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. 18, 2012
Filed:
Oct. 07, 2009
Liam M. Casey, Ottawa, CA;
David Ian Allan, Ottawa, CA;
Nigel Lawrence Bragg, Cambridgeshire, GB;
Jerome Chiabaut, Ottawa, CA;
Liam M. Casey, Ottawa, CA;
David Ian Allan, Ottawa, CA;
Nigel Lawrence Bragg, Cambridgeshire, GB;
Jerome Chiabaut, Ottawa, CA;
Rockstart Bidco, LP, New York, NY (US);
Abstract
A method ensures that multicast packets follow the same loop-free path followed by unicast packets in a packet communication network. The communication network includes at least one first area interconnected through at least one area border node ('ABN') to a second area. Each ABN has a first level port connected to each first area and a second level port connected to the second area. Each multicast packet forwarded includes a header having a root-id identifying a root of a multicast tree. A data packet is received at an ABN. Responsive to receiving a multicast packet at a second level port of an area border node, the root-id of the multicast packet is examined and if the multicast packet is to be forwarded over at least one of the first level ports, a different root-id is substituted into the packet before the packet is forwarded over the first level port.