Prioritize WAN over LAN

Product Discussion
1

I have a radio mesh LAN with a Max BR 2 Pro at one radio node to provide a wired WAN gateway connection to a data center. Another of the radio nodes also has a Max BR 2 Pro that provides a WiFi WAN connection as an alternate gateway for devices hosted at that node.

The node with the WiFi WAN is currently configured to use the 2 gateways, if either connection is down the router automatically routes traffic through the active connection. However, if both the WiFi WAN and mesh radio LAN connections are active, the default route for traffic to the data center is over the mesh radio LAN to the router with the wired WAN gateway.

How do I configure the router to use the WiFi WAN as default? Setting an Outbound Policy (assuming I’ve done it correctly) does not seem to effect this behavior.

Connecting the mesh radio network to the WAN port is not an option as the node needs to send and receive multicast data to/from the other mesh radio nodes.

2 
                     Data Center
                         ▲
                         │
                   Routed network
                         │
                    Wired WAN
                         │
                  ┌────────────┐
                  │ BR2 Pro #1 │
                  └─────┬──────┘
                        │ LAN
                        │
                   Radio Mesh LAN 
                        │
                    Radio Node
                        │ LAN
                  ┌─────┴──────┐
                  │ BR2 Pro #2 │
                  └─────┬──────┘
                        │
                Wi-Fi WAN ───────► Alternate path
  1. The above is the setup ?
  2. How BR2 Pro #2 learns the route to the Data Center via the mesh LAN—for example, a static route, OSPF, or another router on the mesh ?
3

Hopefully this helps explain my problem better.

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When radio 2 is connected to the mesh network, all traffic from clients 1 & 2 go through router 1 to the WAN. I would like their WAN traffic to go through router 2’s WiFi connection.