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:
Oct. 05, 2004
Filed:
Mar. 31, 1999
Ashish K. Dey, Fremont, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
The invention relates to a method and apparatus for rapidly re-starting a spanning tree process at an intermediate device. A spanning tree entity running one or more instances of a spanning tree process or protocol stores a record of spanning tree parameter information and port states in a non-volatile memory. Following a re-start, the spanning tree entity verifies whether the parameter information in the non-volatile memory is still valid. If so, the spanning tree entity adopts the port states and the intermediate device resumes forwarding messages accordingly. If the spanning tree parameter information from the non-volatile memory is no longer valid, the spanning tree entity discards it and proceeds to re-calculate the spanning tree and transition its port states in a conventional manner.