PLANET WGSW-52040 - Manual (Page 162)

6-161
Function:
Enable the function of loopback detection control on a port, the no operation of this command will disable the
function.
Parameters:
shutdown set the control method as shutdown, which means to close down the port if a port loopback is found.
block set the control method as block, which means to block a port by allowing bpdu and loopback detection
messages only if a port loopback is found.
learning disable the control method of learning MAC addresses on the port, not forwarding traffic and delete the
MAC address of the port.
Default:
Disable the function of loopback diction control.
Command Mode:
Port Mode.
Usage Guide:
If there is any loopback, the port will not recovery the state of be controlled after enabling control operation on the
port. If the overtime is configured, the ports will recovery normal state when the overtime is time-out. If the control
method is block, the corresponding relationship between instance and vlan id should be set manually by users, it
should be noticed when be used.
Example:
Enable the function of loopback detection control under port1/2 mode.
Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#loopback-detection control shutdown
Switch(Config-If-Ethernet1/2)#no loopback-detection control
6.3 loopback-detection control-recovery timeout
Command:
loopback-detection control-recovery timeout <0-3600>
Function:
This command is used to recovery to uncontrolled state after a special time when a loopback being detected by the
port entry be controlled state.