Designing Cisco Data Center Infrastructure (DCID) — Question 112

An engineer configured the OSPF protocol in the vPC topology. During the catastrophic failure of one of the vPC member switches, the traffic was routed to a black hole. This route was caused by the long convergence time caused by the delay of the vPC member switch reboot. After the failure, the engineer rebooted both switches, but the secondary switch powered on before the primary one. It caused all the vPCs to be shut down due to consistency-check violations.

Which two features must be used to prevent these situations from happening in the future? (Choose two.)

Answer options

• A. peer-gateway
• B. ip arp synchronize
• C. delay restore
• D. auto-recovery
• E. system priority

Correct answer: C, D

Explanation

The correct answers are C and D because 'delay restore' helps manage the timing of switch reboots to prevent inconsistencies, while 'auto-recovery' enables automatic restoration of vPCs after a failure. Options A, B, and E do not directly address the timing and consistency issues that arise during the failure and recovery of vPC member switches.