Why does an S series switch generate an error message during link aggregation configuration

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When adding an interface of an S series switch (except the S1700) to an Eth-Trunk, ensure that the interface is of the same type as the other member interfaces and the interface does not have any configurations.
Follow these guidelines:
1. Each Eth-Trunk contains a maximum of eight member interfaces by default.
2. An Eth-Trunk cannot be added to another Eth-Trunk.
3. Member interfaces of an Eth-Trunk must use the same Ethernet type and rate. Interfaces that use different Ethernet types and rates cannot join the same Eth-Trunk. For instance, GE interfaces and FE interfaces cannot join the same Eth-Trunk, but GE electrical interfaces and GE optical interfaces can join the same Eth-Trunk.

Other related questions:
An error message is displayed during the mirroring configuration on an S series switch
If an error message similar to the following is displayed when you configure the mirroring function on an S series switch: Error: Insufficient observe-port resource. It indicates that the number of configured observing ports has reached the upper limit. To perform new mirroring configuration, delete unnecessary mirroring configurations or other service configurations that use observing port resources. For example, MPLS OAM or BFD configuration consumes observing port resources on some devices. Alternatively, use other features to implement traffic monitoring.

How to configure load balancing for the Eth-Trunk on S series switches
S series switches (except the S1700) use a per-flow load balancing mechanism, which ensures that frames of the same data flow are forwarded on the same physical link, and different data flows are forwarded on different physical links. You can configure common load balancing mode to implement load balancing based on IP addresses or MAC addresses of packets. For L2, IP, and MPLS packets, you can also configure enhanced load balancing mode. Load balancing takes effect only for the outbound traffic. Therefore, load balancing modes can be different on the two ends of a link. 1. Commands for configuring common load balancing mode: [HUAWEI] interface Eth-Trunk 1 [HUAWEI-Eth-Trunk1] load-balance dst-mac 2. Commands for configuring enhanced load balancing mode: [HUAWEI] load-balance-profile a [HUAWEI-load-balance-profile-a] l2 field smac [HUAWEI-load-balance-profile-a] quit [HUAWEI] interface Eth-Trunk 1 [HUAWEI-Eth-Trunk1] load-balance enhanced profile a For configuration cases about common load balancing mode, see "Typical Ethernet Switching Configuration -Link Aggregation Configuration- Example for Configuring Link Aggregation in Manual Mode When Switches Are Directly Connected" in S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples. The configuration cases of common load balancing are applicable to all S series switch models. The Sx700 series switch is used here as an example.

Does an S series switch support link aggregation after stacking configuration
S series switches (except the S1700) support link aggregation after stacking configuration.

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