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.
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.
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.
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:
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
"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.
Cisco 1700 series
Cisco 2600 series
Cisco 7100 series
Cisco 7200 series
Cisco 7500 series (VIP-based platform only)
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
No new or modified standards are supported by this feature.
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:
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
Displays statistics and configurations of all input and output policies attached to an interface.
Check the interface type. Verify that your interface is not listed as a nonsupported interface in the
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
Displays all configured policy maps.
Displays the user-specified policy map.
Displays statistics and configurations of all input and output policies that are attached to an interface.
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.
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 showpolicy-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
police cir 1000000 bc 31250 pir 2000000 be 31250
exceed-action set-prec-transmit 4
violate-action set-prec-transmit 2