From: John Neiberger (neiby@xxxxxxxxxx)
Date: Sun Mar 03 2002 - 19:34:54 GMT-3
This is one of those things that confuses me all the time.
> router rip
> distribute-list 1 out ospf 1
Intuitively, at least to me, this says to filter RIP routes
that match access-list 1 when redistributing to OSPF 1.
However, I don't think that's what it really does.
I think it means "When redistributing routes from OSPF 1 into
RIP, filter out routes that match access list 1 before sending
them to other RIP neighbors." If I'm wrong I hope someone will
correct me.
Regards,
John
---- On Sun, 3 Mar 2002, Paul Borghese
(pborghese@groupstudy.com) 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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