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Internet Congestion Control by Subir Varma

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Chapter 8

Congestion Control in Ethernet Networks

This chapter is on the topic of congestion control in Ethernet networks. Traditionally, Ethernet, which operates at Layer 2, has left the task of congestion control to the TCP layer. However, recent developments such as the spread of Ethernet use in applications such as Storage Area Networks (SANs) has led the networking community to revisit this design because SANs have a very strict requirement that no packets be dropped. As a result, the Institute of Electrical and Electronics Engineers (IEEE) 802.1 Standards group has recently proposed a congestion control algorithm called IEEE802.1Qau or Quantum Congestion Notification (QCN) for use in Ethernet networks. This algorithm uses several advances ...

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