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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
show udld
Message interval: 5
CDP Device name: 066527791
This is an example of output from the show udld interface configuration command when the aggressive
mode is configured:
Switch# show udld gigabitethernet0/1
Interface Gi0/1
Table 2-30 show udld Field Descriptions
Field Description
Interface The interface on the local device configured for UDLD.
Port enable administrative
configuration setting
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.
Port enable operational state Operational state that shows whether UDLD is actually running on
this port.
Current bidirectional state 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.
Current operational state The phase of the UDLD state machine. For a normal bidirectional
link, the state machine is usually in the Advertisement phase.
Message interval How often advertisement messages are sent from the local device.
Measured in seconds.
Time out interval The time period, in seconds, that UDLD waits for echoes from a
neighbor device during the detection window.
Entry 1 Information from the first cache entry, which contains a copy of echo
information received from the neighbor.
Expiration time The amount of time in seconds remaining before this cache entry is
aged out.
Device ID The neighbor device identification.
Current neighbor state 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.
Device name The neighbor MAC address.
Port ID The neighbor port ID enabled for UDLD.
Neighbor echo 1 device The MAC address of the neighbors’ neighbor from which the echo
originated.
Neighbor echo 1 port The port number ID of the neighbor from which the echo originated.
Message interval The rate, in seconds, at which the neighbor is sending advertisement
messages.
CDP
1
device name
1. CDP = Cisco Discovery Protocol
CDP name of the device.
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