From: Darby Weaver (ccie.weaver@gmail.com)
Date: Wed Jan 21 2009 - 03:25:14 ARST
After our discussion last night... Pavel I think you will have little to no
problems when you go to your lab my friend.
Good Luck!
Darby
On 1/20/09, Pavel Bykov <slidersv@gmail.com> wrote:
>
> Uh...
> Net He,
> that's not how interfaces work.
> You cannot send at any other speed then the interface speed. Interface can
> have either on or off state - don't forget that it's digital.
> Check out chapter on test setup in the following document to understand the
> need for queueing:
> http://www.boxoid.org/cisco/MAX-RESERVED-BANDWIDTH-AND-CBWFQ.pdf
> 75% utilization is counted using packets over time and with such high
> utilization, there is 99% chance that router is queuing like crazy. The
> only
> scenario this would not be true is if you had shapers in the path before or
> if you'd use real time operating systems.
>
>
> Raul: Policing can mark/remark packets that exceed rate, so policing with
> "set-de-transmit" as exceed action could work for you. But to tell the
> other
> router what to do... um... You could write a complecated EEM script. Or
> maybe just use something like "frame-relay congestion threshold de 75"? Can
> you use foresight messages?
> Telling othber routers what to do without FECN/BECN could be complicated.
> You could tell end-hosts what to do, by dropping packets...
>
>
>
> On Tue, Jan 20, 2009 at 3:12 AM, NET HE <he_net@hotmail.com> wrote:
>
> > Since the condition is 70% utilization of bandwidth, in other words,
> there
> > is no congestion. So congestion management of using queues can't be used.
> > And congestion avoidance works on queues instead of bandwidth
> utilization,
> > so congestion avoidance is not an option either.
> >
> > Traffic shaping can't set bits to inform other network nodes, so it is
> > excluded.
> >
> > Traffic policing can set bits based on bandwidth utilization, but the
> bits
> > are to inform downstream network instead of upstream network.
> >
> > Best Regards,
> > Net (Xin) He
> >
> >
> >
> >
> > > Date: Mon, 19 Jan 2009 19:32:16 +0400
> > > Subject: Re: Policing or Shaping
> > > From: ccie.tobe81@gmail.com
> > > To: sadiqtanko@gmail.com
> > > CC: slidersv@gmail.com; ccielab@groupstudy.com
> >
> > >
> > > Hi,
> > >
> > > Local router needs to inform remote router that network is congested
> and
> > > remote router needs to slow down packet forwarding once traffic
> > utilization
> > > on FR interface of local router will reach 75%. Don't use FECN or BECN.
> > >
> > >
> > > HTH
> > >
> > > On Mon, Jan 19, 2009 at 7:16 PM, Sadiq Yakasai <sadiqtanko@gmail.com>
> > wrote:
> > >
> > > > Well, cos of "and we need to inform remote router that there is
> > congestion
> > > > in network.", I would tend to think we need to inform the remote
> router
> > that
> > > > there is congestion on the network, so that an immediate action would
> > be
> > > > taken.
> > > >
> > > > I think there isnt enough information from the question to provide an
> > > > exactly solution.
> > > >
> > > > Anyways, just my 2 cents.
> > > >
> > > > Sadiq
> > >
> > >
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> >
> >
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>
>
> --
> Pavel Bykov
> ----------------
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