H3C S5810 Series, Руководство по эксплуатации

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4-3
Figure 4-2 Schematic diagram for GTS
Token
bucket
Packets dropped
Packet
classification
Packets to be sent
through this interface
Packets sent
Tokens are put into the
bucket at the set rate
Queue
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:
z
Forwarding the packets whose evaluation result is “conforming”.
z
Dropping the packets whose evaluation result is “excess”.
Traffic Shaping
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 Figure 4-3 . When there are enough tokens in the token
bucket, these cached packets are sent at an even rate. Traffic shaping may result in an additional delay
while traffic policing does not.