 Accordingly, there is a long felt need for leveraging the forwarding efficiency of VLAN networking, while at the same time solving its addressing space scalability issues described previously.Increasing the VLAN tag size would mean bigger forwarding table, longer forwarding table entries, and a modification of current mass-market Ethernet chips, requirements that are not vital to the enterprise world.HVLAN introduces hierarchy into the VLAN tag, in a way somewhat similar to classless subnets in the Internet Protocol with Classless Inter-Domain Routing (CIDR).