From: phase90 (phase90@comcast.net)
Date: Sat Jan 24 2004 - 11:41:11 GMT-3
Nauman & Jay,
Does this mean that if you were to look at the debug q921 or
q931 output of
ISDN control plane you would see the other SPID # appear in setup messages
even though it is
not configured in the router?
Jerry
----- Original Message -----
From: "Nauman Khan" <mustafa@247emails.com>
To: "Jay Hennigan" <jay@west.net>; "Nauman Khan" <mustafa@247emails.com>
Cc: "Yasser Aly" <blackyeyes00@hotmail.com>; <ccielab@groupstudy.com>
Sent: Saturday, January 24, 2004 4:18 AM
Subject: Re: ISDN Multilink ( Problem to bring 2nd channel up )
> Jay Hennigan wrote:
>
> >I believe you are wrong, but this may be one of those "it depends" type
> >of things. SPIDs are layer 2 communication between the ISDN TE and the
> >switch, related to the actual raw B channel. If the switch requires a
> >spid for one channel, it will require it for the other as well. Note
> >that the real world may vary from a simulator and from the specific lab
> >environment.
>
> Hi Jay,
>
> Thanks for correcting me.
> I also think I am wrong when I say that:
>
> > You would need the second spid numbers if you want to bring the second
>channel up without considering load threshold. If you only specify one
>spid, then the second channel will only come up once your configured >load
threshold is corssed. (Somebody can correct me if I am wrong)
>
> which then means, that the only way to bring the second channel up is the
use of dialer load-threshold command ?
>
> but I was just trying to find out why we would ever need to specify
> 2 spids, as Yasser asked. The only time I have seen 2 spid's needing to be
specified (in real world) is when using a bas-ni switch type.
> Although it works with one spid too... (depending on how switch is setup
> from the telco side)
>
> Regarding your following comments:
>
> >SPIDs are layer 2 communication between the ISDN TE and the
> >switch, related to the actual raw B channel. If the switch requires a
> >spid for one channel, it will require it for the other as well. Note
> >that the real world may vary from a simulator and from the specific lab
> >environment.
>
> Its not necessary (in real world configuration) to have 2 spids to bring
up the second channel.
>
> For e.g. in DMS100 switch case, generally telco gives you only 1 spid
number. But that does not mean you have only one spid. You still dial out on
2 channels.
>
> The way it works is there is a thing called automatic rollover or B
channel hunt group that Telco configures on their switch. No router
configuration involved.
>
>
> What it does is when we dial xxx string (which lets say is the only string
that we got from Telco), it connects on first B channel. Now when router has
to bring up 2nd channel, it again tries xxx string, and since telco has both
b channels in one single hunt group or in automatic rollover,you will
connect on 2nd channel with the same xxx string.
>
> This is alternate to have multiple dial strings on the source router for
each B channel.
>
>
> Cheers,
>
> Nauman
>
>
>
>
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