Setup: I have two data centers. In site1, my primary site, I'd like to deploy an AlwaysOn Failover Cluster Instance (FCI). In site2, my data recovery site, I'd like to deploy a single-node instance of SQL. I'd then like to use AlwaysOn Availability Groups (AG) to replicate data between site1 and site2.
I've read a lot of blog posts and TechNet articles. It's clear to me that automatic fail over is not supported for AGs with FCI members . It's also clear that FCIs support nodes on multiple subnets . Apparently this is achieved by updating the Virtual Network Name (VNN) in DNS.
Question: Do AGs support multiple subnets, or do I need a spanned subnet between site1 and site2? I haven't been able to find any sources that explicitly make that clear.
 Failover Clustering and AlwaysOn Availability Groups (SQL Server) http://msdn.microsoft.com/en-us/library/ff929171.aspx
 AlwaysOn Failover Cluster Instances (SQL Server) http://msdn.microsoft.com/en-us/library/ms189134.aspx