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

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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

Configuration Guidelines

Loop guard works only on point-to-point links. We recommend that each end of the link has a directly

connected device that is running STP.

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

Default UDLD Configuration, page 31-4

Configuration Guidelines, page 31-4

Enabling UDLD Globally, page 31-5

Enabling UDLD on an Interface, page 31-6

Resetting an Interface Disabled by UDLD, page 31-6

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

Configuring UDLD

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Catalyst 3560-x