The protocol of RPR lacks the definition on the interconnection among multi RPR rings. Compatible with RPR protocol, a scheme which could implement interconnection among multi RPR rings is proposed. The simulation results are given to prove the scheme.
Dual-ring networks are known to provide higher throughputs and reliability than other competing ring technologies. Resilient Packet Ring (RPR) is a Media Access Control (MAC) layer protocol that operates over a double counter-rotating ring network topology. RPR is designed to enhance Synchronous Digital Hierarchy(SDH) in order to handle data traffic more efficiently. Since Intelligent Protection Switching(IPS) is one of the key technologies in ring networks, RPR provides two intelligent protection algorithms: steering and wrapping. While wrapping in RPR in essence inherits the automatic protection switching(APS) algorithm of SDH, it also wastes the bandwidth on the wrapping ringlets and may result in severe congestion. Whereas steering in RPR provides high bandwidth utilization, its switching speed is low because that it is indeed a high layer’s restoration algorithm. In this paper, an effective algorithm integrated self-healing(ISH) algorithm for RPR is proposed, which synthesizes the merits of the two algorithms by transporting healing signal and computing routing in MAC layer. At last, the performance of ISH algorithm is analyzed and simulated.
The new requirements of Metropolitan Area Networks (MANs) have resulted in the emergence of new data transport technology, Resilient Packet Ring (RPR). The issue of fairness is one of the key technologies in RPR. Whereas traditional definitions for fairness are not applicable for RPR, a fairness conception for RPR based upon ingress aggregated flow is presented in this paper. Then fairness algorithms described in the draft of IEEE standard for RPR is analyzed. In order to overcome the defect under condition of unbalanced data stream, an improvement of the fairness algorithm named RPR-RE which adopts the rate estimation is produced to achieve better performance. At last, the simulation is made and the results are given to prove the conclusion that RPR-RE could eliminate the throughput oscillation approximately compared with the algorithm defined in IEEE standard draft under the scenarios with unbalanced flow. Furthermore, RPR-RE algorithm could implement the fairness between the nodes when multiple congested nodes exist in the ring.