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:
Sep. 25, 2012
Filed:
Sep. 02, 2005
Lionel Florit, Greenbrae, CA (US);
Robert W. Klessig, Los Altos Hills, CA (US);
Pauline Shuen, Palo Alto, CA (US);
Francois E. Tallet, Santa Clara, CA (US);
Lionel Florit, Greenbrae, CA (US);
Robert W. Klessig, Los Altos Hills, CA (US);
Pauline Shuen, Palo Alto, CA (US);
Francois E. Tallet, Santa Clara, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
Various systems and methods for implementing virtual ports within ring networks are disclosed. For example, one method involves allocating a logical port that corresponds to a first port and a second port and instantiating a spanning tree protocol instance. The first port and the second port are both assigned to a first ring network. The spanning tree protocol instance selectively blocks the logical port; however, the spanning tree protocol instance is unable to block the first port independently of blocking the second port. Events (e.g., link failures and recoveries) that occur within the ring network are communicated to spanning tree by transitioning the state of the logical port in response to receiving a ring protocol control packet. The spanning tree protocol instance initiates a bridge protocol data unit (BPDU) exchange from the logical port in response to a transition in the state of the logical port.