Cisco Catalyst 4500 Series Administration Guide

32-4
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 32 Configuring UDLD
Default UDLD Configuration
Default UDLD Configuration
Table 32-1 shows the UDLD default configuration.
Configuring UDLD on the Switch
The following sections describe how to configure UDLD:
• Fast UDLD Guidelines and Restrictions, page 32-4
• Enabling UDLD Globally, page 32-5
• Enabling UDLD on Individual Interfaces, page 32-6
• Disabling UDLD on Individual Interfaces, page 32-7
• Disabling UDLD on a Fiber-Optic Interface, page 32-7
• Configuring a UDLD Probe Message Interval Globally, page 32-8
• Resetting Disabled LAN Interfaces, page 32-8
Fast UDLD Guidelines and Restrictions
When using (or configuring) Fast UDLD, consider these guidelines and restrictions:
• Fast UDLD is disabled by default.
• Configure fast UDLD only on point-to-point links between network devices that support fast UDLD.
• You can configure fast UDLD in either normal or aggressive mode.
• Do not enter the link debounce command on fast UDLD ports.
• Configure fast UDLD on at least two links between each connected network device. This reduces
the number of link disablements due to false positives.
• Fast UDLD does not report a unidirectional link if the same error occurs simultaneously on more
than one link to the same neighbor device.
• Fast UDLD is supported on a limited number of ports.
Table 32-1 UDLD Default Configuration
Feature Default Status
UDLD global enable state Globally disabled.
UDLD per-interface enable state for fiber-optic media Enabled on all Ethernet fiber-optic interfaces.
UDLD per-interface enable state for twisted-pair (copper) media Disabled on all Ethernet 10/100 and 1000BASE-TX
interfaces.
Fast UDLD per-interface enable state. Disabled on all interfaces.

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