Cisco Catalyst 2960 Command Reference Manual page 536

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You can use these commands to reset an interface shut down by UDLD:

This example shows how to enable UDLD on all fiber-optic interfaces:

Switch(config)# udld enable

You can verify your setting by entering the show udld privileged EXEC command.

Related Commands

Catalyst 2960 Switch Command Reference

The udld reset privileged EXEC command to reset all interfaces shut down by UDLD

The shutdown and no shutdown interface configuration commands

The no udld enable global configuration command followed by the udld {aggressive | enable}

global configuration command to re-enable UDLD globally

The no udld port interface configuration command followed by the udld port or udld port

aggressive interface configuration command to re-enable UDLD on the specified interface

The errdisable recovery cause udld and errdisable recovery interval interval global

configuration commands to automatically recover from the UDLD error-disabled state

Chapter 2 Catalyst 2960 Switch Cisco IOS Commands

Displays UDLD administrative and operational status for all ports

or the specified port.

Enables UDLD on an individual interface or prevents a fiber-optic

interface from being enabled by the udld global configuration

Resets all interfaces shut down by UDLD and permits traffic to

again pass through.