From: Tarun Pahuja (pahujat@gmail.com)
Date: Sat Dec 29 2007 - 16:32:42 ART
There is a lot more you can do on a 3750 ME switch. Have a look at the
following doc, unicast me if you still need assistace:
HTH,
Tarun
On Dec 28, 2007 8:08 AM, <wim.depauw@getronics.com> wrote:
> Hi,
>
> We're testing policing and shaping on 3750 ME switch so our customers BW
> is limited to the bw he orders.
> I did some testing with the above options and came to the following :
> test setup:
>
> PC------------------SW( fa0/1)
>
> On my PC I have a FTP/TFTP server running and I downloaded a file of
> 500KByte to flash and back
>
> 1) Command : SRR-queue bandwidth shape 56000
>
> - Advantage :Doesn't loose any packets UDP/TCP but just delays it ,
> - Disadvantage : You can only configure it on a egress queue so when you
> upload a file to the PC your bw gets a lot higher then configured .This is
> because you only send ACK back to the SW which are very small in size.
>
> 2) Command : service-police input test
>
> policy-map test
> class class-default
> police 56000 8000 exceed-action drop
>
> -disadvantage : Only configured on input direction , output is not
> supported
> UDP traffic is dropped so a lot of retries are sended which
> leads to the not required perfomance ( instead of 56 Kb/s I had 1 Kb/s for
> UDP traffic )
> -Advantage : For TCP traffic I got around 40 Kb/sec without any drops.Ithink for a bigger file it will give me my required speed.
>
> 3)Command Storm-control unicast level 56000
>
> Advantage : It limits as well my UDP/TCP traffic with minimal drops
> Disadvantage: Speed goes very irregular( fast then slow ) , also I
> noticed when I upload to the PC my limitation is not working as it supposed
> to be.
> I tried it with a bigger file of 5 MB and I got a upload speed of 2,4Mb/s.
> Most likely storm-control is also working only on the inbound direction of
> your switch.
>
>
> So there are 3 methods to limit your traffic and they all got their
> disadvantages and to be honest they don't give us the results we want.
>
> Do you know any other possibilities ?
>
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