Command Reference Guide

3Com Router 5000 Family and Router 6000 Family loopback (CE3 Interface) ● 249
Command Reference
loopback (CE3 Interface)
Purpose Use the loopback command to configure the loopback mode of a CE3 interface.
Use the undo loopback command to disable the CE3 interface to perform
loopback.
Syntax loopback { local | payload | remote }
undo loopback
Parameters local
Enables the CE3 interface to perform local loopback.
payload
Places the CE3 interface in an remote payload
loopback. Data passes the framer in this case and is
looped back after payload is generated.
remote
Enables the CE3 interface to perform remote
loopback. Data does not go through the framer in this
case and will be looped back before the payload has
been generated.
Default By default, loopback is disabled on the CE3 interface.
Example Enable the interface E3 1/0/0 to perform local loopback.
[3Com -E3 1/0/0] loopback local
View This command can be used in the following views:
■ CE3 Interface view
Description It is necessary for you to enable the CE3 interface to perform loopback only for
testing some special function.
If a CE3 interface encapsulated with PPP is placed in a loopback, it is normal that the
state of the link layer protocol is reported down.