CCDE: Cisco Certified Design Expert (Written) — Question 31

What is the most effective way to improve BGP convergence in the event that a point-to-point link, over which an EBGP session is running, fails?

Answer options

• A. reduce the keepalive timer to the minimum value allowed
• B. configure EBGP fast external fallover
• C. use BGP multihop
• D. enable BGP graceful restart

Correct answer: B

Explanation

The correct answer, B, is effective because EBGP fast external failover allows for quicker detection and response to link failures, enhancing convergence. Option A would reduce the time between keepalives but does not address the actual failure detection as effectively as option B. Option C, BGP multihop, is not relevant to point-to-point link failures, and option D, BGP graceful restart, is helpful for maintaining sessions during a restart but does not improve the speed of convergence when a link fails.