Techniques to manage a flow cache
US7555608B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2006 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Sep 10, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L47/2441
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Techniques are described herein that may be used to invalidate all entries in a table. For example, the table may be a flow cache. For example, an expiry time may be associated with one or more entries in the table. The expiry time of an entry may be initially set to the sum of the system time, the expiry time of the protocol associated with the entry, and a global time variable. To check if the entry is expired at any time, the current system time may be added to the global time variable and if the result is greater than the expiry time in the entry, then the entry is expired. To invalidate all the entries, the global time variable may be incremented by a large amount which may equal the maximum expiry time of all protocols. This may cause all entries to expire. New entries may be added using the new incremented value of the global time variable and will hence not expire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.