Cisco Catalyst 250 Series Command Reference

DescriptionField
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).
Device name
The neighbor port ID enabled for UDLD.Port ID
The device name of the neighbors’ neighbor from
which the echo originated.
Neighbor echo 1 device
The port number ID of the neighbor from which the
echo originated.
Neighbor echo 1 port
The rate, in seconds, at which the neighbor is sending
advertisement messages.
Message interval
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).
CDP device name
This is an example of output from the show udld neighbors command:
Switch# show udld neighbors
Port Device Name Device ID Port-ID OperState
-------- -------------------- ---------- -------- --------------
Gi2/0/1 Switch-A 1 Gi2/0/1 Bidirectional
Gi3/0/1 Switch-A 2 Gi3/0/1 Bidirectional
Related Commands
DescriptionCommand
Enables aggressive or normal mode in UDLD or sets the configurable message
timer time.
udld
Enables UDLD on an individual interface or prevents a fiber-optic interface from
being enabled by the udld global configuration command.
udld port
Resets all interfaces shut down by UDLD and permits traffic to pass through again.
udld reset
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
76 OL-29043 -01
Layer 2 Commands
show udld

Cisco Catalyst 250 Series Specifications

General

Brand	Cisco
Model	Catalyst 250 Series
Category	Switch
Language	English