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This feature module describes the NTT PRI NFAS feature. It includes information on the benefits of the new feature, supported platforms, related documents, and so forth.
This document includes the following sections:
This feature adds the NTT switch type to the existing NFAS with D Channel Backup feature.
ISDN Non-Facility Associated Signalling (NFAS) allows multiple ISDN PRIs to be controlled by a single D channel with an associated D channel for backup.
Once the channelized T1 controllers are configured for ISDN PRI, only the NFAS primary D channel must be configured; its configuration is distributed to all the members of the associated NFAS group.
NTT PRI NFAS provides the following benefits:
NTT PRI NFAS does not support D channel backup.
Standards
No new or modified standards are supported by this feature.
MIBs
No new or modified MIBs are supported by this feature.
RFCs
No new or modified RFCs are supported by this feature.
The router must be operational, provisioned for ISDN PRI, and contain appropriate ISDN PRI interface hardware, which must be operational and configured for ISDN PRI.
See the following sections for NTT PRI NFAS configuration tasks:
To configure NTT PRI NFAS, use the procedure described in the "Configuring NFAS on PRI Groups" section of the "Configuring ISDN Special Signalling" chapter of the Dial Services Configuration Guide: Network Services. Specify a primary-ntt switch type.
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Note You cannot configure a backup D channel for the NTT PRI NFAS feature; it does not support D channel backup. |
router# show isdn status serial 0:23 Global ISDN Switchtype = primary-ntt ISDN Serial0:15 interface
Step 2 Enter the show isdn nfas group command to display information about members of an NFAS group:
Router# show isdn nfas group 1 ISDN NFAS GROUP 1 ENTRIES: The primary D is Serial1/0:23. The NFAS member is Serial2/0:23. There are 3 total nfas members. There are 93 total available B channels. The primary D-channel is DSL 0 in state INITIALIZED. The current active layer 2 DSL is 0.
Step 3 Enter the show isdn service command to display information about ISDN channels and the service states:
Router# show isdn service PRI Channel Statistics: ISDN Se1/0:23, Channel (1-24) Configured Isdn Interface (dsl) 0 State (0=Idle 1=Propose 2=Busy 3=Reserved 4=Restart 5=Maint) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 Channel (1-24) Service (0=Inservice 1=Maint 2=Outofservice) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ISDN Se1/1:23, Channel (1-24) Configured Isdn Interface (dsl) 1 State (0=Idle 1=Propose 2=Busy 3=Reserved 4=Restart 5=Maint) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Channel (1-24) Service (0=Inservice 1=Maint 2=Outofservice) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ISDN Se2/0:23, Channel (1-24) Configured Isdn Interface (dsl) 2 State (0=Idle 1=Propose 2=Busy 3=Reserved 4=Restart 5=Maint) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Channel (1-24) Service (0=Inservice 1=Maint 2=Outofservice) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
This section provides the following configuration example:
The following example configures ISDN PRI and NFAS on three T1 controllers of a Cisco 7500 series router. The NFAS primary D channel is configured on the 1/0 controller. No NFAS D channel is configured on the 1/1 and 2/0 controllers; they are configured for 24 B channels. Once the NFAS primary D channel is configured, it is the only interface you see and need to configure. DDR configuration for the primary D channel---which is distributed to all B channels-is also included in this example.
isdn switch-type primary-ntt ! ! NFAS primary D channel on the channelized T1 controller in 1/0 controller t1 1/0 framing esf linecode b8zs pri-group timeslots 1-24 nfas_d primary nfas_interface 0 nfas_group 1 ! ! NFAS backup D channel on the channelized T1 controller in 1/1 controller t1 1/1 framing esf linecode b8zs pri-group timeslots 1-24 nfas_d none nfas_interface 1 nfas_group 1 ! ! NFAS 24 B channels on the channelized T1 controller in 2/0 controller t1 2/0 framing esf linecode b8zs pri-group timeslots 1-24 nfas_d none nfas_interface 2 nfas_group 1 ! ! NFAS primary D channel interface configuration for PPP and DDR. This ! configuration is distributed to all the B channels in NFAS group 1 on the ! three channelized T1 controllers. ! interface Serial 1/0:23 ip address 1.1.1.2 255.255.255.0 no ip mroute-cache encapsulation ppp dialer map ip 1.1.1.1 name flyboy 567898 dialer map ip 1.1.1.3 name flyboy 101112345678 dialer map ip 1.1.1.4 name flyboy 01112345678 dialer-group 1 no fair-queue no cdp enable ppp authentication chap
No new or modified commands are required for this feature.
Posted: Wed Jul 12 11:57:06 PDT 2000
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