Hi, I would use the main link - and leave the backup for the existing, willing to be decommissioned Branch/HQ when Migration comes to play, especially that should prove also the backups are working, so when your migration will move for the backup links to move, it i already proven. Would do a phased and detailed migration Plane what corresponding with your current Technologies and Sections and the future ones, like: "Existing config compare with the future Solution / one by one per each technology or protocol" WAN Cisco Routers - Meraki MX - Main Link move / adding 4G stick for check SD-WAN DNS / Vlans / DHCP / ACL / Access restrictions / L3-L7 "policies" / Blacklisting / Whitelisting then VPN what allowed and what not then moving towards down the Stack to Switches Cisco Switches - Meraki MS DNS/ Vlans/ ACL then to AP`s / Cameras / to Endpoints. All good ? - Backup link move / full decommission of existing PPDIOO with Meraki , will cost more time on research for you first, but as every Engineer knows: measure twice , do once, stand back and optimize until its perfect. 🙂 Happiness ! kajcsu
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