Command Reference Guide

3Com Router 5000 Family and Router 6000 Family loopback ● 247
Command Reference
loopback
Purpose Use the loopback command to enable a serial interface to perform loopback.
Use the undo loopback command to disable the serial interface to perform
loopback.
Syntax loopback
undo loopback
Parameters None
Default By default, loopback of the serial interface is disabled.
Example Enable loopback on the serial interface.
[3Com -Serial0/0/0]loopback
View This command can be used in the following views:
■ Serial Interface view
■ AUX Interface view
■ AM Interface view
Description You need to enable loopback on the serial interface only when testing some special
functions.