Traffic Policing aims to limit the traffic rate to less than the physical rate of the interface, limit the traffic rate for particular classes and re-mark traffic.
Traffic Shaping aims to slow down the traffic rate to a value less than the physical rate, often to comply with SLA's. It is also able to shape traffic of different classes to different bit-rates.
- Shaping and policing both measure the traffic rate (sometimes within classes)
- Policing can be applied out and inbound, whereas shaping can only be done outbound.
- Shaping buffers excess packets (requiring extra memory), policing drops or re-marks traffic.
- Only policing can re-mark traffic
- Only traffic shaping can respond to network conditions and signals.
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