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?

The 'propagate-aspath' command under a specific BGP instance within a service VPN (vpn 20 in this case) ensures that the BGP AS path attribute is carried over OMP and then re-advertised to BGP neighbors on the service side of other WAN Edge routers. This preserves the AS path for loop prevention and policy enforcement across the SD-WAN fabric.

There is no 'advertise aspath' command directly under the OMP configuration for this purpose; 'propagate-aspath' is used within the BGP routing process.

'advertise aspath' is not a valid or correct command for propagating the AS path in this context; 'propagate-aspath' is the correct command.

'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.