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32 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 122: 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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