Question about route reflector operation. It appears that a RR, when provided with multiple routes to the same destination, will pick the best path and then reflect this best path to the appropriate set of clients and non-clients.
I had expected that the RR would simply just reflect routes and not perform route selection on behalf of clients. While this does have benefits to lower-end RR clients, I'm curious as to how step 8 of the BGP decision process is made. Step 8 is where an iBGP router, for a set of equal routes, will compute the IGP cost to the route's next-hop, and select the path whose next-hop is IGP closest. How is this step performed by the RR? Does the RR compute the IGP cost from itself to the next-hop, or does it attempt to compute the IGP cost from each client to the next-hop? I get the impression that it is the former (RR to nexthop). If this is correct, then might one expect sub-optimal BGP routes selection at times as the cost is from the RR to the next-hop and not the real cost from an iBGP client to the next-hop? Much like aggregation, some sub-optimalities might be the price paid to scale. Just trying to verify how path selection is handled when RR's are present. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=61900&t=61900 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
