Router Rip - ADTRAN AOS Version R10.1.0 Command Reference Manual

Command Reference Guide Global Configuration Mode Command Set

router rip

Use the router rip command to enter the RIP Configuration mode. Use the no form of this command to
disable Routing Information Protocol (RIP) routing. Refer to the Router (RIP) Command Set on page 3020
for more information.
Syntax Description
No subcommands.
Default Values
By default, RIP is disabled.
Command History
Release 1.1 Command was introduced.
Usage Examples
The following example uses the router rip command to enter the RIP Configuration mode:
(config)#router rip
(config-rip)#
Technology Review
The RIP protocol is based on the Bellham-Ford (distance-vector) algorithm. This algorithm provides that a
network will converge to the correct set of shortest routes in a finite amount of time, provided that:
Gateways continuously update their estimates of routes.
Updates are not overly delayed and are made on a regular basis.
The radius of the network is not excessive.
No further topology changes take place.
RIP is described in RFC 1058 (Version 1) and updated in RFCs 1721, 1722, and 1723 for Version 2.
Version 2 includes components that ease compatibility in networks operating with RIP V1.
All advertisements occur on regular intervals (every 30 seconds). Normally, a route that is not updated for
180 seconds is considered dead. If no other update occurs in the next 60 seconds for a new and better
route, the route is flushed after 240 seconds. Consider a connected route (one on a local interface). If the
interface fails, an update is immediately triggered for that route only (advertised with a metric of 16).
Now consider a route that was learned and does not receive an update for 180 seconds. The route is
marked for deletion, and even if it was learned on an interface, a poisoned (metric equals 16) route should
be sent by itself immediately and during the next two update cycles with the remaining normal split horizon
update routes. Following actual deletion, the poison reverse update ceases. If an update for a learned
route is not received for 180 seconds, the route is marked for deletion. At that point, a 120-second garbage
collection (GC) timer is started. During the GC timer period, expiration updates are sent with the metric for
the timed-out route set to 16.
60000CRG0-35E Copyright © 2012 ADTRAN, Inc. 1310