Traffic Policing - HP 6125G Configuration Manual

Peak information rate (PIR)—Rate at which tokens are put into bucket E, which specifies the average
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packet transmission or forwarding rate allowed by bucket E.
Excess burst size (EBS)—Size of bucket E, which specifies the transient burst of traffic that bucket E
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can forward.
CBS is implemented with bucket C, and EBS with bucket E. In each evaluation, packets are measured
against the following bucket scenarios:
• If bucket C has enough tokens, packets are colored green.
If bucket C does not have enough tokens but bucket E has enough tokens, packets are colored
•
yellow.
If neither bucket C nor bucket E has sufficient tokens, packets are colored red.
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Traffic policing

IMPORTANT:
Traffic policing supports policing the inbound traffic and the outbound traffic.
A typical application of traffic policing is to supervise the specification of certain traffic entering a
network and limit it within a reasonable range, or to "discipline" the extra traffic to prevent aggressive
use of network resources by a certain application. For example, you can limit bandwidth for HTTP
packets to less than 50% of the total. If the traffic of a certain session exceeds the limit, traffic policing can
drop the packets or reset the IP precedence of the packets.
outbound traffic on an interface.
Figure 9 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 take pre-defined policing actions on each packet depending on the
evaluation result:
Forwarding the packet if the evaluation result is "conforming"
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Dropping the packet if the evaluation result is "excess"
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• Forwarding the packet with its precedence, which can be 802.1p priority, DSCP, and local
precedence, re-marked if the evaluation result is "conforming"
Figure 9
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shows an example of policing