Re: Update to OSPF Hello procedure[draft-kou-ospf-immediately-replying-hello-00.txt]
Zengjie Kou <kouzengjie@HUAWEI.COM> Sat, 31 December 2005 08:29 UTC
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1Esc7T-0000i9-5o for ospf-archive@megatron.ietf.org; Sat, 31 Dec 2005 03:29:43 -0500
Received: from wildebeest.ease.lsoft.com (wildebeest.ease.lsoft.com [209.119.0.21]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id DAA14991 for <ospf-archive@LISTS.IETF.ORG>; Sat, 31 Dec 2005 03:28:29 -0500 (EST)
Received: from PEACH.EASE.LSOFT.COM (lists.state.gov) by wildebeest.ease.lsoft.com (LSMTP for Windows NT v1.1b) with SMTP id <12.00007FBE@wildebeest.ease.lsoft.com>; Sat, 31 Dec 2005 3:29:10 -0500
Received: by PEACH.EASE.LSOFT.COM (LISTSERV-TCP/IP release 14.4) with spool id 95113179 for OSPF@PEACH.EASE.LSOFT.COM; Sat, 31 Dec 2005 03:29:09 -0500
Received: from 61.144.161.53 by WALNUT.EASE.LSOFT.COM (SMTPL release 1.0m) with TCP; Sat, 31 Dec 2005 03:29:09 -0500
Received: from huawei.com (szxga01-in [172.24.2.3]) by szxga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0ISC00L5NTBCBW@szxga01-in.huawei.com> for OSPF@PEACH.EASE.LSOFT.COM; Sat, 31 Dec 2005 16:38:01 +0800 (CST)
Received: from szxml02-in ([172.24.1.6]) by szxga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTP id <0ISC00HHWTBCCO@szxga01-in.huawei.com> for OSPF@PEACH.EASE.LSOFT.COM; Sat, 31 Dec 2005 16:38:00 +0800 (CST)
Received: from k49110 ([10.111.12.97]) by szxml02-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 1.25 (built Mar 3 2004)) with ESMTPA id <0ISC00F3LTEIVT@szxml02-in.huawei.com> for OSPF@PEACH.EASE.LSOFT.COM; Sat, 31 Dec 2005 16:39:54 +0800 (CST)
MIME-version: 1.0
X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180
X-Mailer: Microsoft Outlook Express 6.00.2900.2180
Content-type: text/plain; charset="iso-8859-2"
Content-transfer-encoding: 7bit
X-Priority: 3
X-MSMail-priority: Normal
References: <20051229112742.71966.qmail@web25401.mail.ukl.yahoo.com> <006001c60cea$56c85d10$610c6f0a@china.huawei.com> <43B4B2F9.60A807AB@earthlink.net>
Message-ID: <002301c60de4$4074d160$610c6f0a@china.huawei.com>
Date: Sat, 31 Dec 2005 16:29:00 +0800
Reply-To: Mailing List <OSPF@PEACH.EASE.LSOFT.COM>
Sender: Mailing List <OSPF@PEACH.EASE.LSOFT.COM>
From: Zengjie Kou <kouzengjie@HUAWEI.COM>
Subject: Re: Update to OSPF Hello procedure[draft-kou-ospf-immediately-replying-hello-00.txt]
To: OSPF@PEACH.EASE.LSOFT.COM
Precedence: list
List-Help: <http://peach.ease.lsoft.com/scripts/wa.exe?LIST=OSPF>, <mailto:LISTSERV@PEACH.EASE.LSOFT.COM?body=INFO+OSPF>
List-Unsubscribe: <mailto:OSPF-unsubscribe-request@PEACH.EASE.LSOFT.COM>
List-Subscribe: <mailto:OSPF-subscribe-request@PEACH.EASE.LSOFT.COM>
List-Owner: <mailto:OSPF-request@PEACH.EASE.LSOFT.COM>
List-Archive: <http://peach.ease.lsoft.com/scripts/wa.exe?LIST=OSPF>
Content-Transfer-Encoding: 7bit
Hi,Mitchell Please see inline for answers to your questions. ----- Original Message ----- From: "Erblichs" <erblichs@EARTHLINK.NET> To: <OSPF@PEACH.EASE.LSOFT.COM> Sent: Friday, December 30, 2005 12:09 PM Subject: Re: Update to OSPF Hello procedure[draft-kou-ospf-immediately-replying-hello-00.txt] > Kou, > > 1) A few extra hellos? You will force a matrix number > of hellos? With 10 routers, you will need 90 hellos. > With 100 routers, we have 9900 hellos I think, if > we need to respond to each nbr's hello. Where we have > 2x the number of router's hellos in the standard method > with MC hellos (20 and 200). Oh, yours are with ms of > each other and the standard hellos are spread along the > hello interval. > 1.) Immediate Hello can be enable or disable. 2.) On broadcast and NBMA networks, Immediate Hello expedite link recovery when a link goes down then up and does bring a few extra hellos(with 10 routers, will need 27(9*3) hellos ). At the moment of router booting, the Immediate Hello is not fit. So, we can disable it. > 2) > I disagree, this can effect DR election. > > How? Assume their is a disagreement as to whom > should be elected DR in the normal method. Now, with > that quick hello, the faster router tells the other > routers not just whom he choose, but who is the DR. > > Anytime before DR is elected, Y informs that X is the DR, > then OSPF says X is the DR. You are saving on avg > 1/2 hello interval time. > > Now, why can their be a disagreement? Simply, a late > hello informing about a new router with a higher priority > before the DR is elected. > > With the current method, we give an extra few secs, just > to allow everyone to make up their own private decision, then > publicise the decision, and if their is a disagreement after > recieving the multiple public hellos, then resolve it. > > Yes, some implimentations ignore hellos with DR announcement > after election has begun. But some don't. And I am refering > to the later ones. > > Now, it gets complicated. Assume that 2 routers who accept > the fast hello and the interruption of the DR process. Won't > they form a full ADJ if one or both are the DR / BDR? Now, > the 3rd guy heard a hello from the highest priority router > and accepted him as the DR? Aren't you needlessly trying > to sync the LSDBs with the wrong DR? > > Mitchell Erblich > > > Sorry, I don't know what is your question. 1)Why is DR election interrupted? Why is DR election wrong? With two routers, one is DR, another is BDR, their hello packets include DR/BDR information. Thanks Kou. > Zengjie Kou wrote: >> >> Hi,Manav >> I don't find any harm except a few additional hello packets before the state reaches "ExStart". >> >> The Immediate Hello do not affect which router will be elected DR. It only expedite the election. >> >> thanks >> kou. >> >> ----- Original Message ----- >> From: "Manav Bhatia" <manav_bhatia06@YAHOO.CO.UK> >> To: <OSPF@PEACH.EASE.LSOFT.COM> >> Sent: Thursday, December 29, 2005 7:27 PM >> Subject: Re: Update to OSPF Hello procedure[draft-kou-ospf-immediately-replying-hello-00.txt] >> >> > So whats the harm in this? >> > >> > If you wanted a particular router to become the DR then you would have given it a higher priority. >> > The fact that you havent done that implies that you dont really care which router becomes the DR. >> > >> > Manav >> > --- Nitin Kakkar <nitink@HUAWEI.COM> wrote: >> > >> >> Suppose there are n routers on a Link and all of them come up almost >> >> simultaneously. >> >> >> >> Seems like the routers which were fractionally faster to send hello will be >> >> picked for DR/BDR election !!! >> >> >> >> >> >> >> >> May be you can think of immediately replying to hello packet "Only when DR >> >> is already elected on the link". >> >> >> >> >> >> >> >> Rgds >> >> >> >> Nitin >> >> >> >> >> >> >> >> -----Original Message----- >> >> From: Mailing List [mailto:OSPF@PEACH.EASE.LSOFT.COM] On Behalf Of >> >> Kouzengjie >> >> Sent: Thursday, December 29, 2005 7:51 AM >> >> To: OSPF@PEACH.EASE.LSOFT.COM >> >> Subject: Update to OSPF Hello >> >> procedure[draft-kou-ospf-immediately-replying-hello-00.txt] >> >> >> >> >> >> >> >> A New Internet-Draft is available from the on-line Internet-Drafts >> >> directories. >> >> The draft can be found here: >> >> http://www.ietf.org/internet-drafts/draft-kou-ospf-immediately-replying-hell >> >> o-00.txt >> >> >> >> >> >> >> >> This memo documents an extension of the OSPF protocol to reach >> >> "ExStart" state more quickly. Currently, the OSPF behavior requires >> >> the Hello Packet to be sent between the neighbors every >> >> HelloInterval. This document proposes to generalize the use of >> >> Immediately Replying Hello which could reduce the time required to >> >> reach the OSPF "ExStart" state and expedite the routing table >> >> convergence. >> >> >> >> >> > >> > >> > >> > >> > ___________________________________________________________ >> > NEW Yahoo! Cars - sell your car and browse thousands of new and used cars online! http://uk.cars.yahoo.com/
- Update to OSPF Hello procedure[draft-kou-ospf-imm… Kouzengjie
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Vishwas Manral
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Nitin Kakkar
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Manav Bhatia
- Re: Update to OSPF Hello procedure[draft-kou-ospf… sujay
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Vishwas Manral
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Erblichs
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Zengjie Kou
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Zengjie Kou
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Zengjie Kou
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Don Goodspeed
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Erblichs
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Vishwas Manral
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Nitin Kakkar
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Zengjie Kou
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Zengjie Kou
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Paul Jakma
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Paul Jakma
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Erblichs
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Zengjie Kou
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Zengjie Kou
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Paul Jakma
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Paul Jakma
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Erblichs
- Re: Update to OSPF Hello procedure[draft-kou-ospf… Erblichs