新华三：2025年智能无损网络技术白皮书

智能无损网络技术白皮书 Copyright © 2025 新华三技术有限公司 版权所有，保留一切权利。 非经本公司书面许可，任何单位和个人不得擅自摘抄、复制本文档内容的部分或全部，并不得以任何形式传播。 除新华三技术有限公司的商标外，本手册中出现的其它公司的商标、产品标识及商品名称，由各自权利人拥有。 本文中的内容为通用性技术信息，某些信息可能不适用于您所购买的产品。 i 目 录 1 概述 ······························································································································· 1 1.1 简介 ··························································································································· 1 1.2 产生背景······················································································································ 1 1.2.1 RDMA 的应用需求 ································································································ 1 1.2.2 数据中心硬件发展的需求 ························································································ 1 1.3 技术架构······················································································································ 1 2 流量控制技术 ··················································································································· 3 2.1 PFC 工作原理 ··············································································································· 3 2.2 PFC 死锁检测 ··············································································································· 4 2.2.1 PFC 死锁的产生 ··································································································· 4 2.2.2 触发 PFC 死锁检测 ······························································································· 5 2.2.3 PFC 死锁判定 ······································································································ 5 2.2.4 PFC 死锁恢复 ······································································································ 5 2.3 PFC 死锁预防 ··············································································································· 6 2.3.1 PFC 死锁预防的产生背景 ······················································································· 6 2.3.2 PFC 高风险业务流 ································································································ 6 2.3.3 PFC 死锁预防工作原理 ·························································································· 7 3 拥塞控制技术 ··················································································································· 8 3.1 ECN ··························································································································· 8 3.1.1 基本概念 ············································································································· 8 3.1.2 实现原理 ············································································································· 9 3.2 ECN Overlay ·············································································································· 11 3.2.1 基本概念 ·····························································