Hi I'm planning to buy AFL licenses for my 2xEX8200 + 2xXRE200 (VirtualChassis) setup. Do you need to buy : 2 x EX-XRE200-AFL 2 x EX8208-AFL or just is enough as I'm running setup with XRE/VirtualChassis 2 x EX-XRE200-AFL ? Rob