Enabling Udld Globally - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 23 Configuring UDLD

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 interfaces on the switch:
Command
Step 1 configure terminal
Step 2
udld {aggressive | enable | message time
message-timer-interval}
Step 3 end
Step 4 show udld
Step 5
copy running-config startup-config
To disable UDLD globally, use the no udld enable global configuration command to disable normal
mode UDLD on all fiber-optic ports. Use the no udld aggressive global configuration command to
disable aggressive mode UDLD on all fiber-optic ports.
Enabling UDLD on an Interface
Beginning in privileged EXEC mode, follow these steps to enable UDLD in the aggressive or normal
mode on an interface:
Command
Step 1
configure terminal
Step 2
interface interface-id
78-11194-09
Purpose
Enter global configuration mode.
Specify the UDLD mode of operation:
• aggressive—Enables UDLD in aggressive mode on all fiber-optic
interfaces.
• enable—Enables UDLD in normal mode on all fiber-optic
interfaces 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 determined to be bidirectional. The
range is from 7 to 90 seconds.
This command affects fiber-optic interfaces only. Use the udld
Note
interface configuration command to enable UDLD on other
interface types. For more information, see the
on an Interface" section on page
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface to be
enabled for UDLD.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring UDLD
23-1.
"Enabling UDLD
23-5.
23-5