Cisco Systems 3560 사용자 설명서

Beginning in privileged EXEC mode, follow these steps to enable UDLD in the aggressive or normal 
mode and to set the configurable message timer on all fiber-optic ports on the switch: 

To disable UDLD globally, use the no udld enable global configuration command to disable normal 
mode UDLD on all fiber-optic ports. Use the no udld aggressive global configuration command to 
disable aggressive mode UDLD on all fiber-optic ports. 

Beginning in privileged EXEC mode, follow these steps either to enable UDLD in the aggressive or 
normal mode or to disable UDLD on a port:

Enter global configuration mode.

udld {aggressive | enable | message time 
message-timer-interval}

Specify the UDLD mode of operation:

aggressive—Enables UDLD in aggressive mode on all fiber-optic 
ports. 

enable—Enables UDLD in normal mode on all fiber-optic ports on 
the switch. UDLD is disabled by default. 

An individual interface configuration overrides the setting of the 
udld enable global configuration command.

For more information about aggressive and normal modes, see the 

message time message-timer-interval—Configures the period of 
time between UDLD probe messages on ports that are in the 
advertisement phase and are detected to be bidirectional. The range 
is from 1 to 90 seconds.

This command affects fiber-optic ports only. Use the udld 
interface configuration command to enable UDLD on other port 
types. For more information, see the 

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.

Enter global configuration mode.

interface interface-id

Specify the port to be enabled for UDLD, and enter interface 
configuration mode.