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You are here: Home / SWITCH / Module 3 / 802.1D Spanning Tree Protocol – Unidirectional Link Detection (UDLD)

802.1D Spanning Tree Protocol – Unidirectional Link Detection (UDLD)

Unidirectional Link Detection (UDLD) is a Layer 2 protocol designed to detect unidirectional link failures. UDLD performs tasks that Layer 1 mechanisms, such as auto negotiation, cannot perform. These tasks include detecting the identities of neighbors and shutting down misconnected ports. When UDLD and auto-negotiation are enabled, both Layer 1 and Layer 2 detections work together to prevent physical and logical unidirectional connections and the malfunctioning of other protocols.

UDLD exchanges protocol packets between the neighboring switches. These messages are sent out every 15 seconds. If the messages are echoed back within a specific timeframe but they lack specific . . .

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