Toshiyuki Sudo

Analysis of ABR behavior over ATM-based broadband access networks

There has been an enormous growth in the popularity of the Internet. The provisions of access to the Internet will be one of the principal services of the next generation of access networks. In order to provide cost effective Internet access over ATM-based broadband access networks, the introduction of an available bit rate (ABR) service class is a promising solution. This paper describes our analysis of the ABR behavior over ATM based access networks focusing on explicit-rate-based rate controls and their round-trip time effects. We also describe the hardware implementation of the ABR-based rate controls.

Implementation and Analysis of Scalable and Flexible Node for Large-scale Networks

It is necessary to improve the performance of packet forwarding nodes that form part of large-scale and functionally advanced networks to ensure that they function easily and effectively. In this paper, we propose a separation method, in which functions in the network node are divided into forwarding functions and control functions, and each set of functions is executed on different hardware (forwarder and controller). With this method, we configure resources in the forwarder as the controllers own virtual resources. By doing so, the software, which runs on the controller, is able to treat the forwarders resources as its own. We evaluate the effect of this method by applying it to a router, and clarify the performance improvement by the proposed method. And we select a stateful packet filtering as another test target, which executes the complex processing in packet forwarding. We then examine the field where the pro-posed method is effective