I have a big LAN of almost 500 users, in a building of 3 levels, and I have 15 servers (MS-AD, DNS, applications ,etc) every network device is in the same VLAN (1) the default. I have cisco switches 2950 for edge switches and a CISCO 4507 for core switch. Now I have network problems , regarding to many broadcastings problems, retransmissions, etc, With all these problems I have been advised to implement VLANS in order to limit the broadcastings,,but I would like help for finding the best way for implementing VLANS,, I just want to segment the Servers,, and each IDF of each floor. I don't need to segment per users, or per applications just for avoiding broacstings.
I attach a diagram for better understanding.