- Policing and Shaping Overview
- IPv6 QoS: MQC Traffic Shaping
- Distribution of Remaining Bandwidth Using Ratio
- QoS Percentage-Based Shaping
- Ethernet Overhead Accounting
- MQC Traffic Shaping Overhead Accounting for ATM
- QoS Policy Accounting
- PPP Session Queueing on ATM VCs
- VP/VC Shaping for PPPoEoA/PPPoA
- Hierarchical Color-Aware Policing
- IPv6 QoS: MQC Traffic Policing
- Traffic Policing
- Policer Enhancement Multiple Actions
- Control Plane Policing
- Management Plane Protection
- Class-Based Policing
- QoS Percentage-Based Policing
- Two-Rate Policer
- Punt Policing and Monitoring
- Port-Shaper and LLQ in the Presence of EFPs
- Adaptive QoS over DMVPN
Punt Policing and
Monitoring
Punt policing protects the Route Processor (RP) from having to process noncritical traffic, which increases the CPU bandwidth available to critical traffic. Traffic is placed into different CPU queues based on various criteria. The Punt Policing and Monitoring feature allows you to police the punt rate on a per-queue basis.
- Finding Feature Information
- Information About Punt Policing and Monitoring
- How to Configure Punt Policing and Monitoring
- How to Configure Punt Policing and Monitoring
- Configuration Examples for Punt Policing and Monitoring
- Additional References
- Feature Information for Punt Policing and Monitoring
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.
Information About Punt Policing and Monitoring
Overview of Punt Policing and Monitoring
Packets received on an interface are punted to the Router Processor (RP) for various reasons. Some examples of these various reasons include, unicast and multicast control plane traffic that are destined for a routing protocol process running on the RP, and IP packets that generate Internet Control Message Protocol (ICMP) exceptions such as a Time to live (TTL) expiration. The RP has a limited capacity to process the punted packets, and while some of them are critical for the router operation and should not be dropped, some can be dropped without impacting the router operation.
Punt policing frees the RP from having to process noncritical traffic. Traffic is placed in queues based on various criteria, and you can configure the maximum punt rate for each queue which allows you to configure the system so that packets are less likely to be dropped from queues that contain critical traffic.
 Note | Traffic on certain CPU queues could still be dropped, regardless of the configured punt rate, based on other criteria such as the queue priority, queue size, and traffic punt rate. |
How to Configure Punt Policing and Monitoring
Configuring Punt Policing
Note | Traffic on a specific CPU queue may be dropped irrespective of the configured maximum punt rate, based on the queue priority, queue size, and the configured traffic punt rate. |
1.
enable
2.
configure
terminal
3.
platform
qos-policer queue
queue-id
cir
4.
end
DETAILED STEPS
Configuring Punt Policing on an Interface
Note | At an interface level, punt control can be enabled or disabled by the no punt-control enable command. You can configure the rate, however, by default, it uses the global configuration if the rate is not configured. |
1.
enable
2.
configure
terminal
3.
platform punt-interface
raterate
4.
punt-control enable
rate
5.
end
DETAILED STEPS
How to Configure Punt Policing and Monitoring
Verifying Punt Policing
Verifying Queue-Based Punt Policing
Use the show platform software infrastructure punt statistics to display punt police statistics:
Router# show platform software infrastructure punt statistics UEA Punt Statistics Global drops : 0 Queue Name | Rx count | Drop count ------------------------+---------------------------+----------------------- SW FORWARDING Q | 0 | 0 ROUTING PROTOCOL Q | 0 | 0 ICMP Q | 0 | 0 HOST Q | 57115 | 0 ACL LOGGING Q | 0 | 0 STP Q | 0 | 0 L2 PROTOCOL Q | 6571 | 0 MCAST CONTROL Q | 208839 | 0 BROADCAST Q | 4 | 0 REP Q | 0 | 0 CFM Q | 0 | 0 CONTROL Q | 0 | 0 IP MPLS TTL Q | 0 | 0 DEFAULT MCAST Q | 0 | 0 MCAST ROUTE DATA Q | 0 | 0 MCAST MISMATCH Q | 0 | 0 RPF FAIL Q | 0 | 0 ROUTING THROTTLE Q | 87 | 0 MCAST Q | 0 | 0 MPLS OAM Q | 0 | 0 IP MPLS MTU Q | 0 | 0 PTP Q | 0 | 0 LINUX ND Q | 0 | 0 KEEPALIVE Q | 0 | 0 ESMC Q | 0 | 0 FPGA BFD Q | 0 | 0 FPGA CCM Q | 0 | 0 FPGA CFE Q | 0 | 0 L2PT DUP Q | 0 | 0
Verifying Punt Policing Statistics
Use the show platform hardware pp active infrastructure pi npd rx policer command to display the punt policing statistics for all queues.
Ring | Queue Name | Punt rate | Burst rate -----+---------------------+---------------------+-------------------- 0 | SW FORWARDING Q | 500 | 1000 1 | ROUTING PROTOCOL Q | 500 | 1000 2 | ICMP Q | 500 | 1000 3 | HOST Q | 1000 | 2000 4 | ACL LOGGING Q | 500 | 1000 5 | STP Q | 3000 | 6000 6 | L2 PROTOCOL Q | 1000 | 2000 7 | MCAST CONTROL Q | 1000 | 2000 8 | BROADCAST Q | 1000 | 2000 9 | REP Q | 3000 | 6000 10 | BGP LDP Q | 3000 | 6000 11 | CONTROL Q | 1000 | 2000 12 | IP MPLS TTL Q | 1000 | 2000 13 | DEFAULT MCAST Q | 500 | 1000 14 | MCAST ROUTE DATA Q | 500 | 1000 15 | MCAST HIGH PRI Q | 1000 | 2000 16 | RPF FAIL Q | 500 | 1000 17 | ROUTING THROTTLE Q | 500 | 1000 18 | MCAST Q | 500 | 1000 19 | MPLS OAM Q | 1000 | 2000 20 | IP MPLS MTU Q | 500 | 1000 21 | PTP Q | 3000 | 6000 22 | LINUX ND Q | 500 | 1000 23 | KEEPALIVE Q | 1000 | 2000 24 | ESMC Q | 3000 | 6000 25 | FPGA BFD Q | 4000 | 8000 26 | FPGA CCM Q | 4000 | 8000 27 | FPGA CFE Q | 1000 | 2000 28 | L2PT DUP Q | 4000 | 8000 29 | TDM CTRL Q | 3000 | 6000 30 | ICMP UNREACHABLE Q | 500 | 1000 31 | SSFPD Q | 6000 | 12000
Use the show platform hardware pp active feature qos policer cpu stats 1 command to clear the statistics of all the CPU queues.
Use the show platform hardware pp active feature qos policer cpu stats 0 command to clear the statistics of a particular CPU queue.
########## Stats for CPU queue 0 ########## Internal Qnum: 1 Queue Name: SW FORWARDING Q Policer conform: 0 (packets) 0 (bytes) Policer exceed: 0 (packets) 0 (bytes) RM Drops: 0 (packets) 0 (bytes) Policer commit rate is: 1000000, Policer burst commit is 100000 ########### Stats for CPU queue 1 ########## Internal Qnum: 2 Queue Name: ROUTING PROTOCOL Q Policer conform: 0 (packets) 0 (bytes) Policer exceed: 0 (packets) 0 (bytes) RM Drops: 0 (packets) 0 (bytes) Policer commit rate is: 1000000, Policer burst commit is 100000 ——————— ——————— ——————— ########### Stats for CPU queue 30 ########## Internal Qnum: 31 Queue Name: ICMP UNREACHABLE Q Policer conform: 0 (packets) 0 (bytes) Policer exceed: 0 (packets) 0 (bytes) RM Drops: 0 (packets) 0 (bytes) Policer commit rate is: 1000000, Policer burst commit is 100000 ########### Stats for CPU queue 31 ########## Internal Qnum: 32 Queue Name: SSFPD Q Policer conform: 0 (packets) 0 (bytes) Policer exceed: 0 (packets) 0 (bytes) RM Drops: 0 (packets) 0 (bytes) Policer commit rate is: 1000000, Policer burst commit is 100000
Use show platform hardware pp active feature qos policer cpu 3 0 to display the queue specific statistics.
########### Stats for CPU queue 3 ########## Internal Qnum: 4 Queue Name: HOST Q Policer conform: 0 (packets) 0 (bytes) Policer exceed: 0 (packets) 0 (bytes) RM Drops: 0 (packets) 0 (bytes) Policer commit rate is: 12000000, Policer burst commit is 3000000 3 —— queueId of CPU and 0 — show stats
Use the show platform hardware qfp active statistics drop to display the output after adding the drop cause:
Device# show platform hardware qfp active statistics drop --------------------------------------------------------------------- Global Drop Stats Packets Octets --------------------------------------------------------------------- PuntPerIntfPolicerDrops 257 274166
Note | When a packet is dropped by per interface punt policer, a log including the source interface is displayed as follows (the log shows one log in 30 seconds): |
*Jun 6 08:25:35.893: %IOSXE-5-PLATFORM: F0: cpp_cp: QFP:0.0 Thread:046 TS:00000000400859588264 %PUNT_INJECT-5-DROP_PUNT_INTF: punt interface policer drop packet from GigabitEthernet2/3/1.726
Configuration Examples for Punt Policing and Monitoring
Example: Configuring Punt Policing
The following example shows how to enable punt-policing:
Router# enable Router# configure terminal Router(config)# platform qos-policer queue 3 64000
Additional References
Related Documents
|
Related Topic |
Document Title |
|---|---|
|
QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples |
Cisco IOS Quality of Service Solutions Command Reference |
|
Traffic marking |
“Marking Network Traffic” module |
|
Traffic policing |
“Traffic Policing” module |
|
Traffic policing and shaping concepts and overview information |
“Policing and Shaping Overview” module |
|
Modular quality of service command-line interface (MQC) |
“Applying QoS Features Using the MQC” module |
Standards
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MIBs
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MIB |
MIBs Link |
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None |
To locate and download MIBs for selected platforms, Cisco IOS XE Software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFCs
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RFC |
Title |
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None |
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Technical Assistance
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Description |
Link |
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for Punt Policing and Monitoring
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
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 Name |
Releases |
Feature Information |
|---|---|---|
|
Punt Policing and Monitoring |
Cisco IOS XE Release 3.5S |
The Punt Policing and Monitoring feature allows you to specify a maximum punt rate on a per-queue basis. For Cisco IOS XE Release 3.5S, this feature was implemented on Cisco ASR 903 Router. The following command was introduced: platform punt-police queue |
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