24-6
Catalyst 2960 Switch Software Configuration Guide
78-16881-01
Chapter 24 Configuring UDLD
Displaying UDLD Status
Resetting an Interface Disabled by UDLD
Beginning in privileged EXEC mode, follow these steps to reset all ports disabled by UDLD:
You can also bring up the port by using these commands:
• The shutdown interface configuration command followed by the no shutdown interface
configuration command restarts the disabled port.
• The no udld {aggressive | enable} global configuration command followed by the udld
{aggressive | enable} global configuration command re-enables the disabled ports.
• The no udld port interface configuration command followed by the udld port [aggressive]
interface configuration command re-enables the disabled fiber-optic port.
• 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 port or for all ports, use the show udld [interface-id]
privileged EXEC command.
For detailed information about the fields in the command output, see the command reference for this
release.
Step 3
udld port [aggressive] UDLD is disabled by default.
• udld port—Enables UDLD in normal mode on the specified port.
• udld port aggressive—Enables UDLD in aggressive mode on the
specified port.
Note Use the no udld port interface configuration command to
disable UDLD on a specified fiber-optic port.
For more information about aggressive and normal modes, see the
“Modes of Operation” section on page 24-1.
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 ports disabled by UDLD.
Step 2
show udld Verify your entries.
