The IP over ATM Mailing List Archive by date[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] [Q] Suggest new protocol providing QoS...
>End station SW/HW needs to be upgraded, switched LANs will be >needed, and a new backbone needs to emerge? right now, we run audio and video on end systems and LANs without RSVP we do NOT need to upgrade anymore than backbone routers to run this voice with guaratees (think: teklephones don't need to be upgraded to change the backboone of a phone net from analogue to digital - ) we can use aggregate, or site based reservations, or w can limit the _number of vat/vic calls from a site (same as a call blockig model) or we can add an authneticated application that does the rsvp and does billing - there are a plethora of ways of deploying guarantees and rsvp in the internet without changing end system operating systems or comms stack code, or even applications.... >Of course I am referring to the availability of quality voice and >video services that require advanced scheduling and potentially >a lot of hardware support. For these applications, I don't believe >a simple software upgrade to current IP backbone will do any good. well, on the UK SuperJANET net, we have an existence proof that your belief is wrong - we upgraded the backbone, and can run broadcast quality video...over IP... it isn't hard...and in fact, the way it delpys is very nice, since there are strong incentives to come up with more scalable solutios to admission control and billing than a VC per user per sessio typically hints at.... one of the problems with VC nets is they encourage you to use the lowest level of multiplexing, which gives the least level of traffic aggregation...whilsts tennenhouse's paper on "layered multiplexing considered harmful" is very well and good , i would counter it with "lowest layer multiplexing cosindered injurious to large scale network traffic management"... regards > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > Raif O. Onvural, Senior Engineer, Manager > Network Technology Architecture, IBM, BUAA/664, RTP, NC 27709 > 919-254-4687 Fax: 919-254-5410 e-mail: onvural@vnet.ibm.com jon
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