@SouThong : Well In a scenario of HA setup where you set up Active/Passive, The MX that is currently acting as an Passive warm spare has no traffic passing through it. This is a dynamic designation. So if you disable there should not be any impact until unless your primary MX down and failover will not be happened.    As you disable the Warm Spare configs and you need to re-enable that in order to work again. https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair  ... View more