350-601 Question #291: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. During a vPC peer switch reload, there is packet loss between the server and the router. Which action must be taken to prevent this behavior during future reloads?

Options

• ASet the routed uplink ports of the Cisco Nexus peers as orphans.
• BIncrease the vPC delay restore timer.
• CDisable vPC ARP synchronize on the vPC peers.
• DDecrease the OSPF hello and dead interval timers.

Explanation

After a vPC peer device reloads and comes back up, the routing protocol needs time to The recovering vPCs leg may black-hole routed traffic from access to core until Layer 3 connectivity is reestablished. vPC Delay Restore feature delays vPCs leg bringup on the recovering vPC peer device. vPC Delay Restore allows for Layer 3 routing protocols to converge before allowing any traffic on vPC Result is a more graceful restoration and zero packet loss during the recovery phase (traffic still get diverted on the alive vPC peer device). This feature is enabled by default with a vPC restoration default timer of 30 seconds. The timer can be tuned according to a specific Layer 3 convergence baseline from 1 to 3600 seconds. practices_design_guide.pdf

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