Cisco Catalyst 3550 Command Reference Manual page 641

Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
You can use these commands to reset an interface shut down by UDLD:
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Examples
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 Command
show udld
udld port
udld reset
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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 udld port disable 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
Description
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 command.
Resets all interfaces shut down by UDLD and permits traffic to again pass
through.
Catalyst 3550 Multilayer Switch Command Reference
udld
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