Connect the S series switches to servers by using link aggregation

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To connect a standalone or a stacked S series switch (except the S1700) to a server with dual or multiple network adapters, first configure link aggregation on interfaces of the switch. For example, to connect the S5700 to a server with dual network adapters, create an Eth-Trunk between two interfaces on the S5700 and then connect the S5700 to the server using two network cables.
You can connect a switch to a server with dual network adapters in the following modes:
1. round robin (link aggregation must be configured on the switch).
Characteristics: (1) All the links work in load balancing state and packets are transmitted on a per-packet basis to each link in round robin mode. If you ping the address 10.1.1.1 from the server, packets are transmitted on two network adapters of the server. (2) This mode improves bandwidth and supports error tolerance. If one link fails, traffic is switched to the other normal link.
2. active-backup (This mode can be applied without configuration on the switch).
Characteristics: One port works in active state and another port works in backup state. All traffic is transmitted on the active link and there is no traffic on the backup link. If the active port goes Down, the backup port changes to the active state.
3. 802.3ad (link aggregation in LACP mode needs to be configured on the switch).
4. adaptive load balancing (no configuration is required on the switch).
In this mode, you do not need to configure the switch because the two network adapters that are bound using bonding technology use different MAC addresses.

Other related questions:
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.

Principle of link aggregation on S series switches
Ethernet link aggregation , also called Eth-Trunk, bundles multiple physical links on S series switches (except the S1700) into a logical link to increase link bandwidth. The bundled links can increase the link reliability through mutual dynamic backup. Link aggregation is also called Ethernet link aggregation, port aggregation, link bundle, port bundle, Eth-Trunk, Eth-Trunk link aggregation, and interface aggregation. For more information about how link aggregation is implemented, see Link Aggregation Configuration in S1720&S2700&S5700&S6720 V200R010C00 Configuration Guide - Ethernet Switching. Link aggregation is implemented similarly on all S series switch models. The Sx700 series switch is used here as an example.

Link aggregation principle on S series switches
Ethernet link aggregation, also called Eth-Trunk, bundles multiple physical links on S series switches (except the S1700) into a logical link to increase link bandwidth. The bundled links can increase the link reliability through mutual dynamic backup. Link aggregation is also called Ethernet link aggregation, port aggregation, link bundle, port bundle, Eth-Trunk, Eth-Trunk link aggregation, and interface aggregation. For more information about how link aggregation is implemented, see Link Aggregation Configuration in S1720&S2700&S5700&S6720 V200R010C00 Configuration Guide - Ethernet Switching. Link aggregation is implemented similarly on all S series switch models. The Sx700 series switch is used here as an example.

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