300-320 Question #587: Real Exam Question with Answer & Explanation

The correct answer is A: 10. In a Route Reflector (RR) design, clients do not peer with each other - they only peer with their assigned RR(s). With 2 RRs and 5 clients, each client peers with both RRs for redundancy: 5 clients × 2 RRs = 10 sessions. The RR-to-RR peering is considered a separate backbone sess

Question

2 RR and 5 Clients in 65000AS - how much BGP sessions do you need for full mesh?

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Explanation

In a Route Reflector (RR) design, clients do not peer with each other - they only peer with their assigned RR(s). With 2 RRs and 5 clients, each client peers with both RRs for redundancy: 5 clients × 2 RRs = 10 sessions. The RR-to-RR peering is considered a separate backbone session (or the two RRs are in the same cluster). Compare this to a full mesh of 7 routers (2+5) which would require 7×6/2 = 21 sessions - RR design dramatically reduces this overhead.

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