In this paper, a novel congestion control for multimedia traffics in Metro Ethernet Networks known as Jitter-Based
Congestion Control (JBCC) is proposed. The basic ideal of JBCC is that the jitter-corrupted multimedia packets are
useless to the client and it is a waste of network resources to continue to forward these packets in the networks. JBCC
improves the QoS of multimedia stream in Metro Ethernet Network by detecting and discarding packets that
accumulated enough jitter so as to maintain a high bandwidth for packets that stay within the multimedia stream's jitter
tolerance. Simulation results have shown that the proposed scheme can effectively lower the average received packet
jitter than that using traditional congestion control algorithm RED and DropTail. Moreover, the proposed scheme can
improve the useful goodput of the received packets when compared to RED and DropTail.
IP multicast suffers from scalability problems when the number of simultaneously active multicast groups is very large. In this paper, we propose an algorithm called SGTM (Scalable Group-Tree Match algorithm) which reduces the number of trees by allowing several groups to be aggregated to the same delivery tree with controllable cost and introduce metrics to measure multicast state and tree management overhead for multicast schemes. SGTM performs faster aggregations than previous aggregation algorithms by evaluating fewer trees for each group, while keeping the same performance. We then show the scalability and the fastness of SGTM by several simulations and we compare its performance to the previous algorithm.