From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Wed Apr 28 2004 - 15:45:55 GMT-3
At 2:27 PM -0400 4/28/04, Peter van Oene wrote:
>The short answer is that this is an @#$@'ing ridiculous scenario
>that is a complete waste of your time. If Cisco wants to test on
>it, then shame on them for forcing you to study such a moronic
>topic. There is nothing anywhere near a practical requirement for
>such a topology and synchronization is years more outdated than many
>of the already deprecated items that have found space on the CCIE
>lab.
Peter, you are going to have to learn that holding in emotions isn't
the same as hiding internal routes. ;-)
That said, I am in complete agreement. Perhaps it's worth pointing
out some of the historic context in which synchronization was
introduced. It was assumed, in a transit AS, that there were very
few routers that spoke BGP, as opposed to today's service provider
topologies are generally BGP-everywhere. The main exception would be
primarily MPLS routers in the core, which really are providing
tunnels to the BGP speakers.
There also was a historic observation that the IGP would carry all
routes. People may have noticed there's an OSPF LSA, Type 8 "database
overflow", that no one seems to use. It was meant for this purpose.
In _OSPF: Anatomy of an Internet Routing Protocol_, John Moy
discusses the Type 8, observed it was never used in a production
implementation, and has been superceded by iBGP.
>
>
>
>At 12:39 PM 4/28/2004, Edwards, Andrew M wrote:
>>I'm trying to understand methods to keep synchronization on in BGP and
>>provide BGP to OSPF redistribution with route reflectors.
>>
>>You know the problem where the route reflector server receives an update
>>from a route reflector client that is redistributing BGP to OSPF.
>>
>>When the route reflector server gets the update, it reflects that update
>>to all other RR clients but changes the BGP ID to itself.
>>
>>Obviously the other BGP RR clients get the BGP update but the OSPF
>>router ID and BGP ID do not match on the clients so the BGP route is not
>>marked
>>As a best path ">"
>>
>>So the question I have is what methods are available to make this work
>>with synchronization on and using route reflectors?
>>
>>Is the answer go to full mesh or transfer to confederations?
>>
>>I'm stumped on how to change the BGP router-id to the originators BGP
>>router ID on the RR server.
>>
>>Thanks for the input... or clearing up my confusion.
>>
>>Andy
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