Re: QOS - bandwidth, shape, police

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
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> >
> >
> >
> >
> >
> >
>

-- 
-
"The more I learn the less I know". This is incredibly frustrating to me.
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