Traffic Shaping - HP 4800G Series Configuration Manual

Figure 4-1 Schematic diagram for traffic policing
Traffic policing is widely used in policing traffic entering the networks of internet service providers (ISPs).
It can classify the policed traffic and perform pre-defined policing actions based on different evaluation
results. These actions include:
Forwarding the traffic if the evaluation result is "conforming."
Dropping the traffic if the evaluation result is "excess."
Marking a conforming packet or a non-conforming packet with a new DSCP precedence value and
forwarding the packet.

Traffic Shaping

Traffic shaping supports shaping traffic to the outgoing traffic.
Traffic shaping provides measures to adjust the rate of outbound traffic actively. A typical traffic shaping
application is to limit the local traffic output rate according to the downstream traffic policing parameters.
The difference between traffic policing and GTS is that packets to be dropped in traffic policing are
cached in a buffer or queue in GTS, as shown in
bucket, these cached packets are sent at an even rate. Traffic shaping may result in an additional delay
while traffic policing does not.
Figure 4-2. When there are enough tokens in the token
4-3