Re: QOS - bandwidth, shape, police

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
> > >
> > >
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> > >
> > >
> > >
> > >
> >
>
>
>
> --
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> -
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