Method and node for controlling the forwarding quality in a data network

1 . Method for controlling the forwarding quality in a data network comprising a measurement manager comprising means for performing measurements in said data network and a Network Resource Manager, NRM, comprising means for obtaining information of the network topology, the method is characterised in that it comprises the steps of:

detecting potentially overloaded paths or individual out-interfaces by using a detecting-method,

selecting one or more nodes where measurements are to be performed based on the detected potentially overloaded paths or individual out-interfaces, and

measuring quality metrics in the selected nodes.

2 . Method according to claim 1 , wherein the detecting method comprises the steps of:

transferring obtained information of the network routing topology from the NRM to the measurement manager or transferring a result of a performed end-to-end measurement by a measurement manager to the NRM,

combining said end-to-end measurements and said obtained information of the network routing topology into a first information set, and

combining said first information set with information on data flow presence at individual out-interfaces.

3 . Method according to claim 1 , wherein the detecting method comprises the steps of:

using knowledge of booking levels per out-interface in combination with knowledge of the allocated capacity for the respective interface.

4 . Method according to claim 1 , wherein the detecting method comprises the steps of:

measuring on the incoming traffic to a network,

determining over which interface different aggregate of traffic will be transported by using knowledge of the topology, and

looking at the destination prefix of the IP packets

estimating based on the previous steps the load over each interface in order to identify potentially overloaded interface.

5 . Method according to claim 1 , wherein the measurement of the quality metrics is initiated by the NRM.

6 . Method according to claim 1 , wherein the measurement of the quality metrics is initiated by the measurement manager.

7 . Method according to claim 5 comprising the further step of:

scheduling transfer of the measured quality metrics between the NRM and the measurement manager over time.

8 . Method according to claim 5 , comprising the further step of

initiating transfer of the measured quality metrics between the NRM and the measurement manager periodically.

9 . Method according to claim 5 , comprising the further step of:

requesting transfer of the measured quality metrics between the NRM and the measurement manager explicitly.

10 . Method according to claim 5 , comprising the further step of:

triggering transfer of the measured quality metrics between the NRM and the measurement manager by specific events.

11 . Method according to claim 1 , wherein the measured quality metrics are a loss rate or a queuing delay.

12 . Node in a data network comprising a computer program product directly loadable into the internal memory of a computer within one or more nodes in a data network, comprising the software code portions for performing the steps of claim 1 .

13 . Node in a data network comprising a computer program product stored on a computer usable medium, comprising readable program for causing a computer, within one or more nodes in a data network to control an execution of the steps of claim 1.