Cisco Small Business 200 Series Administration Manual page 141

Port Management: Unidirectional Link Detection
Configuring UDLD
- Disabled—UDLD is disabled on all ports of the device.
- Normal—Device shuts down an interface if the link is unidirectional. If the link is undetermined, a
notification is issued.
- Aggressive—Device shuts down an interface if the link is uni-directional. If the link is bi-
directional, the device shuts down after the UDLD information times out. The port state is marked
as undetermined.
STEP 3
UDLD Interface Settings
Use the UDLD Interface Settings page to change the UDLD state for a specific port. Here the state can be
set for copper or fiber ports.
To copy a particular set of values to more than one port, set that value for one port and use the Copy button
to copy it to the other ports.
To configure UDLD for an interface:
STEP 1
Information is displayed for all ports on which UDLD is enabled, or, if you have filtered only a certain group of
ports, information is displayed for that group of ports.
• Port—The port identifier.
• UDLD State—The possible states are:
- Disabled—UDLD is disabled on all fiber ports of the device.
- Normal—Device shuts down an interface if it detects that the link is unidirectional. It issues a
notification if the link is undetermined.
- Aggressive—Device shuts down an interface if the link is uni-directional. If the link is bi-
directional, the device shuts down after the UDLD information times out. The port state is marked
as undetermined.
• Bidirectional State—Select the value of this field for the selected port. The possible states are:
- Detection—The latest UDLD state of the port is in the process of being determined. Expiration
time has not yet expired since the last determination (if there was one), or since UDLD began
running on the port, so that the state is not yet determined.
- Bidirectional—Traffic sent by the local device is received by its neighbor, and traffic from the
neighbor is received by the local device.
Cisco Small Business 200 Series Smart Switch Administration Guide
Click Apply to save the settings to the Running Configuration file.
Click Port Management > UDLD > UDLD Interface Settings.
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