I'm testing a web filter device that wants to run inline with the Internet traffic. The problem is I have gigabit ethernet over fiber, but the web filter wants gigabit ethernet over cat5. So, I want to use the 3550-12G (running 12.2(35)SE) as a glorified media converter. I just want to route all traffic from gi0/1 (fiber) to gi0/11 (RJ-45), and all traffic from gi0/12 (RJ-45) to gi0/2 (fiber).