Enabling Udld On An Interface; Resetting An Interface Disabled By Udld - Cisco Catalyst 2960 Software Configuration Manual
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Configuring UDLD
Enabling UDLD on an Interface
Beginning in privileged EXEC mode, follow these steps either to enable UDLD in the aggressive or
normal mode or to disable UDLD on a port:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
udld port [aggressive]
Step 4
end
Step 5
show udld interface-id
Step 6
copy running-config startup-config
Resetting an Interface Disabled by UDLD
Beginning in privileged EXEC mode, follow these steps to reset all ports disabled by UDLD:
Command
Step 1
udld reset
Step 2
show udld
You can also bring up the port by using these commands:
•
•
•
•
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
24-6
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.
Purpose
Enter global configuration mode.
Specify the port to be enabled for UDLD, and enter interface
configuration mode.
UDLD is disabled by default.
Note
When a switch joins a switch stack, it retains its
interface-specific UDLD settings.
•
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
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Reset all ports disabled by UDLD.
Verify your entries.
Chapter 24
Configuring UDLD
24-1.
OL-26520-01
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