The core network will be the backbone of the lab environment. The core network will connect each local test network with each other allowing them to cooperate and communicate. To allow connectivity between the different networks, the core network will consist of six routers from Extreme, Cisco and Juniper. The communication between the test networks is done by using IPv4 and IPv6; the same protocols used to allow communication between core network routers and outside the network. The Internet uplink is provided by the University of Amsterdam (UvA) and will provide an connection to the Internet. This is done by allowing the router connected to the UvA network to forward IPv4 and IPv6 information to the UvA experimental network of the Master SNE.
The main challenge in the test is to connect the different routers in order to establish the communication for the Interoperability Lab networks over the core network. This is due to the different protocols and applications each network uses to generate traffic over the core network. The routers will be interconnected with optic fiber or if need be both fiber and Ethernet.
The result will be an interoperable core network. Each local test newtork will be able to communicate with the core network and in return the core network will be able to perform test on the local test networks.

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IPv6-scheme Core Network