Using CSS GSLB with DNS

All, I have been reading up on using CSS GSLB with DNS. Here is what I can determine, please review and let me know if I am on the right path. Basically what I want is if a user goes to the VIP address, they are routed to the primary datacenter. If the primary data center is not operational, then they are routed to the secondary data center.

1. The CSS boxes become authoritative DNS servers for the zone, in this case test1.test.com. What this means is that the test1.test.com domain resides on the CSS boxes instead of on the DNS server. The DNS server would have two entries in it with the NS records saying that the CSS Primary and CSS Secondary box Circuit IP addresses owns that stub zone.

1. On the CSS Primary and Secondary boxes, you create an A record for
   formatting link
   pointing to the VIP on each CSS for that domain

So, when a user goes to

Thanks,

S. Khan