The 3550 was designed with 10/100 and cascading in mind and the 3750 with 10/100/1000 and stacking in mind. The 3550 is built on a central switching ASIC and the 3750 is built on a number of ASICs connected to a ring.
From a user point of view, i guess the main difference is "x10".
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...