Regulation Of Traffic With The Policing Mechanism; Single-Rate Policer - Cisco ASR 9000 Series Configuration Manual

Configuring Modular QoS Congestion Management

Regulation of Traffic with the Policing Mechanism

is sent and traffic that exceeds is sent with a decreased priority or is dropped. Users can change these
configuration options to suit their network needs. Traffic policing also provides a certain amount of bandwidth
management by allowing you to set the burst size (Bc) for the committed information rate (CIR). When the
peak information rate (PIR) is supported, a second token bucket is enforced and then the traffic policer is
called a two-rate policer.
Regulation of Traffic with the Policing Mechanism
This section describes the single-rate and two-rate policing mechanisms.

Single-Rate Policer

A single-rate, two-action policer provides one token bucket with two actions for each packet: a conform action
and an exceed action.
This figure illustrates how a single-rate token bucket policer marks packets as either conforming or exceeding
a CIR, and assigns an action.
Figure 4: Marking Packets and Assigning Actions — Single-Rate Policer
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