1、第一步【需求分析】DS1和DS2、AS1和AS2交换机组建了多级M-LAG，DS1和DS2之间Eth-Trunk链路配置Peer-Link，交互M-LAG同步报文。在M-LAG设备之间配置V-STP破除环路。同时，在DS和CS设备上配置OSPF实现三层互通。M-LAG配置要点：以AS1和AS2组建M-LAG为例，DS设备配置类似。
2、第二步、在AS1和AS2上配置主接口的IP地址，且保证能够三层互通，专门用于M-LAG主备设备间心跳报文的传输。<AS1> system-view[~AS1] interface meth 0/0/0[~AS1-MEth0/0/0] ip address 10.1.1.1 24[*AS1-MEth0/0/0] quit---------------------------------------------<AS2> system-view[~AS2] interface meth 0/0/0[~AS2-MEth0/0/0] ip address 10.1.1.2 24[*AS2-MEth0/0/0] quit
3、第三步、在AS1和AS2上配置M-LAG的DFS Group。[*AS1] dfs-group 1[*AS1-dfs-group-1] source ip 10.1.1.1[*AS1-dfs-group-1] priority 150[*AS1-dfs-group-1] quit--------------------------------------------[*AS2] dfs-group 1[*AS2-dfs-group-1] source ip 10.1.1.2[*AS2-dfs-group-1] priority 120[*AS2-dfs-group-1] quit
4、第四步、在AS1和AS2上配置M-LAG的Peer-Link[*AS1] interface eth-tru荏鱿胫协nk 0[*AS1-Eth-Trunk0] trunkport 10ge 1/0/3[*AS1-Eth-Trunk0] trunkport 10ge 1/0/4[*AS1-Eth-Trunk0] mode lacp-static[*AS1-Eth-Trunk0] peer-link 1[*AS1-Eth-Trunk0] quit--------------------------------------------------[*AS2] interface eth-trunk 0[*AS2-Eth-Trunk0] trunkport 10ge 1/0/3[*AS2-Eth-Trunk0] trunkport 10ge 1/0/4[*AS2-Eth-Trunk0] mode lacp-static[*AS2-Eth-Trunk0] peer-link 1[*AS2-Eth-Trunk0] quit
5、第五步、在AS1和AS2上配置M-LAG的成员口[*AS1] vlan batch 11[涯箨唁峦*AS1] interface eth-trunk 20[*AS1-Eth-Trunk20] mode lacp-static[*AS1-Eth-Trunk20] port link-type trunk[*AS1-Eth-Trunk20] port trunk allow-pass vlan 11[*AS1-Eth-Trunk20] trunkport 10ge 1/0/1 to 1/0/2[*AS1-Eth-Trunk20] dfs-group 1 m-lag 1[*AS1-Eth-Trunk20] quit[*AS1] interface eth-trunk 30[*AS1-Eth-Trunk30] mode lacp-static[*AS1-Eth-Trunk30] port link-type trunk[*AS1-Eth-Trunk30] port trunk allow-pass vlan 11[*AS1-Eth-Trunk30] trunkport 10ge 1/0/5 to 1/0/6[*AS1-Eth-Trunk30] dfs-group 1 m-lag 2[*AS1-Eth-Trunk30] quit[*AS1] commit--------------------------------------------------------------------[*AS2] vlan batch 11[*AS2] interface eth-trunk 20[*AS2-Eth-Trunk20] mode lacp-static[*AS2-Eth-Trunk20] port link-type trunk[*AS2-Eth-Trunk20] port trunk allow-pass vlan 11[*AS2-Eth-Trunk20] trunkport 10ge 1/0/1 to 1/0/2[*AS2-Eth-Trunk20] dfs-group 1 m-lag 1[*AS2-Eth-Trunk20] quit[*AS2] interface eth-trunk 30[*AS2-Eth-Trunk30] mode lacp-static[*AS2-Eth-Trunk30] port link-type trunk[*AS2-Eth-Trunk30] port trunk allow-pass vlan 11[*AS2-Eth-Trunk30] trunkport 10ge 1/0/5 to 1/0/6[*AS2-Eth-Trunk30] dfs-group 1 m-lag 2[*AS2-Eth-Trunk30] quit[*AS2] commit