Cisco Catalyst 2950 Command Reference Manual page 553

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
Use the udld port aggressive command on fiber-optic ports to override the settings of the udld enable
or udld aggressive global configuration command. Use the no form on fiber-optic ports to remove this
setting and to return control of UDLD enabling to the udld global configuration command or to disable
UDLD on nonfiber-optic ports.
If the switch software detects a Gigabit Interface Converter (GBIC) module change and the interface
changes from fiber optic to nonfiber optic or from nonfiber optic to fiber optic, all configurations are
maintained.
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 in normal mode on an interface:
Switch(config)# interface fastethernet0/2
Switch(config-if)# udld port
This example shows how to disable UDLD on a fiber-optic interface despite the setting of the udld
global configuration command:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# no udld port
You can verify your settings by entering the show running-config or show udld privileged EXEC
command.
Related Commands Command
show running-config
show udld
udld
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 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
Description
Displays the running configuration on the switch. For syntax information,
select Cisco IOS Configuration Fundamentals Command Reference for
Release 12.1 > Cisco IOS File Management Commands > Configuration
File Commands.
Displays UDLD status for all ports or the specified port.
Enables UDLD on all fiber-optic ports on the switch.
Resets all interfaces shut down by UDLD and permits traffic to again pass
through.
Catalyst 2950 and Catalyst 2955 Switch Command Reference
udld port
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