@johnpoz Thanks for the quick reply! You are correct - I do not have any intervlan traffic. Each of the offices are independent organizations so there is no need for them to communicate. In fact, I set up firewall rules so they cannot communicate.
One reason I thought that having separate interfaces would help when moving to the 1 Gbps service is that I was getting 450-460Mbps from the 600Mbps service. I initially thought this was OK because I was probably losing some throughput due to the managed switch between the router and the rooms as well as losses due to cable length. However, I started to wonder if some of the loss was due to the fact that the single interface needed to transmit VLAN tag data, using up some of its 1G capacity that would otherwise be dedicated to transmitting Internet data to the WAN. I thought that flooding the WAN with multiple 1G interfaces might keep it busier than the single interface and use more of the WAN's 1G capacity when the service was increased to 1Gbps. However, it appears that you are saying that the single interface should be able to maintain close to its 1Gbps capacity even while processing the VLAN tag data that does not go through to the WAN - is that correct?
