H3C S12500R Switch Router Series
Control Plane-Based QoS Policy Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contents

Introduction· 1

Prerequisites· 1

Example: Rate limiting ICMP packets· 1

Network configuration· 1

Analysis· 1

Software versions used· 2

Restrictions and guidelines· 2

Procedures· 2

Verify the configuration· 2

Configuration files· 3

Related documentation· 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 pps.

·     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.

Software versions used

This configuration example was created and verified on Release 3606.

Restrictions and guidelines

By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

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] packet-rate 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

      Packet rate: 320 (pps)

Configuration files

#

traffic classifier ICMP operator and

 if-match control-plane protocol icmp

#

traffic behavior ICMP

 packet-rate 320

#

qos policy ICMP

 classifier ICMP behavior ICMP

#

control-plane slot 1

 qos apply policy ICMP inbound

#

Related documentation

·     H3C S12500R Switch Router Series ACL and QoS Command Reference-R3606

·     H3C S12500R Switch Router Series ACL and QoS Configuration Guide-R3606