Patent ID: 7561519
Filing Date: 2009-07-14
Classification: H04L,H04Q

Abstract:
1. A method for providing Class-of-Service (COS) routing of a call or connection request between an origin node and a destination node in a multi-link network employing a Private Network-to-Network Interface (PNNI) protocol, comprising the steps of: (a) searching for a shortest path between the origin and destination nodes, then; (b) determining the class of service of the call; (c) determining for each link in the path, on a link-by-link basis, whether each link has available bandwidth for the Class of Service for the call by performing the steps of: if said each link in the shortest path has sufficient bandwidth, then routing the call to the destination node across the shortest path, otherwise, (d) if insufficient bandwidth is available on any of the links, then sending a crankback message to the origin node; thereafter searching for a next shortest path and then repeating step (c).