The fortiswitch 5203b board is an advanced telecommunications computing architecture atca compliant hubswitch board when operating in content cluster mode the fortiswitch 5203b board is session aware and can be configured with firewall policies and other fortigate configuration options the fortiswitch 5203b board itself performs firewalling stateful inspection vpn routing and other fortigate functions the fortiswitch 5203b board load balances sessions to the worker boards using weighted