300-415 Question #214: Real Exam Question with Answer & Explanation

The correct answer is A: vpn 20 name "*** Service VPN 20 ***" router bgp 100 propagate-aspath. To propagate the BGP AS path information learned from the local service-side network through OMP to other BGP speaking routers, the propagate-aspath command is configured under the specific BGP instance within the service VPN.

WAN Edge Router Deployment

Question

A Cisco SD-WAN customer is running BGP and wants to pass on the AS number to BGP speaking routers on the service side network via OMP. Which configuration accomplishes this goal?

Options

Avpn 20 name "*** Service VPN 20 ***" router bgp 100 propagate-aspath
Bomp no shutdown overlay-as 100 graceful-restart advertise aspath
Cvpn 20 name "*** Service VPN 20 ***" router bgp 100 advertise aspath
Domp no shutdown overlay-as 100 graceful-restart advertise bgp

Explanation

To propagate the BGP AS path information learned from the local service-side network through OMP to other BGP speaking routers, the propagate-aspath command is configured under the specific BGP instance within the service VPN.

Common mistakes.

B. There is no 'advertise aspath' command directly under the OMP configuration for this purpose; 'propagate-aspath' is used within the BGP routing process.
C. 'advertise aspath' is not a valid or correct command for propagating the AS path in this context; 'propagate-aspath' is the correct command.
D. 'advertise bgp' under OMP is used to advertise BGP routes into OMP, but it does not specifically control the propagation of the AS path attribute itself.

Concept tested. BGP AS path propagation over OMP

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

Topics

#SD-WAN BGP#OMP AS-Path Propagation#VPN Routing#WAN Edge Routing

Community Discussion

No community discussion yet for this question.

Full 300-415 Practice