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Implementing Cisco Networking Solutions by Harpreet Singh

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Policing

This feature allows you to limit the input or output transmission rate of a class of traffic based on user-defined criteria. It also enables the system to mark packets according to a user-defined criterion, such as the IP precedence value, the QoS group, or the DSCP value. Such traffic can then be dropped or transmitted, as desired.

A policer typically drops traffic that is out of profile. For example, the rate-limiting policer either drops the packet or rewrites its IP precedence, resetting the type of service bits in the packet header. Policers can have two or three colors.

A two-color policer lets you identify two types of traffic:

  • Conforming traffic (CIR-Committed Information Rate)
  • Exceeding traffic (above CIR)

The traffic ...

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