RIP: Offset Lists and Update Control

RIP offset list - used to INCREASE the Hop Count. To implement:
- define the ACL defining the relevant routes
- set the Hop Count to be increased (by 13 in this case):

 (config-router)#offset-list ACCESS_LIST out 13 Fa0/0

!!! Offset Lists work only with RIP and EIGRP


RIP Updates Source Address Control

RIP Validates the source of the Update packets, so they need to be from the same subnet. If they are not, you can force the route updates by turning off the Source IP Validation:
(config-router)#no validate-update-source

*This way the RIP routes will be exchanged, but if the L3 Reachability is not established between the routers - the RIP routes will not be reachable.

If you need to define the exact sources you want to receive the RIP Updates from - use the "gateway" word on a distribute-list:

(config-router)#distribute-list PREFIX_LIST_WITH_UPDATE_PREFIXES gateway PREFIX_LIST_WITH_UPDATE_SOURCES in Fa0/0

If you need to send the Updates only when something changes in the topology (triggered Updates), there is an Interface command "ip rip triggered":

(config-if)#ip rip triggered