From: Ludwig Morales (lud.morales@xxxxxxxxxxxxxx)
Date: Tue May 21 2002 - 23:17:32 GMT-3
I'm not sure, but maybe is some IOS Bug, that's a Teltone ILS-2000 you are
using to simulate ISDN right? (knew it because of the SPIDS #) .
I copied your configuration on two 2503 and configured the switch type to
basic-ni1 and it all work normally (didn't setup second channel) mail me
your IOS name and version, maybe I can download it to my routers and test
them again.
Regards,
Ludwig
----- Original Message -----
From: "Ng, Kim Seng David (David)" <ksng@avaya.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, May 21, 2002 9:41 PM
Subject: Two B-channels used for standard pinging
> 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 ping. 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 does not send calling number IE. The routers are IOS
12.1. Below is the BRI interface 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.
This 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 interface of both routers.
>
>
> Just need someone to verify.
>
> Thanks
> David
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