场景说明：交换机1、交换机2组成M-LAG系统，同时作为vlan10、vlan20的双活网关，并且与sw7模拟的服务器在vlan10中运行ospf协议，同时作为根桥。交换机3、交换机4组成M-LAG系统，作为接入层。SW7在vlan10中发布地址7.7.7.7，通过vlan20访问7.7.7.7。
vlan10=192.168.10.0/24
vlan20=192.168.20.0/24

主要配置SW1：

#
 sysname CSW-1
#
ip vpn-instance Keepalive
#
ospf 1 router-id 192.168.10.253
 area 0.0.0.0
  network 192.168.10.0 0.0.0.255
#
 lldp global enable
#
vlan 1
#
vlan 10
#
vlan 20
#
stp region-configuration
 region-name ARS
 revision-level 255
 instance 1 vlan 1 to 4094
 active region-configuration
#
 stp instance 0 to 1 root primary //配置设备作为实例1、实例2的根桥
 stp global enable
#
interface Bridge-Aggregation11
 port link-type trunk
 undo port trunk permit vlan 1
 port trunk permit vlan 10 20
 link-aggregation mode dynamic
 port m-lag group 11
#
interface Bridge-Aggregation1024
 port link-type trunk
 port trunk permit vlan all
 link-aggregation mode dynamic
 port m-lag peer-link 1
#
interface Route-Aggregation1024
 ip binding vpn-instance Keepalive
 ip address 1.1.1.1 255.255.255.252
 link-aggregation mode dynamic
#
interface Vlan-interface10
 ip address 192.168.10.254 255.255.255.0
 ospf peer sub-address enable 192.168.10.253
 port m-lag virtual-ip 192.168.10.253 255.255.255.0 active //配置m-lag场景中建立邻居关系使用的子地址，两台M-LAG设备不同，而且需要配置active关键字，不配置的话，仅有m-lag的主设备地址才会生效。建议双活网关场景配置上
 mac-address 7e20-ab68-0100
#
interface Vlan-interface20
 ip address 192.168.20.254 255.255.255.0
 mac-address 7e20-ab68-0100
#
interface FortyGigE1/0/53
 port link-mode bridge
 port link-type trunk
 port trunk permit vlan all
 port link-aggregation group 1024
#
interface FortyGigE1/0/54
 port link-mode bridge
 port link-type trunk
 port trunk permit vlan all
 port link-aggregation group 1024
#
interface GigabitEthernet1/0/1
 port link-mode bridge
 port link-type trunk
 undo port trunk permit vlan 1
 port trunk permit vlan 10 20
 combo enable fiber
 port link-aggregation group 11
#
interface GigabitEthernet1/0/2
 port link-mode bridge
 port link-type trunk
 undo port trunk permit vlan 1
 port trunk permit vlan 10 20
 combo enable fiber
 port link-aggregation group 11
#
interface Ten-GigabitEthernet1/0/51
 port link-mode route
 combo enable fiber
 port link-aggregation group 1024
#
interface Ten-GigabitEthernet1/0/52
 port link-mode route
 combo enable fiber
 port link-aggregation group 1024
#
#
 m-lag mad exclude interface Route-Aggregation1024
 m-lag role priority 4096 // M-LAG的优先级，越小越优先，类似STP 默认32768
 m-lag restore-delay 180 //M-LAG系统恢复后，业务接口延迟UP的时间，防止转发黑洞使用。
 m-lag system-mac 7e20-ab68-0100 //M-LAG系统中的LACP SYSTEM-ID，两台设备一样
 m-lag system-number 1 //M-LAG系统中的DR ID，两台设备不一样，主一般为1，备一般为2
 m-lag system-priority 4096 //配置LACP协议中的优先级，两台设备一样
 m-lag standalone enable //配置独立工作模式，当Keepalive和Peer-link全部中断后，设备会采用自身的MAC作为SYSTEM-ID与其他跨设备进行链路聚合，此时对端会收到两个SYSTEM-ID，但是仅会和其中一个建立select关系，这样就避免了双主场景。
 m-lag keepalive ip destination 1.1.1.2 source 1.1.1.1 vpn-instance Keepalive
#
return

实验结果：

结论：由于采用SW7模拟多台设备，因此划分了VRF A、B，从VRF B可以访问到VRF A的7.7.7.7

后续更新：后续会更新H3C的M-LAG场景下VXLAN如何处理