From: Pavel Bykov (slidersv@gmail.com)
Date: Tue Jan 20 2009 - 10:59:00 ARST
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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