Lantronix SISPM1040-xxxx-L3 Web User Guide
33856 Rev. A https://www.lantronix.com/ 72
Port Management > UDLD > UDLD Configuration
This page lets you view and set current UDLD parameters. The Uni Directional Link Detection protocol monitors
the physical configuration of the links between devices and ports that support UDLD. It detects the existence of
unidirectional links. Its functionality is to provide mechanisms useful for detecting one way connections before
they create a loop or other protocol malfunction. IETF RFC 5171 specifies a way at the data link layer to detect
uni-directional links.
Port: Port number of the switch.
UDLD mode: Configures the UDLD mode on a port. Valid values are Disable, Normal and Aggressive. The
default mode is Disable.
Disable: In disabled mode, UDLD functionality doesn't exists on port.
Normal: In normal mode, if the link state of the port was determined to be unidirectional, it will not affect
the port state.
Aggressive: In aggressive mode, unidirectional detected ports will get shutdown. To bring back the ports
up, need to disable UDLD on that port.
Message Interval: Configures the period of time between UDLD probe messages on ports that are in the
advertisement phase and are determined to be bidirectional. The valid range is 7 - 90 seconds (the factory default
is 7 seconds). Currently only the default time interval is supported, due to lack of detailed information in IETF RFC
5171.
Buttons
Apply: Click to save changes.
Reset: Click to undo any changes made locally and revert to previously saved values.
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