Cisco IOS in a Nutshell, 2nd Edition

Name

router — global

Synopsis

RIP:

router rip
no router rip

BGP:

router bgp as-number
no router bgp as-number

EIGRP:

router eigrp as-system
no router eigrp as-system

IGRP:

router igrp as-system
no router igrp as-system

IS-IS:

router isis [tag]
no router isis [tag]

OSPF:

router ospf as-system
no router ospf as-system

Configures

Enters the routing configuration mode

Default

None

Description

This command starts the configuration of a routing process: it identifies the routing protocol you want to run and other parameters necessary for the routing protocol. The RIP protocol doesn’t require additional parameters; BGP requires an AS number; EIGRP, IGRP, and OSPF require process numbers (commonly called AS numbers); and IS-IS can optionally have a tag that defines a name for the routing process.

Example

! Configure our rip process
router rip
   network 10.0.0.0