Congestion control mechanisms of IEEE 802 . 1 Qau for reducing the load of Metro Ethernet networks

In the past few years, the data-processing network has become an essential resource in all fields. Metro Ethernet is a new type of data-processing network, which is commonly deployed for metropolitan areas. Yet, despite the importance of this network, it continues to be afflicted by the issue of congestion, caused by insufficiency of resources or by the bandwidth difference between one network and another. Therefore, to ensure an effective use of this resource, Metro Ethernet networks must be properly controlled to avoid the loss of data and to maintain good performance. Recently, several congestion control mechanisms, which follow the standard IEEE 802.1Qau [WGP 08], have been proposed, including the Ethernet Congestion Manager (ECM), Quantized Congestion Notification (QCN), Quantized Ethernet Congestion Manager (QECM), and QCN Serial HAI. A comparative study and evaluation of performance among these mechanisms was made, and it was noted that QCN Serial HAI was the most efficient mechanism [ABD 07b]. However, this mechanism uses an enormous number of notification messages, which overloads the network. Our objective in this paper is to suggest ways of reducing the load of networks.

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