From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Tue Jun 12 2007 - 17:58:40 ART
We're all aware (or should be) of synchronization being disable now. The
quote is from the link I sent. Although the link is a little out of date
the information is still useful in regards to BGP/OSPF router ID issues.
--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 12:43 PM, "Ronnie Angello" <ronnie.angello@gmail.com> wrote:
> 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 >>> >>> _______________________________________________________________________ >>> Subscription information may be found at: >>> http://www.groupstudy.com/list/CCIELab.html >> >> _______________________________________________________________________ >> Subscription information may be found at: >> http://www.groupstudy.com/list/CCIELab.html
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