The Qos PipeDream [Was: RE: Two Tiered Internet]

Marshall Eubanks tme at multicasttech.com
Fri Dec 16 03:46:17 UTC 2005


Hello Dave;

This won't open for me.

Do you have a pdf of these slides ?

Regards;
Marshall

On Dec 15, 2005, at 10:39 PM, David Meyer wrote:

> On Thu, Dec 15, 2005 at 07:34:56PM -0800, David Meyer wrote:
>> On Fri, Dec 16, 2005 at 03:29:29AM +0000, Christopher L. Morrow  
>> wrote:
>>>
>>> On Thu, 15 Dec 2005, John Kristoff wrote:
>>>
>>>>
>>>> On Thu, 15 Dec 2005 19:15:49 -0500 (EST)
>>>> Sean Donelan <sean at donelan.com> wrote:
>>>>
>>>>> AT&T, Global Crossing, Level3, MCI, Savvis, Sprint, etc have sold
>>>>> QOS services for years. Level3 says 20% of the traffic over its
>>>>
>>>> What do they mean by QoS?  Is it IntServ, DiffServ, PVCs, the  
>>>> law of
>>>
>>> I think also mostly this applies to private network things as  
>>> well...
>>> which mostly ends up being: "backups get 20% of the pipe and  
>>> oracle-forms
>>> gets 70%" (or some variation on that mix... what with 8 queues or  
>>> whatever
>>> on the private network you can just go to town :) )
>>>
>>> Speaking to MCI's offering on the public network it's (not sold  
>>> much) just
>>> qos on the end link to the customer... It's supposed to help VOIP  
>>> or other
>>> jitter prone things behave 'better'. I'm not sure that we do much  
>>> in the
>>> way of qos towards the customer aside from respecting the bits on  
>>> the
>>> packets that arrive (no remarking as I recall). So, what does  
>>> this get you
>>> aside from 'feeling better' ?
>>>
>>>> averages or something else?  I've had to deploy it on a campus  
>>>> network
>>>> and in doing so it seems like I've tread into territory where  
>>>> few if
>>>> any big networks are to be found.  Nortel apparently removed  
>>>> DiffServ
>>>
>>> most large networks (as was said a few times I think) don't  
>>> really need it
>>> in their cores. I think I've seen a nice presentation regarding the
>>> queuing delay induced on 'large pipe' networks, basically showing  
>>> that qos
>>> is pointless if your links are +ds3 and not 100% full. Someone  
>>> might have
>>> a pointer handy for that?
>
> 	You might check slides 35-38 in
>
> 	 http://www.1-4-5.net/~dmm/sprintlink_and_mpls.ppt
>
> 	Dave
>




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