Chapter 29 Configuring UDLD

Configuring UDLD

•Enabling UDLD on an Interface, page 29-6

•Resetting an Interface Disabled by UDLD, page 29-6

Default UDLD Configuration

Table 29-1shows the default UDLD configuration.

Table 29-1

Default UDLD Configuration

 

 

 

 

Feature

 

Default Setting

 

 

UDLD global enable state

Globally disabled

 

 

UDLD per-port enable state for fiber-optic media

Disabled on all Ethernet fiber-optic ports

 

 

UDLD per-port enable state for twisted-pair (copper) media

Disabled on all Ethernet 10/100 and 1000BASE-TX ports

 

 

UDLD aggressive mode

Disabled

 

 

 

Configuration Guidelines

These are the UDLD configuration guidelines:

•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.

Caution 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-E and 3560-E Switch Software Configuration Guide

29-4

OL-9775-02

 

 

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Image 632
Cisco Systems 3750E manual Default Udld Configuration, 29-4