1. A method for providing topology awareness information within an IP network, said IP network comprises a central node ( 502 ) of a topology awareness system ( 500 ) that is adapted to store and process topology information, said central node ( 502 ) is connected to at least one topology awareness unit (P) that is implemented in a router ( 504 ) within said IP network, said unit comprises the functionality of a topology awareness system interface ( 402 ), wherein the method comprises the steps of: transmitting a registration message from one of the topology awareness units (P) to the central node ( 502 ), adding an identity of said unit (P) to a list of known units (P) at the central node ( 502 ), and transmitting a response message from the central node ( 502 ) to the unit (P), wherein said response message has at least the capability to order the unit (P) to: keep the current relation with the central node ( 502 ), if the current relation between the unit (P) and the central node ( 502 ) is accepted; aggregate, if the central node ( 502 ) determines that the unit (P) is to be used as an aggregation point; or redirect to a previous aggregation point, if there exist a suitable aggregation point.