VLAN Crossconnect (VLAN-XC) is one of several technologies for connection-orienteddata packet switching in Carrier Ethernet. The others are Provider Backbone Bridging with Traffic Engineering (PBB-TE) and Transport MPLS
(T-MPLS). VLAN-XC technology is about the type of addressing. Instead of the MAC address as switching information, a label is encoded in the Ethernet header to identify the corresponding tunnel. The Ethernet header itself is not changed, but only a reserved bit position for the VLAN ID as provided for in the 802.1Q and 802.1ad standards.