Re: Filtering Routes in RIP

Actually, I think you mean to say it is a logical AND operation.

Both conditions must be met. The actual route must match against
<routeprefixlist>, and the route source must match against
<gatewayprefixlist>.

So in the OP configuration:

ip prefix-list ALLOW_SPECIFIC
seq 5 permit 30.0.0.0/14
seq 10 deny 0.0.0.0/0 le 32

ip prefix-list GATEWAY_R4
seq 5 deny 155.1.0.4/32
seq 10 permit 0.0.0.0/0 le 32

router rip
version 2
distribute-list prefix ALLOW_SPECIFIC gateway GATEWAY_R4 in Serial0/0

This will match: ONLY 30.0.0.0/14 from any source EXCEPT 155.1.0.4/32, for
Serial0/0

-Yuri

On Sun, Aug 21, 2011 at 5:54 PM, sameer khan <khanzadap_at_hotmail.com> wrote:

> That to the best of my understand is incorrect. it will filter out all
> routes from gateway 155.1.0.4 OR it will only permit 30.0.0.0/14 from any
> other gateway. As i said before it is Logical OR operation and not logical
> AND between the two prefix-list used.
>
> HTH
>
>
>
> > From: roy.waterman_at_gmail.com
> > Date: Sun, 21 Aug 2011 23:15:44 +0100
> > Subject: Re: Filtering Routes in RIP
> > To: bxperts_at_gmail.com
> > CC: ccielab_at_groupstudy.com
> >
> > Hi Shahid
> >
> > In the case of your config, only the prefix 30.0.0.0/14 will be accepted
> > from all gateways apart from 155.1.0.4, for updates received on
> serial0/0.
> >
> > Regards
> > Roy
> >
> > On 20 August 2011 22:01, Shahid Mushtaq <bxperts_at_gmail.com> wrote:
> >
> > > Dears,
> > >
> > >
> > >
> > > I want to filter specific routes in RIP from one gateway while allowing
> > > from
> > > others.
> > >
> > >
> > >
> > > If I have the following configuration then how the routes will be
> treated.
> > > The distribute-list will only allow "30.0.0.0/14" from all gateways or
> it
> > > will be only specific to "155.1.0.4" gateway.
> > >
> > >
> > >
> > > To more specific, the distribute will go to check the check the prefix
> then
> > > the gateway or some other method.
> > >
> > >
> > >
> > >
> > >
> > > ip prefix-list ALLOW_SPECIFIC
> > >
> > > seq 5 permit 30.0.0.0/14
> > >
> > > seq 10 deny 0.0.0.0/0 le 32
> > >
> > >
> > >
> > > Ip prefix-list GATEWAY_R4
> > >
> > > seq 5 deny 155.1.0.4/32
> > >
> > > seq 10 permit 0.0.0.0/0 le 32
> > >
> > >
> > >
> > > Router RIP
> > >
> > > Version 2
> > >
> > > distribute-list prefix ALLOW_SPECIFIC gateway GATEWAY_R4 in Serial0/0
> > >
> > >
> > >
> > >
> > >
> > > Regards,
> > >
> > >
> > >
> > > Shahid
> > >
> > >
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> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> > --
> > Regards
> > Roy
> >
> >
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Received on Sun Aug 21 2011 - 23:47:34 ART