Cisco IOS in a Nutshell, 2nd Edition

Name

neighbor — router

Synopsis

RIP/IGRP/EIGRP:

neighbor address
no neighbor address

OSPF:

neighbor address [priority value] [poll-interval seconds] [cost number]
[database-filter all]
no neighbor address [priority value] [poll-interval seconds] [cost number]
[database-filter all]

Configures

A routing neighbor

Default

No neighbors defined

Description

The behavior and syntax of this command depend on the routing protocol you are using.

For RIP, this command specifies a RIP neighbor. This is useful when you have routers that cannot receive RIP broadcasts. In this situation, use the neighbor command to specify the IP addresses of routers that should receive RIP packets directly. If you use this command, RIP packets are not broadcast; they are sent only to the specified neighbors. The neighbor command is frequently used with the passive-interface command, which specifies that the interface should only listen for routing updates.

For IGRP, the command specifies an IGRP neighbor for the router to communicate with. It is often used with the passive-interface command. As with RIP, you can use the neighbor command together with passive-interface to send updates to one or more routers without sending updates to other routers on the network. Multiple neighbor commands are allowed.

For EIGRP, the neighbor command is accepted by the parser but has no effect on the EIGRP process. It is accepted for backward compatibility with IGRP configurations.

For OSPF, you use the command to define a router’s OSPF neighbors ...