I-D ACTION: draft-jagan-e2e-traf-mgmt-00.txt

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	Title		: End-to-End Traffic Management Issues 
                          in IP/ATM Internetworks
	Author(s)	: Nanying Yin and Shantigram Jagannath
	Filename	: draft-jagan-e2e-traf-mgmt-00.txt
	Pages		: 19
	Date		: 30-Jul-97
	
This document addresses the end-to-end traffic management issues in
   IP/ATM internetworks. In the internetwork environment, the ATM
   control mechanisms (e.g., Available Bit Rate (ABR) and UBR with Early
   Packet Discard (EPD)) are applicable to the ATM subnetwork, while the
   TCP flow control extends from end to end. We investigated the end to
   end performance in terms of TCP throughput and file transfer delay in
   cases using ABR and UBR in the ATM subnetwork. In this document, we
   also discuss the issue of trade-off between the buffer requirements
   at the ATM edge device (e.g., Ethernet-ATM switch, ATM router
   interface) versus ATM switches inside the ATM network.
 
   Our simulation results show that in certain scenarios (e.g., with
   limited edge device buffer memory) UBR with EPD may perform
   comparably to ABR or even outperform ABR. We show that it is not
   sufficient to have a lossless ATM subnetwork from the end-to-end
   performance point of view. The results illustrate the necessity for
   an edge device congestion handling mechanism that can couple the ABR
   and TCP feedback control loops.  We present an algorithm that makes
   use of the ABR feedback information and edge device congestion state
   to make packet dropping decisions at the edge of the ATM network.
   Using the algorithm at the edge device, the end-to-end performance in
   throughput and delay are improved while using ABR as the ATM
   subnetwork technology and with small buffers in the edge device.

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