Manual Chapter : Rate Shaping with srTCM Policers

Applies To:

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BIG-IP DNS

  • 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP PEM

  • 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP AFM

  • 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP Analytics

  • 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP ASM

  • 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP AAM

  • 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP Link Controller

  • 15.1.0

BIG-IP APM

  • 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP LTM

  • 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0
Manual Chapter

Rate Shaping with srTCM Policers

About Single Rate Three Color Marker Policers

A
Single Rate Three Color Marker (srTCM) policer
meters an IP packet stream and classifies the packets as either green, yellow, or red. An srTCM policer is useful, for example, for ingress policing of a service, where only the length, not the peak rate, of the burst determines service eligibility.
The srTCM color classification is based on specific values that you define:
Committed Information Rate (CIR)
This is the rate, in bytes per second, that you want the BIG-IP® system to commit to the guest. For packets that are part of a flow consuming less than or equal to the CIR value, the system classifies the packets as
green
.
Committed Burst Size (CBS)
This is a burst size, in bytes, that you want the system to commit to the guest beyond the CIR value. For packets that are part of a burst into the allocated CBS value, the system classifies the packets as
yellow
.
Excess Burst Size (EBS)
This is a data burst size, in bytes, that exceeds the CIR and CBS values and that you want the system to classify as excessive. For packets that are part of a burst into the specified EBS value, the system classifies the packets as
red
and might drop them.
In general, when you configure an srTCM policer, the BIG-IP system classifies a packet as
green
if the packet size does not exceed the CBS,
yellow
if the packet size exceeds the CBS but not the EBS, and
red
otherwise.
SrTCM policers that you create run in color-blind mode only. In
color-blind
mode, the policer ignores any color classifications that might have been previously set on IP packets coming into the BIG-IP system.

Creating a Single Rate Three Color Marker policer

You can create a Single Rate Three Color Marker (srTCM) policer when you want the BIG-IP system to meter an IP packet stream and classify the packets as either green, yellow, or red. An srTCM policer is useful, for example, for ingress policing of a service, where only the length of the burst, and not the peak rate of the burst, determines service eligibility.
  1. On the Main tab, click
    Network
    Rate Shaping
    Single Rate TCM Policer
    .
    The screen displays a list of Single Rate Three Color Marker (srTCM) policers.
  2. In the
    Committed Information Rate
    field, type a rate, in bytes per second, that you want the system to commit to the guest.
    An example of a CIR value is
    50000000
    .
    For packets that are part of a flow consuming less than or equal to the
    Committed Information Rate
    value, the system classifies the packets as
    green
    .
  3. In the
    Committed Burst Size
    field, type a burst size, in bytes, that you want the system to commit to the guest beyond the
    Committed Information Rate
    value.
    An example of a CBS value is
    1000000
    .
    For packets that are part of a burst into the allocated
    Committed Burst Size
    value, the system classifies the packets as
    yellow
    .
  4. In the
    Excess Burst Size
    field, type a data burst size, in bytes, that exceeds the
    Committed Information Rate
    and
    Committed Burst Size
    values and that you want the system to classify as excessive.
    An example of an EBS value is
    2000000
    .
    For packets that are part of a burst into the specified
    Excess Burst Size
    value, the system classifies the packets as
    Red
    and might drop them.
  5. From the
    Action
    list, select the action that you want the system to perform when the system classifies packets as red:
    • Select
      None
      when you want the system to take no action, regardless of color classification.
    • Select
      Drop
      when you want the system to drop packets classifed as red.
  6. Click
    Finished
    .
After you perform this task, the BIG-IP system includes an srTCM policer, in color-blind mode, that you can apply to network traffic.