From: Carlos G Mendioroz (tron@xxxxxxxxxxx)
Date: Wed May 22 2002 - 07:43:55 GMT-3
Kim,
do the hostnames match the dialer names ? (I mean uppercase/lowercase)
I've faced this some times in BCRAN courses, and it is related to the
far end router not being able to construct the ISDN map for the incoming
call. This is usually done via one of two ways: calling number or
authentication
matching. For the last to work, the name on the dialer has to match the
username
used for authentication (normally the calling router hostname). And this
match
is case sensitive...
"Ng, Kim Seng David (David)" wrote:
>
> Hi group,
>
> I am facing something in ISDN which I have not encountered before. Each time
I ping the far end ISDN interface IP address, the second B channel will be set
up by the remote router to send the echo-reply back to the originator of the pi
ng. I do not have load-threshold or ppp multilink configured in either routers
but I have setup ppp authentication chap and dialer maps. The switch-type used
is basic-ni1 and it has spid1 and spid2 configured. The ISDN switch simulator d
oes not send calling number IE. The routers are IOS 12.1. Below is the BRI inte
rface configuration on both routers:
>
> interface BRI0
> ip address 196.1.1.2 255.255.255.0
> encapsulation ppp
> dialer map ip 196.1.1.1 name R5 broadcast 8358661
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 0835866201
> isdn spid2 0835866401
> ppp authentication chap
>
> interface BRI0
> ip address 196.1.1.1 255.255.255.0
> encapsulation ppp
> dialer map ip 196.1.1.2 name R6 broadcast 8358662
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 0835866101
> isdn spid2 0835866301
> isdn calling-number 8358661
> ppp authentication chap
>
> Prevoiusly, I used to work with ISDN switch-type basic-net3 without spids. Th
is switch does send calling number IE and the pinging uses only one B-channel.
>
> From the above, I deduce that the router uses the calling number to determine
whether to set up the second B-channel to echo-reply. Below is the BRI interfa
ce of both routers.
>
> Just need someone to verify.
>
> Thanks
> David
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