Contents

Introduction· 1

Prerequisites· 1

Example: Rate limiting ICMP packets· 1

Network configuration· 1

Analysis· 1

Applicable hardware and software versions· 2

Procedures· 2

Verify the configuration· 3

Configuration files· 3

 

Introduction

This chapter provides examples for configuring control plane-based QoS policies.

Prerequisites

The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of QoS policies.

Example: Rate limiting ICMP packets

Network configuration

As shown in Figure 1, the device receives a large number of ICMP packets from the Internet. As a result, CPU usage is high, and device performance degrades.

Configure a control plane-based QoS policy to meet the following requirements:

·     Rate limit ICMP packets sent to the control plane to 320 kbps.

·     Drop excess ICMP packets.

Figure 1 Network diagram

 

Analysis

To meet the network requirements, you must perform the following tasks:

·     Use the if-match command to classify ICMP packets into a class.

·     Use the car command to configure the rate limit value for ICMP packets and drop excess packets.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

 

Hardware	Software version
S6520XE-HI switch series	Supported in Release 11xx
S5560X-EI switch series	Not supported
S5500V2-EI switch series	Not supported
MS4520V2-30F switch	Not supported
S5560S-EI switch series S5560S-SI switch series	Not supported
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Not supported
S5120V2-SI switch series S5120V2-LI switch series	Not supported
S3100V3-EI switch series S3100V3-SI switch series	Not supported
S5110V2 switch series	Not supported
S5110V2-SI switch series	Not supported
S5000V3-EI switch series	Not supported
S5000E-X switch series	Not supported
WAS6000 switch series	Not supported
E128C switch E152C switch E500C switch series E500D switch series	Not supported
MS4520V2 switch series (except the MS4520V2-30F switch)	Not supported
MS4320V2 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Not supported
WS5850-WiNet switch series	Not supported
WS5820-WiNet switch series WS5810-WiNet switch series	Not supported

 

Procedures

# Create a class named ICMP, and use the ICMP protocol as the match criterion.

<Device> system-view

[Device] traffic classifier ICMP

[Device-classifier-ICMP] if-match control-plane protocol icmp

[Device-classifier-ICMP] quit

# Create a behavior named ICMP, and configure a CAR action for ICMP packets.

[Device] traffic behavior ICMP

[Device-behavior-ICMP] car cir 320

[Device-behavior-ICMP] quit

# Create a QoS policy named ICMP, and associate the class ICMP with the behavior ICMP in the QoS policy.

[Device] qos policy ICMP

[Device-qospolicy-ICMP] classifier ICMP behavior ICMP

[Device-qospolicy-ICMP] quit

# Apply the QoS policy ICMP to the inbound direction of the control plane.

[Device] control-plane slot 1

[Device-cp-slot1] qos apply policy ICMP inbound

[Device-cp-slot1] quit

Verify the configuration

# Verify that the QoS policy is correctly applied to the control plane.

[Device] display qos policy control-plane slot 1

Control plane slot 1

  Direction: Inbound

  Policy: ICMP

   Classifier: ICMP

     Operator: AND

     Rule(s) :

      If-match control-plane protocol icmp

     Behavior: ICMP

      Committed Access Rate:

        CIR 320 (kbps), CBS 20480 (Bytes), EBS 0 (Bytes)

        Green action  : pass

        Yellow action : pass

        Red action    : discard

        Green packets : 0 (Packets)

        Red packets   : 0 (Packets)

Configuration files

#

traffic classifier ICMP operator and

 if-match control-plane protocol icmp

#

traffic behavior ICMP

 car cir 320 cbs 20480 ebs 0 green pass red discard yellow pass

#

qos policy ICMP

 classifier ICMP behavior ICMP

#

control-plane slot 1

 qos apply policy ICMP inbound