The present invention relates to bandwidth shaping in a data communications system. The bandwidth shaping is adjusted according to different traffic streams and depends on the destination of each traffic stream The destination dependent bandwidth shaping according to the present invention is achieved by means of, in a router according to the invention, introducing quality of service profiles (21, 22) that are based on the contents of the router's routing table (15). The routing table (15) includes information (16, 17) regarding how to route traffic to known destinations (16), and information (18) on where to forward traffic to an unknown destination. By means of creating an association between the quality of service profiles (21, 22) and the routing table (15), the bandwidth shaping can be made dependent on the contents of the routing table (15). According to an embodiment of the present invention, all traffic streams to destinations (16) that are known and specified in the routing table (15) are allocated bandwidth according to a first set of requirements (21b) in a first quality of service profile (21), while traffic streams to destinations that are not specified in the routing table (15) are allocated bandwidth according to a second set of requirements in a second quality of service profile (22).
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