From: Joel Amao (femmy79@hotmail.com)
Date: Thu Oct 18 2007 - 21:23:59 ART
The packet would still be sent. There is no way to delay it forever, it is the
next TC that will suffer.
If the router has 5 credit left in a Tc and it receives 100 bytes of packet,
it will send the 100 byte and any excess will be deducted from the next TC.
In this case, Assuming my BC is 900, then during the next interval i can only
send (900 -(100*8)) = 100
Joel Amao
CCIE#18128
> Date: Thu, 18 Oct 2007 16:55:12 -0400> From: ggombas@gmail.com> To:
asawilunda@googlemail.com> Subject: Re: Effect of shaping with small Bc, no
fragmentation, and a large packet?> CC: ephillips@squick.cc;
ccielab@groupstudy.com> > 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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