From: Lupi, Guy (Guy.Lupi@xxxxxxxxxxxxx)
Date: Sat Apr 27 2002 - 12:06:34 GMT-3
I believe it is only mandatory that the ID's be the same if you have bgp
synchronization enabled, and the neighbor from which you recieve the ibgp
route is the same neighbor from which you receive the OSPF route that syncs
them. In that case the OSPF and BGP router id of the neighbor must be the
same. I'm sure someone will clarify if I am inaccurate here, from CCO:
Paths marked as "not synchronized" in the show ip bgp <longer-prefixes>
output. If BGP synchronization is enabled, which it is by default in Cisco
IOS. Software, there must be a match for the prefix in the IP routing table
in order for an internal (iBGP) path to be considered a valid path. If the
matching route is learned from an OSPF neighbor, its OSPF router ID must
match the BGP router ID of the iBGP neighbor. Most users prefer to disable
synchronization using the no synchronization BGP subcommand.
http://www.cisco.com/warp/public/459/25.shtml
~-----Original Message-----
~From: Curtis Phillips [mailto:cphillips@blazenet.net]
~Sent: Saturday, April 27, 2002 8:08 AM
~To: ccielab@groupstudy.com
~Subject: The rules about setting ROUTER IDs
~
~
~Hello,
~
~Can someone describe briefly the issues with using the
~router-id commands in
~OSPF and BGP. There was some talk in the past about sync
~issues between the
~protocols.
~
~Is it mandatory to use the same ID for both protocols?
~If so, under what circumstance?
~
~Any help understanding is appreciated.
~
~Regards,
~
~Curtis
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