SYSTEMS AND METHODS FOR A SELF-HEALING CARRIER ETHERNET TOPOLOGY
First Claim
1. A method for self-healing Carrier Ethernet, comprising:
- statically provisioning a first and second path between a plurality of nodes interconnected in one of a ring and a linear chain topology, wherein one of the plurality of nodes comprises a head-end node configured to provide switching on the first and second paths for local and external network traffic;
provisioning a management channel;
transmitting data from a source node on the first path;
periodically generating distinct Continuity Check Messages (CCMs) on the management channel for each of the first and second paths;
monitoring the distinct CCMs to determine a failure condition within a path;
responsive to the failure condition, transmitting a CCM with a Remote Defect Indicator to the source node; and
switching data from the first path to the second path at the source node responsive to the CCM with the Remote Defect Indicator.
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Accused Products
Abstract
Systems and methods for self-healing Ethernet topologies which are compatible with PBT, which use standards-based protocols, which do not self-configure, and which use Ethernet OAM are provided. Interconnected nodes are configured with a primary and secondary path which is determined by VLANs, MPLS label, Provider Backbone Bridge Traffic Engineering (PBB-TE) VLAN ID (VID), Frame Relay (FR), Asynchronous Transfer Mode (ATM) Virtual Circuits (VCs), and the like. One or more head-end nodes are designated for terminating each path and for performing cross-connects between the primary and secondary paths. IEEE 802.1ag Continuity Check Messages (CCM) are transmitted by all nodes on both the primary and secondary routes. Responsive to a loss of a predetermined number of CCM messages, traffic is switched to the secondary route. In non-fault conditions, both the paths for the primary and secondary routes can carry traffic.
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Citations
20 Claims
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1. A method for self-healing Carrier Ethernet, comprising:
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statically provisioning a first and second path between a plurality of nodes interconnected in one of a ring and a linear chain topology, wherein one of the plurality of nodes comprises a head-end node configured to provide switching on the first and second paths for local and external network traffic; provisioning a management channel; transmitting data from a source node on the first path; periodically generating distinct Continuity Check Messages (CCMs) on the management channel for each of the first and second paths; monitoring the distinct CCMs to determine a failure condition within a path; responsive to the failure condition, transmitting a CCM with a Remote Defect Indicator to the source node; and switching data from the first path to the second path at the source node responsive to the CCM with the Remote Defect Indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A self-healing Carrier Ethernet ring, comprising:
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a plurality of nodes interconnected in a ring topology; a head-end node comprising one of the plurality of nodes; a primary path between each of the plurality of nodes and the head-end; a protect path between each of the plurality of nodes and the head-end; means for detecting a failure in the primary and protect path; and means for switching from the primary path to the protect path responsive to detecting the failure. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A logical tree topology providing a self-healing Ethernet topology, comprising:
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a plurality of head-end nodes; a plurality of nodes, wherein each node is connected to each of the plurality of head-nodes through a dedicated primary and protect path; a management channel connected to each of the plurality of head-nodes and nodes, wherein multicast Continuity Check Messages (CCMs) are generated and monitored by the plurality of head-end nodes and the plurality of nodes on the management path; and means for switching from the primary path to the protect path responsive to CCM message with an RDI flag; wherein the logical tree topology is operable to constrain the path of the multicast CCMs. - View Dependent Claims (17, 18, 19, 20)
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Specification