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{ CIR—Rate at which tokens are put into bucket C. It sets the average packet transmission or
forwarding rate allowed by bucket C.
{ CBS—Size of bucket C, which specifies the transient burst of traffic that bucket C can
forward.
{ EBS—Size of bucket E minus size of bucket C. The EBS specifies the transient burst of
traffic that bucket E can forward. The EBS cannot be 0. The size of E bucket is the sum of
the CBS and EBS.
When a packet arrives, the following rules apply:
{ If bucket C has enough tokens, the packet is colored green.
{ If bucket C does not have enough tokens but bucket E has enough tokens, the packet is
colored yellow.
{ If neither bucket C nor bucket E has enough tokens, the packet is colored red.
• Two rate three color—Uses two token buckets and the following parameters:
{ CIR—Rate at which tokens are put into bucket C. It sets the average packet transmission or
forwarding rate allowed by bucket C.
{ CBS—Size of bucket C, which specifies the transient burst of traffic that bucket C can
forward.
{ PIR—Rate at which tokens are put into bucket E, which specifies the average packet
transmission or forwarding rate allowed by bucket E.
{ EBS—Size of bucket E, which specifies the transient burst of traffic that bucket E can
forward.
When a packet arrives, the following rules apply:
{ If bucket C has enough tokens, the packet is colored green.
{ If bucket C does not have enough tokens but bucket E has enough tokens, the packet is
colored yellow.
{ If neither bucket C nor bucket E has enough tokens, the packet is colored red.
Traffic policing
Traffic policing supports policing the inbound traffic and the outbound traffic.
A typical application of traffic policing is to supervise the specification of traffic entering a network and
limit it within a reasonable range. Another application is to "discipline" the extra traffic to prevent
aggressive use of network resources by an application. For example, you can limit bandwidth for
HTTP packets to less than 50% of the total. If the traffic of a session exceeds the limit, traffic policing
can drop the packets or reset the IP precedence of the packets. Figure 8 sh
ows an example of
policing outbound traffic on an interface.
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