Hosting environments

System Center 2012 SP1 VMM introduced multi-tenancy. This is one of the most important features for hosting companies as they only need to install a single copy of System Center VMM, and then centralize their customer management, each one running in a controlled environment in their own domain. Hosters always want to maximize their compute capacity and VLAN segment hardware so you can't maximize its capacity. Network virtualization moves the isolation up to the software stack, enabling the hoster to maximize all capacity and isolate customers via software-defined networking
VMM 2012 R2 takes advantage of Windows Server 2012 R2 features, VMM 2012 R2 delivers Site-to-Site NVGRE gateway for Hyper-V network virtualization. This capability enables you to use network virtualization to support multiple Site-to-Site tunnels and direct access through a NAT Firewall. The networking virtualization (NV) uses NVGRE protocol, allowing network load balancers to act as NV gateways. Plus, switch extensions can make use of NV policies to interpret the IP information in packets being sent and communication between, for example, Cisco switches and VMM 2012 R2.