I used this document to config - https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair In short: i have switch with vlans configured vlan10 - ISP (ports 1,2,3) vlan 20 LAN on vlan 10 i put ISP media convertor or router (depend how is terminated) - port1 wan1 on MX1 is connected with cable to switch in vlan10 - port2 wan1 on MX2 is connected with cable to switch in vlan10 - port3 All IP addresses from ISP are in same subnet - both for MX's and virtual ip Port 3 on the MX is connected to swich in vlan20 - internal network Port3 also have vlan configured with gateway from internal network
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