Interfaces and Hardware Component Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases
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Interfaces and Hardware Component Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases
Updated: September 8, 2026
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Log inThis topic describes how to configure the Unidirectional Link Detection (UDLD) protocol on a physical ethernet interface, and optionally set the mode of operation, message time, and syslog message suppression for the interface.
UDLD is configured for each interface. The interface must be a physical ethernet interface.
Perform these steps to configure UDLD protocol on an interface.
Enter global configuration mode.
Router# configureUse the interface [GigabitEthernet | TenGigE] interface-path-id command. Enter interface configuration mode and specify the Ethernet interface name and notation rack/slot/module/port.
Router(config)# interface TenGigE 0/1/0/0NoteThe example indicates an 8-port 10-Gigabit Ethernet interface in modular services card slot 1.
Enable ethernet UDLD functionality and enters interface Ethernet UDLD configuration mode.
Router(config-if)# ethernet udldUse the mode{ normal |aggressive} command to specify the mode of operation for UDLD. The options are normal and aggressive.
Router(config-if-udld)# mode normalUse the message-time [7-90] command to specify the message time (in seconds) to use for the UDLD protocol. The value ranges from 7 to 90 seconds.
Router(config-if-udld)# message-time 70Suppress the operational UDLD syslog messages.
Router(config-if-udld)# logging disableEnd the configuration session and exits to the EXEC mode.
Router(config-if-udld)# endNeed help?
(Requires a Cisco Service Contract)
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