From: Ronnie Angello (ronnie.angello@gmail.com)
Date: Tue Jun 12 2007 - 18:53:08 ART
Yes, it's definitely a useful document. I just wanted to clear up the
discrepency since the document mentions that sync is enabled by default and
then it later says that it's disabled by default in 12.2(8)T and later. You
just happened to quote the part that's outdated...no disrespect intended.
On 6/12/07, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> 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 Although the link is a little out of date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
> >>>
> >>>
> _______________________________________________________________________
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> >>> http://www.groupstudy.com/list/CCIELab.html
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >
> >
>
>
-- Ronald Angello CCIE #17846
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