I have an ISP switch onsite (its a Cisco 2924M) that I have no physical or telnet access to. Port 1 on the ISP switch goes to the Internet. Port 2 on the ISP switch goes to my core 2950 (uplinked to another 2950) with all of my servers and users on it. Port 3 on the ISP switch goes to a brand new 3750 (stacked to another 3750) which is soon going to be my new core. I would like to eventually move all of the servers off of the 2950s and over to the 3750s, then decomission the 2950s. The problem is when I move users or servers over to the 3750s, everything becomes extremely slow. I realize that there are a lot of variables here, so I am just wondering if I could get some suggestions on places to start looking. Any suggestions of things I have not tried will be rewarded with points. As you can probably guess, I am relatively new to switching and routing so any help you could offer would be greatly appreciated.
Thank you in advance.