This part of my setup can't change: Cable modem to 3COM 4500 (1) over copper to Gigabit port. 3COM 4500 (1) and 3COM 4500 (2) connect via fiber. 3COM 4500 (2) to 3COM 4500 (3) over copper on Gigabit port. ASUS AC88U router to 3COM 4500 (3) over copper Gigabit port. There are 3 VLANs running with appropriate tags for now. The 3COM switches only have 2 Gigabit ports. Want to send internet back from the ASUS to the switches. Currently any internet feed directly from ASUS. Question: Send Gigabit from ASUS to open 100BT port on 3COM vs. Adding a small switch to allow WAN port and LAN port from ASUS back to same 3COM Gigabit port vs. other. Note that all non-internet traffic is continuous, but small amounts of data.