Port Management: Unidirectional Link Detection
Configuring UDLD
152 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
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STEP 2 Click Apply

Workflow2: To change the UDLD configuration of a fiber por t or to enable

UDLD on a copper port, perform the following steps:

STEP 1 Open the Port Management > UDLD Global Settings page.
a. Select a port.
b. Select either Default, Disabled, Normal or Aggressive as the port’s UDLD
status. If you select Default, the port receives the global setting.
STEP 2 Click Apply.

Workflow3: To bring a port up after it was shut down by UDLD and

automatic reactivation was not configured:

STEP 1 Open the Port Management > Error Recovery Settings page.
a. Select a port.
b. Click Reactivate.
Configuring UDLD
The UDLD feature can be configured for all fiber ports at one time (in the UDLD
Global Settings page) or per port (in the UDLD Interface Settings page).

UDLD Global Settings

The Fiber Port UDLD Default State is only applicable to fiber ports.
The Message Time field is applicable to both copper and fiber ports.
To configure UDLD globally:
STEP 1 Click Port Management > UDLD > UDLD Global Settings.
STEP 2 Enter the following fields:
•Message Time—Enter the interval between two sent UDLD messages.
This field is relevant for both fiber and copper ports.