North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: QoS/CoS in the real world?
On Sun, 14 Jul 2002 21:13:13 -0400 (EDT) Art Houle <[email protected]> wrote: > > > We are using QOS to preferentially drop packets that represent > file-sharing (kazaa, gnutella, etc). This saves us 40Mbps of traffic > across our multiple congested WAN links. The trick is to mark packets > meaningfully. Also, the WFQ introduces some additional latency at our > edge. Is this different from port filtering as is commonly done with, e.g., gnutella ? Or, to put it another way, how are the packets marked ? And why not just drop them then and there, instead of later ? Regards Marshall Eubanks > > On Sun, 14 Jul 2002, Stephen J. Wilcox wrote: > > > > > Well, end of the week and the responses dried up pretty quickly, I think > thats a > > response in itself to my question! > > > > Okay, heres a summary which was requested by a few people: > > > > Other people too are interested in my questions, they dont implement QoS in > any > > saleable manner and wonder how it can be done and whats actually required. > > > > A number of people think QoS was interesting for a while but that its never > > either found its true use or is dead. > > > > There are unresolved questions from a customer point of view as to what > they are > > actually going to get, what difference it will make and how they can > measure > > their performance and the improvements from QoS. > > > > There is a real demand for guaranteed bandwidth, however this tends to be > in the > > form of absolute guarantees rather than improvements above "normal" hence > > ATM remaining a popular solution. > > > > There is a requirement to differentiate voice traffic, however this is > > necessarily done by the network anyway in order to offer the service, this > being > > the case the customer doesnt pay extra or gets to know much about how all > the > > fancy bits are done. > > > > > > On the face of it this is all negative. Nobody has responded saying there > are > > genuine requirements for services to be offered to customers. Nor has > anybody > > responded with any descriptions of implementations. > > > > I conclude either the people doing this are successful and keep their > secret > > safe or the world is yet to sell largescale QoS across IP. > > > > Steve > > > > > > On Mon, 8 Jul 2002, Stephen J. Wilcox wrote: > > > > > > > > Hi all, > > > I've been looking through the various qos/cos options available, my > particular > > > area was in how IP (MPLS perhaps) compares and can be a substitute for > ATM. > > > > > > Well, theres lots of talk and hype out there, from simple IP queuing eg > cisco > > > priority queuing, rsvp, diffserv, mpls traffic engineering etc > > > > > > But two things are bugging me.. > > > > > > 1. To what extent have providers implemented QoS for their customers > > > > > > 2. Hype aside, to what extent do customers actually want this (and by > this I > > > dont just mean that they want the latest QoS because its the 'latest > thing', > > > there has to be a genuine reason for them to want it). And this takes me > back to > > > my ATM reference where there is a clear major market still out there of > ATM > > > users and what would it take to migrate them to an IP solution? > > > > > > Also, how are people implementing bandwidth on demand (dynamic allocation > > > controlled by the customer) solutions to customers > > > > > > Cheers > > > > > > Steve > > > > > > > > > > > > > > > > > > > > Art Houle e-mail: [email protected] > Academic Computing & Network Services Voice: 850-644-2591 > Florida State University FAX: 850-644-8722 >
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