Cisco ASR-920-4SZ-D User Manual

aggressive mode, the link is considered unidirectional, and the interface is shut down. If UDLD in normal
mode is in the advertisement or in the detection phase and all the neighbor cache entries are aged out, UDLD
restarts the link-up sequence to resynchronize with any potentially out-of-sync neighbors. If you enable
aggressive mode when all the neighbors of a port have aged out either in the advertisement or in the detection
phase, UDLD restarts the link-up sequence to resynchronize with any potentially out-of-sync neighbor. UDLD
shuts down the port if, after the fast train of messages, the link state is still undetermined.
How to Configure UDLD Protocol
Enabling UDLD Protocol
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
udld {enable|aggressive}
4.
end
DETAILED STEPS
PurposeCommand or Action
Enables privileged EXEC mode.enable
Step 1
Example:
Router> enable
Enter your password if prompted.
Enters global configuration mode.configure terminal
Example:
Router# configure terminal
Step 2
Enables UDLD protocol on the router.udld {enable|aggressive}
Example:
Router(config)# udld enable
Step 3
Returns to privileged EXEC mode.end
Example:
Router# end
Step 4
LAN Switching Configuration Guide Cisco IOS XE Everest 16.5.1 (Cisco ASR 900 Series)
40
UniDirectional Link Detection (UDLD) Protocol
How to Configure UDLD Protocol

Cisco ASR-920-4SZ-D Specifications

General

Brand	Cisco
Model	ASR-920-4SZ-D
Category	Network Router
Language	English