Thanks for that one more question....for example if we have four routers a,b,c,d and we want to make a and d as rr (keeping in mind all are using peer groups internal....so if we want redun we can add these two routers in one cluster id right??? now on router a we will issue command that neigbor internal route-refelctor client....now my question is that router d is configured as a neigbor internal peer group.....and by issuing command it will become RR client as well while on router d same is config for router a....now we put them in cluster ??? who will become rr or both will work as a RR...i am bit confuse abt this concept.....cheers

For both routers to be part of the same cluster, they need to share the same cluster id. By default, the RID becomes the cluster id. Since the RID should be different on each router, you need to manually configure the cluster id using the command "bgp cluster-id" if you want the two routers to share the same router id. Both RRs will be active at the same time whether they are in the same cluster or not.

BTW, the two RRs do not necessarily need to be part of the same cluster to work appropriately and they would work just fine if they were not (i.e. cluster id equal to the RID).

Regards

Sorry, I meant "if you want the two routers to share the same cluster id" not router id.

Regards