Enabling Udld Globally - Cisco Catalyst 4500 Series Software Configuration Manual
Cisco ios xe release 3.9.xe and cisco ios release 15.2(5)ex
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Also See for Catalyst 4500 Series:
- Administration manual (1814 pages) ,
- Configuration manual (1610 pages) ,
- Command reference manual (1230 pages)
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Chapter 33
Configuring UDLD
Enabling UDLD Globally
To enable UDLD in aggressive or normal mode and to set the configurable message timer on all
fiber-optic interfaces on the switch, perform this task:
Command
Step 1
Switch# configure terminal
Step 2
Switch(config)# udld {aggressive | enable |
message time message-timer-interval} | fast-hello
error-reporting
Step 3
Switch(config)# end
Step 4
Switch# show udld
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Purpose
Enters the global configuration mode.
Specifies UDLD and Fast UDLD 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
"Operation Modes" section on
page
33-3.
•
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 1 to 90 seconds.
Prior to Cisco IOS Release 12.2(31)SGA, the
Note
timer range is 7 to 90 seconds. With
Cisco IOS Release 12.2(31)SGA, the timer range
is 1 to 90 seconds.
•
fast-hello error reporting—If configured, Fast
UDLD does not errdisable a unidirectional link.
Instead, a log message informing link failure is
displayed on the console (behavior for fast UDLD
only).
Returns to privileged EXEC mode.
Verifies the configuration.
Configuring UDLD on the Switch
33-5
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