Is anyone actually USING IP QoS?

Steve Riley (MCS) steriley at
Mon May 17 21:04:37 UTC 1999

Nice to see that I'm not the only one believing in the foolishness of QoS
hype. Bandwidth is essentially free, and will always be cheaper than QoS.
And since in the end nearly all decisions are based on economics, it should
be apparent which is the more logical decision.

Allow me to point you to an interesting paper called "Rise of the Stupid
Network." Many of you here may have already seen this. It was written back
in 1997 by David Isenberg, then a reasearcher at AT&T Labs (Isenberg is now
an independent consultant). His paper profoundly changed my views on QoS and
made me realize that networks perform best when we limit how smart they get
and ensure that networks focus on transport only. I urge everyone to read

Isenberg's site:

Steve Riley
Microsoft Telecommunications Practice in Denver, Colorado
    email: mailto:steriley at
    call: +1 303 521-4129 (cellular)
    page: +1 888 440-6249 or mailto:4406249 at
Applying computer technology is simply finding the right wrench to pound in
the correct screw.

-----Original Message-----
From: Vadim Antonov [mailto:avg at]
Sent: Monday, May 17, 1999 12:28 PM
To: nanog at; pete at
Subject: Re: Is anyone actually USING IP QoS?

Yep.  Altough not _all_ QoS schemes are broken-as-designed.  The
most trivial per-packet priority combined with ingress
priority mix shaping works.  Ths idea of end-to-end
whatever reservations or guarantees is usually propounded
by people who either neglected their CS courses or those
who are trying to sell it.

Yep.  The biggest QoS secret is that nobody actually needs
it.  Bandwidth is cheap and is growing cheaper.  The
manpower needed to deploy and maintain QoS is getting
more and more expensive.


More information about the NANOG mailing list