Method and apparatus establishing forwarding state using path state advertisements
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United States of America Patent
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Jun 12, 2012
Grant Date -
Mar 27, 2008
app pub date -
Sep 22, 2006
filing date -
Sep 22, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Paths may be advertised on a network implementing a link state routing protocol by using path state advertisement that are distributed in the same manner as link state advertisements. The path state advertisements contain path entries, each of which includes a globally unique path ID and path information such as a series of nodes or links that defines the path through the network. When a path state advertisement is received by a network element, the network element will evaluate the path entries in the path state advertisement to determine if the path state advertisement is relevant and, if necessary, install forwarding state for the relevant path entries. Path state advertisements not relevant to a network element are not used to affect forwarding state on the network element. Label based forwarding may then be used by the network elements to forward data along the path, in which the globally unique path ID is used as the label for the data.
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