新华三：2025年负载均衡技术白皮书

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负载均衡技术白皮书
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目 录
1 概述 ······························································································································ 3
1.1 技术分类 ····················································································································· 3
1.2 技术优势 ····················································································································· 4
2 负载均衡技术实现 ············································································································ 5
2.1 服务器负载均衡技术实现 ································································································ 5
2.1.1 技术简介 ············································································································ 5
2.1.2 工作流程 ············································································································ 6
2.1.3 业务层级 ············································································································ 6
2.1.4 部署模式 ············································································································ 7
2.1.5 高可靠性 ············································································································ 9
2.2 出方向链路负载均衡技术实现 ························································································ 15
2.2.1 技术简介 ·········································································································· 15
2.2.2 工作流程 ·········································································································· 16
2.3 DNS 透明代理技术实现 ································································································· 17
2.3.1 技术简介 ·········································································································· 17
2.3.2 工作流程 ·········································································································· 18
2.3.3 设备上的业务处理流程 ························································································ 19
2.4 入链路负载均衡技术实现 ······························································································ 21
2.4.1 技术简介 ·········································································································· 21
2.4.2 工作流程 ·········································································································· 21
2.4.3 设备上的业务处理流程 ························································································ 22
2.5 全局服务器负载均衡技术实现 ························································································ 23
2.5.1 技术简介 ·········································································································· 23
2.5.2 工作流程 ·········································································································· 24
2.5.3 部署模式 ·········································································································· 26
3 负载均衡关键技术 ·········································································································· 26
3.1 调度算法 ··················································································································· 26
3.1.2 基础与静态调度算法 ··························································································· 27
3.1.3 动态与状态感知调度算法 ····················································································· 29
3.1.4 面向流量与带宽的调度算法 ·················································································· 30
3.2 健康检测 ··················································································································· 30
3.2.1 服务器健康检测 ································································································· 30
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3.2.2 链路健康检测 ···································································································· 31
3.3 负载均衡策略 ············································································································· 33
3.3.1 匹配规则 ·········································································································· 33
3.3.2 负载均衡动作 ···································································································· 33
3.3.3 会话保持 ·········································································································· 34

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