Joshua A Singer, 441920 6Th St APT 437, Santa Monica, CA 90405

2007017, Aug 2, 2007

Feb 1, 2006

11/345093

Joshua Singer - Cambridge MA, US
Hani El-Sakkout - Sudbury MA, US
Vassilios Liatsos - Arlington MA, US
Frederick Serr - Concord MA, US

CISCO TECHNOLOGY, INC. - San Jose CA

H04J 1/16

370235000, 370252000

A method and system for calculating data traffic flow in a communications network are disclosed. The communications network comprises a plurality of nodes including a plurality of source nodes, a plurality of destination nodes, and a plurality of intermediate nodes. Each of the intermediate nodes includes at least one elbow comprising one ingress interface and one egress interface of the intermediate node. The method includes obtaining local data traffic measurements at each of the elbows, wherein the local data traffic measurements comprise data traffic arriving at the intermediate node via the ingress interface and leaving the intermediate node via the egress interface. The local data traffic measurements are used in calculation of the traffic flow and may be used, for example, to generate data traffic matrix information using data traffic matrix inference or data traffic matrix estimation.