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• Forwarding the packet with its precedence re-marked if the evaluation result is "conforming."
Priorities that can be re-marked include 802.1p priority, DSCP precedence, and local precedence.
GTS
GTS supports shaping the outbound traffic. GTS limits the outbound traffic rate by buffering exceeding
traffic. You can use GTS to adapt the traffic output rate on a device to the input traffic rate of its connected
device to avoid packet loss.
The differences between traffic policing and GTS are as follows:
• Packets to be dropped with traffic policing are retained in a buffer or queue with GTS, as shown
in Figure 9. W
hen enough tokens are in the token bucket, the buffered packets are sent at an even
rate.
• GTS can result in additional delay and traffic policing does not.
Figure 9 GTS
For example, in Figure 10, Device B performs traffic policing on packets from Device A and drops packets
exceeding the limit. To avoid packet loss, you can perform GTS on the outgoing interface of Device A so
that packets exceeding the limit are cached in Device A. Once resources are released, GTS takes out the
cached packets and sends them out.
Figure 10 GTS application
Line rate
Line rate supports rate-limiting the inbound traffic or the outbound traffic. The outbound traffic is taken for
example.
Device A
Device B
Physical link
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