Refer to the exhibit. Routers within the cluster are not receiving the desired prefixes. What must be done to fix the issue?

Question

Options

• AClients in that cluster must have full mesh connectivity between eBGP peers.
• BNo client-to-client must be disabled.
• CClients in that cluster must have full mesh connectivity between iBGP peers.
• DNo client-to-client reflection must be enabled.

• A
  5% (3)
• B
  3% (2)
• C
  79% (49)
• D
  13% (8)

Explanation

By default, a BGP Route Reflector (RR) reflects routes between its clients (client-to-client reflection is enabled by default). However, if 'no bgp client-to-client reflection' has been configured on the RR, the RR will no longer reflect routes from one client to other clients in the same cluster. In this scenario, clients lose the benefit of the RR relaying their routes to peers, so they are not receiving desired prefixes from other clients. The fix is to establish full-mesh IBGP connectivity between all clients in the cluster so they can exchange routes directly without relying on the RR for intra-cluster reflection. A is incorrect - full mesh eBGP is irrelevant here since these are IBGP peers. B is incorrect - disabling client-to-client reflection is what caused the problem. D is incorrect - the fix is to add full-mesh iBGP between clients, not to re-enable client-to-client reflection (though re-enabling it would also fix it, that is option D's wording which says 'must be enabled' implying it isn't - but C more directly fixes the described symptom).

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