Configuring Udld - Cisco Catalyst 3550 series 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 23-1
Table 23-1 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 3550 Multilayer Switch Software Configuration Guide
23-4
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
shows the default UDLD configuration.
UDLD is not supported on ATM interfaces.
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 23 Configuring UDLD
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