From: Pavel Bykov (slidersv@gmail.com)
Date: Tue Mar 24 2009 - 22:10:38 ART
Think about the requirements.
What is being asked? The thing that should pop into your mind immediately is
two continuous rates.
Therefore, only 2R3C (two rate three color policer) will do the job.
Option 2 is therefore out of the question.
Option 1 and 3 are similar. 1 is configured using legacy CAR and 3 is
configured using MQC and CIR/PIR combination with proper actions.
But option 1 is tiny bit less precise then option 3. So Option 3 is he best.
Also, in practice, 3 would be preferred, because we don't want use legacy
unless there is a good reason, and I don't see this reason from here.
On Sun, Mar 22, 2009 at 9:36 AM, Le Ba Duy Man <manlbd.hcm@ct-in.com.vn>wrote:
> Hi group,
>
>
>
> I have the following scenario: Configure the router that traffic coming in
> that conforms to the guaranteed banwidth (2.5Mbps) is marked with an MPSL
> EXP 1. Traffic in excess the guaranteed rate but within the burst rate
> (7Mbps) should be marked with an MPLS EXP 0. Traffic in excess of the burst
> rate should be drop.
>
> I have three possile solution for this
>
> 1. Using CAR
>
> interface FastEthernet0/0
>
> rate-limit input 2496000 468750 468750 conform-action
> set-mpls-exp-transmit
> 1 exceed-action continue
>
> rate-limit input 7000000 1312500 1312500 conform-action
> set-mpls-exp-transmit 0 exceed-action drop
>
>
>
> 2. Using MQC one rate, three color policing
>
> policy-map 1RATE_3COLOR
>
> class class-default
>
> police cir 2500000 bc 39062 be 109375
>
> conform-action set-mpls-exp-transmit 1
>
> exceed-action set-mpls-exp-transmit 0
>
> violate-action drop
>
>
>
> 3. Using MQC two rate, three color policing
>
> policy-map 2RATE_3COLOR
>
> class class-default
>
> police cir 2500000 pir 7000000
>
> conform-action set-mpls-exp-transmit 1
>
> exceed-action set-mpls-exp-transmit 0
>
> violate-action drop
>
>
>
> Which one is the most correct and why?
>
> Thanks,
>
> Rin
>
>
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