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公开(公告)号：DE68918765D1
公开(公告)日：1994-11-17
申请号：DE68918765
申请日：1989-06-07
Applicant: IBM
Inventor： ARROWOOD ANDREW HILLIARD , CLARKE KATHRYN E , DRAKE JOHN ELLIS , EISENBIES JOHN LAWRENCE , GRAY JAMES PEYTON , NORSWORTHY KARLA JEAN , POZEFSKY DIANE PHYLIS , SMETANKA TERENCE DALE
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 messages 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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公开(公告)号：DE68918765T2
公开(公告)日：1995-04-27
申请号：DE68918765
申请日：1989-06-07
Applicant: IBM
Inventor： ARROWOOD ANDREW HILLIARD , CLARKE KATHRYN E , DRAKE JOHN ELLIS , EISENBIES JOHN LAWRENCE , GRAY JAMES PEYTON , NORSWORTHY KARLA JEAN , POZEFSKY DIANE PHYLIS , SMETANKA TERENCE DALE
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 messages 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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