A transport LAN segment service is provided over a transport network. Responsibilities for configuring, provisioning and forwarding over a transport LAN segment are divided between layer 2 and 3 service provider edge devices, where the layer 3 edge device handles discovery and tunneling responsibilities,...http://www.google.com.au/patents/US7577143?utm_source=gb-gplus-sharePatent US7577143 - Decoupling functionality related to providing a transparent local area network segment service
