Remote Neighbors

You can create RIP remote neighbors to enable the router to establish neighbor adjacencies through unidirectional interfaces, such as MPLS tunnels, rather than the standard practice of using the same interface for receipt and transmission of RIP packets. The remote neighbor can be more than one hop away through intermediate routes that are not running RIP. RIP uses the interface associated with the best route to the remote neighbor to reach the neighbor. A best route to the neighbor must exist in the IP routing table.

You must explicitly configure remote neighbors on the RIP routers to specify the remote neighbor with which the router will form an adjacency and the source IP address the router will use for RIP packets destined to its peer remote neighbor.

To form an adjacency with its remote neighbor, the router sends all RIP packets to the remote neighbor as unicast packets with the destination IP address equal to the source IP address of the remote neighbor. The loopback interface associated with the source IP address for the remote neighbor acts as a logical RIP interface for the neighbor.

To prevent routing loops, you can disable split horizon and enable poison reverse routing updates.

The remote-neighbor command to specify the remote neighbors is mandatory. Configuration of all other remote-neighbor attributes is optional.

authentication-key

authentication mode

distribute-list

exit-remote-neighbor

receive version

remote-neighbor

send version

split-horizon

time-to-live

update-source