RIP advertisements

Unanswered Question
Feb 2nd, 2009
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There is a Cisco router 3 Ethernet interfaces connected to 3 different IP networks for instance 172.18.32.80/29(A) , 172.18.32.72/29(B) and 192.168.1.0/24(C). I do not want to run RIP on all three interfaces and I want 192.168.1.0/24 network updated to every other interface and all routes coming in 172.18.32.80 and 172.18.32.72. I do not want routes coming in via 172.18.32.80 to be sent to 172.18.32.72 and vice-versa.



In summary I do not want routes coming over A not to be advertised to B and route advertisements sourced at B not to be advertised at A. I would like to advertise routes reachable via C to A and B and routes reachable via A to C and routes reachable via B to C.


thanks


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Istvan_Rabai Mon, 02/02/2009 - 21:40
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Hi Krishnan,


You can use distribute-lists to filter out the desired routes advertised on specific interfaces.


http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfrip.html


Another possible solution is to use offset-lists to change the metric of some selected routes to 16 (infinite).

The receiving routers will treat those routes as unusable and those will not appear in the routing tables.


You can find usage guide-lines and config examples for both the distribute-lists and offset-lists under the given url.


Cheers:

Istvan


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