Command Reference Guide

3Com Router 5000 Family and Router 6000 Family loopback ● 241
Command Reference
loopback
Purpose Use the loopback command to configure the loopback function of the POS
interface.
Use the undo loopback command to disable loopback.
Syntax loopback { local | remote }
undo loopback
Parameters local
Places the POS interface in local loopback.
remote
Places the POS interface in remote loopback.
Default By default, loopback is disabled.
Example Place the interface POS 1/0/0 in local loopback.
<3Com > system-view
[3Com ] interface pos 1/0/0
[3Com -Pos1/0/0] loopback local
View This command can be used in the following views:
■ POS Interface view
Description Loopback is enabled on an interface only for troubleshooting purpose.
If you enable loopback on a POS interface encapsulated with PPP, it is normal that the
state of the link layer protocol is reported down.