Applies To:
Show Versions
BIG-IP AAM
- 14.0.1, 14.0.0
BIG-IP APM
- 14.0.1, 14.0.0
BIG-IP Analytics
- 14.0.1, 14.0.0
BIG-IP Link Controller
- 14.0.1, 14.0.0
BIG-IP LTM
- 14.0.1, 14.0.0
BIG-IP PEM
- 14.0.1, 14.0.0
BIG-IP AFM
- 14.0.1, 14.0.0
BIG-IP DNS
- 14.0.1, 14.0.0
BIG-IP ASM
- 14.0.1, 14.0.0
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.
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.
