Hello, For your migration challenge, I propose two solutions without relying on third-party VPN peers: 1. Dynamic Routing Solution: - Implement OSPF or eBGP between the L3 device, old MX, and new MX at the hub. - Configure the L3 device to redistribute routes, ensuring both MXs are aware of each other's subnets. - As spokes are migrated, the new MX dynamically advertises updated subnets to the L3 device, maintaining seamless connectivity. 2. Static Routing Alternative: - Place the old and new MXs in the same VLAN for direct communication. - On the new MX, create a summary route pointing to the old MX to handle traffic for all spokes, adjusting the metric accordingly. - As spokes are migrated, add specific static routes on the old MX for corresponding subnets, directing traffic to the new MX. - Document routing changes thoroughly, communicate adjustments to the team, and regularly test connectivity during the migration. - Once all sites are migrated, remove the summary route and unnecessary static routes from the old MX to complete the transition. I think those solutions ensure a controlled and organized migration process without relying on external VPN peers. Feel free to ask if I overlook something!
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