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UniDirectional Link Detection (UDLD) is a protocol for detecting and disabling unidirectional Ethernet
fiber or copper links caused by mis-wiring of fiber strands, interface malfunctions, media converter faults,
and so on. The UDLD operates at Layer 2 in conjunction with IEEE 802.3 - Layer 1 fault detection
mechanisms.
UDLD is a lightweight protocol that can be used to detect and disable one-way connections before they
create dangerous situations such as Spanning Tree loops or other protocol malfunctions. The protocol is
mainly used to advertise the identities of all the UDLD-capable devices attached to the same LAN
segment and to collect the information received on the ports of each device to determine whether the
Layer 2 communication is functioning properly. All connected devices must support UDLD for the
protocol to successfully identify and disable unidirectional links. When UDLD detects a unidirectional
link, the protocol administratively shuts down the affected port and generates a trap to alert the user.
In This Chapter
This chapter describes how to configure UDLD parameters through the Command Line Interface (CLI).
CLI commands are used in the configuration examples; for more details about the syntax of commands,
see the OmniSwitch CLI Reference Guide.
Configuration procedures described in this chapter include the following:
•
"Configuring UDLD" on page
•
"Configuring the Operational Mode" on page
•
"Configuring the Probe-Timer" on page 2-7
•
"Configuring the Echo-Wait-Timer" on page 2-7
•
"Clearing UDLD Statistics" on page
•
"Verifying the UDLD Configuration" on page
•
"Verifying the UDLD Configuration" on page
OmniSwitch AOS Release 7 Network Configuration Guide
2 Configuring UDLD
2-6.
2-7.
to configure the probe-message advertisement timer.
to configure the echo-based detection timer.
2-8.
2-8.
2-8.
March 2011
page 2-1
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