+ 0 Votes DSL on a Cisco switch CG IT Updated - 7 years ago you hooked up a DSL line from your ISP on to a switched port on a Cisco switch? what a novel approach. one would think that if the WAN ports are all used, heck just plug it in to a switched port. yeah! there ya go! Problem solved! but it doesn't work. the Switched port you connected the DSL line to needs an address [which the ISP assigns] it needs a subnet mask [which the ISP assigns] it needs a default gateway [which the ISP assigns] and it needs a DNS server [which the ISP assigns]. Then it will work. FNG!!!!! + 0 Votes Fractional T1 Lines Are Going The Way Of The Dinosaur. ron 5 years ago It's much better to just get a full blown T1 Line due to the price reductions of T1's.