Cisco Catalyst 2960-X Command Reference Manual page 81

Layer 2 Commands
Table 6: show udld Field Descriptions
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
OL-29043 -01
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.
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
show udld
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