300-415 · Question #223
300-415 Question #223: Real Exam Question with Answer & Explanation
The correct answer is A: omp no shutdown graceful-restart timers holdtime 120. To ensure WAN Edge routing tables are refreshed within 2 minutes after a vSmart connection is restored, the OMP graceful-restart holdtime must be configured to 120 seconds. This specifies how long a WAN Edge will retain routes learned from a vSmart during a temporary control plan
Question
Options
- Aomp no shutdown graceful-restart timers holdtime 120
- Bomp no shutdown graceful-restart timers advertisement-interval 120
- Comp no shutdown no graceful-restart
- Domp no shutdown graceful-restart timers eor-timer 120
Explanation
To ensure WAN Edge routing tables are refreshed within 2 minutes after a vSmart connection is restored, the OMP graceful-restart holdtime must be configured to 120 seconds. This specifies how long a WAN Edge will retain routes learned from a vSmart during a temporary control plane outage.
Common mistakes.
- B. The 'advertisement-interval' timer controls how often OMP updates are sent, not how long routes are held during a graceful restart scenario.
- C. Disabling graceful restart ('no graceful-restart') would cause routes to be flushed immediately upon vSmart adjacency loss, exacerbating the problem of dropped traffic during unstable connections, not solving it.
- D. The 'eor-timer' (End-of-Rib timer) is related to the time a router waits to receive all routes from a peer after establishing an adjacency, not for holding routes during an outage.
Concept tested. OMP Graceful Restart Hold Time
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