-request@ietf.org : >> >> Message: 2 >> Date: Thu, 23 Jun 2005 19:18:33 +0800 >> From: zhaisuping >> Subject: bfd application with BGP and static routes draft= submission >> To: "internet-drafts@ietf.org" >> Cc: "rtg-bfd@ietf.org" , = "jhaas@nexthop.com" >> , "dward@cisco.com"= , >> "dkatz@juniper.net" >> Message-ID: <0IIJ00598BSE5U@szxml01-in.huawei.com> >> Content-Type: text/plain; charset=3D"gb2312" >> >> I am sorry that I don't attatch the file in the last mail, so= I send the mail again. Sorry for the mistake. >> >> Dear all, >> I have written a draft about BFD application with BGP and= static routes, the purpose is to resolve the BFD bootstrapping= end encapsulation problem when in applications. It's 6 pages= long, Comments are very welcome. >> >> Please help to post to the IETF website this draft and thank= you for that. >> >> Thank you and Best regards.=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1 >> >> Best Regards, >> zhaisuping@huawei.com >> Huawei Technologies Co., Ltd. >> Tel: +86-10-82882867 >> Fax: +86-10-82882537 >> 2005-06-23 >> > >My comments: > >Should this draft be extended to the use of BFD for BGP in a= multi-hop >environment? >It seems that the changes needed for BGP in a multi-hop= environment >would be that demultiplexing should be based either on BGP= signalling >or on the source/destination address pairs and that= Authentication >SHOULD be used (as specified in the multi-hop draft). [suping] For BGP I think the usually application is one-hop, so= do we nessesarily need the multi-hop BGP? > >Could this draft be extended to the use of BFD for RIP? This= would >complete the application of BFD to the most common routing= protocols >in use today, as OSPF and IS-IS are covered in the 1Hop draft. [suping] I am very happy to do that. > >As RIPv2 is mostly a protocol frozen in time, demultiplexing= methods >would only be manual configuration and demultiplexing based on >source/destination address pairs. ICMP and LSP-ping would not= apply, >as reasoned below for static routes. >Also, because of this "frozennes", no possibility exists to= negotiate >the discriminator value inside the protocol. >So, for this protocol, as in BGP, it should be OPTIONAL not to= put the >routes from RIP into the routing table until the BFD session is >established. In this case the behaviour could also be not to= require >any peer to behave differently from standard RIP until the= first >session is established. [suping]I agree with you. > >Although I'm not sure it is a good idea to use ICMP to achieve >demultiplexing, I think the section 3.1.1 is somewhat= incomplete, as >it should define the ICMP type and code values (as TBD,= perhaps), and >be extended to ICMPv6. I wouldn't do it, anyway. [suping]I think ICMP is a optional ways to demultipelexing BFD= session. In fact in ICMP(V4), there are message types of 15 (Information= Request) and 16 (Information Reply), my intent is to extend the existing= message by adding BFD discrimator in it. As for ICMPv6, I think there should be some new message type(TBD)= for this purpose. > >I'm also unsure what scenario could have a static route needing= BFD >and have MPLS so that it has the LSP-ping mechanism to bootstrap= the >session (3.1.2). If you have MPLS, you certainly could apply BFD= for >MPLS and then you don't need BFD for this static route. [suping]Yes, I think you are right. If MPLS is supported we could= use BFD for MPLS and don't need BFD for the static route. In anoter word,= when static route we think that no MPLS is supported. So I will make such= clarification in the draft. > >I'm certainly overlooking something on 2.2 and 3.2, why would= one want >to put a random address from 127/8 in the destination address= instead >of the IP address of the peer or the static route points to? >In BGP, we already know the destination address, why shouldn't= it be used? > >For static routes on a LAN environment, where that address must= be >known in order to get its MAC address, the same reasoning= applies. I >see the applicability to point-to-point environments, but there >Inverse ARP could be used to get the other side's IP address. >But in any case, probably a rationale for the decision wouldn't= harm. [suping]Yes, I think you are right again:) We can use explicity= destination IP address in BGP and static route applications because the DIP has been= known. > >It would be a good thing if there were some mechanism so that= manual >configuration does not need to configure a specific value for= the My >discriminator... =A2=AFPerhaps restricting demultiplexing in the= presence >of a zero value for the My discriminator to one session per >source/destination address pair? [suping]So in implementation a more situation must be considered= if this is the criteria, and even more if more BFD sessions are needed,= demultiplexing also needed not according to source/destination address pair.=A2=AF >Perhaps using the source port >address for demuliplexing? [suping] There should be scenarios that more BFD sessions in one= source port, so I don't think this will apply. > >Regards, >Carlos. >-- >Telefonica Empresas