From: Jaeheon Yoo (kghost@xxxxxxxxxxxx)
Date: Sun Mar 03 2002 - 21:22:17 GMT-3
Yes, this is intuitively very confusing.
So, I always think this command by adding "of" before a routing protocol.
distribute-list 1 out (of) ospf 1
<<-------------
distribute-list 1 out int serial 0
--------->>
Jaeheon,
----- Original Message -----
From: "John Neiberger" <neiby@ureach.com>
To: "Paul Borghese" <pborghese@groupstudy.com>; <ccielab@groupstudy.com>
Sent: Monday, March 04, 2002 7:34 AM
Subject: Re: distribution lists in RIP
>
> 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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