The MX can not do BGP in this way - so it wouldn't work with the current network design. Typically you don't use BGP for Internet resiliency in an MX world. You use the automated failover system instead. This is likely to require a redesign in your case. https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/Connection_Monitoring_for_WAN_Failover
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