Cisco Catalyst 2960 Command Reference Manual page 482

Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
Table 2-29
Field
Interface
Port enable administrative
configuration setting
Port enable operational state
Current bidirectional state
Current operational state
Message interval
Time out interval
Entry 1
Expiration time
Device ID
Current neighbor state
Device name
Port ID
Neighbor echo 1 device
Neighbor echo 1 port
Message interval
CDP device name
OL-8604-04
show udld Field Descriptions
Description
The interface on the local device configured for UDLD.
How UDLD is configured on the port. If UDLD is enabled or
disabled, the port enable configuration setting is the same as the
operational enable state. Otherwise, the enable operational setting
depends on the global enable setting.
Operational state that shows whether UDLD is actually running on
this port.
The bidirectional state of the link. An unknown state appears if the
link is down or if it is connected to an UDLD-incapable device. A
bidirectional state appears if the link is a normal two-way connection
to a UDLD-capable device. All other values mean miswiring.
The current phase of the UDLD state machine. For a normal
bidirectional link, the state machine is most often in the
Advertisement phase.
How often advertisement messages are sent from the local device.
Measured in seconds.
The time period, in seconds, that UDLD waits for echoes from a
neighbor device during the detection window.
Information from the first cache entry, which contains a copy of echo
information received from the neighbor.
The amount of time in seconds remaining before this cache entry is
aged out.
The neighbor device identification.
The neighbor's current state. If both the local and neighbor devices
are running UDLD normally, the neighbor state and local state
should be bidirectional. If the link is down or the neighbor is not
UDLD-capable, no cache entries appear.
The device name or the system serial number of the neighbor. The
system serial number appears if the device name is not set or is set to
the default (Switch).
The neighbor port ID enabled for UDLD.
The device name of the neighbors' neighbor from which the echo
originated.
The port number ID of the neighbor from which the echo originated.
The rate, in seconds, at which the neighbor is sending advertisement
messages.
The CDP device name or the system serial number. The system serial
number appears if the device name is not set or is set to the default
(Switch).
Catalyst 2960 Switch Command Reference
show udld
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