We use 12.2(50)SE ad 12.2(52)SE on 3550-48 and 3550-12G/12T successfully, as L3 aggregations. On Mar 18, 2010, at 1:02 AM, Alan Buxey wrote: > Hi, >> www.cisco.com/go/fn >> 12.2.50.SE available for 3550 even. > > beware of that one - i'm sure its only for a particular > version of the 3550 (!) > > alan