Functions of the load balancing algorithm on the USG6000 series


The load balancing algorithm determines how the firewall distributes service traffic to servers. An appropriate load balancing algorithm yields desired load balancing effects.

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.

SLB algorithms for the USG6000 series
The load balancing algorithm refers to the algorithm based on which the firewall allocates service traffic to the physical server. The allocation result varies with the algorithm.

Load balancing
The functions and meanings of load balancing are described as follows: When multiple routes have the same routing protocol preference and metric, these routes are called equal-cost routes, among which load balancing can be implemented. Routers support the multi-route mode, allowing you to configure multiple routes with the same destination and preference. If the destinations and costs of multiple routes discovered by the same routing protocol are the same, load balancing can be performed among the routes. Run the maximum load-balancing number command in the views of various protocols to implement load balancing. Load balancing falls into the following two modes: -Packet-by-packet When the packet-by-packet load balancing is configured, firewalls at the network layer forward packets to the same destination through various equal-cost paths. That is, switches always choose the next hop address that is different from the last one to send packets. -Session-by-session When session-by-session load balancing is configured, firewalls forward packets according to the source address, destination address, source port, destination port, and protocol contained in the packets. When the five factors are the same, firewalls always choose the same next hop address as the last one used to send the packets.

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