From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Jan 28 2005 - 18:21:26 GMT-3
Vijay,
It actually depends on the version. Some older IOS versions
would not allow the BRI interface to accept or initiate a call without
the "dialer-group" command applied to the interface. Even if there was
no dialer-list defined it was still required. In the current releases
this is not the case. As for the "dialer map" statement, it depends
what encapsulation you are using.
For HDLC encapsulation you must issue the dialer map statement
on a multipoint ISDN interface (main interface or dialer rotary group).
For PPP encapsulation it's not required on the receiving side of a
multipoint interface, as a dynamic mapping can be formed during IPCP
negotiation. This is not to say that you are not using a dialer map.
If you issue the "show dialer map" command you will see that in fact
layer 3 to layer 2 resolution is still there, but it is simply dynamic.
There are other situations that can affect the necessity for
dialer map statements, such as PPP callback or hub-and-spoke ISDN.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Vijaybhasker.Vuppala2@ge.com
> Sent: Friday, January 28, 2005 12:40 PM
> To: mani_ccie@yahoo.com; Nuvo25@hotmail.com; ccielab@groupstudy.com
> Subject: RE: ISDN - Dialer Map IP
>
> one the called site(receiving side), I haven't added any dialer-map or
> dialer-group and dialer-list still it works....
>
> Mani...are you sure, if yes, can you explain why it's required....
>
> -----Original Message-----
> From: mani poopal [mailto:mani_ccie@yahoo.com]
> Sent: Friday, January 28, 2005 5:11 AM
> To: Jonathan ZD; CCIE - GS
> Subject: Re: ISDN - Dialer Map IP
>
>
> Hi John,
>
> You need both dialer-list, dialer-group and dialer-map commands but
you
> don't have to specify dialer-string in the dialer map statement. The
> reason, if you want to configure a DDR(dial on demand routing) you
must
> have
> dialer-list, dialer-group and dialer-map commands.
>
> Mani
>
> Jonathan ZD <Nuvo25@hotmail.com> wrote:
> Hello GS,
>
> I need the clearification for ISDN configuration:
>
> On the called side (router that receive the call) that will not make
any
> call
> to any other peers, do the commands "dialer map ip" and "dialer-group"
are
> needed on the bri-int configuration?
>
> Thanks,
>
> Jone
>
>
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