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. 04, 2011
Filed:
Dec. 16, 2003
David Elie-dit-cosaque, Richardson, TX (US);
Girish Chiruvolu, Plano, TX (US);
Jessy Rouyer, Addison, TX (US);
Ljubisa Tancevski, Dallas, TX (US);
Jean-francois Cartier, Treillieres, FR;
Laurence Rose, Oak Park, CA (US);
L. Michele Goodwin, Westlake Village, CA (US);
David Elie-Dit-Cosaque, Richardson, TX (US);
Girish Chiruvolu, Plano, TX (US);
Jessy Rouyer, Addison, TX (US);
Ljubisa Tancevski, Dallas, TX (US);
Jean-Francois Cartier, Treillieres, FR;
Laurence Rose, Oak Park, CA (US);
L. Michele Goodwin, Westlake Village, CA (US);
Alcatel Lucent, Paris, FR;
Abstract
Customer virtual local area networks (C-VLANs) connecting multiple LAN segments are set up through a provider network (). Provider edge bridges (PEs) are coupled to customer edge bridges (CEs) to provide a transparent link between LAN segments. To determine whether a backdoor link is used in the C-VLAN topology, PEs monitor MAC address from a predetermined time after a TCN is received to determine if there are contradictory addresses or new addresses relative to the existing MAC address tables (or forwarding databases) that are indicative of a backdoor link. If so, an unlearning message is sent to bridges in the provider domain. In another embodiment, CEs set a snoop bit to indicate which TCNs must be snooped.