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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 23 Configuring UDLD
Configuring UDLD
To disable UDLD on a non-fiber-optic interface, use the no udld port interface configuration command.
Note On fiber-optic interfaces, the no udld port command reverts the interface configuration to the udld
enable global configuration command setting.
Use the no udld port interface configuration command to disable UDLD on a fiber-optic interface
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 {aggressive | enable} global configuration command followed by the udld
{aggressive | enable} global configuration command re-enables UDLD globally.
• The no udld port interface configuration command followed by the udld port [aggressive]
interface configuration command re-enables UDLD on the specified interface.
• The errdisable recovery cause udld global configuration command enables the timer to
automatically recover from the UDLD error-disabled state, and the errdisable recovery interval
interval global configuration command specifies the time to recover from the UDLD error-disabled
state.
Step 3
udld port [aggressive] Specify the UDLD mode of operation:
• (Optional) aggressive— Enables UDLD in aggressive mode on the
specified interface. UDLD is disabled by default.
If you do not enter the aggressive keyword, the switch enables
UDLD in normal mode.
On a fiber-optic interface, this command overrides the udld enable
global configuration command setting.
For more information about aggressive and normal modes, see the
“Modes of Operation” section on page 23-1.
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.
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