Are you talking about MX specifically? If so, it will change practically everything, addressing the SVIs, port configurations, rules, etc. My advice is to do a test first and also do it within a maintenance window. https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/Best_Practice_Design_-_MX_Security_and_SD-WAN/MX_Templates_Best_Practices https://documentation.meraki.com/General_Administration/Templates_and_Config_Sync/Managing_Multiple_Networks_with_Configuration_Templates
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