User guide

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Configuration Guide for Cisco DSLAMs with NI-2
OL-2074-03
Chapter 4 Configuring Digital Subscriber Lines
Enabling and Disabling ATM Local Loopback
Enabling and Disabling ATM Local Loopback
When you enable the loopback functionality, loopback cells are inserted on designated VPCs/VCCs. The
NI-2 notifies you through the management information base (MIB) or Interim Local Management
Interface (ILMI) if loopback cells do not return.
This section describes how to enable and disable ATM local loopback on a port.
To enable ATM local loopback on a port, follow these steps:
To disable ATM local loopback on a port, follow these steps:
This command retrains the port if you change the parameter. Setting a parameter to its previous value
does not cause a retrain. If a port is training when you change this parameter, the port untrains and
retrains to the new parameter.
Example
This command disables ATM local loopback for port 1 on slot 1 and displays the results:
DSLAM# configure terminal
DSLAM(config)# interface atm 1/1
DSLAM(config-if)# no loopback diagnostic
DSLAM(config-if)# end
DSLAM# show dsl interface atm 1/1
Port Status:
Subscriber Name: Circuit ID:
IOS admin: UP oper: UP Card status: Present
Last Change: 36352 days, 13 hrs, 51 min, 47 sec No. of changes: 0
Line Status: TRAINED
Test Mode: NONE
Loopback: NONE
ADSL Chipset Self-Test: NONE
CO Modem Firmware Version: 0x1319BE02
.
.
.
Command Task
Step 1
DSLAM# configure terminal
Go to global configuration mode.
Step 2
DSLAM(config)# interface atm slot/port
Go to interface configuration mode and specify the port
for which you want to enable local loopback.
Step 3
DSLAM(config-if)# loopback diagnostic
Enable the loopback diagnostic for the selected port.
Step 4
DSLAM(config-if)# end
Exit from profile configuration mode.
Command Task
Step 1
DSLAM# configure terminal
Go to global configuration mode.
Step 2
DSLAM(config)# interface atm slot/port
Go to interface configuration mode and specify the port
for which you want to enable local loopback.
Step 3
DSLAM(config-if)# no loopback diagnostic
Disable the loopback diagnostic for the selected port.
Step 4
DSLAM(config-if)# end
Exit from profile configuration mode.