Specifications

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Catalyst 2970 Switch Software Configuration Guide
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Chapter 21 Configuring UDLD
Displaying UDLD Status
Resetting an Interface Disabled by UDLD
Beginning in privileged EXEC mode, follow these steps to reset all interfaces disabled 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 the disabled interfaces.
• The udld port disable interface configuration command followed by the udld port [aggressive]
interface configuration command re-enables the disabled fiber-optic 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.
Displaying UDLD Status
To display the UDLD status for the specified interface or for all interfaces, use the show udld
[interface-id] privileged EXEC command.
For detailed information about the fields in the command output, refer to the command reference for this
release.
Step 3
udld port {aggressive | disable} UDLD is disabled by default.
• udld port—Enables UDLD in normal mode on the specified
interface.
• udld port aggressive—Enables UDLD in aggressive mode on the
specified interface.
• udld port disable—Disables UDLD on the specified fiber-optic
interface. This command overrides the UDLD global setting and is
available only on fiber-optic interfaces.
For more information about aggressive and normal modes, see the
“Modes of Operation” section on page 21-1.
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 disabled by UDLD.
Step 2
show udld Verify your entries.