From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Tue Jun 12 2007 - 16:08:10 ART
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 > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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