Re: QOS - bandwidth, shape, police

Good job Rob

On Wed, Sep 9, 2009 at 1:13 AM, Federico Cossu <federico.cossu_at_gmail.com>wrote:

> what i've learned from a polylab is that shaping is more indicated for tcp
> traffic than policing,
> if you think about how tcp works it will be clear.
>
> /R
>
>
> 2009/9/8 Mark Matters <markccie_at_gmail.com>
>
> > Great info. Thank you everyone.
> >
> > On Tue, Sep 8, 2009 at 2:39 PM, ben edgar <bedgar2500_at_gmail.com> wrote:
> >
> > > Bandwidth =CBWFQ = set a guaranteed minimum amount of bandwidth
> > > LLQ = Priority Command + Bandwidth command
> > >
> > >
> > > Police= sets a maximum amount of bandwidth with no queuing
> > > Shape= set a maximum amount of bandwidth with queuing
> > >
> > >
> > > On Tue, Sep 8, 2009 at 2:20 PM, Wouter Prins<wp_at_null0.nl> wrote:
> > > > Hi Mark,
> > > > If you explain the difference to the three techniques you should be
> > able
> > > to
> > > > pick the right one based on the task wording. Here's a brief summary:
> > > >
> > > > The bandwidth is used in case of congestion on a interface. So when
> > > there's
> > > > no congestion, there's no problem and the class can use more then the
> > > > bandwidth configured.
> > > > Policing is done inbound usually, (it can also be done outbound) and
> is
> > a
> > > > non-friendly way of committing to the configured cir. As it drops, it
> > > doesnt
> > > > queue!
> > > > Shaping is done outbound, and uses queueing. If the queue if full it
> > will
> > > > drop based on WRED or whatever congestion avoidance you configure.
> > > >
> > > > So when you have a 100Mb/s connection to your ISP (based on
> > FastEthernet)
> > > > and you pay for 10Mb/s. The ISP will police you inbound on their
> side.
> > > And
> > > > you have to make sure you adhere to the 10Mb/s outbound so your
> traffic
> > > is
> > > > not dropped the 'hard' way by your isp. :)
> > > >
> > > > Hope this helps!
> > > > Wouter
> > > >
> > > >
> > > > 2009/9/8 Mark Matters <markccie_at_gmail.com>
> > > >
> > > >> I am starting to confuse myself on when to use bandwidth, police or
> > > shape.
> > > >>
> > > >> Based on question wording who do you know what they are asking you
> to
> > > do?
> > > >>
> > > >> Am I right here?
> > > >> Bandwidth = guaranteed bandwidth
> > > >> Police = maximum bandwidth
> > > >> Shape = limit bandwidth
> > > >>
> > > >>
> > > >>
> > > >> R411(config-pmap)#class thisisgoingtodrivemetodrink
> > > >> R411(config-pmap-c)#?
> > > >> QoS policy-map class configuration commands:
> > > >> bandwidth Bandwidth
> > > >> compression Activate Compression
> > > >> drop Drop all packets
> > > >> exit Exit from QoS class action configuration mode
> > > >> netflow-sampler NetFlow action
> > > >> no Negate or set default values of a command
> > > >> police Police
> > > >> priority Strict Scheduling Priority for this Class
> > > >> queue-limit Queue Max Threshold for Tail Drop
> > > >> random-detect Enable Random Early Detection as drop policy
> > > >> service-policy Configure Flow Next
> > > >> set Set QoS values
> > > >> shape Traffic Shaping
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> R411(config-pmap-c)#bandwidth ?
> > > >> <8-2000000> Kilo Bits per second
> > > >> percent % of total Bandwidth
> > > >> remaining % of the remaining bandwidth
> > > >>
> > > >>
> > > >>
> > > >> R411(config-pmap-c)#police ?
> > > >> <8000-2000000000> Bits per second
> > > >> cir Committed information rate
> > > >> rate Specify police rate
> > > >>
> > > >>
> > > >> R411(config-pmap-c)#shape ?
> > > >> adaptive Enable Traffic Shaping adaptation to BECN
> > > >> average configure token bucket: CIR (bps) [Bc (bits) [Be
> > > (bits)]],
> > > >> send out Bc only per interval
> > > >> fecn-adapt Enable Traffic Shaping reflection of FECN as BECN
> > > >> fr-voice-adapt Enable rate adjustment depending on voice presence
> > > >> max-buffers Set Maximum Buffer Limit
> > > >> peak configure token bucket: CIR (bps) [Bc (bits) [Be
> > > (bits)]],
> > > >> send out Bc+Be per interval
> > > >>
> > > >> --
> > > >>
> > > >>
> > > >> -
> > > >> "The more I learn the less I know".
> > > >>
> > > >>
> > > >> Blogs and organic groups at http://www.ccie.net
> > > >>
> > > >>
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> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > > > --
> > > > Wouter Prins
> > > > wp_at_null0.nl
> > > > 0x301FA912
> > > >
> > > >
> > > > Blogs and organic groups at http://www.ccie.net
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> > > >
> > >
> >
> >
> >
> > --
> >
> >
> > -
> > "The more I learn the less I know". This is incredibly frustrating to me.
> >
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-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
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