- Policing and Shaping Overview
- IPv6 QoS: MQC Traffic Policing
- Configuring Traffic Policing
- IPv6 QoS: MQC Traffic Shaping
- Two-Rate Policer
- Policer Enhancement - Multiple Actions
- Percentage-Based Policing and Shaping
- Modular QoS CLI Three-Level Hierarchical Policer
- ATM Policing by Service Category for SVC and SoftPVC
- Modular QoS CLI Unconditional Packet Discard
- Control Plane Policing
- Control Plane Protection
- Control Plane Logging
- Management Plane Protection
- Class-Based Policing
- QoS Percentage-Based Policing
- Overhead Accounting
- Adaptive QoS over DMVPN
Contents
- Policer Enhancement - Multiple Actions
- Finding Feature Information
- Feature Overview
- Benefits
- Restrictions
- Related Features and Technologies
- Related Documents
- Supported Platforms
- Supported Standards MIBs and RFCs
- Prerequisites
- Configuration Tasks
- Configuring Multiple Policer Actions
- Verifying the Multiple Policer Actions Configuration
- Troubleshooting Tips
- Monitoring and Maintaining the Multiple Policer Actions
- Configuration Examples
- Example Multiple Actions in a Two-Rate Policer
- Example Verifying the Multiple Policer Actions
Policer Enhancement - Multiple Actions
Feature History
|
Release |
Modification |
|---|---|
|
12.2(8)T |
This feature was introduced. |
This document describes the Policer Enhancement -- Multiple Actions feature in Cisco IOS Release 12.2(8)T. It includes the following sections:
- Finding Feature Information
- Feature Overview
- Supported Platforms
- Supported Standards MIBs and RFCs
- Prerequisites
- Configuration Tasks
- Monitoring and Maintaining the Multiple Policer Actions
- Configuration Examples
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Overview
This feature further extends the functionality of the Cisco IOS Traffic Policing feature (a single-rate policer) and the Two-Rate Policer feature. The Traffic Policing and Two-Rate Policer features are traffic policing mechanisms that allow you to control the maximum rate of traffic sent or received on an interface. Both of these traffic policing mechanisms mark packets as either conforming to, exceeding, or violating a specified rate. After a packet is marked, you can specify an action to be taken on the packet based on that marking.
With both the Traffic Policing feature and the Two-Rate Policer feature, you can specify only one conform action, one exceed action, and one violate action. Now with the new Policer Enhancement -- Multiple Actions feature, you can specify multiple conform, exceed, and violate actions for the marked packets.
Benefits
Before this feature, you could specify only one marking action for a packet, in addition to transmitting the packet. This feature provides enhanced flexibility by allowing you to specify multiple marking actions for a packet, as required. For example, if you know the packet will be transmitted through both a TCP/IP and a Frame Relay environment, you can change the DSCP value of the exceeding or violating packet, and also set the Frame Relay Discard Eligibility (DE) bit from 0 to 1 to indicate lower priority.
Restrictions
On a Cisco 7500 series router, traffic policing can monitor Cisco Express Forwarding (CEF) or distributed CEF (dCEF) switching paths only. To use the Two-Rate Policer, CEF or dCEF must be configured on both the interface receiving the packet and the interface sending the packet.
On a Cisco 7500 series router, traffic policing cannot be applied to packets that originated from or are destined to a router.
Multiple policer actions can be configured on an interface, a subinterface, a Frame Relay data-link connection identifier (DLCI), and an ATM permanent virtual circuit (PVC) only.
When using this feature, you can specify a maximum of four actions at one time.
Multiple policer actions are not supported on the following interfaces: - Fast EtherChannel
- PRI
- Any interface on a Cisco 7500 series router that does not support CEF or dCEF
Related Features and Technologies
Modular Quality of Service (QoS) Command-Line Interface (CLI) (MQC)
Class-Based Weighted Fair Queueing (CBWFQ)
Class-Based Packet Marking
Traffic Policing
Two-Rate Policing
Related Documents
"Applying QoS Features Using the MQC" module
"Configuring Weighted Fair Queueing" module
Marking Network Traffic" module
"Policing and Shaping Overview" module
"Traffic Policing" module
"Two-Rate Policer" module
Cisco IOS Quality of Service Solutions Command Reference.
RFC 2697, A Single Rate Three Color Marker
RFC 2698, A Two Rate Three Color Marker
Supported Platforms
Cisco 1700 series
Cisco 2600 series
Cisco 3620
Cisco 3640
Cisco 3660
Cisco 7100 series
Cisco 7200 series
Cisco 7500 series (VIP-based platform only)
Cisco MC3810
 Note | To use the set-clp-transmitaction available with this feature, the Enhanced ATM Port Adapter (PA-A3) is required. Therefore, the set-clp-transmit action is not supported on any platform that does not support the PA-A3 adapter (such as the Cisco 2600 series router and the Cisco 3640 router). For more information, refer to the documentation for your specific router. |
Supported Standards MIBs and RFCs
Standards
No new or modified standards are supported by this feature.
MIBs
CISCO-CLASS-BASED-QOS-MIB
CISCO-CLASS-BASED-QOS-CAPABILITY-MIB
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
RFCs
RFC 2697, A Single Rate Three Color Marker
RFC 2698, A Two Rate Three Color Marker
Prerequisites
On a Cisco 7500 series router, CEF or dCEF must be configured on the interface before you can use the Policer Enhancement -- Multiple Actions feature.
To configure the Policer Enhancement -- Multiple Actions feature, a traffic class and a service policy must be created, and the service policy must be attached to a specified interface.
Configuration Tasks
- Configuring Multiple Policer Actions
- Verifying the Multiple Policer Actions Configuration
- Troubleshooting Tips
Configuring Multiple Policer Actions
1. Router(config)# policy-map policy-map-name
2. Router(config-pmap)# class class-default
3. Router(config-pmap-c)# police {cir cir}[bc conform-burst]{pir pir} [be peak-burst] [conform-action action [exceed-action action [violate-action action]]]
DETAILED STEPS
| Command or Action | Purpose | |
|---|---|---|
| Step 1 | Router(config)# policy-map policy-map-name |
Creates a policy map. Enters policy-map configuration mode. |
| Step 2 | Router(config-pmap)# class class-default |
Specifies the default traffic class for a service policy. Enters policy-map class configuration mode. |
| Step 3 | Router(config-pmap-c)# police {cir cir}[bc conform-burst]{pir pir} [be peak-burst] [conform-action action [exceed-action action [violate-action action]]] |
Configures traffic policing and specifies multiple actions applied to packets marked as conforming to, exceeding, or violating a specific rate. Use one line per action that you want to specify. Enters policy-map class police configuration mode. |
Verifying the Multiple Policer Actions Configuration
|
Command |
Purpose |
|---|---|
Router#
show policy-map interface
|
Displays statistics and configurations of all input and output policies attached to an interface. |
Troubleshooting Tips
Check the interface type. Verify that your interface is not listed as a nonsupported interface in the "Restrictions" section of this document.
For input traffic policing on a Cisco 7500 series router, verify that CEF or dCEF is configured on the interface on which traffic policing is configured.
For output traffic policing on a Cisco 7500 series router, ensure that the incoming traffic is CEF-switched or dCEF-switched. Traffic policing cannot be used on the switching path unless CEF or dCEF switching is enabled.
Monitoring and Maintaining the Multiple Policer Actions
|
Command |
Purpose |
|---|---|
Router# show policy-map
|
Displays all configured policy maps. |
Router# show policy-map policy-map-name |
Displays the user-specified policy map. |
Router# show policy-map interface
|
Displays statistics and configurations of all input and output policies that are attached to an interface. |
Configuration Examples
Example Multiple Actions in a Two-Rate Policer
In the following example, a policy map called police is configured to use a two-rate policer to police traffic leaving an interface. Two rates, a committed information rate (CIR) of 1 Mbps and a peak information rate (PIR) of 2 Mbps, have been specified.
Router(config)# policy-map police Router(config-pmap)# class class-default Router(config-pmap-c)# police cir 1000000 pir 2000000 Router(config-pmap-c-police)# conform-action transmit Router(config-pmap-c-police)# exceed-action set-prec-transmit 4 Router(config-pmap-c-police)# exceed-action set-frde Router(config-pmap-c-police)# violate-action set-prec-transmit 2 Router(config-pmap-c-police)# violate-action set-frde-transmit Router(config-pmap-c-police)# end
The following actions will be performed on packets associated with the policy map called police:
All packets marked as conforming to these rates (that is, packets conforming to the CIR) will be transmitted unaltered.
All packets marked as exceeding these rates (that is, packets exceeding the CIR but not exceeding the PIR) will be assigned an IP Precedence level of 4, the DE bit will be set to 1, and then transmitted.
All packets marked as violating the rate (that is, exceeding the PIR) will be assigned an IP Precedence level of 2, the DE bit will be set to 1, and then transmitted.
Example Verifying the Multiple Policer Actions
The following sample output of the show policy-mapcommand displays the configuration for a service policy called police. In this service policy, multiple actions for packets marked as exceeding the specified CIR rate have been configured. For those packets, the IP Precedence level is set to 4, the DE bit is set to 1, and the packet is transmitted. Multiple actions for packets marked as violating the specified PIR rate have also been configured. For those packets, the IP Precedence level is set to 2, the DE bit is set to 1, and the packet is transmitted.
Router# show policy-map police
Policy Map police
Class class-default
police cir 1000000 bc 31250 pir 2000000 be 31250
conform-action transmit
exceed-action set-prec-transmit 4
exceed-action set-frde-transmit
violate-action set-prec-transmit 2
violate-action set-frde-transmit