Method of reducing the amount of information included in topology database update messages in a data communications network
US5101348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1988 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Jun 23, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/021
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.