Decoupling functionality related to providing a transparent local area network segment service

摘要

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, the layer 2 edge device handles learning and flooding responsibilities, and information can be exchanged between the layer 2 and 3 edge devices. Configuration is simplified by advertising TLS-label information, layer 2 address learning, and flooding when the needed configuration information has not yet been learned or discovered.

主权项

1. For use in a first device and a second device of a transport network adapted to provide a transparent LAN segment service, a method for processing ingress data received by a port of the first device, the method comprising:
a) at the first device, determining a layer 2 destination address associated with the ingress data; b) at the first device, attempting to determine a first label using the layer 2 destination address; and c) responsive to a successful determination of the first label,
i) at the first device, adding the first label to at least a portion of the ingress data to generate modified data;ii) at the first device, identifying, based on the port on which the ingress data was received, a transparent LAN segment with which the ingress data is associated;iii) at the first device, forwarding the modified data to a second device that the first device associates with the transparent LAN segment;iv) at the second device, using the first label to determine a second label and tunnel information;v) at the second device, adding the second label to at least a portion of the modified data to generate twice modified data; andvi) at the second device, forwarding the twice modified data towards a third device based on the tunnel information.