Configure link aggregation among cards on S series switches.

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Note the following when you configure link aggregation on S series modular switches:
1. Interfaces of different Ethernet types or rates cannot be added to the same Eth-Trunk. For example, you cannot add GE interfaces and FE interfaces to the same Eth-Trunk, but you can add GE electrical interfaces and GE optical interfaces to the same Eth-Trunk.
2. The two ends of the Eth-Trunk must use the same number of interfaces, interface rate, duplex mode, and flow control configuration.
3. The remote interfaces directly connected to the local Eth-Trunk member interfaces must also be added to an Eth-Trunk; otherwise, the two ends cannot communicate.
4. When you connect the two devices, ensure the link aggregation modes on the two devices are the same.
5. There are strict limitations in link aggregation between boards.

For more information about link aggregation configuration, see: Ethernet Switching-Link Aggregation in the S7700&S9700 Product Use Precautions.
Ethernet Switching-Link Aggregation in the S9300&S9300E&S9300X Product Use Precautions.
Ethernet Switching-Link Aggregation in the S12700 Product Use Precautions.

Other related questions:
Do S series switches support inter-card link aggregation
Link aggregation configuration has no restrictions on the card specifications of S series modular switches. Inter-card link aggregation is supported on S series modular switches. For the detailed requirements, see the right pane.

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.

Commands to configure link aggregation on S series switches
S series switches (except the S1700) implement link aggregation by using commands. Different commands have different functions. For example: interface eth-trunk: //Create an Eth-Trunk interface and enter the interface view. mode: //Configure the working mode of the Eth-Trunk. trunkport: //Add member interfaces to the Eth-Trunk. For more commands about link aggregation, see "Ethernet Switching Configuration Commands-Link Aggregation Commands" in S1720&S2700&S5700&S6720 V200R010C00 Command Reference. Link aggregation commands are applicable to all S series switch models. The Sx700 series switch is used here as an example.

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