A method for interworking between a first protocol entity (12, 202, 702, 802, 902) adapted to operate in accordance with a stream reservation protocol for reserving resources for a data stream along a stream path of the data stream and a second protocol entity (14a, 14b, 203, 703, 803, 903) adapted to operate in accordance with a routing protocol for distributing information in a communication network (20, 401, 501, 601), the method comprising: - sending (S22, 1102, 1203), from the first protocol entity (12, 202, 702, 802, 902) to the second protocol entity (14a, 14b, 203, 703, 803, 903), a request for stream path information indicating, for a data stream to be sent from a source device (109, 408, 508, 608) to a destination device (18, 409, 509, 609), a stream path in the communication network (20, 401, 501, 601), - determining, by the second protocol entity (14a, 14b, 203, 703, 803, 903), the stream path information based on the request, - initiating (S34, 1105, 1108, 1207), by the second protocol entity (14a, 14b, 203, 703, 803, 903), an establishment of the stream path in the communication network (20, 401, 501, 601) by sending the stream path information in a protocol data unit according to the routing protocol over the communication network (20, 401, 501, 601) or by sending the stream path information in a protocol data unit according to the routing protocol to a network node of the communication network (20, 401, 501, 601), - sending (S26, 1107, 1206), from the second protocol entity (14a, 14b, 203, 703, 803, 903) to the first protocol entity (12, 202, 702, 802, 902), the stream path information, and - initiating, by the first protocol entity (12, 202, 702, 802, 902), a resource reservation procedure for reserving resources in response to receiving the stream path information, wherein the step (S28, 1108, 1208) of initiating the resource reservation procedure comprises: - sending, by the first protocol entity (12, 202, 702, 802, 902), an instruction for reserving resources in the communication network (20, 401, 501, 601) in a data packet unit according to the stream reservation protocol based on the stream path information. - sending (S22, 1102, 1203), from the first protocol entity (12, 202, 702, 802, 902) to the second protocol entity (14a, 14b, 203, 703, 803, 903), a request for stream path information indicating, for a data stream to be sent from a source device (109, 408, 508, 608) to a destination device (18, 409, 509, 609), a stream path in the communication network (20, 401, 501, 601), - determining, by the second protocol entity (14a, 14b, 203, 703, 803, 903), the stream path information based on the request, - initiating (S34, 1105, 1108, 1207), by the second protocol entity (14a, 14b, 203, 703, 803, 903), an establishment of the stream path in the communication network (20, 401, 501, 601) by sending the stream path information in a protocol data unit according to the routing protocol over the communication network (20, 401, 501, 601) or by sending the stream path information in a protocol data unit according to the routing protocol to a network node of the communication network (20, 401, 501, 601), - sending (S26, 1107, 1206), from the second protocol entity (14a, 14b, 203, 703, 803, 903) to the first protocol entity (12, 202, 702, 802, 902), the stream path information, and - initiating, by the first protocol entity (12, 202, 702, 802, 902), a resource reservation procedure for reserving resources in response to receiving the stream path information, wherein the step (S28, 1108, 1208) of initiating the resource reservation procedure comprises: - sending, by the first protocol entity (12, 202, 702, 802, 902), an instruction for reserving resources in the communication network (20, 401, 501, 601) in a data packet unit according to the stream reservation protocol based on the stream path information.