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Operational State

The transmit-only link on a unidirectional port is always operationally up. Operational state is not influenced by the state of the receive-only link on that port.

Operational state of the receive-only link on a unidirectional port is independent of the state of the transmit-only link on that port. Link state for a receive-only link is determined only by the status of locally detected faults on the that link. Change in the state of the receive-only link can trigger traps, flap messages, and alarms.

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