Experimental Evaluation of Scalability and Reliability of a Feedback-based Upc-parameters Renegotiation Mechanism

As a result of rapidly changing traffic characteristics in QoS-enabled networks oftentimes renegotiating the bandwidth requirements are needed. Once renegotiation is started, the sender keeps this process of invoking renegotiation until new requirements can be fulfilled (or until connection is eventually terminated.) The frequency of polling the network is delicate balance between huge traffic overhead traffic with decreased throughput and under-utilization of the network. While driving optimal follow-up rate is a hard problem, several efficient solutions have been proposed. We have earlier proposed a Scalable Feedback Based UPC-Parameters Renegotiation Protocol for ATM networks which gives efficient solution to this problem. The proposed solution minimizes the overhead by shifting the repeated polling away from the senders/users. Experimental evaluation of scalability and reliability aspects of our solution is presented in this paper.