Cisco Cisco ASR 5700
ATM Port Configuration Mode Commands
loopback ▀
Command Line Interface Reference, StarOS Release 17 ▄
1583
loopback
Enables/disables loopback and configures the type of loopback mode used for diagnostic testing.
Product
SGSN
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > ATM Port Configuration
configure > port atm slot_number/port_number
Entering the above command sequence results in the following prompt:
[local]host_name(config-port-slot_number/port_number)#
Syntax
loopback { ds1-e1-diag | ds1-e1-line | none | sonet-sdh-diag | sonet-sdh-line }
ds1-e1-diag
Enables a system generated diagnostic lookback signal at the DS1/E1 layer.
ds1-e1-line
Loops back a network diagnostic signal at the DS1/E1 layer.
none
Stops diagnostic loopback signalling.
sonet-sdh-diag
Enables a system generated diagnostic lookback signal at the SONET/SDH layer.
sonet-sdh-line
Loops back a network diagnostic signal at the SONET/SDH layer.
Usage
Setup diagnostic loopback signals for troubleshooting purposes.
Example
Use the following command to setup loopback diagnosis:
loopback ds1-e1-diag
Use the following command to disable loopback:
loopback none