Default Udld Configuration - Cisco Catalyst 3750-E Software Configuration Manual

Configuring UDLD
Configuring UDLD
•
•
•
•
•

Default UDLD Configuration

Table 29-1 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
•
•
•
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-E and 3560-E Switch Software Configuration Guide
29-4
Default UDLD Configuration, page 29-4
Configuration Guidelines, page 29-4
Enabling UDLD Globally, page 29-5
Enabling UDLD on an Interface, page 29-6
Resetting an Interface Disabled by UDLD, page 29-6
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 29 Configuring UDLD
OL-9775-08