The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2006
Filed:
Mar. 29, 2001
P K Chidambaran, Santa Clara, CA (US);
Thomas a Hoch, Boxborough, MA (US);
John Patrick Jones, Westford, MA (US);
Andrew a Long, Northborough, MA (US);
Prasasth R Palnati, Westford, MA (US);
Raymond J Schmidt, Stoughton, MA (US);
P K Chidambaran, Santa Clara, CA (US);
Thomas A Hoch, Boxborough, MA (US);
John Patrick Jones, Westford, MA (US);
Andrew A Long, Northborough, MA (US);
Prasasth R Palnati, Westford, MA (US);
Raymond J Schmidt, Stoughton, MA (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
The present invention is a methodology for controlled switchover of unicast and multicast data flows in packet based switching system. In some cases it is advantageous to purposefully support switchover of flows from one path to the other without causing loss of data. This is termed a 'controlled' or 'hitless' switchover. In accordance with the present invention switchover methodology, given that an ingress arbiter device is transmitting to both cores simultaneously, it is required that the flows to both switching cores be synchronized at an aggregator level and that an egress arbiter be given time to cease receiving packets from one Core then switch over to the other Core, and continue receiving packets.