I am not familiar with Comcast EDI/ENS. Is this a layer 2 or 3 service? In either case, I will refer to it as a WAN. For this kind of configuration, you connect the WAN to the Internet. You could do this by doing that at one location, or by buying such a service from Comcast on the EDI directly. You'll use this topology, except you don't need an Internet connection for the branch. https://documentation.meraki.com/MX/Site-to-site_VPN/Configuring_Site-to-site_VPN_over_MPLS > Goal is to configure Site A and Site B in a failover setup to provide internet to all sites in case of an outage at either location. This would only be possible if sites A and B were adjacent in layer 2.
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