Configuration Guidelines; Enabling Udld Globally - Cisco Catalyst 2360 Software Configuration Manual

Configuring UDLD
Table 19-1 Default UDLD Configuration (continued)
Feature
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.

Enabling UDLD Globally

Beginning in privileged EXEC mode, follow these steps to enable UDLD in the aggressive or normal
mode and to set the configurable message timer on all fiber-optic ports on the switch:
Command
Step 1 configure terminal
Step 2 udld {aggressive | enable | message time
message-timer-interval}
Step 3 end
Catalyst 2360 Switch Software Configuration Guide
19-4
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
Disabled on all Ethernet 10/100 and 1000BASE-TX ports
Disabled
Purpose
Enter global configuration mode.
Specify the UDLD mode of operation:
aggressive—Enables UDLD in aggressive mode on all fiber-optic
•
ports.
enable—Enables UDLD in normal mode on all fiber-optic ports on
•
the switch. UDLD is disabled by default.
An individual interface configuration overrides the setting of the
udld enable global configuration command.
For more information about aggressive and normal modes, see the
"Modes of Operation" section on page
• message time message-timer-interval—Configures the period of
time between UDLD probe messages on ports that are in the
advertisement phase and are detected to be bidirectional. The range
is from 1 to 90 seconds.
This command affects fiber-optic ports only. Use the udld
Note
interface configuration command to enable UDLD on other port
types. For more information, see the
Interface" section on page
Return to privileged EXEC mode.
Chapter 19 Configuring UDLD
19-1.
"Enabling UDLD on an
19-5.
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