BGP's prefix-based ORF (Outbound Route Filtering) capability can send the prefix- based ingress policy configured on the local device to the BGP neighbor through the route refresh message. The BGP…

BGP's prefix-based ORF (Outbound Route Filtering) capability can send the prefix- based ingress policy configured on the local device to the BGP neighbor through the route refresh message. The BGP neighbor constructs the egress policy based on these policies and filters the routes when they are sent. Compared with configuring the routing policy on the BGP neighbor, this method not only avoids the local device from receiving a large number of useless routes, reduces the CPU usage of the local device, but also effectively reduces the configuration work of the local device.