OK good. The ISP in this case is a backbone carrier so the DE would get
dropped when I get to the CO. Thanks!
----- Original Message -----
From: "Chuck Larrieu"
To: "Mike Mandulak" ;
Sent: Wednesday, August 08, 2001 9:59 AM
Subject: RE: DE bits [7:15210]
> The DE bit is significant only on the frame cloud.
>
> yes, this can be transferred from carrier to carrier. for example, if you
> have a frame circuit between Portland OR and San Diego, CA you are
crossing
> LATA boundaries, and a RBOC boundary, so must use at least two carriers.
In
> that case, your CIR is significant end to end across the frame clouds of
two
> carriers.
>
> in the case of an internet connection, one would hope that the ISP pop is
in
> the same town, and that they use a different carrier onto the internet
> backbone, so there would be no transfer of the DE bit onto any internet
> backbone.
>
> I should clarify by saying that the CIR is significant only to your end to
> end circuit. The termination of that circuit into another router ends the
> layer two framing. Even if the data were forwarded by that router onto
> another frame circuit from the same carrier, a new layer two frame would
> still be built, and no DE bit would have been set.
>
> Zero CIR is not necessarily a bad thing. Lot's of companies do things like
> that to minimize their costs. OTOH, I thought most carriers these days
were
> not selling zero CIR, for that same reason.
>
> Yes, your router will try to pump out a T1 worth of data if it has it. In
> general, though, chances are good that you are not attempting to fully
> utilize the line. It is only when your carrier frame cloud is seeing more
> traffic than it can handle that frames with the DE bit are dropped.
>
> HTH
>
> Chuck
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Mike Mandulak
> Sent: Wednesday, August 08, 2001 4:33 AM
> To: [EMAIL PROTECTED]
> Subject: Fw: DE bits [7:15210]
>
>
> ----- Original Message -----
> From: "Mike Mandulak"
> To: "Chuck Larrieu"
> Sent: Wednesday, August 08, 2001 6:31 AM
> Subject: Re: DE bits [7:15210]
>
>
> > That's what I thought, when I confronted them on it they basically said
> that
> > since I have a full T1 all traffic will go through. But my Q is if it
has
> DE
> > set through to their CO, does the DE bit stay set as it traverses the
> > internet and thru other providers? Even if it get transformed into say
ATM
> > frames or whatever on it's way? I think they are feeding me a line...
> >
> > ----- Original Message -----
> > From: "Chuck Larrieu"
> > To: "Mike Mandulak" ;
> > Sent: Wednesday, August 08, 2001 1:04 AM
> > Subject: RE: DE bits [7:15210]
> >
> >
> > > nope. with a 0 CIR anything greater than 0 is DE.
> > >
> > > your telco is not guaranteeing that they will ever pass any of your
> > traffic.
> > >
> > > Chuck
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > > Mike Mandulak
> > > Sent: Tuesday, August 07, 2001 9:17 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: DE bits [7:15210]
> > >
> > >
> > > Do discard Eligible bits (DE) get set on lines that are full T1's? The
> > > circuit I'm looking at is a full T1 to one of my internet providers
and
> > when
> > > looking at the frame stats (using cisco LMI) I see that that the cir
is
> > set
> > > to zero which would mean that all frames leave my site with the DE bit
> > set.
> > > Am I misunderstanding this?
> > >
> > > MikeM
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=15385&t=15210
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