Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
udld (global configuration mode)
Command History
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 udld (interface configuration mode) command to
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
Release Modification
12.1(8a)EW Support for this command was introduced on the Catalyst 4500 series switch.
12.2(54)SG Support for Fast UDLD was added.
Command Description
show udld Displays the administrative and operational UDLD status.
udld (interface configuration
mode)
Enables UDLD and Fast UDLD on an individual interface or
prevents a fiber interface from being enabled by the udld (global
configuration mode) command.

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