Enterprise Roaming with high capacity

Dear all,

I have implemented an enterprise wireless network consist of 12 sites point to point with Rocket M5 .
each site with basebox two connected to LCOM antenna.

Now I need roaming which comes from LAN side not WLAN. because the speed is very important. up to 2000 users use the packages of 10Mbps.
Thus I need your help on how to configure roaming which comes from LAN interface.

Regards,
Baqer