Load balancing for fast reroute backup tunnels
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United States of America Patent
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Aug 17, 2004
Grant Date -
Mar 18, 2004
app pub date -
Jan 17, 2002
filing date -
Jan 17, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
Load balancing among fast reroute backup tunnels in a label switched network is achieved. M backup tunnels may be used to protect N parallel paths. A single backup tunnel may protect multiple parallel paths, saving on utilization of network resources such as router state and signaling information. A single path may be protected by multiple backup tunnels, assuring that bandwidth guarantees are met under failure conditions even when no one backup tunnel with sufficient bandwidth may be found. A packing algorithm is used to associate individual label switched paths (LSPs) with individual backup tunnels. If an LSP cannot be assigned to a backup tunnel, it may be either rejected, or additional bandwidth is allocated to existing backup tunnels, or a new backup tunnel is established.
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