From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Feb 23 2004 - 14:30:37 GMT-3
Ahmed,
There was a bug in ISDN code 12.1 and prior where traffic could not
be encapsulated unless there was a dialer-group applied to the interface.
This is not to say that the dialer-list even need be assigned. The best way
to have the router not initiate a call is to omit the dialer-group
dialer-list configuration.
If you have a dialer map without a phone number or omit the dialer
string, and you have interesting traffic defined, do a debug dialer and you
can see that the router is actually trying to initiate a call, but gets an
error back that there is no number to call.
In the case of the lab I would take either as acceptable. Keep in
mind that the dialer-map is not used to initiate a call, but instead used
for layer 3 to layer 2 resolutions. When doing legacy you should configure
a dialer map regardless in order to obtain layer 3 to layer 2 resolution,
but of course there are even exceptions to this rule :)
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Ahmed Mustafa
> Sent: Sunday, February 22, 2004 2:50 AM
> To: ccielab@groupstudy.com
> Subject: Internetwork Expert Lab 2 Task 4.1 - 4.3
>
> Hello Folks,
>
> Can anyone explain the following:
>
> Task 4.3) R4 should not be allowed to initiate an ISDN Call.
>
> 1) The common practice according to the other sources are
>
> Don't use the dialer string command for Dialer profiles, and
> Don't use the DN in dialer map command for legacy DDR
>
> However, in a solution guide,
>
> DN was used on R4 in a mapping command. However, the dialer-list along
> with
> dialer-group command was omitted. I know for a fact that without the
> dialer-list/dialer-group command, ISDN will never be able to initiate a
> call.
> What will be the best approach, especially if one is taking a real CCIE
> lab.
>
> 2) The broadcast command was omitted. Mainly broadcast command is
> required to
> allow routing protocols to be able to send/receive updates. Technically,
> I
> would have used broadcast keyword since the requirement was to allow
> routing
> protocol update. It was actually added on later tasks with clns-is
> though. I
> just want to be thorough while doing my tasks since no partial credit is
> awarded.
>
> Regards,
>
> Ahmed
>
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