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······················································································································22 M-LAG技术实现··············································································································12.1 M-LAG基本概念···········································································································12.2 M-LAG网络模型···········································································································22.2.1双归接入M-LAG网络模型······················································································22.2.2单归接入M-LAG网络模型······················································································22.3 M-LAG系统建立和维护···································································································32.3.1 M-LAG系统建立及工作过程····················································································32.3.2 DRCP协议··········································································································42.3.3 Keepalive机制·····································································································52.3.4 MAD机制···········································································································52.3.5 M-LAG防环机制···································································································62.3.6 M-LAG表项同步机制·····························································································72.3.7 M-LAG设备工作模式·····························································································82.3.8配置一致性检查功能······························································································82.3.9 M-LAG双活网关···································································································92.3.10 M-LAG序列号校验····························································································102.3.11 M-LAG报文认证·······························································································102.4流量转发····················································································································112.4.1单播流量转发·····································································································112.4.2未知单播/广播流量转发························································································152.4.3组播流量转发·····································································································162.5 M-LAG故障处理机制····································································································162.5.1 M-LAG接口故障处理机制·····················································································162.5.2 peer-link链路故障处理机制···················································································172.5.3设备故障处理机制·······························································································172.5.4上行链路故障处理机制·························································································182.5.5 M-LAG二次故障处理机制·····················································································18 3 M-LAG网络中运行STP·····································································································1 3.1 STP应用场景···············································································································13.1.1下行接入设备产生环路···························································································13.1.2多级M-LAG设备间产生的环路················································································23.1.3初始化M-LAG配置产生环路···················································································43.1.4设备空配置重启产生环路························································································53.2 STP在M-LAG中的工作机制···························································································5 4.1 VLAN双活网关·············································································································14.2 VRRP网关···················································································································3 5 M-LAG网络中运行环路检测·······························································································1 5.1功能简介······················································································································15.2工作机制······················································································································15.2.1普通组网下的M-LAG设备环路检测工作机制·····························