An arrangement associated with a Bandwidth Manager, BM, adapted to reserve and return network resources requested from a first entity in a data network. The arrangement includes a first message rate limiter element (301) adapted to limit the rate of reservations request messages to the BM, a second message rate limiter element (302) adapted to limit the rate of resource return messages to the BM, and at least one message rate estimator unit (303) adapted to adjust the message rate limiters between the reservation request signalling peak rate and sustained rates defined for the communication between the BM and a second entity.