RIP Configuring

RIP Configuring

7.2.2  This page will explain how RIP is configured.
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 associates specific interfaces with the network addresses and begins to send and receive 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. Most routing protocols use a combination of time-driven and event-driven updates. RIP is time-driven, but the Cisco implementation of RIP sends triggered updates whenever a change is detected. Topology changes also trigger immediate updates in IGRP routers, regardless of the update timer. Without triggered updates, RIP and IGRP will not perform. 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. 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 a directly connected router that also runs RIP.
RIP must be enabled and the networks must be specified. All other tasks are optional. These optional tasks include the following:

• Apply offsets to routing metrics
• Adjust timers
• Specify a RIP version
• Enable RIP authentication
• Configure route summarization on an interface
• Verify IP route summarization
• Disable automatic route summarization
• Run IGRP and RIP concurrently
• Disable the validation of source IP addresses
• Enable or disable split horizon
• Connect RIP to a WAN

To enable RIP, use the following commands in global configuration mode:

• Router(config)#router rip – Enables the RIP routing process
• Router(config-router)#networknetwork-number – Associates a network with the RIP routing process

The Lab Activities will let students examine a router topology and configure RIP.
The next page will introduce the ip classless command