
4-150
Example:
Entering the Ethernet Port Mode for ports1/1
,
1/4-5
,
1/8
。
Switch(config)#interface ethernet 1/1;1/4-5;1/8
Switch(Config-If-Port-Range)#
4.1.6 loopback
Command:
loopback
no loopback
Function:
Enables the loopback test function in an Ethernet port; the no command disables the loopback test on an Ethernet
port.
Command mode:
Port Mode.
Default:
Loopback test is disabled in Ethernet port by default.
Usage Guide:
Loopback test can be used to verify the Ethernet ports are working normally. After loopback has been enabled, the
port will assume a connection established to itself, and all traffic sent from the port will be received at the very same
port.
Example:
Enabling loopback test in Ethernet ports 1/1-8.
Switch(config)#interface ethernet 1/1-8
Switch(Config-If-Port-Range)#loopback