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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 19 Configuring UDLD
Configuring UDLD
To disable UDLD on a non-fiber-optic interface, use the no udld enable interface configuration
command.
Note On fiber-optic interfaces, the no udld enable command reverts the interface configuration to the udld
enable global configuration command setting.
To disable UDLD on a fiber-optic interface, use the udld disable command to revert to the udld enable
global configuration command setting. This command is not supported on non-fiber-optic interfaces.
Resetting an Interface Shut Down by UDLD
Beginning in privileged EXEC mode, follow these steps to reset all interfaces shut down by UDLD:
You can also bring up the interface by using these commands:
• The shutdown interface configuration command followed by the no shutdown interface
configuration command restarts the disabled interface.
• The no udld enable global configuration command re-enables UDLD globally.
• The udld disable interface configuration command re-enables UDLD on the specified interface.
Step 3
udld {aggressive | enable} Specify the UDLD mode of operation:
• aggressive—Enables UDLD in aggressive mode on the specified
interface. For details on the usage guidelines for the aggressive
mode, refer to the command reference guide.
• enable—Enables UDLD in normal mode on the specified
interface. UDLD is disabled by default.
On a fiber-optic interface, this command overrides the udld enable
global configuration command setting.
Step 4
end Return to privileged EXEC mode.
Step 5
show udld interface-id Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
udld reset Reset all interfaces shut down by UDLD.
Step 2
show udld Verify your entries.
Step 3
copy running-config startup-config (Optional) Save your entries in the configuration file.