I am having trouble understanding how Dell's LACP works with LAG. I mean, I do understand, but let me explain my situation. I have started at a company which has several Dell PowerConnect switches. Each floor has a core Dell switch and they all have LAG enabled on the switch. We have two newer models (Dell PowerConnect 5448 & 5324), and then some older models (PowerConnect 2748 & 2824).

The 5448 & 5324 support LACP to aggregate the ports to a LAG. However, the company is using LAG configurations between all of these switches. So between the newer models and the older models, LAG is enabled, but it is impossible to enable LACP.

What is the advantage of having all the switches have LACP enabled on the LAG configurations? Is there a problem enabling LAG between the two with LACP? Of course the 5448 & 5324 have both LACP & LAG enabled. I guess I am asking, what is the difference between having LACP enabled and not having it enabled? Especially since this network is mixed with some supporting both (which are enabled), and then the newer and older switches setup on with LAG (since LACP is not supported on the older models).