North American Network Operators Group|
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical
Re: QoS/CoS in the real world?
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. 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@example.com. Academic Computing & Network Services Voice: 850-644-2591 Florida State University FAX: 850-644-8722