Re: QOS - bandwidth, shape, police

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".
>>
>>
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>>
>>
>>
>
>
> --
> Wouter Prins
> wp_at_null0.nl
> 0x301FA912
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Tue Sep 08 2009 - 14:39:59 ART