Chapter 27 Udld Commands - Alcatel-Lucent OmniSwitch 6250 Cli Reference Manual

This chapter describes the CLI commands used to configure the UDLD (UniDirectional Link Detection)
protocol. UDLD operates at Layer 2 in conjunction with IEEE 802.3 Layer 1 fault detection mechanism. It
is a protocol used for detecting and disabling unidirectional Ethernet fiber or copper connections to avoid
interface malfunctions, Spanning Tree loops, media faults, etc. It operates in two main modes normal and
aggressive.
The two basic mechanisms that UDLD follows are:
•
Advertises port's identity and learns about its neighbors. This information is maintained in a cache
table.
•
It sends continuous echo messages when fast notifications are required.
MIB information for the UDLD commands is as follows:
Filename: AlcatelIND1UDLD.mib
Module: ALCATEL-IND1-UDLD-MIB
A summary of available commands is listed here:
udld
udld port
udld mode
udld probe-timer
udld echo-wait-timer
clear udld statistics port
interfaces clear-violation-all
show udld configuration
show udld configuration port
show udld statistics port
show udld neighbor port
show udld status port
Configuration procedures for UDLD are explained in the "Configuring UDLD" chapter of the OmniSwitch
6250 Network Configuration Guide.
OmniSwitch 6250 CLI Reference Guide
27 UDLD Commands
November 2009 page 27-1