Cisco Catalyst 4500 Series Command Reference Manual page 1157

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Command History Release
12.1(8a)EW
12.2(54)SG
Usage Guidelines If you enable aggressive mode, once all the switch port's neighbors have aged out either in the
advertisement or in the detection phase, UDLD and Fast UDLD restart the linkup sequence. They can
resynchronize with any potentially out-of-sync neighbor and shut down the port if the UDLD messages
from the neighbor indicate that the link state is still undetermined.
This command affects fiber interfaces only. Use the
enable UDLD on other interface types.
Examples
This example shows how to enable UDLD on all the fiber interfaces:
Switch (config)# udld enable
Switch (config)#
Related Commands Command
show udld
udld (interface configuration
mode)
OL-27596 -01
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Support for Fast UDLD was added.
Description
Displays the administrative and operational UDLD status.
Enables UDLD and Fast UDLD on an individual interface or
prevents a fiber interface from being enabled by the
configuration mode)
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
udld (global configuration mode)
udld (interface configuration mode)
command.
command to
udld (global
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