300-415 Question #205: Real Exam Question with Answer & Explanation

The correct answer is A: graceful restart timer. The graceful restart timer specifies the duration for which a WAN Edge router retains its learned OMP routing information in its cache and forwarding table after all OMP sessions are lost.

WAN Edge Router Deployment

Question

Which timer specifies how long the router keeps routing information in the cache after all OMP sessions are lost at location S4317T8E35F76?

Options

Agraceful restart timer
Badvertisement interval
CEOR timer
Dhold time

Explanation

The graceful restart timer specifies the duration for which a WAN Edge router retains its learned OMP routing information in its cache and forwarding table after all OMP sessions are lost.

Common mistakes.

B. The advertisement interval timer determines how frequently OMP routes are sent to the vSmart controller, not how long cached routes are held after OMP sessions are lost.
C. While "EOR timer" is related to graceful restart concepts, particularly in BGP, the specific term used in Cisco SD-WAN for this functionality regarding OMP session loss and route retention is the "graceful restart timer."
D. The OMP hold time specifies how long a vSmart controller waits for a keepalive from a WAN Edge router before declaring the OMP session down, but it does not specify how long the WAN Edge router retains cached routes after all OMP sessions are lost.

Concept tested. Cisco SD-WAN OMP Graceful Restart

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-routing-book/sdwan-routing-book_chapter_01.html#_Configure_OMP_Timers

Topics

#OMP#Graceful Restart#Timers

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