350-601: Implementing and Operating Cisco Data Center Core TechnologiesDemo

By Cisco · Question Mode

QuestionQ448

Network

Following a Cisco Nexus 7000 Series Switch chassis replacement, an administrator finds that all vPC-enabled LACP port channels have reinitialized. The administrator wants to avoid this issue during the next chassis replacement. Which two actions must be completed before the isolated device is reloaded?

Choose two
  • A Change the vPC system-priority of the replacement chassis to a higher value than the peer
  • B Set the vPC MAC address to a higher value than the peer
  • C Configure auto-recovery to the disable state on both peers
  • D Set the vPC MAC address to a lower value than the peer
  • E Change the vPC system-priority of the replacement chassis to a lower value than the peer
Explanation

When a vPC peer chassis is replaced, the new supervisor comes up with default vPC settings, so before it is reloaded and rejoins the peer link, the administrator must raise its vPC system-priority value (a higher numeric value is a worse/lower priority) above that of the surviving peer so the replacement cannot win a role re-election and force the vPC domain to reconverge; simultaneously, auto-recovery must be disabled on both peers so that the surviving switch does not treat the temporary peer-link/keepalive loss as a full peer failure and independently bring the vPC member ports back up, which is what causes the LACP port channels to reinitialize. Re-enabling auto-recovery is done only after the replacement chassis has fully rejoined the vPC domain.

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