Patent ID: 7864776

Claim:
A method of selecting routing data for a data transfer packet that represents one of at least two quality-of-service classes, is associated with information indicating the quality-of-service class represented by said data transfer packet and is related to protocol data associated with a data transfer protocol being used the method comprising: using said protocol data as an input quantity for reading from memory devices basic data and a reduction rule that are compatible with a routing table and said protocol data, using said information indicating the quality-of-service class as an input quantity of said reduction rule for obtaining auxiliary routing data, and selecting said routing data on the basis of said basic data and said auxiliary routing data, wherein said reduction rule connects auxiliary data to each quality-of-service class in such a way that each auxiliary data is associated with at least two different quality-of-service classes and said auxiliary routing data is that particular auxiliary data that conforms to said reduction rule and to said information indicating the quality-of-service class.