If meraki sites are connected to Secure Connect via AutoVPN they will automatically be advertising to Secure Connect reachable subnets.
![Gary_Geihsler1_0-1709940065701.png Gary_Geihsler1_0-1709940065701.png](https://community.meraki.com/t5/image/serverpage/image-id/36137iDADBF451A63DD08C/image-size/medium?v=v2&px=400)
When you connect a non-meraki device via IPsec you will also define the routable subnets in the configuration. Once both tunnels are connected, you would need to enable a source-destination cloud firewall rule to allow connectivity as the default private app and network rule is a deny all. then the sites would be able to communicate with each other.