When DLDP detects a unidirectional fiber link, Huawei devices perform the following operations by default: The DLDP state machine changes to the Disable state; a trap is generated; the interface is automatically blocked.

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Huawei's DLDP (Device Link Detection Protocol) is designed to detect unidirectional links and, by default, it changes the state to Disable, generates a trap, and blocks the interface to prevent network issues.

When DLDP Detects a Unidirectional Fiber Link, Huawei Devices Perform