It sounds like you're intending to use NFAS (non facility-associated signalling)
to use one D channel to control more than one PRI. In that case, you need to
state that explicitly on all your controllers.
On your "primary" controller, the one where the primary D channel is:
pri-group timeslots 1-24 nfas_d primary nfas_interface 0 nfas_group 1
On your "secondary" controller, the one with the backup D channel:
pri-group timeslots 1-24 nfas_d backup nfas_interface 1 nfas_group 1
On further controllers:
pri-group timeslots 1-24 nfas_d none nfas_interface 2 nfas_group 1
All PRIs you expect to be controlled by one D channel or a primary/backup D
channel pair must be in the same nfas_group. Increment nfas_interface by one for
each PRI you add (your 4th PRI is nfas_interface 3, for example).
Cisco documentation:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113t/113t_3/nf
as.htm
You need to make the corrections to your two controllers before you bring up any
more PRIs, or they won't function properly.
There has been a great deal of argument I've heard about how many PRIs you can
control with a single D channel. The telcos say anywhere between two and six
that I've heard. I can say that I've done 14 PRIs with one D channel on an
AS5800 - 28 PRIs on a channelized T3, D channels on 1 and 15, no redundant D
channels since they're all on one real facility anyway. I had no problems at
all, even with the initial call "rush" after reboot or other issues. Cisco seems
to allow you to configure 50-something PRIs to belong to a nfas_group. Your
mileage may vary.
Jason Young
CNS - Network Design, Anheuser-Busch
(314)577-4597
> -----Original Message-----
> From: Dave [mailto:dave@nexusinternetsolutions.net]
> Sent: Tuesday, July 31, 2001 11:24 AM
> To: cisco-nsp@puck.nether.net
> Subject: [nsp] configuring 2 D channels(T1) for 2 or more
> T1's on as5300
>
>
> IOS 12.1, Cisco AS5351
> currently have 1 T1 active, am activating second today, three
> more scheduled for
> this location next week
> the first T1 is functional with 1 D channel,
> Need to activate second t1 with D channel to provide
> redundance D channel
> service
> all future t1's will use these two D channels for signalling.
>
> pointers?
>
> controller T1 0
> framing esf
> clock source line primary
> linecode b8zs
> pri-group timeslots 1-24
> description Bell T1 555-555-5555 > 23B:1D
> !
> controller T1 1
> shutdown
> framing esf
> clock source line secondary 1
> linecode b8zs
> pri-group timeslots 1-24
> description Bell T1#2 555-555-5555 > 23B:1D
>
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