[45806] in North American Network Operators' Group
Re: Cisco PPP DS-3 limitations - 42.9Mbpbs?
daemon@ATHENA.MIT.EDU (Jon Mansey)
Wed Feb 20 15:38:53 2002
Date: Wed, 20 Feb 2002 12:38:08 -0800
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From: Jon Mansey <jon@interpacket.net>
To: nanog@merit.edu
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OMG! Arent we missing the point here? What about never running links above
60% or so to allow for bursts against the 5 min average, and <shudder>
upgrading or adding capacity when we get too little headroom.
And here we are, nickel and diming over a few MBps near to 45M on a DS3...
....
Or has the world changed so much that saturated pipes are The Way Things
Are TM now.
jm
On Wednesday, February 20, 2002, at 09:37 AM, Alex Rubenstein wrote:
>
>
> BTW:
>
> 30 second input rate 13039000 bits/sec, 8055 packets/sec
> 30 second output rate 45531000 bits/sec, 10021 packets/sec
>
> Thats a pa-2t3+ on a flexwan in a 6509.
>
>
>
> On Wed, 20 Feb 2002, Stephen J. Wilcox wrote:
>
>>
>> Hmm, reasonable explanation..
>>
>> presumably this can be improved (a little) with increased interface
>> buffers.. ? and possibly non fifo queuing eg custom queuing in favour of
>> TCP rathen than UDP/ICMP etc which wont have the backoffs
>>
>> Cheers
>>
>> Steve
>>
>> On Wed, 20 Feb 2002, Randy Bush wrote:
>>
>>>> we run HDLC on DS3 and we max at about 40.something too
>>>
>>> if you're using five min (or three min) samples, and you're seeing 70%,
>>> peaks are likely much higher and some users' packets are being dropped.
>>> by 80%, enough packets are being dropped that users are likely to see
>>> the effects of exponential backoff. things do not improve above 80%.
>>>
>>> randy
>>>
>>
>> --
>> Stephen J. Wilcox
>> IP Services Manager, Opal Telecom
>> http://www.opaltelecom.co.uk/
>> Tel: 0161 222 2000
>> Fax: 0161 222 2008
>>
>>
>
> -- Alex Rubenstein, AR97, K2AHR, alex@nac.net, latency, Al Reuben --
> -- Net Access Corporation, 800-NET-ME-36, http://www.nac.net --
>
