RE: 3 colour policing single rate and three colour policing

Mike,

The advantage of the dual rate is being able to set parameters on the
exceeding (PIR) and violating traffic rates for further treatment in the
network. This is a brief read http://www.faqs.org/rfcs/rfc2698.html, but
should help some too. I did key into something that you said before the two
questions, the bandwidth allocated to you by your ISP is 4MB. In this case, I
would shape your traffic outbound to meet 4MB.
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800
a3a25.shtml#policingvsshaping

-ryan

From: mike arnold [mailto:haynessmith70_at_gmail.com]
Sent: Sunday, October 18, 2009 4:35 AM
To: Ryan West
Cc: garry baker; Cisco certification
Subject: Re: 3 colour policing single rate and three colour policing with dual
rate.

Hi all,

Am confusing in the policing theory,help will be appreciated,

i want to do police for all traffic class-default, and the bandwith allocated
to me by ISP is 4MB,

what are the preferable configs:

Q1:-- police cir 4000000 conform-action transmit exceed-action transmit
violate-action drop

as i know from above confgs i dont need to specify BC and BE as it calculates
itself by cir/32 and when pir configured pir/32

switch:(config-pmap-c-police)#do sh policy-map 4MB
  Policy Map cisco
    Class test
     police cir 4000000 bc 125000 be 125000
       conform-action transmit
       exceed-action transmit
       violate-action drop

Q2:-- police cir 2000000 pir 4000000 conform-action transmit exceed-action
transmit violate-action drop

just have a look down when i configure the pir statement also there is no
change in be as it is suppose to be double of bc, is it necessary to configure
be while configuring PIR????????

Switch(config-pmap-c-police)#do sh policy-map cisco
  Policy Map cisco
    Class test
     police cir 2000000 bc 62500 pir 4000000 be 62500
       conform-action transmit
       exceed-action transmit
       violate-action drop

What is the advantage by configuring the PIR appose to single-rate as what
actually happens ??? Is it more tokens are send on conform-action that means
double the BC??? ,

Help will lead to success.

On Sat, Oct 17, 2009 at 5:21 PM, Ryan West
<rwest_at_zyedge.com<mailto:rwest_at_zyedge.com>> wrote:
If you all you have to do is drop when exceeding and nothing else, just
configure a 2-color 1 rate. Your customer is either adhering to the policy or
he's not, if he's not he's dropped.

If you want to allow excess sometimes, then you need to figure out what you're
willing to accept and what to do with the excess. I would re-read that first
link, it explains the concepts well.

-ryan

-----Original Message-----
From: nobody_at_groupstudy.com<mailto:nobody_at_groupstudy.com>
[mailto:nobody_at_groupstudy.com<mailto:nobody_at_groupstudy.com>] On Behalf Of mike
arnold
Sent: Saturday, October 17, 2009 8:57 AM
To: garry baker
Cc: Cisco certification
Subject: Re: 3 colour policing single rate and three colour policing with dual
rate.

Hi,

Am at provider end ,If the customer ask to allocate with a 4 MB of pipe and
he ready to accept drop when traffic exceed, Being me at ISP end what's my
job to protect my network to be overrun?? and what policer should i
configure??? single rate or dual rate???

Thanks,

On Sat, Oct 17, 2009 at 3:31 PM, garry baker
<baker.garry_at_gmail.com<mailto:baker.garry_at_gmail.com>> wrote:

> That really depends on what the SLA is with your provider (if that is the
> case), and the level of drops your traffic can tolerate if you over run
your
> 4MB limit....
>
> Need more details and it is not just a one size fit all answer...
>
> some links:
>
> http://higmc.wordpress.com/qos/shaping-and-policing/
>
> http://www.cciecandidate.com/?p=129
>
> On Sat, Oct 17, 2009 at 1:39 PM, mike arnold
<haynessmith70_at_gmail.com<mailto:haynessmith70_at_gmail.com>>wrote:
>
>> Hello,
>>
>> Can anybody detailed me with good explanation of difference between three
>> colour policer single rate and three colour dual rate.
>>
>> If my requirement bandwidth limitation is 4MB then when do i shld
>> configure
>> single rate and dual rate three colour policer.on whcih situation.
>>
>> Thanks,
>>
>>
>> Blogs and organic groups at http://www.ccie.net<http://www.ccie.net/>
>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>>
>>
>>
>
>
> --
> Garry L. Baker
>
> "There is no 'patch' for stupidity." -
www.sqlsecurity.com<http://www.sqlsecurity.com/>

Blogs and organic groups at http://www.ccie.net<http://www.ccie.net/>
Received on Sun Oct 18 2009 - 08:04:35 ART