Method and apparatus to minimize database exchange in OSPF by using a SHA-1 digest value
US7664789B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2005 |
| Grant date | Feb 16, 2010 |
| Priority date | — |
| Expiry date | Jun 30, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method of determining whether database located on a first router is synchronized with the database located on a second router by performing a hash function on the values contained in a link state database to derive a SHA-1 digest value. In an embodiment, the digest value is based on LSA type. The digest value is exchanged initially during a database description packet swap between the first router and second router. If the digest values are the same, the databases are already synchronized. The routers thus skip the database description packet exchange of LSAs in the database and go directly to FULL state, indicating full synchronization between databases on the first and second router and announcing adjacency to each other. If the digest differs, normal database description packet exchange is performed as specified in OSPF.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.