Thats the raw packet size, unfortunately. Cyrill On Mar 29, 2010, at 12:53 PM, Tom Storey wrote: > Hi all. > > The maximum configurable MTU for a 3550 series (excl 3550-12's which can do 2000) is 1546 bytes. Can anyone confirm if this is PAYLOAD size, or raw frame size? > I am interested in using a number of these in a network "upgrade" where MPLS is required. >