A congestion control scheme for interconnected local area networks
Hiroshi Inai, Kazuhiro Ohtsuki · 2005
We investigate congestion control issues in an interconnected network where several local area networks (LANs) are connected to a high speed backbone network. In such a network, traffic congestion may occurs due to the difference of transmission speed and/or workload be tween the high speed backbone and the lower speed LANs. To release the congestion and achieve high throughput, we propose a congestion control scheme and evaluate the performance of the scheme via simulation. In our scheme, each bridge always informs the number of available spaces in its buffer to the other bridges. It gives the highest priority in transmission to the packets of which destination bridge has the largest available buffer spaces. Moreover the scheme restricts the maximum number of the packets which have the same destination in order to prevent that the packets destined to the congested bridge stay in the buffer for a long time due to low transmission priority and shut out the other packets destined to the uncongested bridges. Simulation results show that the scheme significantly reduces the packet loss and provides high throughput in the backbone network.