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Commands for Port Loopback Detection Function
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Chapter 5 Commands for Port
Loopback Detection Function
5.1 debug loopback-detection
Command: debug loopback-detection
Function: After enabling the loopback detection debug on a port, BEBUG information
will be generated when sending, receiving messages and changing states.
Parameters: None.
Command Mode: Admin Mode.
Default: Disabled by default.
Usage Guide: Display the message sending, receiving and state changes with this
command.
Example:
Switch#debug loopback-detection
%Jan 01 03:29:18 2006 Send loopback detection probe packet:dev Ethernet1/10, vlan id
1
%Jan 01 03:29:18 2006 Send loopback detection probe packet:dev Ethernet1/10, vlan id
2
5.2 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.