Method of reserving network bandwidth resources, and communications system and network device using the same
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United States of America Patent
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Mar 31, 2009
Grant Date -
Apr 5, 2007
app pub date -
Mar 31, 2006
filing date -
Sep 30, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A communications system whose bandwidth resources can be used more efficiently by reserving them on an individual path basis. Upon receipt of a bandwidth reservation message, a path setup initiator examines the message and thereby recognizes that the local station device is the egress node of a specified logical network segment. It then consults a topology database to retrieve hop counts of the source station device, which reveals, for example, that a first ringlet has a smaller hop count than a second ringlet. The path setup initiator sends a working path setup message to the ingress network device over the first ringlet, as well as a protection path setup message to the same ingress device over the second ringlet. Upon receipt of those messages, a bandwidth reservation unit reserves a working path bandwidth on the second ringlet, as well as a protection path bandwidth on the first ringlet.
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