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RE: QOS or more bandwidth
- From: Pete Kruckenberg
- Date: Tue May 29 11:30:29 2001
On Tue, 29 May 2001, Ukyo Kuonji wrote:
> The problem is, while most vendors support tagging and
> priority queuing, non of the current vendors can support
> true end to end QoS. Instead, we have taken to calling
> their options CoS.
The elusive "end-to-end QoS" seems to be a network
management issue, motivated primarily by the number of knobs
(and some featuritis) and lack of QoS best-practice (because
there's just not a lot of QoS practice, period).
Simple end-to-end technologies (TOS, DiffServ) are enough to
handle congestion-management QoS strategies (and some
differentiated services), are interoperable across most
vendors, and are supported in most edge- and core-class
devices.
Beyond simple QoS schemes, the complexity mandates an
end-to-end management tool. I suspect the cost/benefit curve
gets pretty flat above a simple QoS strategy, and anything
more complex has diminishing marginal value.
Any studies been done on cost/benefit of QoS, it'd be
interesting to see where the technical/business case is
compelling and where it makes no sense.
Pete.
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