E1 configuration
Command History
This command was introduced.Release 3.9.0
Support for E1 configuration mode was added.Release 4.0.0
Usage Guidelines
Use the loopback command for troubleshooting purposes. To verify that a loopback is configured on the
interface, use the show controllers t1 or show controllers e1 command in EXEC mode.
For E1 lines, only the local and network options are valid. For T1 lines, all listed options are valid.
Task ID
OperationsTask ID
read, writesonet-sdh
Examples
This example shows how to configure the T1 for a local loopback:
RP/0/RSP0/CPU0:router(config)# controller t1 0/6/0/0/10
RP/0/RSP0/CPU0:router(config-t1)# loopback local
Related Commands
DescriptionCommand
Displays information about the E1 links and hardware and software
drivers for the E1 controller.
show controllers e1, on page 1034
Displays information about the T1 links and hardware and software
drivers for the T1 controller.
show controllers t1, on page 1046
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Release 5.3.x
1024
T3, E3, T1, E1 Controller Commands on the Cisco ASR 9000 Series Router
loopback (T1/E1)
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