How to rectify the unidirectional communication fault on Eth-Trunk of S series switches

The following features enable you to rectify the unidirectional communication fault on Eth-Trunks of S series switches (except the S1700):
1. 3AH: Monitor the link connectivity through 3AH. If a unidirectional communication fault occurs, the feature ensures the two ends of a link are in the same state.
2. LACP: LACP ensures the same status between the two ends of the Eth-trunk through exchanges of LACPDUs. If a unidirectional communication fault occurs, LACP can detect the fault on time and transfer the selected state to the other side, preventing traffic loss caused by the unidirectional communication fault.
Notes:
S series switches (except the S1700) running V100R005 and later versions support the device link detection protocol (DLDP). DLDP can monitor the link status of fibers or copper twisted pairs. If DLDP detects a unidirectional link, it automatically closes the relevant port or notifies the user to close the port, depending on the user configuration. This prevents network faults.

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