The approach works as long as each of your VLANs has a separate IP subnet associated. A good example of the concept can be found here. Tim
I am migrating to a new firewall. I'd like to migrate with both the existing and new firewall active. I have a core N3048 switch that is connected to my existing firewall. I'd like to connect my new firewall to the core switch and route one of my VLANs to the new firewall. I think I can accomplish this through Policy Based Routing. Is this correct? And if so, will configuring PBR for this VLAN affect any other VLANs or any other operations on the switch. I have 'IP Routing' configured on the switch and I plan on applying the PBR to one VLAN interface only. 
Configure Policy Based Routing on N3000