QoS Police values

[Kylie87]

Hello, I’m trying to understand how people calculate the CIR and bc for policing in QoS. For example, with the below QoS example code, I would like to know why/how they chose to use 128k for the CIR and bc 8000 for the committed burst size on the first class, and 5m bc 8000 for the next class? How are these CIR and bc values decided? Is there a formula? I’ve spent a couple hours searching the web now and I haven’t found anything that answers this question. Any help on this issue would be much appreciated.


policy-map Ingress-Policy
class VVLAN-Voice
set dscp ef
police 128k bc 8000
conform-action transmit
exceed-action drop
class VVLAN-Video
set dscp af41
police 5m bc 8000
conform-action transmit
exceed-action drop
class VVLAN-Signaling
set dscp cs3
police 32k bc 8000
conform-action transmit
exceed-action drop