I'm looking at different ways of putting in a new subnet to one of our buildings getting ready for it's move to our new MPLS network. It's currently residing on a massive switched network controlled by a couple of MSFCs. This is part of the project of dismantling that network. One method I'm looking at is installing the 3550 that they're going to get anyway and using that to handle the new subnet locally but still be able to route to the existing VLAN devices in the building. The way I was thinking of doing it, having looked at other routing devices on our network, was:
1) Drop the 5500s in the building to VTP mode transparent. 2) Create a new VLAN 500 on each 5500. 3) Install a 3550 and connect it to the 5500 that has the lines out of the building. 4) Create a sub-interface F0/n.1 with a VLAN 1 address for the corporate management VLAN and include 'encapsulation dot1q 1'. 5) Create another sub-interface F0/n.500 with a gateway address for the new VLAN and include 'encapsulation dot1q 500'. 6) Enable EIGRP on the 3550 and distribute connected.In theory, the VLAN1 address would see the MSFC and share routing tables, picking up the existing corporate VLANs in the building and allow the MSFC to see the local building VLANs... I think...
Could it really be that simple? Am I missing something? Another option would be to create the VLAN on the MSFC but I don't want to go down that road.