CANOGA PERKINS 9175 Configuration Guide - Manual (Page 91)

CanogaOS Configuration Guide
16-1
16 Configuring RIP
16.1 Overview
Routing Information Protocol (RIP) is an IP route exchange protocol that uses a distance
vector (a number representing distance) to measure the cost of a given route. The cost is
a distance vector because the cost is often equivalent to the number of router hops
between the source and the destination networks. RIP can receive multiple paths to a
destination. The software evaluates the paths, selects the best path, and saves the path
in the IP route table as the route to the destination. Typically, the best path is the path
with the fewest hops. A hop is another router through which packets must travel to reach
the destination. If RIP receives a RIP update from another router that contains a path
with fewer hops than the path stored in the route table, the software replaces the older
route with the newer one. The software then includes the new path in the updates it
sends to other RIP routers. RIP routers also can modify a route’s cost, generally by
adding to it, to bias the selection of a route for a given destination. In this case, the actual
number of router hops may be the same, but the route has an administratively higher
cost and is thus less likely to be used than other, lower-cost routes. A RIP route can have
a maximum cost of 15. Any destination with a higher cost is considered unreachable.
Although limiting to larger networks, the low maximum hop count prevents endless loops
in the network.
This chapter contains basic RIP configuration examples. To see details on the
commands used in these examples, or to see the outputs of the Validation commands,
refer to the RIP Command Reference. To avoid repetition, some Common commands,
like configure terminal, have not been listed under the Commands Used section. These
Common commands are explained in the NSM Command Reference.
16.2 Enabling RIP
This example shows the minimum configuration required for enabling RIP on an
interface. R1 and R2 are two routers connecting to network 10.10.11.0/24. R1 and R2
are also connected to networks 10.10.10.0/24 and 10.10.12.0/24 respectively. To enable
RIP, first define the RIP routing process and then associated a network with the routing
process.
Figure 16-1: RIP Topology
R1
DUT# configure terminal Enter the Configure mode.
DUT(config)# router rip Enter the RIP routing process.
DUT(config-router)#network
10.10.10.0/24 Associate networks with the RIP process.