down-when-looped (T1/E1)
To configure a T1 or E1 controller to inform the system that it is down when loopback is detected, use the
down-when-looped command in T1 or E1 configuration mode.
down-when-looped
Syntax Description
This command has no keywords or arguments.
Command Default
By default, a T1 or E1 controller does not inform the system that it is down when loopback is detected.
Command Modes
T1 configuration
E1 configuration
Command History
ModificationRelease
This command was introduced.Release 3.9.0
Support for E1 configuration mode was added.Release 4.0.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
This command does not have a no form.
Task ID
OperationsTask ID
read, writesonet-sdh
read, writeinterface
Examples
The following example shows how to configure a T1 controller to inform the system that the associated line
is down if a loopback is detected:
RP/0/RSP0/CPU0:router(config)# controller t1 0/4/2/0/1
RP/0/RSP0/CPU0:router(config-t1)# down-when-looped
down-when-looped is a traffic-affecting operation if any loopback is present
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Release 5.3.x
990
T3, E3, T1, E1 Controller Commands on the Cisco ASR 9000 Series Router
down-when-looped (T1/E1)
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