I tested this with MX250 in 2018 and if I recall it did not work. It was on a very different code from 18.107.x currently being used. Meraki did not have Active/Active tunnels on ISP1 and ISP2 back then.  This was in a lab and shut down the uplink switch port that was ‘ISP-1’ on MX-A. SD-WAN traffic stopped. I had to failover MX in the dashboard, and then tunnels connected on MX-B. I don’t recall if the Internet kept working. ... View more