Re: QOS: police rate ???

No problems my friend. So you see that the BC is very important aspect of
the configuration/design and that is why Cisco recommends NOT to configure
the BC (If you are NOT sure) and the IOS uses CIR/32 or 1500 or which ever
is less.

On Thu, Dec 23, 2010 at 11:05 AM, Jack Router <pan.router_at_gmail.com> wrote:

> Thanks Narbik,
> I did the test that you suggested on Ethernet and also on FR. In order to
> let pass ping of 1500 bytes, BC must be 1514 on Ethernet but only 1503 on
> Frame Relay. This is an eye opener !!!
>
>
> On 22 December 2010 01:20, Narbik Kocharians <narbikk_at_gmail.com> wrote:
>
>> Typically YES they are. But remember that when you use Class based
>> Policing the layer 2 overhead is NOT considered.
>>
>> Try this lab and it will show you what i am talking about.
>>
>> R1 (F0/0) ------------------- (F0/0) R2 (F0/1)
>> -------------------------------(F0/1) R3
>>
>> configure a class based policing with a rate of 1m and a BC value of 1500
>> and apply it to R2's F0/1 outbound.
>> On R1 ping R3 with a size of 1500 and a repeat count of 1, and you will
>> see that the ping will fail. A common mistake that i see people make is they
>> look at the policing rate and NOT the BC value. Once you test this, you will
>> see that the BC is extremely important.
>>
>> But as far as what you were mentioning, i don't see any difference between
>> the two.
>>
>>
>> On Wed, Dec 22, 2010 at 4:00 PM, Jack Router <pan.router_at_gmail.com>wrote:
>>
>>> Yes, but what happens when police rate is applied on physical interface ?
>>> Is
>>> it the same as police cir ?
>>>
>>> In my lab:
>>> R1----(F0/0)R2(F0/1)----R3
>>>
>>> On R2 there are two policy-maps to limit icmp to 1%:
>>>
>>> policy-map TEST0
>>> class TEST0
>>> police cir percent 1
>>> conform-action transmit
>>> exceed-action drop
>>>
>>> policy-map TEST1
>>> class TEST1
>>> police rate percent 1
>>> conform-action transmit
>>> exceed-action drop
>>>
>>> TEST0 is applied on input of F0/0
>>> TEST1 is applied on input of F0/1
>>>
>>> Now, when I ping R3 from R1 and R1 from R3 results are excactly the same.
>>> Are then "police cir percent" and "police rate percent" THE SAME ? My
>>> test
>>> tells me that they behave the same way, is there a difference in the way
>>> they work inside the router or even not that ?
>>>
>>>
>>> On 21 December 2010 14:28, Deepak Ahuja <deeps.ccie_at_gmail.com> wrote:
>>>
>>> > Its a clear reference to COPP not General Policing
>>> >
>>> > HTH
>>> > Deepak
>>> >
>>> > On Tue, Dec 21, 2010 at 6:03 PM, Jack Router <pan.router_at_gmail.com>
>>> wrote:
>>> > > Hello,
>>> > >
>>> > > What for is "police rate" ? There is very little information about
>>> this
>>> > > command. Even Cisco mentions it only twice in a 1100 page QOS
>>> > configuration
>>> > > guide 12.4:
>>> > >
>>> >
>>> http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/12_4t/qos_12_4t_book.pdf
>>> > >
>>> > > According to this document:
>>> > >
>>> > > CISCO-CLASS-BASED-QOS-MIB was extended to manage control plane QoS
>>> > policies,
>>> > > and the police rate command was introduced to support traffic
>>> policing on
>>> > > the basis of packets per second for control plane traffic.
>>> > >
>>> > > Taking into consideration that "police rate" is meant to manage
>>> control
>>> > > plane, what it does when it is attached to physical interface (not
>>> > > control-plane) ?
>>> > >
>>> > >
>>> > > Blogs and organic groups at http://www.ccie.net
>>> > >
>>> > >
>>> _______________________________________________________________________
>>> > > Subscription information may be found at:
>>> > > http://www.groupstudy.com/list/CCIELab.html
>>> > >
>>> > >
>>> > >
>>> > >
>>> > >
>>> > >
>>> > >
>>> > >
>>> >
>>> >
>>> >
>>> > --
>>> > Regards
>>> > Deepak Ahuja
>>> > CCIE#19545(R&S/SP)
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>> --
>> *Narbik Kocharians
>> *CCSI#30832, CCIE# 12410 (R&S, SP, Security)
>> www.MicronicsTraining.com <http://www.micronicstraining.com/>
>> Sr. Technical Instructor
>> *Ask about our FREE Lab Voucher with our Boot Camps*
>> YES! We take Cisco Learning Credits!
>> Training & Remote Racks available
>>
>>
>

-- 
*Narbik Kocharians
*CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com <http://www.micronicstraining.com/>
Sr. Technical Instructor
*Ask about our FREE Lab Voucher with our Boot Camps*
YES! We take Cisco Learning Credits!
Training & Remote Racks available
Blogs and organic groups at http://www.ccie.net