Configuring Control Plane Policing

Restrictions for CoPP

Restrictions for control plane policing (CoPP) include the following:

  • Only ingress CoPP is supported. The system-cpp-policy policy-map is available on the control plane interface, and only in the ingress direction. 


  • Only the system-cpp-policy policy-map can be installed on the control plane interface.

  • The system-cpp-policy policy-map and the 17 system-defined classes cannot be modified or deleted.

  • Only the police action is allowed under the system-cpp-policy policy-map. The police rate for system-defined classes must be configured only in packets per second (pps); for user-defined class maps this must be configured only in bits per second (bps).

  • We recommend not disabling the policer for a system-defined class map, that is, do not configure the no police rate rate pps command. Doing so affects the overall system health in case of high traffic towards the CPU. Further, even if you disable the policer rate for a system-defined class map, the system automatically reverts to the default policer rate after system bootup in order to protect the system bring-up process.

  • One or more CPU queues are part of each class-map. Where multiple CPU queues belong to one class-map, changing the policer rate of a class-map affects all CPU queues that belong to that class-map. Similarly, disabling the policer in a class-map disables all queues that belong to that class-map. See Table 1 for information about which CPU queues belong to each class-map.

  • The show run command does not display information about classes configured under system-cpp policy, when they are left at default values. Use the show policy-map system-cpp-policy or the show policy-map control-plane commands instead.

    You can continue use the show run command to display information about custom policies.

Information About CoPP

This chapter describes how control plane policing (CoPP) works on your device and how to configure it.

CoPP Overview

The CoPP feature improves security on your device protecting the CPU from unnecessary traffic and DoS attacks. It can also protect control and management traffic from traffic drops caused by high volumes of other, lower priority traffic.

Your device is typically segmented into three planes of operation, each with its own objective:

  • The data plane, to forward data packets.

  • The control plane, to route data correctly.

  • The management plane, to manage network elements.

You can use CoPP to protect most of the CPU-bound traffic and ensure routing stability, reachability, and packet delivery. Most importantly, you can use CoPP to protect the CPU from a DoS attack.

CoPP uses the modular QoS command-line interface (MQC) and CPU queues to achieve these objectives. Different types of control plane traffic are grouped together based on certain criteria, and assigned to a CPU queue. You can manage these CPU queues by configuring dedicated policers in hardware. For example, you can modify the policer rate for certain CPU queues (traffic-type), or you can disable the policer for a certain type of traffic.

Although the policers are configured in hardware, CoPP does not affect CPU performance or the performance of the data plane. But since it limits the number of packets going to CPU, the CPU load is controlled. This means that services waiting for packets from hardware may see a more controlled rate of incoming packets (the rate being user-configurable).

System-Defined Aspects of CoPP

When you power-up the device for the first time, the system automatically performs the following tasks:

  • Looks for policy-map system-cpp-policy . If not found, the system creates and installs it on the control-plane.

  • Creates seventeen class-maps under system-cpp-policy .

    The next time you power-up the device, the system detects the policy and class maps that have already been created.

  • Enables all CPU queues by default, with their respective default rate. The default rates are indicated in the table System-Defined Values for CoPP.

The following table lists the class-maps that the system creates when you load the device. It lists the policer that corresponds to each class-map and one or more CPU queues that are grouped under each class-map. There is a one-to-one mapping of a class-map to a policer; and one-to-many mapping of a class-map to CPU queues.

Table 1. System-Defined Values for CoPP

Class Maps Names

Policer Index (Policer No.)

CPU queues (Queue No.)

Default Policer Rate (pps)
system-cpp- police-data

WK_CPP_POLICE_DATA(0)

WK_CPU_Q_ICMP_GEN(3)

WK_CPU_Q_BROADCAST(12)

WK_CPU_Q_ICMP_REDIRECT (6)

600

600

600
system-cpp-police-l2- control

WK_CPP_POLICE_L2_ CONTROL(1)

WK_CPU_Q_L2_CONTROL(1)

2000
system-cpp-police-routing-control

WK_CPP_POLICE_ROUTING_CONTROL(2)

WK_CPU_Q_ROUTING_CONTROL(4)

WK_CPU_Q_LOW_LATENCY (27)

5400

5400
system-cpp-police-control-low-priority

WK_CPP_POLICE_CO NTROL_LOW_PRI(3)

WK_CPU_Q_GENERAL_PUNT(25)

200

system-cpp-police-punt-webauth

WK_CPP_POLICE_PU NT_WEBAUTH(7)

WK_CPU_Q_PUNT_WEBAUTH(22)

1000

system-cpp-police- topology-control

WK_CPP_POLICE_TOPOLOGY_CONTROL(8)

WK_CPU_Q_TOPOLOGY_CONTROL(15)

13000

system-cpp-police- multicast

WK_CPP_POLICE_MULTICAST(9)

WK_CPU_Q_TRANSIT_TRAFFIC(18)

WK_CPU_Q_MCAST_DATA(30)

500

500

system-cpp-police-sys- data

WK_CPP_POLICE_SYS _DATA (10)

WK_CPU_Q_LEARNING_CACHE_OVFL(13)

WK_CPU_Q_CRYPTO_CONTROL(23)

WK_CPU_Q_EXCEPTION(24)

WK_CPU_Q_EGR_EXCEPTION(28)

WK_CPU_Q_NFL_SAMPLED_DATA(26)

WK_CPU_Q_GOLD_PKT(31)

WK_CPU_Q_RPF_FAILED(19)

100

100

200

100

100

100

100
system-cpp-police-dot1x-auth

WK_CPP_POLICE_DOT1X(11)

WK_CPU_Q_DOT1X_AUTH(0)

1000

system-cpp-police- protocol-snooping

WK_CPP_POLICE_PR

WK_CPU_Q_PROTO_SNOOPING(16)

2000

system-cpp-police-sw-forward

WK_CPP_POLICE_SW_FWD (13)

WK_CPU_Q_SW_FORWARDING_Q(14)

WK_CPU_Q_LOGGING(21)

WK_CPU_Q_L2_LVX_DATA_PACK (11)

1000

1000

1000

system-cpp-police-forus

WK_CPP_POLICE_FORUS(14)

WK_CPU_Q_FORUS_ADDR_RESOLUTION(5)

WK_CPU_Q_FORUS_TRAFFIC(2)

1000

1000

system-cpp-police- multicast-end-station

WK_CPP_POLICE_MULTICAST_SNOOPING(15)

WK_CPU_Q_MCAST_END_STA TION_SERVICE(20)

2000

system-cpp-default

WK_CPP_POLICE_DEFAULT_POLICER

WK_CPU_Q_DHCP_SNOOPING(17)

WK_CPU_Q_UNUSED (7)

WK_CPU_Q_EWLC_CONTROL(9)

WK_CPU_Q_EWLC_DATA(10)

1000

1000

1000

1000

system-cpp-police-stackwise-virt-control

WK_CPP_STACKWISE_VIRTUAL_CONTROL

WK_CPU_Q_STACKWISE_VIRTUAL_CONTROL (29)

8000

system-cpp-police-l2lvx-control

WK_CPP_ L2_LVX_CONT_PACK

WK_CPU_Q_L2_LVX_CONT_PACK(8)

1000

The following table lists the CPU queues and the feature(s) associated with each CPU queue.

Table 2. CPU Queues and Associated Feature(s)

CPU queues (Queue No.)

Feature(s)

WK_CPU_Q_DOT1X_AUTH(0)

IEEE 802.1x Port-Based Authentication

WK_CPU_Q_L2_CONTROL(1)

Dynamic Trunking Protocol (DTP)

VLAN Trunking Protocol (VTP)

Port Aggregation Protocol (PAgP)

Client Information Signaling Protocol (CISP)

Message session relay protocol

Multiple VLAN Registration Protocol (MVRP)

Metropolitan Mobile Network (MMN)

Link Level Discovery Protocol (LLDP)

UniDirectional Link Detection (UDLD)

Link Aggregation Control Protocol (LACP)

Cisco Discovery Protocol (CDP)

Spanning Tree Protocol (STP)

WK_CPU_Q_FORUS_TRAFFIC(2)

Host such as Telnet,Pingv4 and Pingv6, and SNMP

Keepalive / loopback detection

Initiate-Internet Key Exchange (IKE) protocol (IPSec)

WK_CPU_Q_ICMP_GEN(3)

ICMP - destination unreachable

ICMP-TTL expired

WK_CPU_Q_ROUTING_CONTROL(4)

Routing Information Protocol version 1 (RIPv1)

RIPv2

Interior Gateway Routing Protocol (IGRP)

Border Gateway Protocol (BGP)

PIM-UDP

Virtual Router Redundancy Protocol (VRRP)

Hot Standby Router Protocol version 1 (HSRPv1)

HSRPv2

Gateway Load Balancing Protocol (GLBP)

Label Distribution Protocol (LDP)

Web Cache Communication Protocol (WCCP)

Routing Information Protocol next generation (RIPng)

Open Shortest Path First (OSPF)

Open Shortest Path First version 3(OSPFv3)

Enhanced Interior Gateway Routing Protocol (EIGRP)

Enhanced Interior Gateway Routing Protocol version 6 (EIGRPv6)

DHCPv6

Protocol Independent Multicast (PIM)

Protocol Independent Multicast version 6 (PIMv6)

Hot Standby Router Protocol next generation (HSRPng)

IPv6 control

Generic Routing Encapsulation (GRE) keepalive

Network Address Translation (NAT) punt

Intermediate System-to-Intermediate System (IS-IS)

WK_CPU_Q_FORUS_ADDR_RESOLUTION(5)

Address Resolution Protocol (ARP)

IPv6 neighbor advertisement and neighbor solicitation

WK_CPU_Q_ICMP_REDIRECT(6)

Internet Control Message Protocol (ICMP) redirect

WK_CPU_Q_UNUSED (7)

Unused

WK_CPU_Q_L2_LVX_CONT_PACK(8)

Exchange ID (XID) packet

WK_CPU_Q_EWLC_CONTROL(9)

Embedded Wirelss Controller (eWLC) [Control and Provisioning of Wireless Access Points (CAPWAP) (UDP 5246)]

WK_CPU_Q_EWLC_DATA(10)

eWLC data packet (CAPWAP DATA, UDP 5247)

WK_CPU_Q_L2_LVX_DATA_PACK(11)

Unknown unicast packet punted for map request.

WK_CPU_Q_BROADCAST(12)

 All types of broadcast

WK_CPU_Q_LEARNING_CACHE_OVFL(13)

 Learning cache overflow (Layer 2 + Layer 3)

WK_CPU_Q_SW_FORWARDING_Q(14)

Data - access control list (ACL) Full

Data - IPv4 options

Data - IPv6 hop-by-hop

Data - out-of-resources / catch all

Data - Reverse Path Forwarding (RPF) incomplete

Glean packet

WK_CPU_Q_TOPOLOGY_CONTROL(15)

Spanning Tree Protocol (STP)

Resilient Ethernet Protocol (REP)

Shared Spanning Tree Protocol (SSTP)

WK_CPU_Q_PROTO_SNOOPING(16)

Address Resolution Protocol (ARP) snooping for Dynamic ARP Inspection (DAI)

WK_CPU_Q_DHCP_SNOOPING(17)

DHCP snooping

WK_CPU_Q_TRANSIT_TRAFFIC(18)

This is used for packets punted by NAT, which need to be handled in the software path.

WK_CPU_Q_RPF_FAILED(19)

Data – mRPF (multicast RPF) failed

WK_CPU_Q_MCAST_END_STATION _SERVICE(20)

Internet Group Management Protocol (IGMP) / Multicast Listener Discovery (MLD) control

WK_CPU_Q_LOGGING(21)

Access control list (ACL) logging

WK_CPU_Q_PUNT_WEBAUTH(22)

Web Authentication

WK_CPU_Q_CRYPTO_CONTROL(23)

Crypto Controls

WK_CPU_Q_EXCEPTION(24)

IKE indication

IP learning violation

IP port security violation

IP Static address violation

IPv6 scope check

Remote Copy Protocol (RCP) exception

Unicast RPF fail

WK_CPU_Q_GENERAL_PUNT(25)

General punt

WK_CPU_Q_NFL_SAMPLED_DATA(26)

Netflow sampled data and Media Services Proxy (MSP)

WK_CPU_Q_LOW_LATENCY(27)

Bidirectional Forwarding Detection (BFD), Precision Time Protocol (PTP)

WK_CPU_Q_EGR_EXCEPTION(28)

Egress resolution exception

WK_CPU_Q_STACKWISE_VIRTUAL _CONTROL(29)

Front side stacking protocols, namely SVL

WK_CPU_Q_MCAST_DATA(30)

Data - (S,G) creation

Data - local joins

Data - PIM Registration

Data - SPT switchover

Data - Multicast

WK_CPU_Q_GOLD_PKT(31)

Gold

User-Configurable Aspects of CoPP

You can perform these tasks to manage control plane traffic:


Note
All system-cpp-policy configurations must be saved so they are retained after reboot.

Enable or Disable a Policer for CPU Queues

Enable a policer for a CPU queue, by configuring a policer action (in packets per second) under the corresponding class-map, within the system-cpp-policy policy-map.

Disable a policer for CPU queue, by removing the policer action under the corresponding class-map, within the system-cpp-policy policy-map.


Note

If a default policer is already present, carefully consider and control its removal; otherwise the system may see a CPU hog or other anomalies, such as control packet drops.

Change the Policer Rate

You can do this by configuring a policer rate action (in packets per second), under the corresponding class-map, within thesystem-cpp-policy policy-map.

Set Policer Rates to Default

Set the policer for CPU queues to their default values, by entering the cpp system-default command in global configuration mode.

Create User-Defined Class Maps

If a given traffic class does not have a designated class map, and you want to protect this traffic, you can create specific class maps (with filters) for such traffic packets and add these user-defined class maps to system-cpp-policy.

While system-cpp-policy is applied in the ingress direction, the forwarding engine driver (FED) changes policers on user-defined class maps to the egress. The filters and the policers in all user-defined classes must therefore be applied as egress classifications and actions, respectively. The policy map itself is unaffected by this change in the direction.

When you add a user-defined class map to system-cpp-policy, the system automatically installs it on all 32 CPU queues (in addition to the control plane ), resulting in 33 instances of the policy. You can see this by entering the show platform software fed switch{ switch_number | active | standby} qos policy target status command in privileged EXEC mode.

The police rate on these class maps is controlled by the Active Queue Management (AQM) policer. AQM provides buffering control of traffic flows prior to queuing a packet into the transmit queue of a port, ensuring that certain flows do not hog the switch packet memory. If the AQM policer feature is enabled, any user-defined police rates exceeding the AQM policer limits are disregarded.

User defined class maps have normal QoS or ACL classification filters.

Upgrading or Downgrading the Software Version

Software Version Upgrades and CoPP

When you upgrade the software version on your device, the system checks and make the necessary updates as required for CoPP (For instance, it checks for the system-cpp-policy policy map and creates it if missing). You may also have to complete certain tasks before or after the upgrade activity. This is to ensure that any configuration updates are reflected correctly and CoPP continues to work as expected. Depending on the method you use to upgrade the software, upgrade-related tasks may be optional or recommended in some scenarios, and mandatory in others.

The system actions and user actions for an upgrade, are described here. Also included, are any release-specfic caveats.

System Actions for an Upgrade

When you upgrade the software version on your device, the system performs these actions. This applies to all upgrade methods:

  • If the device did not have a system-cpp-policy policy map before upgrade, then on upgrade, the system creates a default policy map.

  • If the device had a system-cpp-policy policy map before upgrade, then on upgrade, the system does not re-generate the policy.

User Actions for an Upgrade

User actions for an upgrade – depending on upgrade method:

Upgrade Method

Condition

Action Time and Action

Purpose

Regular1

None

After upgrade (required)

Enter the cpp system-default command in global configuration mode

To get the latest, default policer rates.
1 Refers to a software upgrade method that involves a reload of the switch. Can be install or bundle mode.

Software Version Downgrades and CoPP

The system actions and user actions for a downgrade, are described here.

System Actions for a Downgrade

When you downgrade the software version on your device, the system performs these actions. This applies to all downgrade methods:

  • The system retains the system-cpp-policy policy map on the device, and installs it on the control plane.

User Actions for a Downgrade

User actions for a downgrade:

Upgrade Method

Condition

Action Time and Action

Purpose

Regular2

None

No action required

Not applicable
2 Refers to a software upgrade method that involves a reload of the switch. Can be install or bundle mode.

If you downgrade the software version and then again upgrade, the system action and user actions that apply are the same as those mentioned for upgrades.

How to Configure CoPP

Enabling a CPU Queue or Changing the Policer Rate

The procedure to enable a CPU queue and change the policer rate of a CPU queue is the same. Follow these steps:

Procedure

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

policy-map policy-map-name

Example:


Device(config)# policy-map system-cpp-policy
Device(config-pmap)#

Enters the policy map configuration mode.

Step 4

class class-name

Example:


Device(config-pmap)# class system-cpp-police-protocol-snooping
Device(config-pmap-c)#

Enters the class action configuration mode. Enter the name of the class that corresponds to the CPU queue you want to enable. See table System-Defined Values for CoPP.

Step 5

police rate rate pps

Example:


Device(config-pmap-c)# police rate 100 pps
Device(config-pmap-c-police)#

Specifies an upper limit on the number of incoming packets processed per second, for the specified traffic class.

Note 
The rate you specify is applied to all CPU queues that belong to the class-map you have specified.
Step 6

exit

Example:


Device(config-pmap-c-police)# exit
Device(config-pmap-c)# exit
Device(config-pmap)# exit 
Device(config)#

Returns to the global configuration mode.
Step 7

control-plane

Example:


Device(config)# control-plane
Device(config-cp)#

Enters the control plane (config-cp) configuration mode
Step 8

service-policy input policy-name

Example:


Device(config)# control-plane
Device(config-cp)#service-policy input system-cpp-policy
Device(config-cp)#

Installs system-cpp-policy in FED. This command is required for you to see the FED policy. Not configuring this command will lead to an error.

Step 9

end

Example:


Device(config-cp)# end

Returns to the privileged EXEC mode.

Step 10

show policy-map control-plane

Example:

Device# show policy-map control-plane

Displays all the classes configured under system-cpp policy, the rates configured for the various traffic types, and statistics

Disabling a CPU Queue

Follow these steps to disable a CPU queue:

Procedure

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

policy-map policy-map-name

Example:


Device(config)# policy-map system-cpp-policy
Device(config-pmap)#

Enters the policy map configuration mode.

Step 4

class class-name

Example:


Device(config-pmap)# class system-cpp-police-protocol-snooping
Device(config-pmap-c)#

Enters the class action configuration mode. Enter the name of the class that corresponds to the CPU queue you want to disable. See the table, System-Defined Values for CoPP.

Step 5

no police rate rate pps

Example:


Device(config-pmap-c)# no police rate 100 pps

Disables incoming packet processing for the specified traffic class.

Note 
This disables all CPU queues that belong to the class-map you have specified.
Step 6

end

Example:


Device(config-pmap-c)# end

Returns to the privileged EXEC mode.

Step 7

show policy-map control-plane

Example:


Device# show policy-map control-plane

Displays all the classes configured under system-cpp policy and the rates configured for the various traffic types and statistics.

Setting the Default Policer Rates for All CPU Queues

Follow these steps to set the policer rates for all CPU queues to their default rates:

Procedure

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

cpp system-default

Example:


Device(config)# cpp system-default
Defaulting CPP : Policer rate for all classes will be set to their defaults

Sets the policer rates for all the classes to the default rate.

Step 4

end

Example:


Device(config)# end

Returns to the privileged EXEC mode.

Step 5

show platform hardware fed switch{ switch-number | active | standby} qos que stats internal cpu policer

Example:


Device# show platform hardware fed switch 1 qos que stat internal cpu policer

Displays the rates configured for the various traffic types.

Creating A User-Defined Class Map

Follow these steps to create user-defined class maps in system-cpp-policy and set the policer rates in bps

Procedure

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

class-map class-map-name

Example:


Device(config)# class-map example_class
Device(config-cmap)#

Specify the class map you want to create. Enters the class map configuration mode.
Step 4

exit

Example:


Device(config-cmap)# exit
Device(config)#

Exits the class map configuration mode.
Step 5

policy-map policy-map-name

Example:


Device(config)# policy-map system-cpp-policy
Device(config-pmap)#

Enter the policy map name. Enters the policy map configuration mode.
Step 6

class-map class-map-name

Example:


Device(config-pmap)# class example_class
Device(config-pmap-c)#

Enters the class action configuration mode. Enter the name of the class.
Step 7

[ no] police rate target_bit_rate

Example:

Device(config-pmap-c)# police 90000

Specifies the bit rate per second, enter a value between 8000 and 10000000000.

Note 

The police rate for user-defined class-maps must not exceed 10000 pps worth of traffic.
Step 8

end

Example:


Device(config-pmap-c-police)# end
Device#

Returns to the privileged EXEC mode.

Step 9

show policy-map control-plane

Example:

Device# show policy-map control-plane

Displays all the classes configured under system-cpp policy, including the user-defined class maps, and the rates configured.

Configuration Examples for CoPP

Example: Enabling a CPU Queue or Changing the Policer Rate of a CPU Queue

This example shows how to enable a CPU queue or to change the policer rate of a CPU queue. Here the class system-cpp-police-protocol-snooping CPU queue is enabled with the policer rate of 2000 pps . 


Device> enable
Device# configure terminal
Device(config)# policy-map system-cpp-policy
Device(config-pmap)# class system-cpp-police-protocol-snooping
Device(config-pmap-c)# police rate 2000 pps
Device(config-pmap-c-police)# end


Device# show policy-map control-plane
Control Plane 

  Service-policy input: system-cpp-policy

    <output truncated>

          
    Class-map: system-cpp-police-dot1x-auth (match-any)  
      0 packets, 0 bytes
      5 minute offered rate 0000 bps, drop rate 0000 bps
      Match: none 
      police:
          rate 1000 pps, burst 244 packets
        conformed 0 bytes; actions:
          transmit 
        exceeded 0 bytes; actions:
          drop 
          
    Class-map: system-cpp-police-protocol-snooping (match-any)  
      0 packets, 0 bytes
      5 minute offered rate 0000 bps, drop rate 0000 bps
      Match: none 
      police:
          rate 2000 pps, burst 488 packets
        conformed 0 bytes; actions:
          transmit 
        exceeded 0 bytes; actions:
          drop 
          
    <output truncated>
    
    Class-map: class-default (match-any)  
      0 packets, 0 bytes
      5 minute offered rate 0000 bps, drop rate 0000 bps
      Match: any

Example: Disabling a CPU Queue

This example shows how to disable a CPU queue. Here the class system-cpp-police-protocol-snooping CPU queue is disabled.

Example: Setting the Default Policer Rates for All CPU Queues

This example shows how to set the policer rates for all CPU queues to their default and then verify the setting.


Device> enable
Device# configure terminal
Device(config)# cpp system-default
Defaulting CPP : Policer rate for all classes will be set to their defaults
Device(config)# end


Device# show platform hardware fed switch 1 qos queue stats internal cpu policer
CPU Queue Statistics                  
============================================================================================
                                              (default) (set)     Queue        Queue
QId PlcIdx  Queue Name                Enabled   Rate     Rate      Drop(Bytes)  Drop(Frames)
--------------------------------------------------------------------------------------------
0    11     DOT1X Auth                  Yes     1000      1000     0            0          
1    1      L2 Control                  Yes     2000      2000     0            0          
2    14     Forus traffic               Yes     4000      4000     0            0          
3    0      ICMP GEN                    Yes     600       600      0            0          
4    2      Routing Control             Yes     5400      5400     0            0          
5    14     Forus Address resolution    Yes     4000      4000     0            0          
6    0      ICMP Redirect               Yes     600       600      0            0          
7    16     Inter FED Traffic           Yes     2000      2000     0            0          
8    4      L2 LVX Cont Pack            Yes     1000      1000     0            0          
9    16     EWLC Control                Yes     2000      2000     0            0          
10   16     EWLC Data                   Yes     2000      2000     0            0          
11   13     L2 LVX Data Pack            Yes     1000      1000     0            0          
12   0      BROADCAST                   Yes     600       600      0            0          
13   10     Openflow                    Yes     100       100      0            0          
14   13     Sw forwarding               Yes     1000      1000     0            0          
15   8      Topology Control            Yes     13000     13000    0            0          
16   12     Proto Snooping              Yes     2000      2000     0            0          
17   6      DHCP Snooping               Yes     500       500      0            0          
18   9      Transit Traffic             Yes     500       500      0            0          
19   10     RPF Failed                  Yes     100       100      0            0          
20   15     MCAST END STATION           Yes     2000      2000     0            0          
21   13     LOGGING                     Yes     1000      1000     0            0          
22   7      Punt Webauth                Yes     1000      1000     0            0          
23   18     High Rate App               Yes     13000     13000    0            0          
24   10     Exception                   Yes     100       100      0            0          
25   3      System Critical             Yes     1000      1000     0            0          
26   10     NFL SAMPLED DATA            Yes     100       200      0            0          
27   2      Low Latency                 Yes     5400      5400     0            0          
28   10     EGR Exception               Yes     100       100      0            0          
29   5      Stackwise Virtual OOB       Yes     8000      8000     0            0          
30   9      MCAST Data                  Yes     500       500      0            0          
31   10     Gold Pkt                    Yes     100       100      0            0          
          
* NOTE: CPU queue policer rates are configured to the closest hardware supported value
          
                      CPU Queue Policer Statistics               
====================================================================
Policer    Policer Accept   Policer Accept  Policer Drop  Policer Drop
  Index         Bytes          Frames        Bytes          Frames
-------------------------------------------------------------------
0          0                0               0             0          
1          0                0               0             0          
2          0                0               0             0          
3          0                0               0             0          
4          0                0               0             0          
5          0                0               0             0          
6          0                0               0             0          
7          0                0               0             0          
8          0                0               0             0          
9          0                0               0             0          
10         0                0               0             0          
11         0                0               0             0          
12         0                0               0             0          
13         0                0               0             0          
14         0                0               0             0          
15         0                0               0             0          
16         0                0               0             0          
17         0                0               0             0          
18         0                0               0             0          
          
                        CPP Classes to queue map 
======================================================================================
PlcIdx CPP Class                                :  Queues
--------------------------------------------------------------------------------------
0      system-cpp-police-data                   :  ICMP GEN/BROADCAST/ICMP Redirect/
10     system-cpp-police-sys-data               :  Openflow/Exception/EGR Exception/NFL SAMPLED DATA/Gold Pkt/RPF Failed/
13     system-cpp-police-sw-forward             :  Sw forwarding/LOGGING/L2 LVX Data Pack/
9      system-cpp-police-multicast              :  Transit Traffic/MCAST Data/
15     system-cpp-police-multicast-end-station  :  MCAST END STATION /
7      system-cpp-police-punt-webauth           :  Punt Webauth/
1      system-cpp-police-l2-control             :  L2 Control/
2      system-cpp-police-routing-control        :  Routing Control/Low Latency/
3      system-cpp-police-system-critical        :  System Critical/
4      system-cpp-police-l2lvx-control          :  L2 LVX Cont Pack/
8      system-cpp-police-topology-control       :  Topology Control/
11     system-cpp-police-dot1x-auth             :  DOT1X Auth/
12     system-cpp-police-protocol-snooping      :  Proto Snooping/
6      system-cpp-police-dhcp-snooping          :  DHCP Snooping/
14     system-cpp-police-forus                  :  Forus Address resolution/Forus traffic/
5      system-cpp-police-stackwise-virt-control :  Stackwise Virtual OOB/
16     system-cpp-default                       :  Inter FED Traffic/EWLC Control/EWLC Data/
18     system-cpp-police-high-rate-app          :  High Rate App/

Example: Creating a User-Defined Class Map

Device

This example shows how to create a user-defined class map, apply it to system-cpp-policy and display information about where the policy is applied.

A user-defined class map is applied to system-cpp-policy, which means that any control traffic matching the user-defined class map class-cpp-user is subject to the aggregate policer, under the user-defined class map. Statistics for the user defined traffic class are reported in Bytes. 


Device> enable
Device# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Device(config)# class-map match-any class-cpp-user
Device(config-cmap)# match dscp cs1
Device(config-cmap)# exit
Device(config)# policy-map system-cpp-policy
Device(config-pmap)# class class-cpp-user
Device(config-pmap-c)# police rate 2m bps
Device(config-pmap-c-police)# end

Device# show policy-map control-plane
<output truncated>
Class-map: class-cpp-user (match-any)  
      0 packets, 0 bytes
      5 minute offered rate 0000 bps, drop rate 0000 bps
      Match:  dscp cs1 (8)
      police:
          rate 2000000 bps, burst 62500 bytes
        conformed 0 bytes; actions:
          transmit 
        exceeded 0 bytes; actions:
          drop 
        conformed 0000 bps, exceeded 0000 bps
<output truncated>

When you add a user-defined class map to system-cpp-policy, the system automatically installs it on all 32 CPU queues, in addition to the control plane (resulting in 33 instances of the policy).

Note how the direction is display as egress (OUT), even though system-cpp-policy is applied in the ingress 


Device# show platform software fed switch active qos policy target status

TCG status summary:

Loc Interface             IIF-ID           Dir State:(cfg,opr) Policy              
--- --------------------- ---------------- --- --------------- --------------------
?:255 Control Plane       0x00000001000001 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-0          0x0000000100000d OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-1          0x0000000100000e OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-2          0x0000000100000f OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-3          0x00000001000010 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-4          0x00000001000011 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-5          0x00000001000012 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-6          0x00000001000013 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-7          0x00000001000014 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-8          0x00000001000015 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-9          0x00000001000016 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-10         0x00000001000017 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-11         0x00000001000018 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-12         0x00000001000019 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-13         0x0000000100001a OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-14         0x0000000100001b OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-15         0x0000000100001c OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-16         0x0000000100001d OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-17         0x0000000100001e OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-18         0x0000000100001f OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-19         0x00000001000020 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-20         0x00000001000021 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-21         0x00000001000022 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-22         0x00000001000023 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-23         0x00000001000024 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-24         0x00000001000025 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-25         0x00000001000026 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-26         0x00000001000027 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-27         0x00000001000028 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-28         0x00000001000029 OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-29         0x0000000100002a OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-30         0x0000000100002b OUT VALID,SET_INHW  system-cpp-policy
?:0 CoPP-Queue-31         0x0000000100002c OUT VALID,SET_INHW  system-cpp-policy

Monitoring CoPP

Use these commands to display policer settings, such as, traffic types and policer rates (user-configured and default rates) for CPU queues:

Command

Purpose

show policy-map control-plane

Displays the rates configured for the various traffic types

show policy-map system-cpp-policy

Displays all the classes configured under system-cpp policy, and policer rates

show platform hardware fed switch{ switch-number| active| standby} qos que stats internal cpu policer

Displays the rates configured for the various traffic types

show platform software fed { switch-number| active| standby} qos policy target status

Displays information about policy status and the target port type.

Feature History and Information for CoPP

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.

Feature

Release

Feature Information

Control Plane Policing (CoPP) or CPP

Cisco IOS XE 3.2SE

This feature was introduced.

CLI configuration for CoPP

Cisco IOS XE Denali 16.1.2

This feature was made user-configurable. CLI configuration options to enable and disable CPU queues, to change the policer rate, and to set policer rates to default.

User-defined class maps

Cisco IOS XE Everest 16.5.1a

Starting with this release, you can create class maps (with filters) and add these user-defined class maps to system-cpp-policy.

Changes in system-defined values for CoPP

Cisco IOS XE Everest 16.6.1

These new system-defined classes were introduced:

  • system-cpp-police-stackwise-virt-control

  • system-cpp-police-l2lvx-control

These new CPU queues were added to the existing system-cpp-default class:

  • WK_CPU_Q_UNUSED (7)

  • WK_CPU_Q_EWLC_CONTROL(9)

  • WK_CPU_Q_EWLC_DATA(10)

This new CPU queues was added to the existing system-cpp-police-sw-forward: WK_CPU_Q_L2_LVX_DATA_PACK (11)

This CPU queue is no longer available: WK_CPU_Q_SGT_CACHE_FULL(27)