The present disclosure relates to a technique for forwarding frames received by a network interconnect node (114) of an internal network (112) having the network interconnect node (114), one or more internal network nodes (118, 120) and one or more other internal network interconnect nodes (116), the network interconnect node (114) having a network interconnect interface for communicating with an external network interconnect node (104) of an external network (102) and a network interface for communicating with one or more of the other internal network interconnect nodes (116) and with one or more of the internal network nodes (118, 120), wherein the frames are related to a service provided by at least one of the external network (102) and the internal network (112). A method embodiment comprises at least one of the steps of: receiving, from the external network interconnect node (104), frames at the network interconnect interface and forwarding according to a Virtual Local Area Network (VLAN) tagging forwarding process, by the network interconnect node (114), the frames to one or more of the other internal network interconnect nodes (116) or to one or more of the internal network nodes (118, 120) on a network link via the network interface by considering whether the network interconnect node (114) is active for the service associated with the frames; and receiving, from one or more of the other internal network interconnect nodes (116) or from one or more of the internal network nodes (118, 120), frames at the network interface and forwarding according to a VLAN tagging forwarding process, by the network interconnect node (114), the frames to one or more of the other internal network interconnect nodes (116) or to one or more of the internal network nodes (118, 120) on a network link via the network interface or to the external network interconnect node (104) via the network interconnect interface based on at least one of whether the frames are encapsulated frames and whether the network interconnect node (114) is active for the service.