Name: Cisco 2950 - Catalyst Switch
Brand: Cisco
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23-4

Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide

78-11380-10

Chapter 23 Configuring UDLD

Configuring UDLD

This section describes how to configure UDLD on your switch. It contains this configuration

information:

• Default UDLD Configuration, page 23-4

• Configuration Guidelines, page 23-4

• Enabling UDLD Globally, page 23-5

• Enabling UDLD on an Interface, page 23-5

• Resetting an Interface Shut Down by UDLD, page 23-6

Default UDLD Configuration

Table 23-1 shows the default UDLD configuration.

Configuration Guidelines

These are the UDLD configuration guidelines:

• A UDLD-capable interface also cannot detect a unidirectional link if it is connected to a

UDLD-incapable port of another switch.

• When configuring the mode (normal or aggressive), make sure that the same mode is configured on

both sides of the link.

Table 23-1 Default UDLD Configuration

Feature Default Setting

UDLD global enable state Globally disabled

UDLD per-interface enable state for fiber-optic media Disabled 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

UDLD aggressive mode Disabled

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Cisco 2950 - Catalyst Switch Specifications

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