From: li jian hua (jasonli@xxxxxxxxx)
Date: Tue Apr 30 2002 - 01:16:50 GMT-3
HI,
After DDR is up,route can be exchanged dynamically through the ISDN link.
So you can use the follwoing list:
dialer-list 1 protocol ip list 101
access-list 101 deny eigrp any any
access-list 101 permit ip any any
rgds
jason li
At 12:01 2002-4-30 +0800, Cyberoy wrote:
>Hi Ludwig.
>
>If we were to use dialer-list to deny routing protocol, I guess the routers
>may not be able to learn routes dynamically through the ISDN link.
>
>For example, if we use dialer-list to deny EIGRP routing protocol, as in the
>following example:
>dialer-list 1 protocol ip list 101
>access-list 101 deny eigrp any any
>access-list 101 permit ip any any
>
>EIGRP hello packets will not be propagated over to the remote router. Same
>if OSPF is used.
>
>We can make use of backup interfaces to maintain the learning of routes.
>
>For RIP and IGRP, we can use snapshot routing, and for OSPF, we can use
>demand-circuit. I am not sure for EIGRP, but backup interfaces is my choice
>to maintain the learning of EIGRP routes.
>
>Regards,
>Roy
>
>----- Original Message -----
>From: Ludwig Morales <lud.morales@codetel.net.do>
>To: <ccielab@groupstudy.com>
>Sent: Tuesday, April 30, 2002 5:50 AM
>Subject: DDR CONSIDERATIONS
>
>
> > Pie ChartsHi everybody
> >
> > Up until now I've been practicing all related to DDR and I think I've
>nailed
> > almost anything (would appreciate a challenge in this matter :P ) but I
>got
> > one question.
> >
> > In almost all the books I've read (Solies, Caslow etc) they always advise
> > you to be careful when using link state protocols in ISDN because updates
> > might trigger a call and keep the link up indefinitely, their one an only
> > recommendation is to use " passive interface Bri X" command under the
> > routing protocol, I know that by doing this I'll be losing the capability
> > of learning routes trough the Bri interfaces when the link is up and I
>would
> > have to relay on static routes (not the case on OSPF Demand circuit), so
>my
> > question is as fallow, why haven't this authors consider the use of
>denying
> > the routing protocol (in dialer-list) to trigger a call? would a proctor
>in
> > the actual lab consider this method less sophisticated or "an easy way
>out"?
> > is there any side effects or consideration in using this method.
> >
> > Thanks a lot for your comments.
> >
> > Regards,
> >
> >
> > Ludwig
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