Reference v4.1.0 Instruction Manual

568 Network OS Command Reference
53-1003115-01
protocol udld
2
protocol udld
Enables and/or enters unidirectional link detection (UDLD) protocol configuration mode.
Synopsis protocol udld
no protocol udld
Operands None
Defaults This protocol is disabled by default.
Command Modes Global configuration mode
Description UDLD detects and blocks a physical link that becomes unidirectional. A unidirectional link can
cause traffic in a network to loop endlessly. When the link becomes bidirectional again, UDLD
unblocks the link.
Usage Guidelines This protocol applies only to physical ports. In addition to running this command, you must also
enable each desired port for UDLD in interface subconfiguration mode.
Use the no protocol udld command to disable the UDLD protocol and revert all UDLD configuration
to defaults.
Examples To enable the unidirectional link detection (UDLD) protocol:
switch# configure
switch(config)# protocol udld
See Also hello (UDLD), udld enable, shutdown (UDLD)