From: san (san.study@gmail.com)
Date: Thu Jun 29 2006 - 13:27:07 ART
which is the right answer . Both the answers gets mark ?
class CRITICAL
shape average 96000
bandwidth 84
or
class CRITICAL
bandwidth 84
shape peak 84000 16000 2304
On 6/29/06, Chris Lewis <chrlewiscsco@gmail.com> wrote:
>
> Just a note of caution here. The shaper can only utilize the Be tokens if
> credit has been built up, meaning that the shaper has been transmitting at
> below CIR for a period of time. Be does not allow you to constantly
> transmit
> at a rate above CIR, it is only available if traffic has dropped below
> CIR.
> Over time, you should still acerage out at CIR.
>
> Chris
>
>
> On 6/29/06, Elias Chari <elias.chari@gmail.com> wrote:
> >
> > Andy,
> >
> > It is when you configure shape peak 96000 (not average) that you get
> upto
> > 192k.
> >
> > If not specified bc and be default to the same value, then peak = 2*CIR
> as
> > per the formula. Also if only cir and bc are specified the bc value is
> > used
> > for be
> >
> > Rack1R1#sh policy-map int s0/1
> > Serial0/1
> >
> > Service-policy output: testB
> >
> > Class-map: testB (match-all)
> > 0 packets, 0 bytes
> > 5 minute offered rate 0 bps, drop rate 0 bps
> > Match: any
> > Queueing
> > Output Queue: Conversation 265
> > Bandwidth 84 (kbps) Max Threshold 64 (packets)
> > (pkts matched/bytes matched) 0/0
> > (depth/total drops/no-buffer drops) 0/0/0
> > Traffic Shaping
> > Target/Average Byte Sustain
> Excess Interval Increment
> > Rate Limit bits/int bits/int (ms) (bytes)
> > *192000/96000 1992 7968 7968 83 1992*
> >
> > Adapt Queue Packets Bytes Packets Bytes Shaping
> > Active Depth Delayed Delayed Active
> > - 0 0 0 0 0 no
> >
> > Class-map: class-default (match-any)
> > 0 packets, 0 bytes
> > 5 minute offered rate 0 bps, drop rate 0 bps
> > Match: any
> > On 6/29/06, Anderson Mota Alves <mota_anderson@hotmail.com> wrote:
> > >
> > > Hi Petr,
> > >
> > > Based on your explanation below it's more clear to me that you cannot
> > mix
> > > "priority" and "shape" because one is for policing and the other for
> > > shaping purposes.
> > >
> > > But I've been seaching in cisco webpage and from the link below it
> says:
> > >
> > > You can specify two types of traffic shaping; average rate shaping and
> > > peak rate shaping. Average rate shaping limits the transmission rate
> to
> > > the CIR. Using the CIR ensures that the average amount of traffic
> being
> > > sent conforms to the rate expected by the network.
> > >
> > > Peak rate shaping configures the router to send more traffic than the
> > > CIR. To determine the peak rate, the router uses the following
> formula:
> > >
> > > peak rate = CIR(1 + Be / Bc)
> > >
> > >
> >
> http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_reference_chapter09186a0080087f34.html#wp1077189
> > >
> > >
> > > But how do I know that configuring the "shape average 96000" I can
> send
> > > traffic up to 192 kbps?
> > >
> > > Thanks,
> > >
> > > Andy
> > >
> > > --------------------------------------------------------------------
> > >
> > > From: "Petr Lapukhov" <petr@internetworkexpert.com>
> > > To: "Anderson Mota Alves" <mota_anderson@hotmail.com >,
> > > <ccielab@groupstudy.com>
> > > Subject: Re: Doubt in QoS
> > > Date: Thu, 29 Jun 2006 14:42:55 +0400
> > > >The first one seems to be "almost" correct:
> > > >
> > > >You shape (limit) traffic up to 96kbit here - the only problem
> > > >is "peak" keyword. This configuration actually permits you to send
> > > >traffic up to 192kbit by default. So I would better do something
> > > >like:
> > > >
> > > >...
> > > >class CRITICAL
> > > > shape average 96000
> > > > bandwidth 84
> > > >...
> > > >
> > > >This way you guarantee 84k in case of congestion,
> > > >and limit flow up to 96k in any case.
> > > >
> > > >As for your second example - you can not mix priority and bandwidth:
> > > >
> > > >R6(config-pmap-c)#priority 64
> > > >R6(config-pmap-c)#bandwidth 92
> > > >Must remove priority configuration from this class first.
> > > >
> > > >Also remember that you cannot mix "priority" and "shape",
> > > >and dont forget that "priority" actually police your traffic in
> > > >case of congestion.
> > > >
> > > >Finally, you may choose "police" instead of "shape", with
> > > >your first example. The decision should depend on task wording.
> > > >
> > > >HTH
> > > >---
> > > >Petr Lapukhov, CCIE #16379
> > > >petr@internetworkexpert.com
> > > >
> > > >Internetwork Expert, Inc.
> > > >http://www.InternetworkExpert.com <http://www.internetworkexpert.com/
> >
> > > >Toll Free: 877-224-8987
> > > >Outside US: 775-826-4344
> > > >
> > > >----- Original Message ----- From: "Anderson Mota Alves"
> > > ><mota_anderson@hotmail.com>
> > > >To: <ccielab@groupstudy.com>
> > > >Sent: Thursday, June 29, 2006 2:16 PM
> > > >Subject: Doubt in QoS
> > > >
> > > >
> > > >>Hi gurus, The question I need to complish is the following:
> > > >>
> > > >>Which configuration provides the mission-critical traffic class
> > > >>with a
> > > >>minimum
> > > >>
> > > >>bandwidth guarantee of 84 kbps and a maximum upper bandwidth limit
> > > >>of 96
> > > >>
> > > >>kbps?
> > > >>
> > > >>I think I have to solution for this one but I'm not sure if I'm
> > > >>right:
> > > >>
> > > >>policy-map shape
> > > >>class mission-critical
> > > >>bandwidth 84
> > > >>shape peak 96000
> > > >>
> > > >>or
> > > >>
> > > >>policy-map shape
> > > >>class mission-critical
> > > >>priority 64
> > > >>bandwidth 96
> > > >>
> > > >>Could anyone tell me which one I could use? Also I don't know if in
> > > >>order
> > > >>to use the shape peak I need to first configure the shape cir ir
> > > >>order to
> > > >>make sure that this will be the peak above the Cir.
> > > >>
> > > >>Thanks
> > > >>
> > >
> >
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> > >
> > >
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-- Thanks & Rgds SAN
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