Route map rules and BGP routes

Route map rules can apply priorities to BGP routes. On the hub, priorities can be set in a route map's rules, and the route map can be applied on BGP routes. This allows the hub to mark the preferred path learned from the spokes with a priority value (lower priority is preferred), instead of using multiple SD-WAN policy routes on the hub. When a preferred outbound route map (route-map-out-preferable) is also configured in an SD-WAN neighbor on the spoke, deploying SD-WAN rules on the hub to steer traffic from the hub to a spoke is unnecessary.

For details, see SD-WAN in large scale deployments.