From: Brian McGahan (brian@cyscoexpert.com)
Date: Sat Jun 28 2003 - 10:22:46 GMT-3
ISDN is a non-broadcast multi-access (NBMA) media. Since there
is no native broadcast support, there is no native support for an
address resolution protocol.
Any time you are configuring a protocol on a multipoint
non-broadcast interface, you need a static layer 2 to layer 3
resolution. In the case of ISDN, these are dialer maps. In the case of
Frame-Relay, they are Frame-Relay maps, etc.
Your physical ISDN interface (BRI) is a multipoint non-broadcast
interface. Your dialer profile interface (Dialer) is a point-to-point
non-broadcast interface. Therefore, whenever configuring legacy DDR on
the BRI interface, you must have a dialer map for any protocol on that
interface. In the case of the dialer profile, all you need is to assign
the layer 2 address, which in the case of ISDN is the dialer string.
In other words, the 'dialer map' keyword should be used on the
BRI interface (or the dialer in the case of a rotary-group), and the
'dialer string' command should be used with the dialer interface.
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Toll Free: 866.CyscoXP
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> ccielab
> Sent: Saturday, June 28, 2003 1:40 AM
> To: ccielab@groupstudy.com
> Subject: Dialer string question
>
> Can anyone explain to me why the following config won;t work with the
> dialer
> string command only on R1?
>
>
>
>
> R1:
> interface BRI0/0
> ip address 10.1.1.1 255.255.255.0
> dialer string 8358662
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 0835866101 8358661
> isdn spid2 0835866301 8358663
> end
>
> dialer-list 1 protocol ip permit
>
> R2
> interface BRI0/0
> ip address 10.1.1.2 255.255.255.0
> dialer string 8358661
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 0835866201 8358662
> isdn spid2 0835866401 8358664
> end
>
> dialer-list 1 protocol ip permit
>
>
>
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