Protection switching at a network node
US7280472B2 · kind B2 · utility
8Cited by
4References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2003 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Dec 4, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/22
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Protection switching between primary and secondary paths in a packet-based network involves table entries that are pre-programmed with a primary path, a secondary path, and a value that identifies the primary path, referred to as a primary path identifier (PPI). When table entries are accessed to make forwarding decisions, the PPI is compared to a field that identifies that a particular path is down, referred to as a down path identifier (DPI). If the two fields match, (i.e., PPI=DPI), then the secondary path is selected instead of the primary path as the path on which the traffic should be forwarded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.