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

Configuring UDLD

Configuring UDLD
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Default UDLD Configuration

Table 31-1 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

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Loop guard works only on point-to-point links. We recommend that each end of the link has a directly
Caution
connected device that is running STP.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
31-4
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
Disabled
Chapter 31 Configuring UDLD
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