-
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.
-
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.
-
公开(公告)号：DE3887572T2
公开(公告)日：1994-08-18
申请号：DE3887572
申请日：1988-05-27
Applicant: IBM
Inventor： ARROWOOD ANDREW HILLIARD , BARATZ ALAN EDWARD , CHIMENTO PHILIP FRANCIS , DRAKE JOHN ELLIS , EISENBIES JOHN LAWRENCE , GRAY JAMES PEYTON , NORSWORTHY KARLA JEAN , POSEFSKY DIANE PHYLIS
Abstract: Each network node in a communications network maintains its own copy of the network topology database defining network resources. Each resource record contains a "timer" field which is initially set to a maximum value but which may be decremented on a daily basis. If the timer field is decremented to zero without being reset, the node unilaterally removes the resource record from its copy of the database. The timer field will normally reach zero only for obsolete resource records since each network node responsible for a resource broadcasts a timer-resetting message for the resource (1) each time the resource status changes, (2) when the node first joins or rejoins the network, and (3) on a periodic (weekly) basis regardless of whether conditions (1) or (2) have occurred.
-
公开(公告)号：DE3887572D1
公开(公告)日：1994-03-17
申请号：DE3887572
申请日：1988-05-27
Applicant: IBM
Inventor： ARROWOOD ANDREW HILLIARD , BARATZ ALAN EDWARD , CHIMENTO PHILIP FRANCIS , DRAKE JOHN ELLIS , EISENBIES JOHN LAWRENCE , GRAY JAMES PEYTON , NORSWORTHY KARLA JEAN , POSEFSKY DIANE PHYLIS
Abstract: Each network node in a communications network maintains its own copy of the network topology database defining network resources. Each resource record contains a "timer" field which is initially set to a maximum value but which may be decremented on a daily basis. If the timer field is decremented to zero without being reset, the node unilaterally removes the resource record from its copy of the database. The timer field will normally reach zero only for obsolete resource records since each network node responsible for a resource broadcasts a timer-resetting message for the resource (1) each time the resource status changes, (2) when the node first joins or rejoins the network, and (3) on a periodic (weekly) basis regardless of whether conditions (1) or (2) have occurred.
-
-
-
Search Results
4
records
(took 0.016 seconds)
