I have 4 3750 catalyst in a MAS config. I am going to add a 3560G-48TS-S router that will be allocate to a workgroup. I have a SFP gig copper available in the 3750. I need to connect the 3750's and 3560 at 1gb. Should I add a SFP to the 3560 and connect it to the SFP in the 3750 or will it work just as good to connect to the 3750 SFP through a regular port on the 3560?