Cisco 500 Series Administration Manual page 213

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- Disabled—UDLD has been disabled on this port.
- Shutdown—The port has been shut down because its link with the
connected device is undetermined in aggressive mode.
• Neighbor Expiration Time (Sec.)—Displays the time that must pass before
the device attempts to determine the port UDLD status. This is three times
the Message Time.
• Neighbor Message Time (Sec.)—Displays the time between UDLD
messages.
Port Management: Unidirectional Link Detection
Cisco 500 Series Stackable Managed Switch Administration Guide
Configuring UDLD