From: Eric Phillips (ephillips@squick.cc)
Date: Thu Oct 18 2007 - 21:24:13 ART
Thanks everyone for the replies, I definitely appreciate it!
I did skip a 0 there, sorry... I was aiming for a 10ms Tc to make VOIP
traffic delayed as little as possible. So yes, the Bc would be 640 bits.
Herbert, my numbers were referring to Shaping, so I was keeping everything
in bits. With policing you deal in bytes.
I am very intrigued to see that we have three answers, so perhaps I am not
the only one that is a bit confused by this. If it is queued forever, does
it block the pipe while it is queued?
-Eric
On 10/18/07, Gregory Gombas <ggombas@gmail.com> wrote:
>
> Even with shaping configured, if the router queues the packet then it
> would be queued indefinately considering it will always be larger than
> bc and never be able to send it...
>
> On 10/18/07, Herbert Maosa <asawilunda@googlemail.com> wrote:
> > Eric,
> >
> > I assume you are maintaining bytes as the unit for Bc and ms as the unit
> for
> > TC ? In that case Bc of 64 Bytes and Tc of 10ms is giving me CIR =
> 512Kbps,
> > using the formula CIR = Bc/Tc.
> >
> > In any case, what will happen to a packet that is larger than the
> maximum
> > rate permitted will depend on whether you are shaping or policing. If
> you
> > are shaping, then the packet will simply be queued in the shaping queue
> from
> > which it will then be sent at CIR. If you are policing then it will
> depend
> > on the configured action for non-conforming traffic.
> >
> > Herbert.
> >
> >
> > On 10/18/07, Eric Phillips <ephillips@squick.cc> wrote:
> > >
> > > Hi all,
> > >
> > > I have searched through the GroupStudy archives, read through Odem's
> DQOS
> > > book, and checked out the DOC CD, but have not found a clear answer to
> a
> > > question that has been on my mind.
> > >
> > > If I enable shaping with a very small Bc, for example, a Tc of 10, and
> a
> > > Bc
> > > of 64, that should shape to 64kbit/sec, right? Now if I do not enable
> > > link
> > > fragmentation, and a large packet, perhaps 1400 bytes comes through,
> what
> > > will happen? It can not be sent in a single Tc, and it can not be
> > > fragmented because link fragmentation is disabled. Also assume that I
> > > have
> > > no Be, or a Be too small to allow 1400 bytes to accumulate between Bc
> and
> > > Be.
> > >
> > > This seems like an awfully simple question, but I have not found a
> clear
> > > answer anywhere.
> > >
> > > Thank you very much,
> > >
> > > Eric
> > >
> > >
> _______________________________________________________________________
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> > > http://www.groupstudy.com/list/CCIELab.html
> > >
> >
> >
> >
> > --
> > Kindest regards,
> > hm
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
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