H3C Control Plane-Based QoS Policy Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software version: Release 7577P04

Document version: 6W100-20190330

 

Contents

Introduction· 1

Prerequisites· 1

Example: Rate limiting ICMP packets· 1

Network configuration· 1

Analysis· 1

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 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.

Restrictions and guidelines

When you configure a control plane-based QoS policy to rate limit ICMP packets, follow these restrictions and guidelines:

·          By default, the predefined QoS policy is applied to the control plane. The predefined QoS policy identifies packet types by system index and uses a default rate limit value for each packet type. To display the predefined QoS policy, use the display qos policy control-plane pre-defined command.

·          You can use the if-match control-plane protocol or if-match control-plane protocol-group command to classify protocol packets.

·          You can only configure the car command or a combination of the car and accounting packet commands in the behavior associated with the class. Only the CIR value in the car command takes effect.

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 of the card in slot 1.

[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

Related documentation

·          H3C S7500E Switch Series ACL and QoS Configuration Guide-R757X

·          H3C S7500E Switch Series ACL and QoS Command Reference-R757X