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15 UniDirectional Link Detection
Commands
The switch can be configured to detect and disable unidirectional Ethernet fiber or
copper links. When enabled, the protocol advertises a port’s identity and learns
about its neighbors on a specific LAN segment; and stores information about its
neighbors in a cache. It can also send out a train of echo messages under
circumstances that require fast notifications or re-synchronization of the cached
information.
udld message-interval This command configures the message interval between UDLD probe messages for
ports in advertisement phase and determined to be bidirectional. Use the no form
to restore the default setting.
Syntax
udld message-interval message-interval
no message-interval
message-interval – The interval at which a port sends UDLD probe
messages after linkup or detection phases. (Range: 7-90 seconds)
Default Setting
15 seconds
Command Mode
Global Configuration
Command Usage
During the detection phase, messages are exchanged at the maximum rate of one
per second. After that, if the protocol reaches a stable state and determines that the
link is bidirectional, the message interval is increased to a configurable value based
on a curve known as M1(t), a time-based function described in RFC 5171.
Table 85: UniDirectional Link Detection Commands
Command Function Mode
udld message-interval Configures the message interval between UDLD
probe messages
GC
udld aggressive Sets UDLD to aggressive mode on an interface IC
udld port Enables UDLD on an interface IC
show udld Shows UDLD configuration settings and operational
status
PE
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