RE: ISDN Basic-Net 3

From: simon hart (simon.hart@btinternet.com)
Date: Fri May 20 2005 - 14:42:04 GMT-3

I really do not think that is the case. The encapsulation method has nothing if anything to do with the problem experienced. I believe I have narrowed it down along the lines of what Scott has described below.
It is a case of misconfigured dialing numbers, thus incorrect l3 to l2 resolution.

Simon

-----Original Message-----
From: Hinet--??? [mailto:easyman.lin@msa.hinet.net]
Sent: 20 May 2005 17:34
To: 'SIMON HART'; ccielab@groupstudy.com
Subject: Re: ISDN Basic-Net 3

I guess you must forget the line "encapsulation ppp"
if you forgot you will have "hdlc" encapsulation with your bri interface , and it will cause the two routers maintain 2 separate B channel .
as Scott mentioned ~~~

----- Original Message -----
From: "Scott Morris" <swm@emanon.com>
To: "'SIMON HART'" <simon.hart@btinternet.com>; <ccielab@groupstudy.com>
Sent: 2005e945f20f% d8 e 08:58
Subject: RE: ISDN Basic-Net 3

> It depends on what the other side configuration is.... But I'd be willing
> to bet you are ending up with two UNIdirectional links. Do a 'debug isdn
> q931' and 'debug ip packet' on the other side. You will likely see the
> first line go up, the first packet come in, and as it tries to send out the
> reply packet it will place another phone call (not realizing it's already
> connected).
>
> This has nothing to do with the isdn switch-type per se. It has to do with
> incoming call information (show dialer as an example) and whether the router
> believes it's already connected or it has to dial out to send the reply (per
> the dialer map). It's simply a L3 to L2 mapping correlation issue.
>
> HTH,
>
> Scott
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> SIMON HART
> Sent: Friday, May 20, 2005 6:38 AM
> To: ccielab@groupstudy.com
> Subject: ISDN Basic-Net 3
>
> This may seem like a fairly trivial question, but I have not seen this
> before, any help?
>
> I have configured a Legacy DDR using Basic Net-3 on an ISDN BRI0
>
> int bri0
> isdn switch-type basic-net3
> ip address 172.1.1.2 255.255.255.0
> dialer map ip 172.1.1.1 name Rack1R3 720451 dialer-group 1
>
> dialer-list 1 permit protocol ip
>
> Whenever I initiate a call from this interface both ISDN B channels come up.
> There are no dialer load threshold statements etc. I can see both lines
> coming up on the local and remote routers. I have connectivity with both
> ends (so I am not dialing back on myself).
>
> Why is this the case? How do I stop it? I am sure that this is not normal
> behaviour
>
> Thanks
>
> Simon
>
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