Re: 3 colour policing single rate and three colour policing

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> 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] 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>
> 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
> >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
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > --
> > Garry L. Baker
> >
> > "There is no 'patch' for stupidity." - www.sqlsecurity.com
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
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Received on Sun Oct 18 2009 - 12:34:54 ART