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300-415 · Question #103

300-415 Question #103: Real Exam Question with Answer & Explanation

The correct answer is A: omp timers advertisement-interval 60 holdtime 180 graceful-restart-timer 43200. OMP timers control route update frequency, session timeout based on missed keepalives, and how long stale routing information is retained during a graceful restart.

WAN Edge Router Deployment

Question

A network administrator is tasked to make sure that an OMP peer session is closed after missing three consecutive keepalive messages in 3 minutes. Additionally, route updates must be sent every minute. If a WAN Edge router becomes unavailable, the peer must use last known information to forward packets for 12 hours. Which set of configuration commands accomplishes this task?

Options

  • Aomp timers advertisement-interval 60 holdtime 180 graceful-restart-timer 43200
  • Bomp timers advertisement-interval 1 holdtime 180 graceful-restart-timer 43200
  • Comp timers advertisement-interval 1 holdtime 180 graceful-restart-timer 720
  • Domp timers advertisement-interval 60 holdtime 60 graceful-restart-timer 720

Explanation

OMP timers control route update frequency, session timeout based on missed keepalives, and how long stale routing information is retained during a graceful restart.

Common mistakes.

  • B. The advertisement-interval is set to 1 second, but the requirement is for route updates every minute (60 seconds).
  • C. The advertisement-interval is set to 1 second, which is incorrect, and the graceful-restart-timer is 720 seconds (12 minutes), which is incorrect for a 12-hour requirement.
  • D. The holdtime is set to 60 seconds, which would close the session after only one missed keepalive, and the graceful-restart-timer is 720 seconds (12 minutes), which is incorrect for a 12-hour requirement.

Concept tested. OMP timer configuration

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-sdwan-basic-config.html#Cisco_Concept.dita_e836ec27-d0d9-4cfc-a292-0b32e18d098e

Topics

#OMP Timers#SD-WAN Configuration#Graceful Restart#WAN Edge OMP

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