From: Filyurin, Yan (yan.filyurin@eds.com)
Date: Tue Jun 12 2007 - 16:54:37 ART
It sure is, but I have seen a couple of scenarios where it had to be
enabled, so I'll have to revisit them. I did see the URLs and the
information definitely helps. I am more clear on the issue now. Thank
you everyone!
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ronnie Angello
Sent: Tuesday, June 12, 2007 3:44 PM
To: ccielab@groupstudy.com
Subject: Re: OSPF router id and BGP router id
BGP sync is disabled by default in 12.2(8)T and later.
On 6/12/07, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> If BGP synchronization is enabled, there must be a match for the
prefix in
> the IP routing table in order for an internal BGP (iBGP) path to be
> considered a valid path. BGP synchronization is enabled by default in
> Cisco
> IOS. Software. If the matching route is learned from an Open Shortest
Path
> First (OSPF) neighbor, its OSPF router ID must match the BGP router ID
of
> the iBGP neighbor. Most users prefer to disable synchronization with
use
> of
> the no synchronization BGP subcommand.
>
> http://www.cisco.com/warp/public/459/25.shtml#background
>
> --
>
> Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
>
>
> On 6/12/07 11:54 AM, "Filyurin, Yan" <yan.filyurin@eds.com> wrote:
>
> > Hello Group Study. I have heard of issue that occassionally happens
> > with mismatch of BGP router id and OSPF router id. From what I
> > understand based on some research it only happens when
synchronization
> > is enabled and you peer either single hop or multihop. And I've
heard
> > the problem is very famous and has been undoing of many CCIE
candidates.
> > I've never ran into anything like that during my practice labs or in
> > real life, so was wondering if I could find out more.
> >
> > Thank you
> >
> >
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