Cisco Catalyst 4500 Series Administration Guide

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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 32 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.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E