I Have three four site each site contains 1500 users , and i have servers room in each site .
and i have HQ contains ( Core switch 6509 , firewall on the same switch and some switchs .........) , i want linking these sites to server room Fiber .
the question any better in design
1- Buy the Core switch with blade Firewall to each site ,
2- Buy License firewall in Core switch in HQ to Increase the fabric of the Blade Firewall .