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The
router rip
command enables RIP as the routing protocol. The
network
command is then used to tell the router on which interfaces to run
RIP.
The routing process then associates specific interfaces with the
network addresses and begins sending and receiving RIP updates on
these interfaces. RIP sends
routing-update messages at regular intervals. When a router receives a
routing update that includes changes to an entry, it updates its
routing table to reflect the new route. The received metric value for
the path is increased by 1, and the source interface of the update is
indicated as the next hop in the routing table. RIP routers maintain
only the best route to a destination but can maintain multiple
equal-cost paths to the destination.
A router running RIP can be configured to send a triggered update when
the network topology changes using the
ip rip triggered
command. This command is issued only on serial interfaces at the
router(config-if)#
prompt. After updating its routing table due to a configuration
change, the router immediately begins transmitting routing updates in
order to inform other network routers of the change. These updates,
called triggered updates, are sent independently of the regularly
scheduled updates that RIP routers forward. For example, the descriptions for the
commands used to configure router BHM shown in the figure are as
follows:
- BHM(config)#router rip –
Selects RIP as the routing protocol
- BHM(config-router)#network
10.0.0.0 – Specifies a directly connected network
- BHM(config-router)#network
192.168.13.0 – Specifies a directly connected network
The Cisco router interfaces that are
connected to networks 10.0.0.0 and 192.168.13.0 send and receive RIP
updates. These routing updates allow the router to learn the network
topology from neighboring router also running RIP.
RIP must be enabled and the networks
specified. The remaining tasks are optional. Among these optional
tasks are:
- Applying offsets to routing metrics
- Adjusting timers
- Specifying a RIP version
- Enabling RIP authentication
- Configuring route summarization on
an interface
- Verifying IP route summarization
- Disabling automatic route
summarization
- Running IGRP and RIP concurrently
- Disabling the validation of source
IP addresses
- Enabling or disabling split horizon
- Connecting RIP to a WAN
To enable RIP, use the following
commands beginning in global configuration mode:
- Router(config)#router
rip – Enables the RIP routing
process
- Router(config-router)#network
network-number – Associates a network with the RIP routing
process
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Lab Activity
Lab Exercise: Configuring RIP
This lab is to setup an IP addressing
scheme using class B networks and configure the RIP dynamic
routing protocol on routers.
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Lab Activity
e-Lab Activity: RIP
In this lab, the students will take a look at the router
topology before starting the lab.
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Web Links