Redundant ethernet automatic protection switching access to virtual private LAN services

摘要

Embodiments disclosed herein provide redundant connectivity between an Ethernet Automatic Protection Switching (EAPS) access network and a Virtual Private LAN Service (VPLS) network. A first VPLS node is provided to function as an EAPS controller node. A second VPLS node is provided to function as an EAPS partner node. The first and second VPLS nodes are linked by a pseudowire and an EAPS shared-link. Additional EAPS nodes are also provided. The additional EAPS nodes are linked to each other and one of the additional EAPS nodes is designated as a master node. Links are also established between the VPLS nodes and the EAPS nodes such that one or more EAPS rings are formed. Each EAPS ring includes the shared-link between the first and second VPLS nodes. The EAPS rings are monitored to detect link failures. When a failure of the pseudowire shared-link between the first and second VPLS nodes is detected, all pseudowire links associated with the first VPLS node are disabled if any of the EAPS nodes has a path to both of the VPLS nodes. Otherwise, the existing pseudowire links associated with the first VPLS node are maintained.

主权项

1. A method for providing redundant connectivity between an Ethernet Automatic Protection Switching (EAPS) access network and a Virtual Private LAN Service (VPLS) network, the method comprising:
providing first and second VPLS nodes from a plurality of VPLS nodes, which are linked with each other by pseudowire links, wherein the first and second VPLS nodes are linked with each other by an EAPS shared-link; establishing an EAPS ring coupling the first VPLS node with the second VPLS node and a plurality of EAPS nodes; detecting a network failure of the EAPS shared-link between the first and second VPLS nodes; disabling, in response to detecting the network failure, all pseudowire links associated with the first VPLS node when any of the plurality of EAPS nodes has a path to both the first and second VPLS nodes; maintaining, in response to detecting the network failure, existing pseudowire links associated with the first VPLS node when any of the plurality of EAPS nodes lacks a path to both the first and second VPLS nodes; blocking a secondary port of a master node during normal operation; and unblocking the secondary port of a master node in response to detecting the network failure.