We just tested it on a lab that we created for this purpose (2 MX's and 2 routers to simulate the MPLS) but the plan is to move to production this week. What is important to have clear is : 1.- The MPLS has to be on the LAN of the MX. 2.- To have an SDWAN tunnel up (not ordinary VPN's) using a WAN port. 3.- To understand the purpose of each route of your table, the priority of each route and to be clear what happens when one of your routes overlap another one (the redundant one). If you are not clear about the purpose of each of your routes and how they behave in every scenario, then it could not work as it should.
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