AT&T MPLS / BIB Routers

Mikeal Clark mikeal.clark at gmail.com
Thu Feb 17 09:04:51 CST 2011


The routers are Edgemarc.  P/N EM-4608T4

http://www.edgewaternetworks.com/edgemarc_overview_page.htm


On Thu, Feb 17, 2011 at 8:19 AM, Ryan Finnesey <
ryan.finnesey at harrierinvestments.com> wrote:

> What type of hardware are they using for this BIB router?
>
> Cheers
> Ryan
>
>
> -----Original Message-----
> From: Mikeal Clark [mailto:mikeal.clark at gmail.com]
> Sent: Wednesday, February 16, 2011 6:16 PM
> To: Jim Gettys
> Cc: nanog at nanog.org
> Subject: Re: AT&T MPLS / BIB Routers
>
> I'm building up to 3000-4000ms latency with these BIB routers.  We never
> had this issue on the old point to points using Cisco gear.
>
> On Wed, Feb 16, 2011 at 5:09 PM, Jim Gettys <jg at freedesktop.org> wrote:
>
> > On 02/16/2011 05:44 PM, Mikeal Clark wrote:
> >
> >> We just put in a AT&T MPLS and are having a pretty negative
> >> experience with the "Business in a Box" routers they are using for
> >> our smaller sites.  We are seeing extremely high latency under load.
>
> >> Anyone have any experience with these devices that could shed some
> >> light on this?  Are they really this bad?
> >>
> >>
> > There is excessive buffering in all sorts of devices all over the
> Internet.
> > This causes high latency under load (along with higher packet losses,
> > and lots of other problems.
> >
> > It's what I've been blogging about on http://gettys.wordpress.com.
> > These buffers fill; and they are so large they have defeated TCP
> > congestion avoidance to boot, with horrifying consequences.
> >
> > So far, I've found this problem (almost) everywhere I've looked:
> >        o ICSI has good data that bufferbloat is endemic in DSL, Cable,
>
> > and FIOS.  Delays are often measured in seconds (rather than
> milliseconds).
> >        o some corporate and ISP networks run without AQM, in
> > circumstances that they should.
> >        o Windows, Mac OSX and Linux all have bufferbloat in their
> > network stacks, at a minimum on recent network device drivers, and
> often elsewhere.
> >        o Every home router I've tested is horrifyingly bad.
> >        o 3g networks & 802.11 have this in spades.
> >
> > Why should AT&T's MPLS be any different?
> >
> > My next topic will be "transient" bufferbloat, having to do with
> > defeating slowstart.
> >
> > Come start helping fix this: please join us at bufferbloat.net, as we
> > try to get people to fix it.  Already there are some experimental
> > patches for the Linux Intel wireless driver.
> >                        Jim Gettys
> >                        Bell Labs
> >
> >
>



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