Configuring Udld; Default Udld Configuration; Udld Configuration Guidelines - Cisco Catalyst 3750 Software Configuration Manual

Metro switch

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Table of Contents

Configuring UDLD

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

information:

Table 20-1 Default UDLD Configuration

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

These are the UDLD configuration guidelines:

Catalyst 3750 Metro Switch Software Configuration Guide

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

Configuring UDLD