Configuring Udld; Default Udld Configuration; Udld Configuration Guidelines - Cisco Catalyst 3750 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 20-1
Table 20-1 Default UDLD Configuration
Feature
UDLD global enable state
UDLD per-port enable state for fiber-optic media
UDLD per-port enable state for twisted-pair (copper) media
UDLD aggressive mode

UDLD Configuration Guidelines

These are the UDLD configuration guidelines:
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Catalyst 3750 Metro Switch Software Configuration Guide
20-4
Default UDLD Configuration, page 20-4
UDLD Configuration Guidelines, page 20-4
Enabling UDLD Globally, page 20-5
Enabling UDLD on an Interface, page 20-5
Resetting an Interface Disabled by UDLD, page 20-6
shows the default UDLD configuration.
UDLD is not supported on ATM ports.
A UDLD-capable interface also cannot detect a unidirectional link if it is connected to a
UDLD-incapable interface 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 ports
Disabled on all Ethernet 10/100 and 1000BASE-TX ports
Disabled
Chapter 20 Configuring UDLD
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