[Skunkworks] VLANs and FreeBSD

" Calling washington, and FreeBSD gurus, OVER " @Wash, I've not had time to work on FreeBSD and VLANs for a long while though I read thru and it seems very do-able. What do you think, with all the fiber circuits on VLANS and some on proprietory tagging, is freebsd vlans a worthwile to look at? Say eg, buy a 4 port eth card, use 2 ports for fiber circuits while use 2 others for gateway segmentation or possible load balancing. I know Cisco and the rest do it, but FreeBSD is king at networks. Then possibly run mrtg etc for graphs. ( my opinion ) What say you?