Re: shape on 3560

Sharing and shaping has nothing to do with priority queueing. I.e.
shaped traffic is not processed before shared - it's only limited to
certain percentage of the traffic, while shared queues are simply
guaranteed a minimum.

You can configure shaping as a percentage of negotiated speed, of
course. By default 100% of interface bandwidth (negotiated speed) is
available for all queues. If you want to limit Q2 to say, 33% you can
configure it as "srr-queue bandwidth shape 0 3 0 0". However, if you
want to limit it to say 5 Mb/s REGARDLESS of the negotiated speed,
this cannot be done on 3560, as this is a policing and policing is not
available in the outbound direction on 3560.

--
Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
FREE CCIE training: http://bit.ly/vLecture
Mailto: markom_at_ipexpert.com
Telephone: +1.810.326.1444
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On Sat, Aug 6, 2011 at 13:19, gp <gs4me2me_at_gmail.com> wrote:
> Thank you Marko for explanation, it helps.
>
> What confusing me if I have a task to guaranteed some traffic for example 10Mbps on giga interface on switch, and I cannot use priority queue, so I want to send that traffic before packet in shared queue in way to put it in shaped queue which will be served before shared queues.
>
> The problem is that I donbt know what type of interface will be connected to my switch (1Gbps or 100M) and that is value from which will be calculated value for shaping on particular queue.
>
> For example:
> Negotiated speed = 1Gbps
> Srr-queue bandwidth shape 0 100 0 0
> Queue 2 will be shaped to 100Mbps
>
> Negotiated speed = 100Mbps
> Srr-queue bandwidth shape 0 100 0 0
> Queue 2 will be shaped to 10Mbps
>
> In other way as I understand there is no way to hard code shape value regarding to negotiated speed?
>
> Regards,
> Gp
>
>
>
>
> -----Original Message-----
> From: Marko Milivojevic [mailto:markom_at_ipexpert.com]
> Sent: Saturday, August 06, 2011 7:42 PM
> To: gp
> Cc: ccielab_at_groupstudy.com
> Subject: Re: shape on 3560
>
> It will be using the bandwidth available to the SRR.
>
> Cat2#sh mls qos interface fa0/18 queueing
> FastEthernet0/18
> Egress Priority Queue : disabled
> Shaped queue weights (absolute) : B 25 0 0 0
> Shared queue weights B : B 25 25 25 25
> The port bandwidth limit : 100 B (Operational Bandwidth:100.0) <<<<<<<
> The port is mapped to qset : 1
>
> See the "port bandwidth limit" line - that's the BW available to the
> SRR. It is derived from the negotiated speed by default, but can be
> limited using "srr-queue bandwidth limit" command on the interface.
>
> Now, let's see if configured bandwidth influences this in any way:
>
> interface FastEthernet0/18
> B bandwidth 50000
> !
>
> Cat2(config-if)#do sh mls qos int fa0/18 qu
> FastEthernet0/18
> Egress Priority Queue : disabled
> Shaped queue weights (absolute) : B 25 0 0 0
> Shared queue weights B : B 25 25 25 25
> The port bandwidth limit : 100 B (Operational Bandwidth:100.0)
> The port is mapped to qset : 1
>
> Doesn't look like it does. If I change the bandwidth limit.
>
> interface FastEthernet0/18
> B bandwidth 50000
> B srr-queue bandwidth limit 25
> !
>
> Cat2(config-if)#do sh mls qos int fa0/18 qu
> FastEthernet0/18
> Egress Priority Queue : disabled
> Shaped queue weights (absolute) : B 25 0 0 0
> Shared queue weights B : B 25 25 25 25
> The port bandwidth limit : 25 B (Operational Bandwidth:27.28)
> The port is mapped to qset : 1
>
> Whenever in doubt - ask IOS :-)
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
> FREE CCIE training: http://bit.ly/vLecture
>
> Mailto: markom_at_ipexpert.com
> Telephone: +1.810.326.1444
> Web: http://www.ipexpert.com/
>
> On Sat, Aug 6, 2011 at 01:18, gp <gs4me2me_at_gmail.com> wrote:
>> Hello experts,
>>
>>
>>
>> When doing shaping on 3560 interface does reference bandwidth is configured
>> bandwidth with bandwidth command or negotiated speed?
>>
>>
>>
>> For example the switch port is connected on Fast Ethernet router interface
>> and I configured bandwidth 1000000 on switch port.
>>
>> With srr-queue bandwidth shape 0 100 0 0, will queue 2 be shaped on 10 or 1
>> Mbps?
>>
>>
>>
>> Thank you!
>>
>>
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