I currently have a 1604 routing all traffic from one campus down a pt-pt. Behind the 1604 is 5 3550's. All 3550's are configured with and IP address on VLAN 1. All ports are default configuration. I would like to create a management VLAN and start Inter-VLAN routing using the first 3550 after the 1604 to do the Inter-VLAN routing. I know I need to turn on ip routing on that switch and create the VLAN in layer 2 (vlan 250, name) and in layer 3 (give it IP address). Do I have to turn on ip routing on the other connected switches or just tell them default gateway is the first switch with ip routing enabled and do have to make the switchport connected to the 1604 a routed port or will communication stop until I do make it a routed port. Kind of long winded but it's a live network and I have no lab to try this stuff in. People from another campus access some servers on this network 24 hours a day via terminal services and I don't want to break any communication during the change (if possible). Thanks.