HP 6125G HP 6125G & 6125G/XG Blade Switches ACL and QoS Configuration - Page 39

Traffic policing

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• Peak information rate (PIR)-Rate at which tokens are put into bucket E, which specifies the average 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 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. 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. Figure 9 shows an example of policing 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" • Dropping the packet if the evaluation result is "excess" • Forwarding the packet with its precedence, which can be 802.1p priority, DSCP, and local precedence, re-marked if the evaluation result is "conforming" 33

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33
•
Peak information rate (PIR)
—Rate at which tokens are put into bucket E, which specifies the average
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
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.
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.
Figure 9
shows an example of policing
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"
•
Dropping the packet if the evaluation result is "excess"
•
Forwarding the packet with its precedence, which can be 802.1p priority, DSCP, and local
precedence, re-marked if the evaluation result is "conforming"