Cisco Catalyst 4500 Series, Software Configuration Manual

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 33 Configuring UDLD
Configuring UDLD on the Switch
Enabling UDLD on Individual Interfaces
To enable UDLD on individual interfaces, perform this task:
Command Purpose
Step 1
Switch(config-if)# udld port
Switch(config-if)# udld port aggressive
Switch(config-if)# udld fast-hello interval
Enables UDLD in normal mode on a specific interface.
On a fiber-optic interface, this command overrides the
udld enable global configuration command setting.
Enables UDLD in aggressive mode on a specific
interface. On a fiber-optic interface, this command
overrides the
udld enable global configuration command
setting.
Enables Fast UDLD on the interface with message
interval equal to the
interval value in milliseconds.
The interval value range is from 200 milliseconds to 1000
milliseconds.
To enable Fast UDLD, UDLD must be enabled
(explicitly configured or globally enabled) and
operational (in bidirectional state) on the interface.
Note
Fast UDLD can only be enabled on individual
interfaces (a global enable command does not
exist).
Note
Fast UDLD can only be configured or enabled on
a limited number of interfaces that depend on the
type of supervisor installed. The number of
supported interfaces for Fast UDLD can be
displayed with the
show udld fast-hello
command.
Step 2
Switch# show udld interface
Verifies the configuration.