Network span protection using span identifiers
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United States of America Patent
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Nov 2, 2010
Issued Date -
N/A
app pub date -
Jul 7, 2004
filing date -
Jul 8, 2003
priority date (Note) -
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status (Latency Note)
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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.
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