Patent Number: 7,826,345

Title: Network span protection using span identifiers

Abstract: Each span of a communication network, such as a BLSR ring, is assigned a unique span ID. When a node of the network detects a failure in a network span, the node exchanges commands, according to an automatic protection switching (APS) protocol, that request other nodes of the network to switch network traffic from a working span to a protect span. The commands specify the working span by its span ID, without necessarily specifying a source node ID or a destination node ID for the commands. The span ID occupies fewer bits in the commands than bits representing a combination of the source node ID and the destination node ID. Alternatively, the commands specify a destination node ID without a span ID or a source node ID, or the commands specify a source node ID without a span ID or a destination node ID.

Inventors: Kam; Anthony C. K. (Arlington, MA), Xie; Raymond Y. (Westford, MA), Yang; Tao (Acton, MA), Patel; Naimish (Boston, MA)

Assignee: Sycamore Networks, Inc.

International Classification: H04J 1/16 (20060101)

Expiration Date: 2019-11-02 0:00:00