Reoptimization triggering by path computation elements
US7031262B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2004 |
| Grant date | Apr 18, 2006 |
| Priority date | — |
| Expiry date | May 19, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L47/825
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mechanism to alleviate bandwidth fragmentation in a network employing path computation element(s) to place MPLS Traffic Engineering tunnels. One application is a multiple Autonomous System or multiple area network employing distributed computation of MPLS Traffic Engineering LSPs. A particular path computation element may determine that bandwidth fragmentation is present based on monitoring of path computation failures where desired paths are blocked due to bandwidth constraints. In response to the detected bandwidth fragmentation condition, the path computation element floods a routing notification within its Autonomous System or area. Nodes respond to the routing notification by requesting reoptimization of their own previously requested Traffic Engineering LSPs allowing the path computation element an opportunity to alleviate bandwidth fragmentation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.