From: Nigel Taylor (nigel_taylor@xxxxxxxxxxx)
Date: Sun Mar 03 2002 - 17:20:33 GMT-3
Paul,
I believe the command "distribute-list 1 out ospf 1" is filtering
redistribution of ospf routes into rip, not the other way around. I'm not
sure what the "access-list 1" entails but based on the debug messages it
suggest that the routes is being suppressed because the networks are most
likely being filtered from OSPF on redistribution into RIP. This would
explain the suppression of the null updates. basically, since there is
nothing in the update then the update itself is being suppressed
http://www.cisco.com/warp/public/105/34.html
HTH
Nigel
----- Original Message -----
From: "Paul Borghese" <pborghese@groupstudy.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, March 03, 2002 2:39 PM
Subject: distribution lists in RIP
> 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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