Subscriber Services: DHCPv6 subscriber identification criteria and automatic logout

The DHCPv6 local server and the DHCPv6 relay agent can identify a DHCPv6 client by using the incoming-interface option in addition to the client identifier. The incoming interface allows only one client device to connect on the interface. If the client device changes-that is, if DHCPv6 receives a solicit message from a client whose incoming interface matches the existing interface-DHCPv6 automatically logs out the existing client without waiting for the normal lease expiration. It deletes the existing client binding and creates a binding for the newly connected device.