Cisco Catalyst 2960-XR Configuration Guide

Enabling UDLD on an Interface, on page 172
How to Configure UDLD
Enabling UDLD Globally
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.
SUMMARY STEPS
1.
configure terminal
2.
udld {aggressive | enable | message time message-timer-interval}
3.
end
DETAILED STEPS
PurposeCommand or Action
Enters global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 1
Use the no form of this command, to disable UDLD.udld {aggressive | enable | message
time message-timer-interval}
Step 2
Specifies the UDLD mode of operation:
Example:
Switch(config)# udld enable
• 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.
message time 10
An individual interface configuration overrides the setting of the udld
enable global configuration command.
• 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; the default value is 15.
This command affects fiber-optic ports only. Use the udld
interface configuration command to enable UDLD on other port
types.
Note
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29424-01 171
Configuring UniDirectional Link Detection
How to Configure UDLD

Cisco Catalyst 2960-XR Specifications

General

Stacking Bandwidth	80 Gbps
Layer Support	Layer 2 and Layer 3
Jumbo Frame Support	9198 bytes
RAM	512 MB
Input Voltage	100-240V AC
Model	Catalyst 2960-XR
Uplink Interfaces	4 x 1G SFP or 2 x 10G SFP+
Downlink Interfaces	24 or 48 x Gigabit Ethernet ports
Power Supply	Internal
MAC Address Table Size	16, 000 entries
PoE	Available on PoE models
Weight	4.5 kg
Features	energy efficiency
Stacking	Up to 8 switches
Operating Temperature	0 to 45°C