Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 523

Which control plane process allows the MPLS forwarding state to recover when a secondary RP takes over from a failed primary RP?

Answer options

• A. LDP uses SSO to recover from disruption in control plane service.
• B. MP-BGP uses control plane services for label prefix bindings in the MPLS forwarding table.
• C. FEC uses a control plane service to distribute information between primary and secondary processors.
• D. LSP uses NSF to recover from disruption in control plane service.

Correct answer: A

Explanation

The correct answer, A, highlights how LDP (Label Distribution Protocol) uses Stateful Switchover (SSO) to maintain MPLS operations during a control plane disruption. Other options describe different protocols or mechanisms that do not specifically address the recovery of the MPLS forwarding state when transitioning from a primary to a secondary RP.