Cisco Systems 3750E Enabling Udld Globally, Udld aggressive enable message time, Show udld, 29-5

Chapter 29 Configuring UDLD

Configuring UDLD

Enabling UDLD Globally

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 and all members in the switch stack:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2 udld {aggressive enable message time		Specify the UDLD mode of operation:
	message-timer-interval}	• 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
		“Modes of Operation” section on page 29-1.
		• 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.
		Note The global UDLD setting is automatically applied to switches
		that join the switch stack.
		Note 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 “Enabling UDLD on an
		Interface” section on page 29-6.
Step 3
	end	Return to privileged EXEC mode.
Step 4
	show udld	Verify your entries.
Step 5
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

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.

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-02 29-5