Congestion and Congestion control in packet switch networks has been an active area of research for a long time. Congestion is defined as loss of network performance when a network is highly loaded. The problem of congestion control in ATM (Asynchronous Transmission Mode) has assumed a different dimension, because of the gigbit speed provided by ATM networks. Congestion control algorithms of pa...

The InfiniBand Architecture (IBA) is a relatively new industry-standard networking technology suited for inter-processor and I/O communication. One of the challenges facing IBA networks is how to deal with congestion. The most recent version of the IBA specification includes a Congestion Control Annex (CCA) that relies on end-to-end Explicit Congestion Notification (ECN) packet marking to resol...

TCP was designed for wireline networks, where loss events are mostly caused by network congestion. The congestion control mechanism of current TCP uses loss events as the indicator of congestion, and reduces its congestion window size. However, when a lossy link is involved in a TCP connection, non-congestion random losses should also be considered. The congestion window size should not be decr...

This document contributes to the effort to add explicit congestion notification (ECN) to IP. In the current effort to standardise ECN for TCP it is unavoidably necessary to standardise certain new aspects of IP. However, the IP aspects will not and cannot only be specific to TCP. We specify interaction with features of IP such as fragmentation, differentiated services, multicast forwarding, and...

Re-inserted ECN (re-ECN) is a proposed TCP/IP extension that informs the routers on a path about the estimated level of congestion. The re-ECN protocol extends the Explicit Congestion Notification (ECN) mechanism and reinserts the obtained feedback into the network. This exposure of congestion information is a new economic traffic management mechanism that enables the network to share the avail...

This document defines an Experimental Protocol for the Internet community. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Intern...

Adaptive Model Predictive Transmission Control Protocol (AMP-TCP) as a new TCP delay-based congestion control algorithm is introduced. Both aspects of design and implementation of the algorithm are described using simulations on the ns-2 network simulator. The design stage is composed of two steps. First, a recursive system identification approach is proposed to capture the network delay dynami...

Reactive congestion control based upon two thresholds is analyzed. Under the congestion control treated here, a multiplexer or transit node in the network recognizes congestion when its queue length reaches some pre-determined threshold value, denoted by H. The congested node then explicitly informs the sources sharing the node of its congestion in some way to mark a forward congestion notifica...

This note describes a proposed addition of ECN (Explicit Congestion Notification) to IP. TCP is currently the dominant transport protocol used in the Internet. We begin by describing TCP’s use of packet drops as an indication of congestion. Next we argue that with the addition of active queue management (e.g., RED) to the Internet infrastructure, where routers detect congestion before the queue...