Method of reducing the amount of information included in topology database update messages in a data communications network
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United States of America Patent
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Mar 31, 1992
Grant Date -
N/A
app pub date -
Jun 23, 1988
filing date -
Jun 23, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a communications network, each network node can maintain its own list of network resources in a topology database. When the state of a resource 'owned' by a particular node changes, that node broadcasts a topology database update (TDU) message to adjacent nodes. Each adjacent node updates its own topology database and rebroadcasts the message. To minimize the amount of information that must be included in TDU messages when two nodes are reconnected after an outage, each node assigns flow reduction sequence numbers (FRSNs) to TDU meassages and keeps a record of the FRSN for the last TDU message sent to an adjacent node. The node also records, for each resource in its database, the FRSN of the last TDU message including that resource. When two nodes are reconnected, the sending node includes in the TDU message only those resources having a FRSN greater than the FRSN assigned to the last TDU sent to the adjacent node to which the TDU message is directed.
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