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Controlling Route Metrics
As a distance-vector protocol, RIP uses hop counts to determine the best route, but sometimes the
shortest hop count is a route over the lowest-speed link.
To manipulate RIP routes so that the routing protocol prefers a different route, manipulate the route by
using the offset command.
Exercise caution when applying an offset command to routers on a broadcast network, as the router
using the
offset command is modifying RIP advertisements before sending out those advertisements.
The distance command also allows you to manipulate route metrics. To assign different weights to
routes so that the ones with the lower weight or administrative distance assigned are preferred, use the
distance command.
To set route matrixes, use the following commands.
• Apply a weight to all routes or a specific route and ACL.
ROUTER RIP mode
distance weight [ip-address mask [access-list-name]]
Configure the following parameters:
– weight: the range is from 1 to 255. The default is 120.
– ip-address mask: the IP address in dotted decimal format (A.B.C.D), and the mask in slash
format (/x).
– access-list-name: the name of a configured IP ACL.
• Apply an additional number to the incoming or outgoing route metrics.
ROUTER RIP mode
offset-list access-list-name {in | out} offset [interface]
Configure the following parameters:
– prefix-list-name: the name of an established Prefix list to determine which incoming routes
are modified
– offset: the range is from 0 to 16.
– interface: the type, slot, and number of an interface.
To view the configuration changes, use the show config command in ROUTER RIP mode.
Debugging RIP
The debug ip rip command enables RIP debugging.
When you enable debugging, you can view information on RIP protocol changes or RIP routes.
To enable RIP debugging, use the following command.
•
debug ip rip [interface | database | events | trigger]
EXEC privilege mode
Enable debugging of RIP.
Example of the debug ip rip Command
The following example shows the confirmation when you enable the debug function.
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Routing Information Protocol (RIP)