The route enable command enables the user network route (UNR) delivery function for addresses in the static mapping public address pool.
The undo route enable command disables the UNR delivery function for addresses in the static mapping public address pool.
In a scenario where a public network user proactively accesses an address in the public address pool, after the FW receives this packet, no session entry can be matched. The packet is forwarded to the router based on the default route. After the router receives the packet, it looks up the routing table and forwards it to the FW. This packet is then looped between the FW and router. That is, a route loop occurs.
After you configure this command, the FW generates a UNR for addresses in the public address pool. This UNR, like the blackhole route, can prevent route loops and can be imported and advertised by dynamic routing protocols, such as OSPF.
If addresses in the public address pool and outgoing interface addresses are on different network segments, you must configure a blackhole route. If they are on the same network segment, configuring a blackhole route is recommended.
If they are the same, no route loops will be generated, and you do not need to configure a blackhole route.
By default, the UNR delivery function for addresses in the static mapping public address pool is disabled.