300-415 · Question #222
An enterprise is continuously adding new sites to its Cisco SD-WAN network. It must configure any cached routes flushed when OMP peers have lost adjacency. Which configuration allows the cached OMP…
The correct answer is A. Basic Configuration tab. Graceful Restart for OMP: On. Overlay AS Number: 1. Graceful Restart Timer (seconds): 86400. Number of Paths Advertised per Prefix: 3. ECMP Limit: 4. Shutdown: No. To ensure cached OMP routes are flushed after a specific duration following an OMP peer adjacency loss, OMP Graceful Restart must be enabled with the Graceful Restart Timer set to the desired period. Setting the timer to 86400 seconds will flush routes after 24 hours.
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- ABasic Configuration tab. Graceful Restart for OMP: On. Overlay AS Number: 1. Graceful Restart Timer (seconds): 86400. Number of Paths Advertised per Prefix: 3. ECMP Limit: 4. Shutdown: No.
- BBasic Configuration tab. Graceful Restart for OMP: On. Overlay AS Number: 24. Graceful Restart Timer (seconds): 600000. Number of Paths Advertised per Prefix: 2. ECMP Limit: 2. Shutdown: No.
- CBasic Configuration tab. Graceful Restart for OMP: On. Overlay AS Number: 24. Graceful Restart Timer (seconds): 43200. Number of Paths Advertised per Prefix: 2. ECMP Limit: 2. Shutdown: No.
How the community answered
(37 responses)- A73% (27)
- B16% (6)
- C11% (4)
Why each option
To ensure cached OMP routes are flushed after a specific duration following an OMP peer adjacency loss, OMP Graceful Restart must be enabled with the Graceful Restart Timer set to the desired period. Setting the timer to 86400 seconds will flush routes after 24 hours.
The requirement is to flush cached OMP routes after 24 hours, which translates to 86400 seconds (24 hours * 60 minutes/hour * 60 seconds/minute). Enabling Graceful Restart for OMP and setting the Graceful Restart Timer to 86400 seconds fulfills this specific requirement by dictating how long routes are held after a peer becomes unreachable before being flushed.
A Graceful Restart Timer of 600000 seconds is significantly longer than 24 hours, therefore it does not meet the requirement of flushing routes after every 24 hours.
A Graceful Restart Timer of 43200 seconds is 12 hours, which does not meet the requirement of flushing routes after every 24 hours.
Concept tested: OMP Graceful Restart Configuration
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-routing.html#concept_x3t_j2j_vnb
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