Help Center/ Elastic Load Balance/ FAQs/ Backend Servers/ How Load Balancing Algorithms and Sticky Session Type of a Backend Server Group Are Related?

Updated on 2025-08-30 GMT+08:00

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How Load Balancing Algorithms and Sticky Session Type of a Backend Server Group Are Related?

Table 1 and Table 2 list the sticky session types and load balancing algorithms supported by a backend server group.

**Table 1** Sticky session types supported by dedicated load balancers
Backend Server Group Protocol	Load Balancing Algorithm	Sticky Session Type
TCP UDP	Weighted round robin	Source IP address
	Weighted least connections	Source IP address
	Source IP hash	Not supported
HTTP HTTPS gRPC	Weighted round robin	Load balancer cookie Application cookie
	Weighted least connections	Load balancer cookie Application cookie
	Source IP hash	Not supported NOTE: If you set Load Balancing Algorithm to Source IP hash, you do not need to manually enable and configure Sticky Session. Source IP hash allows requests from the same client to be directed to the same server.
QUIC	Connection ID	Source IP address

**Table 2** Sticky session types supported by shared load balancers
Backend Server Group Protocol	Load Balancing Algorithm	Sticky Session Type
TCP UDP	Weighted round robin	Source IP address
	Weighted least connections	Source IP address
	Source IP hash	Not supported NOTE: If you set Load Balancing Algorithm to Source IP hash, you do not need to manually enable and configure Sticky Session. Source IP hash allows requests from the same client to be directed to the same server.
HTTP	Weighted round robin	Load balancer cookie Application cookie
	Weighted least connections	Load balancer cookie Application cookie
	Source IP hash	Not supported NOTE: If you set Load Balancing Algorithm to Source IP hash, you do not need to manually enable and configure Sticky Session. Source IP hash allows requests from the same client to be directed to the same server.

Parent topic: Backend Servers

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