Restricted dissemination of topology information in a communication network
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United States of America Patent
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N/A
Issued Date -
Jan 12, 2006
app pub date -
Oct 13, 2004
filing date -
Jun 9, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A communication network comprises a plurality of nodes interconnected by communication links. A node maintains a database of topology information relating to the network. A node receives a topology advertisement from another node of the network which provides information about a part of the network. The topology advertisement includes a metric which is related to aggregate distance or cost of the path travelled by the topology advertisement. The node compares the metric in the newly received topology advertisement with one previously received for the same part of the network. The database is updated with the newly received topology advertisement if the value of the metric in the newly received topology advertisement is lower than the metric in the topology advertisement previously received for the same part of the network. The method can be used during flooding or database synchronisation. The metric can be carried within a header or body of a topology advertisement, such as a Link State Advertisement (LSA).
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