Configuring Udld; Default Udld Configuration; Configuration Guidelines - Cisco Catalyst 2950 Software Configuration Manual

Configuring UDLD

Configuring UDLD
This section describes how to configure UDLD on your switch. It contains this configuration
information:
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Default UDLD Configuration

Table 22-1
Table 22-1 Default UDLD Configuration
Feature
UDLD global enable state
UDLD per-interface enable state for fiber-optic media
UDLD per-interface enable state for twisted-pair (copper)
media
UDLD aggressive mode

Configuration Guidelines

These are the UDLD configuration guidelines:
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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
22-4
Default UDLD Configuration, page 22-4
Configuration Guidelines, page 22-4
Enabling UDLD Globally, page 22-5
Enabling UDLD on an Interface, page 22-6
Resetting an Interface Shut Down by UDLD, page 22-6
shows the default UDLD configuration.
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.
Default Setting
Globally disabled
Disabled on all Ethernet fiber-optic interfaces
Disabled on all Ethernet 10/100 and 1000BASE-TX
interfaces
Disabled
Chapter 22 Configuring UDLD
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