From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Mon Feb 11 2002 - 04:54:13 GMT-3
Your BGP and your OSPF router id should match. There is an issue with OSPF
and BGP when synchronization is left on. If you learn a route from an iBGP
neighbor, and are trying to synchronize this route with OSPF, the RID of the
router advertising the BGP and the OSPF route must match. For example, if
you have:
R1---R2---R3
R1 advertises route x.x.x.x via iBGP to R2, and R3 advertises route x.x.x.x
via OSPF to R2. Even though R2 has an IGP route to this BGP network, the
route is not synchronized. One possible workaround to this issue would be
to set R1's BGP RID to R3's OSPF RID, but this solution is a stretch. Just
be sure to hard code your BGP & OSPF RIDs the same, and force your routes to
be advertised in such a way that both the OSPF and BGP advertisement come
from the same router.
This doc describes the issue: http://www.cisco.com/warp/public/459/25.shtml
Brian McGahan
CCIE #8593
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
----- Original Message -----
From: "Shadi" <ccie@investorsgrp.com>
To: "ccielab" <ccielab@groupstudy.com>
Sent: Saturday, February 09, 2002 2:34 AM
Subject: When Router ID can effect the Router operation?
> Guys,
>
> When Router ID can effect the router Configuration?
>
> In OSPF we depened in Router ID in virtual links Configuration, what else,
> does Router-ID effect the BGP too?
>
> I know it looks like a silly question but it is very important espcailly
in
> the CCIE exam?
>
> Shadi
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