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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 28 Configuring UDLD
Configuring UDLD on the Switch
Configuring a UDLD Probe Message Interval Globally
To configure the time between UDLD probe messages on ports that are in advertisement mode and are
currently determined to be bidirectional, perform this task:
Configuring a Fast UDLD Probe Message Interval per Interface
To configure the time between Fast UDLD probe messages on ports that are in advertisement mode and
are currently determined to be bidirectional at the interface level, perform this task:
Resetting Disabled LAN Interfaces
To reset all LAN ports that have been errdisabled by UDLD, use this command:
Command Purpose
Step 1
Switch(config)# udld message time interval
Configures the time between UDLD probe messages on
ports that are in advertisement mode and are currently
determined to be bidirectional; valid values are from 1 to
90 seconds.
Note Prior to Cisco IOS Release 12.2(31)SGA, the
time interval is 7 to 90 seconds. With
Cisco IOS Release 12.2(31)SGA, the time
interval is 1 to 90 second.
The no udld message command returns the default value
(15 seconds).
Step 2
Switch# show udld type-slot/interface
Verifies the configuration.
Command Purpose
Step 1
Switch(config)# udld fast-hello interval
Configures the time between Fast UDLD probe messages
at the interface level.
Step 2
Switch# show udld fast-hello
fasttype-slot/interface
Verifies the configuration.
Command Purpose
Switch(config)# udld reset
Resets all LAN ports that have been errdisabled by
UDLD and Fast UDLD.