Command Reference Guide

242 ● loopback 3Com Router 5000 Family and Router 6000 Family
Command Reference
loopback
Purpose Use the loopback command to enable loopback function of interface.
Use the undo loopback command to disable loopback function.
Syntax loopback { cell | local | payload | remote }
undo loopback
Parameters cell
Internal cell loopback
local
Internal loopback.
payload
External payload loopback, where data is looped back
at the framer.
remote
External line loopback.
Default By default, loopback is disabled.
Example Enable external payload loopback of ATM E3/T3 interface 2/0/0.
<3Com > system-view
[3Com ] interface atm 2/0/0
[3Com -Atm2/0/0] loopback payload
View This command can be used in the following views:
■ ATM E3/T3 Interface view