[cisco-voip] NFAS without backup D-channel

[Heim, Dennis]

I found this old Cisco doc (http://www.cisco.com/en/US/tech/tk801/tk379/technologies_configuration_example09186a00800a6bf2.shtml)


It states, "Note: In certain scenarios where the NFAS setup does not use a backup D channel, do not use the keyword nfas_interface 1 as it is reserved for the backup D channel. Configure only nfas_interfaces 0, 2, 3, 4 and so on." We have it configured like you mentioned. I am wondering if having nfas_interface 1 configured would cause everything not to come up since there is no backup D channel. I am not able to test, just trying to make sure I have a solution for the next maint window.

Dennis Heim
Sr. UC Engineer
World Wide Technology
Office: 314.212.1814
Email: dennis.heim at wwt.com<mailto:dennis.heim at wwt.com>
www.wwt.com<http://www.wwt.com/>

From: Erick Wellnitz [mailto:ewellnitzvoip at gmail.com]
Sent: Thursday, July 12, 2012 1:16 PM
To: Heim, Dennis
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] NFAS without backup D-channel

I assume you know which PRI has the D channel on it?

Assuming 4 PRIs....

Primary should look something like:
pri-group timeslots 1-24 nfas_d primary nfas_int 0 nfas_group 1

The rest should look something like:
pri-group timeslots 1-24 nfas_d none nfas_int 1 nfas_group 1
 pri-group timeslots 1-24 nfas_d none nfas_int 2 nfas_group 1
 pri-group timeslots 1-24 nfas_d none nfas_int 3 nfas_group 1

It may be slightly different depending on model and IOS version.




On Thu, Jul 12, 2012 at 11:59 AM, Heim, Dennis <Dennis.Heim at wwt.com<mailto:Dennis.Heim at wwt.com>> wrote:
Has anyone worked on NFAS without a backup d-channel. We cannot get the circuit to come up.

Dennis Heim
Sr. UC Engineer
World Wide Technology
Office: 314.212.1814<tel:314.212.1814>
Email: dennis.heim at wwt.com<mailto:dennis.heim at wwt.com>
www.wwt.com<http://www.wwt.com/>


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