There is a better solution for you, Secure Connect. This is the evolution of Meraki and cloud security together. Secure Connect allows easier and more flexible ways to deploy MX sties to have the traffic inspected. Onboarding a spoke to Secure Connect does inject a default route to the spoke MX. We also can deploy MX hubs to Secure Connect which does not inject the default route. We can mimic the default route by using the Secure Connect Hubs as Exit hubs. There are flexible options how MX spokes communicate to MX hubs. Check out the Meraki Secure Connect documentation and the hub integrations here. In most cases we can move customers from Umbrella SIG to Secure Connect while retaining the same Umbrella org.
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