[45802] in North American Network Operators' Group
Re: Cisco PPP DS-3 limitations - 42.9Mbpbs?
daemon@ATHENA.MIT.EDU (Alex Rubenstein)
Wed Feb 20 12:37:55 2002
Date: Wed, 20 Feb 2002 12:37:17 -0500 (Eastern Standard Time)
From: Alex Rubenstein <alex@nac.net>
To: "Stephen J. Wilcox" <steve@opaltelecom.co.uk>
Cc: Randy Bush <randy@psg.com>, "nanog@merit.edu" <nanog@merit.edu>
In-Reply-To: <Pine.LNX.4.21.0202201602350.13061-100000@staff.opaltelecom.net>
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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 --
