From: Michael Snyder (msnyder@xxxxxxxxxxxxxxxxxxxxxx)
Date: Thu Aug 22 2002 - 11:02:22 GMT-3
When you are using RR's back to back, do you set the cluster ID to the
same value so the RR's know they are working within the same cluster?
Or different values so each RR can keep it's routes separate from the
other RR?
I am leaning to former, and not the later. That cluster id's should be
the same on back to back RR's. Note, when I first read about the
command, I thought it was the other way around.
Is there any time that two RR's should have different cluster ID's?
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Usage Guidelines
Together, a route reflector and its clients form a cluster.
Usually a cluster of clients will have a single route reflector. In that
case, the cluster is identified by the router ID of the route reflector.
In order to increase redundancy and avoid a single point of failure, a
cluster might have more than one route reflector. In this case, all
route reflectors in the cluster must be configured with the 4-byte
cluster ID so that a route reflector can recognize updates from route
reflectors in the same cluster.
If the cluster has more than one route reflector, use this command to
configure the cluster ID.
Examples
In the following example, the local router is one of the route
reflectors serving the cluster. It is configured with the cluster ID to
identify the cluster.
router bgp 5
neighbor 198.92.70.24 route-reflector-client
bgp cluster-id 50000
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