An engineer is designing a BGP network for a large customer. To permit efficient scaling, the BGP domain is split into clusters. Which peering solution should be used between the route reflectors in…

Question

Options

• AThe route reflectors should be made dents of each other.
• BThe route reflectors should be nonclients with regards to each other.
• CThe route reflectors should not have any kind of BGP peering.
• DThe route reflectors should have peering through another nonclient router.

• A
  3% (1)
• B
  89% (31)
• C
  3% (1)
• D
  6% (2)

Explanation

In a BGP design with multiple route reflector (RR) clusters, inter-cluster communication requires that the RRs peer with each other as nonclient iBGP peers (i.e., regular iBGP neighbors, not as clients of one another). When an RR receives a route from a client, it reflects it to all nonclient peers and other clients. If the inter-cluster RRs were clients of each other, the CLUSTER_LIST loop-prevention mechanism could block proper propagation and introduce routing anomalies. By peering as nonclients, each RR treats the other as a standard iBGP neighbor and correctly re-advertises routes learned from its own cluster, ensuring full BGP route propagation across all clusters. No peering at all (C) would break inter-cluster reachability, and routing through an intermediate nonclient (D) is unnecessarily complex and not the standard design.

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