From: Banks, Ethan (Ethan.Banks@ChasePaymentech.com)
Date: Thu Jan 10 2008 - 09:56:55 ARST
Nate, I have one thought, maybe others will have more. It's an issue
where changing the OSPF RID might impact BGP.
There is a situation that can arise with BGP synchronization that can
prevent a prefix from being advertised by the BGP speaker. If the IGP
is OSPF, the router ID (RID) of the autonomous system boundary router
(ASBR) must equal the RID of the IBGP speaker advertising that route. If
the RIDs are mismatched, then BGP assumes synchronization is broken, and
the route will not be advertised to a BGP neighbor.
This article describes the issue clearly.
http://www.netmasterclass.net/site/articles/BGP%20Route%20Reflector%20an
d%20synchronization%20rule.pdf
/Ethan
|-----Original Message-----
|From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
|Behalf Of Cielieska Nathan
|Sent: Wednesday, January 09, 2008 5:01 PM
|To: Cisco certification
|Subject: Router-id Harmful?
|
|All,
|In OSPF, DR/BDR Election removed.. is there ever a reason not to
|manipulate the router-id? I am moving through Labs but i find it
|cleaner to change the router-id on every router i touch to make
|things mentally "cleaner". I can also see it buying you some time on
|the Big Lab especially with Virtual Links.
|
|Again, if you account for the DR/BDR Election, is there a reason to
|not chronically change the router-id's?
|
|Regards,
|Nate
|
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