BGP Notes – Route Reflectors

  • Route reflectors remove the requirement of having a full mesh iBGP network.
  • Any iBGP route a router reflector learns is sent to all route reflector clients.
    • Non-client iBGP neighbors do not get the new route per iBGP rules.
  • RR clients are configured like normal iBGP routers.
    • All RR client config is done on the route reflector.
  • RRs and clients are part of a cluster.
    • RRs in each cluster must be neighbors with each other.
    • Each cluster RR appends the cluster ID to the CLUSTER_ID PA; this is used similarly to AS_CONFED_SEQ.
  • The ORIGINATOR_ID PA is set by and preserved by the RR.
    • If a route contains the ORIGINATOR_ID of the receiving router, the update is ignored.
  • Only best routes are passed to RR clients and non-client neighbors.

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Aaron Conaway

I shake my head around sometimes and see what falls out. That's what lands on these pages. If you have any questions, the best way to contact me is through Twitter at @aconaway.

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