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:
Jan. 27, 2009
Filed:
May. 23, 2005
James Guichard, Groton, MA (US);
Daniel C. Tappan, Boxborough, MA (US);
Jean-philippe Vasseur, Dunstable, MA (US);
Simon Spraggs, Hayling Island Hants, GB;
James Guichard, Groton, MA (US);
Daniel C. Tappan, Boxborough, MA (US);
Jean-Philippe Vasseur, Dunstable, MA (US);
Simon Spraggs, Hayling Island Hants, GB;
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A system and method are provided for separately distributing edge-device labels and routing information across routing areas of a computer network. Because the edge-device labels are distributed separately from network routing information, the process of distributing the edge-device labels does not preclude conventional edge-device address summarizations. Illustratively, a novel 'label mapping' LSA is employed for distributing the edge-device labels across routing areas. The label-mapping LSA may be embodied as an area-scope OSPF opaque LSA (type 10) or an IS-IS LSP containing TLVs of area scope. Advantageously, the present invention is generally applicable whenever label values are allocated to edge devices in a multi-area computer network and data is 'tunneled' through the network from one edge device to another.