Load balancing cannot be implemented among member interfaces of an Eth-Trunk on S series switches

Cause 1: Traffic is unevenly balanced among active links of an Eth-Trunk due to the incorrect load balancing mode.
1. Run the display eth-trunk command to check whether the load balancing mode of the Eth-Trunk meets the actual networking requirements. For example, load balancing based on source and destination IP addresses is not recommended on an L2 network.
2. Run the load-balance command to set the load balancing mode that meets the traffic requirements.
Cause 2: When an Eth-Trunk interface in static LACP mode goes Up and Down frequently due to unstable physical links, LACP flapping occurs accordingly. As a result, services transmitted on the Eth-Trunk link are affected. When the LACP preemption delay is configured, LACP negotiation is not performed during the delay period; therefore. As a result, LACP flapping will not occur and services will not be affected.
You can run the lacp preempt enable command to enable the LACP preemption function and then run the lacp preempt delay delay-time command to specify the LACP preemption delay.

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