In which link aggregation mode will Huawei switches implement link backup?

B

LACP uses the LACP protocol to negotiate parameters and determine active and inactive interfaces. In LACP mode, you must manually create an Eth-Trunk and add member interfaces to the Eth-Trunk. LACP determines active and inactive interfaces by negotiating parameters through LACPDUs.

The LACP mode is called M:N mode. The LACP mode can implement load balancing and backup. In a link aggregation group (LAG), M links are in active state. They forward data and implement load balancing. The other N links are in inactive state and do not forward data. When a link among the M links is faulty, the link with the highest priority among the N links are selected to replace the faulty link. This link enters the active state and starts to forward data.

Figure 1-3  LACP mode

Difference between LACP and manual load balancing: LACP has backup links. In manual load balancing mode, all member interfaces are in forwarding state.

If both devices support LACP, link aggregation in LACP mode is recommended.

https://support.huawei.com/enterprise/en/doc/EDOC1000017271/94b49ef9/link-aggregation-features-supported-by-the-switch

Hi simon.waweru,
The answer is B.