300-415 Question 155
Single answerYou are deploying Cisco SD-WAN in a branch office and configuring BGP to exchange routes between the SD-WAN overlay and a local on-premise network. You notice that the BGP routes from the local network are not being advertised to other branches in the SD-WAN fabric. Which configuration step is required to resolve this issue?
- A
Enable the 'advertise-locally' command under the BGP configuration on the branch vEdge router.
- B
Configure BGP route redistribution into OMP on the branch vEdge router.
- C
Enable the 'bgp propagate' option in the vManage policy settings.
- D
Activate a service-side VPN for BGP on the branch vEdge router.
Show answer and explanation
Correct answer: B
Explanation
In Cisco SD-WAN, BGP routes learned on the branch vEdge router are not automatically advertised to other branches in the SD-WAN overlay. For these routes to propagate, they must first be redistributed into OMP. OMP is the protocol responsible for advertising routes between vEdge devices in the SD-WAN fabric. Configuring BGP route redistribution into OMP ensures that the BGP routes from the local network are advertised across the SD-WAN fabric.
- A. Incorrect.
The 'advertise-locally' command is not a valid Cisco SD-WAN command for BGP configuration. This option is incorrect.
- B. Correct.
BGP routes from the local network must be redistributed into the Overlay Management Protocol (OMP) on the vEdge router for them to be advertised across the SD-WAN fabric. Without this configuration, the SD-WAN overlay will not propagate the BGP-learned routes.
- C. Incorrect.
The 'bgp propagate' option does not exist in Cisco SD-WAN configurations. This option is incorrect.
- D. Incorrect.
While activating a service-side VPN is necessary for enabling BGP, this step does not directly address the redistribution of BGP routes into the SD-WAN fabric. This option is incomplete and incorrect for the given scenario.