Unicast RPF loose mode with the ability to discard packets with the source address pointing to the discard interface

This feature, in conjunction with remotely triggered null-route filtering, provides a mechanism to discard packets from untrusted sources. BGP policies in edge routers ensure that packets with untrusted source addresses have their next hop set to a discard route. When a packet arrives at the router with an untrusted source address, unicast RPF performs a route lookup of the source address. Because the source address route points to a discard next hop, the packet is dropped. This feature is supported on both IPv4 (inet) and IPv6 (inet6) address families.