How to determine active interfaces among member interfaces of an Eth-Trunk in LACP mode

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When the status of member interfaces of an Eth-Trunk is different, the switch determines active interfaces according to interface priorities.
Check LACP priorities of member interfaces on the Actor. A smaller LACP priority indicates a higher priority of the member interface. By default, LACP priorities of member interfaces are 32768.
If member interfaces have the same LACP priority, check interface numbers of member interface. A smaller interface number indicates a higher priority of the member interface.

Other related questions:
How to determine the number of member interfaces in an Eth-Trunk
To ensure normal forwarding of burst traffic on an Eth-Trunk, the total bandwidth of the Eth-Trunk must be higher than the bandwidth of an interface that forwards normal traffic. To ensure that member interfaces of an Eth-Trunk evenly load balance traffic, you can use two, four, or eight member interfaces.

How to determine the actor and partner of an Eth-Trunk in LACP mode
The Actor and Partner of an Eth-Trunk in LACP mode are determined as follows: The device with a smaller system LACP priority functions as the Actor. The System Priority field and the SysPri field of the Partner in the display eth-trunk command output represent system LACP priorities of local and remote devices respectively. A smaller value indicates a higher priority. By default, the system LACP priorities of devices are both 32768. If system LACP priorities of devices at both ends of the Eth-Trunk are the same, the device with a smaller MAC address functions as the Actor. The System ID field and the System ID field of the Partner in the display eth-trunk command output represent system MAC addresses of local and remote devices respectively.

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.

How Do I Add Member Interfaces to an Eth-Trunk?
Before adding a new member interface, ensure that the type of the new member interface is the same as that of other member interfaces and there is no configuration on the new member interface. Run the shutdown command in the interface view to configure the new member interface in Down state. If the new member interface that joins the Eth-Trunk is not configured to be Down, a temporary loop may occur. As a result, services are affected. Run either of the following commands to add the new member interface to the Eth-Trunk. Run the eth-trunk trunk-id command in the interface view. Run the trunkport interface-type { interface-number1 [ to interface-number2 ] } &<1-8> command in the Eth-Trunk interface view. After member interfaces at both ends join the Eth-Trunk, run the undo shutdown command in the interface view to enable the new member interfaces.

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