Why don't you define a performance class and let the MX choose the best ISP automatically? There is an example for Web traffic. https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/Best_Practice_Design_-_MX_Security_and_SD-WAN/Meraki_SD-WAN#PbR_with_Performance_Failover_for_Web_traffic What is actually doing the dot1x? A switch behind the MX, an MX, an MR, something else?
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