System and method for implementing a virtual backbone on a common network infrastructure

A network system configured to carry data, comprising:

• a virtual backbone;
• a plurality of network control points, each network control point having at least one network control point device, which is connected to the virtual backbone and configured to enforce a network security policy of a known network;
• a plurality of known networks, each known network is connected to at least one of the plurality of network control point devices and has a network security policy;
• and
• a plurality of unknown networks, each unknown network is connected to at least one of the plurality of network control point devices, and having no network security policy.

A network system configured to carry data, comprising:

• first and second known networks;
• first and second virtual backbones, each virtual backbone having an address registry, which includes addresses corresponding to network devices in the first and second known networks;
• a first network control point configured to connect the first known network to the first virtual backbone and configured to enforce a network security policy of the first known network;
• a second network control point configured to connect the second known network to the second virtual backbone and configured to enforce a network security policy of the second known network;
• a third network control point configured to connect to the first virtual backbone and configured to enforce source address integrity for the first and second virtual backbones;
• and
• a fourth network control point configured to be coupled to the third network control point and the second virtual backbone and configured to enforce source address integrity for the first and second virtual backbones.