The MPLS-OPS Archive

[Santiago Alvarez <saalvare@cisco.com>]

>From the experience of real-life deployments, traffic policing is done
both when the CE is managed and unmanaged.  This allows you to do the
differentiated marking according to a traffic profile.

I'd also suggest you consider the class-based traffic policer for rate
limiting traffic.  It has the benefit of being part of the modular qos
cli and provides greater functionality.

SA
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CEW CEW wrote:
> 
> Hi..
> 
> Appologised for the long email, but would
> appreciate if anyone could share some of his/her
> experience on the above. I am using 7200 as the PE and
> GSR as the P routers.
> 
> In summary, I have 2 options :
> 
> (1)Policing
> - CAR at ingress and egress of PE-CE link for
> unmanaged CE scenario
> - CAR at ingress and egress of CE-PE link for
> maanaged CE scenario, i.e shift the CAR operation to
> the CE.
> - disadvandage = no spill over, i.e, if u provision
> 300Kbps of bandwidth for gold class traffic, other
> classes will not be able to use this 300Kbps of
> bandwidth even if there is no gold class traffic.
> - advantage = simple configuration
> 
> (2)CBWFQ with class based shaping
> - for managed CE scenario
>   CBWFQ with class based shaping at egress of CE-PE
> link. No policing/rate limit at the PE as the CE will
> shape the traffic out accordingly.
> CBWFQ with class based shaping is also done at egress
> of PE-CE link
> 
> - for unmanaged CE scenario
>    police using CAR at ingress and egress of PE-CE
> link
> - disadvandage = complex configuration
> - advantage = have spill over capability
> 
> For the Core, i will be using CBWFQ and MDRR for
>  both approaches.
> 
> I hav done some testing in the lab on the 2
> approaches. Option 1 is quite commonly used. Option
>  2 is some thing that is quite new. Would like to know
> if anyone has deployed in a live MPLS VPN network b4 ?
> 
> Thanks
> Jeff
> 
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