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RE: QOS or more bandwidth
From: "Kavi, Prabhu" <prabhu_kavi () tenornetworks com>
Date: Tue, 29 May 2001 15:30:00 -0400

Everything that you said is correct.  However, you missed one
important part of QoS, which is TE.  TE is about avoiding congestion 
in the first place by more efficiently using all of the bandwidth
you already have in the network.  To that extent, it is a substitute
for adding more pipe.

Prabhu Kavi                     Phone:  1-978-264-4900 x125 
Director, Adv. Prod. Planning   Fax:    1-978-264-0671
Tenor Networks                  Email:  prabhu_kavi () tenornetworks com
100 Nagog Park                  WWW:    www.tenornetworks.com
Acton, MA 01720

-----Original Message-----
From: Eric A. Hall [mailto:ehall () ehsco com]
Sent: Tuesday, May 29, 2001 3:20 PM
Cc: nanog () merit edu
Subject: Re: QOS or more bandwidth

So, what problem is QoS solving?

QoS is about choosing the packets that you are willing to 
drop or delay
when congestion arises. If you aren't willing to drop/delay 
any of them,
then you must over-provision.

Regarding the existant thread, adding engineers and equipment will not
give you more bandwidth, but instead it allows you to be more 
efficient in
your packet disposal routines. They are not a substitue for pipe.

Eric A. Hall                                        
Internet Core Protocols          http://www.oreilly.com/catalog/coreprot/

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