Upgrading the metro ethernet network

Large scale Metro Ethernet Networks are widely deployed using Provider Bridging (PB) technology. Scaling these networks is a challenging task for any network operator. Newer technologies such as Provider Backbone Bridging (PBB) and Multiprotocol Label Switching (MPLS) are available as choices to a carrier that is upgrading PB networks. In this paper we focus on technologies that are be ing deployed in Metro Ethernet Networks and discuss how to introduce them in a gradual way. We also define a method that allows in-service migration of VLAN services. Furthermore, we provide techniques that allow providers to reap the benefits that the new technologies offer from the beginning of their deployment without the need for a forklift network upgrade.