Default Udld Configuration; Configuration Guidelines - Cisco 3845 - Security Bundle Router Software Manual

Configuring UDLD

Default UDLD Configuration

Table 22-1
Table 22-1 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

•
•
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.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
22-4
shows the default UDLD configuration.
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 22 Configuring UDLD
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