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RIP2: Two routers cannot exchange route information

I have two 1720 router. Following are the configuration:

Router1: E0: 150.160.4.1/255.255.252.0

FE0:192.160.128.1/255.255.248.0

Router2: FE0:192.160.128.2/255.255.248.0

E0: 192.168.22.1/255.255.255.0

ip classless, rip version 2 on both routers.

RIP updates are sent only to the interface E0 NOT FE0. Why?

router1: RIP: sending v2 update to 224.0.0.9 via Ethernet0 (150.160.4.1)

Router 2: RIP: sending v2 update to 224.0.0.9 via Ethernet0 (192.168.22.1)

3d23h: RIP: build update entries - suppressing null update r run

1 ACCEPTED SOLUTION

Accepted Solutions

Re: RIP2: Two routers cannot exchange route information

it doesnt matter, whether you have enabled ripv1 or v2. Because, to enable RIP on an interface, the classful network address has to be given. when you give "network 192.168.128.0" command, it will enable RIP on the interface which has a network address configured from 192.168.1.0/24. Please note that on the fast ethernet interface, you have a /21 mask. So RIP wont be enabled. Make the mask as /24 on the fast ethernet and RIP will be enabled.

5 REPLIES

Re: RIP2: Two routers cannot exchange route information

Have you enabled RIP on both interfaces ??

RIP wont get enabled on the supernet interface. Your fast ethernet has a supernet class C address.

New Member

Re: RIP2: Two routers cannot exchange route information

I have RIP2 enabled on both interfaces.

Re: RIP2: Two routers cannot exchange route information

it doesnt matter, whether you have enabled ripv1 or v2. Because, to enable RIP on an interface, the classful network address has to be given. when you give "network 192.168.128.0" command, it will enable RIP on the interface which has a network address configured from 192.168.1.0/24. Please note that on the fast ethernet interface, you have a /21 mask. So RIP wont be enabled. Make the mask as /24 on the fast ethernet and RIP will be enabled.

New Member

Re: RIP2: Two routers cannot exchange route information

I have set a global command "ip classless". Why this would not help

Re: RIP2: Two routers cannot exchange route information

This command, doesnt help in enabling RIP on that interface. IT just changes the routing behaviour. If you have a default route configured, that route will be used to forward packets, only if "ip classless" is given.

http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a0080094823.shtml

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