From: Fred Ingham (fningham@xxxxxxxxxxxxxxxx)
Date: Sun Mar 03 2002 - 19:39:33 GMT-3
Paul: To filter the routes use: router ospf 1
redistribute rip subnets
distribute-list 1 out rip
Cheers, Fred.
Paul Borghese wrote:
>
> I have a configuration where I would like to redistribute from RIP to OSPF.
> I would prefer to apply a filter to limit my distributions. I am running
> RIP on an ethernet interface and OSPF on a serial interface. When I apply
> the command:
>
> router rip
> distribute-list 1 out ospf 1
>
> It filters the RIP updates out the ethernet interface. So the router seems
> to ignore the fact that I told it to only filter when redistrbuting into
> OSPF and instead filters regular rip updates. Here is some debugging
> output:
>
> Before applying distribute-list 1 out ospf:
> --------------------------------------------------------------------
> 02:24:10: RIP: sending v1 update to 255.255.255.255 via Ethernet0
> (190.27.2.3)
> 02:24:10: RIP: build update entries
> 02:24:10: network 87.0.0.0 metric 7
> 02:24:10: network 180.70.0.0 metric 7
> 02:24:10: subnet 190.27.1.0 metric 7
> 02:24:10: subnet 190.27.10.0 metric 7
> 02:24:10: subnet 190.27.11.0 metric 7
> -------------------------------------------------------------------------
>
> Notice there are a number of routes being advertised out E0.
>
> Now I will apply the command:
> ----------------------------------------------------------------------------
> --
> R7(config-router)#router rip
> R7(config-router)#distribute-list 1 out ospf 1
> R7(config-router)#
> 02:24:15: RIP: Distribute-list changed: sending triggered update
> R7(config-router)#
> 02:24:35: RIP: sending v1 update to 255.255.255.255 via Ethernet0
> (190.27.2.3)
> 02:24:35: RIP: build update entries - suppressing null update
> ----------------------------------------------------------------------------
> --------
>
> Notice the update did not have any entries. So the command distribute-list
> 1 out ospf 1 blocks routes from leaving the ethernet interface.
>
> Why?
>
> Paul Borghese
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