M-LAG技术白皮书

目录 1概述·······························································································································11.1产生背景······················································································································11.2 IRF和M-LAG对比········································································································11.3技术优点······················································································································22M-LAG技术实现··············································································································22.1 M-LAG基本概念···········································································································22.2 M-LAG网络模型···········································································································42.2.1双归接入M-LAG网络模型······················································································42.2.2单归接入M-LAG网络模型······················································································42.3 M-LAG系统建立和维护···································································································52.3.1 M-LAG系统建立及工作过程····················································································52.3.2 DRCP协议报文····································································································62.3.3 M-LAG设备角色计算·····························································································82.3.4 Keepalive机制···································································································102.3.5 MAD机制·········································································································112.3.6 M-LAG防环机制·································································································112.3.7 M-LAG表项同步机制···························································································122.3.8 M-LAG设备工作模式···························································································132.3.9配置一致性检查功能····························································································132.4 M-LAG扩展功能·········································································································142.4.1 M-LAG双活网关·································································································142.4.2 M-LAG主备模式·································································································152.4.3 M-LAG序列号校验······························································································182.4.4 M-LAG报文认证·································································································192.5流量转发····················································································································202.5.1单播流量转发·····································································································202.5.2未知单播/广播流量转发························································································232.5.3组播流量转发·····································································································242.6 M-LAG故障处理机制····································································································242.6.1 M-LAG接口故障处理机制·····················································································242.6.2 peer-link链路故障处理机制···················································································252.6.3设备故障处理机制·······························································································252.6.4上行链路故障处理机制·························································································26 2.6.5 M-LAG二次故障处理机制·····················································································263M-LAG网络中运行STP···································································································293.1 STP应用场景·············································································································293.1.1下行接入设备产生环路·························································································293.1.2多级M-LAG设备间产生的环路··············································································313.1.3初始化M-LAG配置产生环路·················································································333.1.4设备空配置重启产生环路······················································································343.2 STP在M-LAG中的工作机制·························································································344M-LAG三层网关············································································································354.1 VLAN双活网关···········································································································354.2 VRRP网关·································································································