From: Ludwig Morales (lud.morales@xxxxxxxxxxxxxx)
Date: Tue Apr 30 2002 - 02:01:55 GMT-3
I understand what you say, but for what I've read I understand that denying
EIGRP in this dialer list only avoid EIGRP from triggering the call, but
when the call is established because any other ip packet (defined as
interesting) trigger it, all update packets will be able to flow trough this
link,
That's why I consider (until now) dialer watch to be the easier way since
all I have to do is create a loopback on the remote router and watch it on
the hub deny eigrp as interesting and permit any ip packet, as soon as that
loopback disappears because the main link went down the router will call the
hub and start exchanging updates trough the bri, and in a couple of seconds
I'll have the entire route.
That's my point of view, what's gona be (in order of difficulty) your
strategy (OSPD demand circuit, snapshot, backup interfaces) in this part in
the exam (assuming they don ask you specifically for one type of
configuration)
Regards,
Ludwig
----- Original Message -----
From: "Cyberoy" <cyberoy@mbox5.singnet.com.sg>
To: "Ludwig Morales" <lud.morales@codetel.net.do>; <ccielab@groupstudy.com>
Sent: Tuesday, April 30, 2002 12:01 AM
Subject: Re: DDR CONSIDERATIONS
> 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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