Default Udld Configuration; Configuration Guidelines - Cisco WS-C3750-48PS-S 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 26-1
Table 26-1 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

Configuration Guidelines

These are the UDLD configuration guidelines:
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Catalyst 3750 Switch Software Configuration Guide
26-4
Default UDLD Configuration, page 26-4
Configuration Guidelines, page 26-4
Enabling UDLD Globally, page 26-5
Enabling UDLD on an Interface, page 26-6
Resetting an Interface Disabled by UDLD, page 26-6
shows the default UDLD configuration.
UDLD is not supported on ATM ports.
A UDLD-capable port 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 ports
Disabled on all Ethernet 10/100 and 1000BASE-TX ports
Disabled
Chapter 26 Configuring UDLD
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