> Advanti sAbstrac t This report concentrates on specific requirements an d goals of the research networks supported by ANSNET , but applies to any TCP dominated high speed WA N and in particular those striving to support high spee d end-to-end flows . Measurements have been made unde r conditions intended to better understand performanc e barriers imposed by network equipment queueing capacities and queue drop strategies .The IBM RS/6000 based routers currently supportin g ANSNET performed very well in these tests . Measurements have been made with the current software an d performance enhanced software . Single TCP flows are able to achieve 40 Mb/s and competing multiple TC P flows achieve over 41 Mb/s link utilization on 44 .7 Mb/ s DS3 links with delays comparable to US cross continen t ANSNET delays . Congestion collapse is demonstrate d with intentionally reduced queueing capacity and usin g window sizes much larger than optimal .A variation of Floyd and Jacobson's Random Earl y Detection (RED) algorithm [1] is tested . Performanc e improved with the use of RED for tests involving multiple flows . With RED and queueing capacity at o r above the delay bandwidth product, congestion collaps e is avoided, allowing the maximum window size to safel y be set arbitrarily high .Queueing capacity greater than or equal to the dela y bandwidth product and RED are recommended . RED provides performance improvement in all but the singl e flow case, but cannot substitute for adequate queuein g capacity, particularly if high speed flows are to be supported .
A usage of the BGP routing protocol is described which is capable of reducing the routing traffic passed on to routing peers and therefore the load on these peers without adversely affecting route convergence time for relatively stable routes. This technique has been implemented in commercial products supporting BGP. The technique is also applicable to IDRP.
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The discussions of the IP over ATM working group over the last several years have produced a diverse set of proposals, some of which are no longer under active consideration. A categorization is provided for the purpose of focusing discussion on the various proposals for IP over ATM deemed of primary interest by the IP over ATM working group. The intent of this framework is to help clarify the differences between proposals and identify common features in order to promote convergence to a smaller and more mutually compatible set of standards. In summary, it is hoped that this document, in classifying ATM approaches and issues will help to focus the IP over ATM working group's direction.
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