Method and apparatus for computing a backup path using fate-sharing information
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United States of America Patent
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May 7, 2013
Grant Date -
Apr 19, 2012
app pub date -
Dec 27, 2011
filing date -
Mar 1, 2001
priority date (Note) -
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Abstract
To address shortcomings in the prior art, the invention uses fate sharing information to compute backup paths. Fate sharing information relates groups of nodes or links according to common characteristics, attributes, or shared resources (e.g., a shared power supply, close proximity, same physical link). In one embodiment, fate-sharing information includes costs associated with groups of nodes or links. When a primary path contains a link or node that is in a fate-sharing group, the other links or nodes in the fate-sharing group are assigned the cost associated with that fate-sharing group. The node computing the backup path takes into account the assigned cost together with other node and link costs. Discovering the existence of the relationships and assigning costs to the groups may be done manually or automatically.
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