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Chapter 5 Commands for Port
Loopback Detection Function
5.1 loopback-detection control
Command: loopback-detection control {shutdown |block| learning}
no loopback-detection control
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
5.2 loopback-detection specified-vlan
Command: loopback-detection specified-vlan <vlan-list>
no loopback-detection specified-vlan [<vlan-list>]
Function: Enable the function of loopback detection on the port and specify the VLAN to
be checked; the no operation of this command will disable the function of detecting
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