Cisco Catalyst 2950 Command Reference Manual page 241

Chapter 2 Cisco IOS Commands
Neighbor echo 1 device: SAD03160954
Neighbor echo 1 port: Gi0/1
Message interval: 5
CDP Device name: 066527791
Table 2-15 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
Device name
Port ID
Neighbor echo 1 device
Neighbor echo 1 port
Message interval
1
CDP
1. CDP = Cisco Discovery Protocol
78-11381-05
device name
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 phase of the UDLD state machine. For a normal bidirectional
link, the state machine is usually 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 state. If both the local and neighbor devices are
running UDLD, the neighbor state and the local state is bidirectional.
If the link is down or the neighbor is not UDLD-capable, no cache
entries appear.
The neighbor MAC address.
The neighbor port ID enabled for UDLD.
The MAC address 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.
CDP name of the device.
Catalyst 2950 Desktop Switch Command Reference
show udld
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