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Site with two paths to another site

Dear all,

 

My theory is simple and not complicated.

 

I have two sites (HQ and BR) that are connected together using WiMAX. The BR site gets IP addresses from a DHCP server in HQ site and accesses resources (such as shares, internet, ..etc) in the HQ site. Sometimes the WiMAX goes down, as a result both sites lose connection and become isolated. I deployed an IPSec L2L VPN between the sites as a backup path. When the WiMAX goes down, users' traffic goes through the VPN tunnel.

Now, i want users to use the WiMAX as a primary connection and the VPN as secondary. But how can i do that?

When both the WiMAX and VPN are up, how can i tell which path the traffic is forwarded to? Both paths forwards DHCP leases to user from HQ's DHCP server.

I want to assign a cost so that users prefer the WiMAX and then the VPN when WiMAX is down.

And which switch device should i assign this cost?

 

The scenario doesn't involve in router devices. It's all pure LAN switching and 2 firewalls.

Unfortunately, i don't have access to drawn network layout but let me know if you need me to draw it for you.

 

Thanks