Enabling Loopback Test - 3Com E4500-24 Cli Configuration Manual

To do...
Enable
loopback
detection
on the
specified
Enable
ports in
loopback
bulk
detection
on the
Enable
ports
loopback
detection
on a
specified
port
To enable loopback detection on a specific port, you must use the loopback-detection enable
command in both system view and the specific port view.
After you use the undo loopback-detection enable command in system view, loopback detection
will be disabled on all ports.
The loopback-detection control enable command and the loopback-detection per-vlan
enable command are not applicable to access ports. When the link type of a non-access port
changes to access, the two commands already configured on the port become invalid
automatically.

Enabling Loopback Test

You can configure the Ethernet port to run loopback test to check if it operates normally. The port
running loopback test cannot forward data packets normally. The loopback test terminates
automatically after a specific period.
Follow these steps to enable loopback test:
To do...
Enter system view
Enter Ethernet port view
Enable loopback test
Use the command...
loopback-detection
interface-list enable
interface interface-type
interface-number
loopback-detection enable
Use the command...
system-view
interface interface-type interface-number
loopback { external | internal }
1-7
Remarks
Use either command.
By default, the loopback detection
function is enabled if the device boots
with the default configuration file
(config.def);
By default, this function is disabled. if
the device boots with null configuration,
—
—
Required
Remarks