Check out the offset-list command in rip router config mode. Its not real clear but it keys on the source of the advertisements not the advertisements themselves. It adds cost or hops to routes learned from listed hosts or interfaces. Here's the cco doc description.
offset-list
To add an offset to incoming and outgoing metrics to routes learned via Routing Information Protocol (RIP), use the offset-list command in router configuration mode. To remove an offset list, use the no form of this command.
offset-list {access-list-number | access-list-name} {in | out} offset [interface-type interface-number]
no offset-list {access-list-number | access-list-name} {in | out} offset [interface-type interface-number]
Syntax Description
access-list-number
Standard access list number to be applied. Access list number 0 indicates all access lists. If offset is 0, no action is taken. For IGRP, the offset is added to the delay component only.
access-list-name
Standard access list name to be applied.
in
Applies the access list to incoming metrics.
out
Applies the access list to outgoing metrics.
offset
Positive offset to be applied to metrics for networks matching the access list. If the offset is 0, no action is taken.
interface-type
(Optional) Interface type to which the offset list is applied.
interface-number
(Optional) Interface number to which the offset list is applied.
Defaults
This command is disabled by default.
Command Modes
Router configuration
Command History
Release Modification
10.0
This command was introduced.
10.3
The interface-type and interface-number arguments were added.
11.2
The access-list-name argument was added.
Usage Guidelines
The offset value is added to the routing metric. An offset list with an interface type and interface number is considered extended and takes precedence over an offset list that is not extended. Therefore, if an entry passes the extended offset list and the normal offset list, the offset of the extended offset list is added to the metric.
Examples
In the following example, the router applies an offset of 10 to the delay component of a router only to access list 21:
offset-list 21 out 10
In the following example, the router applies an offset of 10 to routes learned from Ethernet interface 0:
offset-list 21 in 10 ethernet 0
