H3C S3100V2-52TP Configuration manual

H3C S3100V2-52TP Switch

Network Management and Monitoring

Configuration Guide

Hangzhou H3C Technologies Co., Ltd.

http://www.h3c.com

Software version: Release 2101

Document version: 6W100-20110905

No part of this manual may be reproduced or transmitted in any form or by any means without prior

written consent of Hangzhou H3C Technologies Co., Ltd.

Trademarks

H3C,

, Aolynk, , H

3

Care,

, TOP G, , IRF, NetPilot, Neocean, NeoVTL,

SecPro, SecPoint, SecEngine, SecPath, Comware, Secware, Storware, NQA, VVG, V

2

G, V

n

G, PSPT,

XGbus, N-Bus, TiGem, InnoVision and HUASAN are trademarks of Hangzhou H3C Technologies Co.,

Ltd.

All other trademarks that may be mentioned in this manual are the property of their respective owners

Notice

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute the warranty of any kind, express or implied.

Preface

The H3C S3100V2-52TP documentation set includes 10 configuration guides, which describe the

software features for the H3C S3100V2-52TP Switch Release 2101, and guide you through the software

configuration procedures. These configuration guides also provide configuration examples to help you

apply software features to different network scenarios.

The Network Management and Monitoring Configuration Guide describes network management and

monitoring fundamentals and configuration. It describes how to view the system information, collect

traffic statistics, assess the network performance, synchronize time for all devices with clocks in your

network, and use the ping, tracert, and debug commands to check and debug the current network

connectivity.

This preface includes:

• Audience

• Conventions

• About the S3100V2-52TP documentation set

• Obtaining documentation

• Technical support

• Documentation feedback

Audience

This documentation is intended for:

• Network planners

• Field technical support and servicing engineers

• Network administrators working with the S3100V2-52TP Switch

Conventions

This section describes the conventions used in this documentation set.

Command conventions

Convention Description

Boldface Bold text represents commands and keywords that you enter literally as shown.

Italic Italic text represents arguments that you replace with actual values.

[ ] Square brackets enclose syntax choices (keywords or arguments) that are optional.

{ x | y | ... }

Braces enclose a set of required syntax choices separated by vertical bars, from which

you select one.

[ x | y | ... ]

Square brackets enclose a set of optional syntax choices separated by vertical bars, from

which you select one or none.

Convention Description

{ x | y | ... } *

Asterisk marked braces enclose a set of required syntax choices separated by vertical

bars, from which you select at least one.

[ x | y | ... ] *

Asterisk marked square brackets enclose optional syntax choices separated by vertical

bars, from which you select one choice, multiple choices, or none.

&<1-n>

The argument or keyword and argument combination before the ampersand (&) sign can

be entered 1 to n times.

# A line that starts with a pound (#) sign is comments.

GUI conventions

Convention Description

Boldface

Window names, button names, field names, and menu items are in Boldface. For

example, the New User window appears; click OK.

> Multi-level menus are separated by angle brackets. For example, File > Create > Folder.

Symbols

Convention Description

WARNING

An alert that calls attention to important information that if not understood or followed can

result in personal injury.

CAUTION

An alert that calls attention to important information that if not understood or followed can

result in data loss, data corruption, or damage to hardware or software.

IMPORTANT

An alert that calls attention to essential information.

NOTE

An alert that contains additional or supplementary information.

TIP

An alert that provides helpful information.

Network topology icons

Represents a generic network device, such as a router, switch, or firewall.

Represents a routing-capable device, such as a router or Layer 3 switch.

Represents a generic switch, such as a Layer 2 or Layer 3 switch, or a router that supports

Layer 2 forwarding and other Layer 2 features.

Port numbering in examples

The port numbers in this document are for illustration only and might be unavailable on your device.

About the S3100V2-52TP documentation set

The H3C S3100V2-52TP documentation set includes:

Documents Purposes

Product description and specifications

Marketing brochures Describe product specifications and benefits.

Technology white papers

Provide an in-depth description of software features and

technologies.

Hardware specifications and installation

Compliance and safety manuals

CE DOCs

Provide regulatory information and the safety instructions that must be

followed during installation.

Installation quick starts

Guides you through initial installation and setup procedures to help

you quickly set up your device.

Installation guides Provides a complete guide to switch installation and specifications.

H3C Low End Series Ethernet Switches

Pluggable Modules Manual

Describes the specifications of pluggable transceiver modules.

Pluggable SFP[SFP+][XFP] Transceiver

Modules Installation Guide

Describe the installation, and replacement of SFP/SFP+/XFP

transceiver modules.

Software configuration

Configuration guides Describe software features and configuration procedures.

Command references Provide a quick reference to all available commands.

Operations and maintenance

H3C Series Ethernet Switches Login

Password Recovery Manual

Helps you deal with switch login password loss.

Release notes

Provide information about the product release, including the version

history, hardware and software compatibility matrix, version

upgrade information, technical support information, and software

upgrading.

Obtaining documentation

You can access the most up-to-date H3C product documentation on the World Wide Web at

http://www.h3c.com

.

Click the links on the top navigation bar to obtain different categories of product documentation:

[Technical Support & Documents > Technical Documents]

– Provides hardware installation, software

upgrading, and software feature configuration and maintenance documentation.

[Products & Solutions]

– Provides information about products and technologies, as well as solutions.

[Technical Support & Documents > Software Download]

– Provides the documentation released with the

software version.

Technical support

cu[email protected]

http://www.h3c.com

Documentation feedback

You can e-mail your comments about product documentation to info@h3c.com.

We appreciate your comments.

i

Contents

System maintenance and debugging ························································································································· 1

Ping·····················································································································································································1

Introduction ·······························································································································································1

Configuring ping ······················································································································································1

Ping configuration example ····································································································································1

Tracert ················································································································································································3

Introduction ·······························································································································································3

Configuring tracert ···················································································································································4

System debugging ····························································································································································5

Introduction to system debugging···························································································································5

Displaying debugging information·························································································································5

Configuring system debugging·······························································································································6

Ping and tracert configuration example ·························································································································7

NTP configuration ························································································································································ 9

NTP overview ····································································································································································9

Applications of NTP ·················································································································································9

Advantages of NTP ··················································································································································9

How NTP works····················································································································································· 10

NTP message format ············································································································································· 11

Operation modes of NTP ····································································································································· 12

NTP configuration task list············································································································································· 14

Configuring the operation modes of NTP ··················································································································· 15

Operation modes and static and dynamic associations··················································································· 15

Configuring NTP client/server mode ·················································································································· 15

Configuring the NTP symmetric peers mode······································································································ 16

Configuring NTP broadcast mode······················································································································· 16

Configuring NTP multicast mode ························································································································· 17

Configuring optional parameters of NTP ···················································································································· 18

Specifying the source interface for NTP messages···························································································· 18

Disabling an interface from receiving NTP messages······················································································· 18

Configuring the maximum number of dynamic sessions allowed···································································· 19

Configuring access-control rights ································································································································· 19

Configuration prerequisites ·································································································································· 19

Configuration procedure ······································································································································ 19

Configuring NTP authentication ··································································································································· 20

Configuration prerequisites ·································································································································· 20

Configuration procedure ······································································································································ 20

Displaying and maintaining NTP ································································································································· 22

NTP configuration examples········································································································································· 22

Configuring NTP client/server mode ·················································································································· 22

Configuring the NTP symmetric mode ················································································································ 23

Configuring NTP broadcast mode······················································································································· 25

Configuring NTP multicast mode ························································································································· 27

Configuring NTP client/server mode with authentication················································································· 29

Configuring NTP broadcast mode with authentication ····················································································· 30

Information center configuration·······························································································································34

Information center overview·········································································································································· 34

Introduction to information center························································································································ 34

ii

Classification of system information ···················································································································· 35

System information levels ····································································································································· 35

System information channels and output destinations······················································································· 35

Outputting system information by source module······························································································ 36

Default output rules of system information ·········································································································· 36

System information format···································································································································· 37

Configuring information center····································································································································· 40

Information center configuration task list ············································································································ 40

Outputting system information to the console····································································································· 40

Outputting system information to a monitor terminal ························································································ 41

Outputting system information to a log host······································································································· 42

Outputting system information to the trap buffer································································································ 43

Outputting system information to the log buffer································································································· 44

Outputting system information to the SNMP module························································································· 45

Outputting system information to the web interface ·························································································· 45

Saving system information to a log file··············································································································· 46

Saving security logs into the security log file······································································································ 47

Configuring synchronous information output ····································································································· 50

Disabling a port from generating link up/down logging information····························································· 51

Displaying and maintaining information center ········································································································· 51

Information center configuration examples ················································································································· 52

Outputting log information to a UNIX log host ·································································································· 52

Outputting log information to a Linux log host··································································································· 54

Outputting log information to the console ·········································································································· 55

Saving security logs into the security log file······································································································ 56

SNMP configuration ··················································································································································59

SNMP overview······························································································································································ 59

SNMP mechanism ················································································································································· 59

SNMP protocol versions ······································································································································· 60

SNMP configuration task list········································································································································· 60

Configuring basic SNMP settings ································································································································ 60

Configuring basic SNMPv3 settings ··················································································································· 60

Configuring basic SNMPv1 or SNMPv2c settings ···························································································· 62

Configuring network management-specific interface index ······················································································ 63

About the network management-specific interface index ················································································· 63

Switching the format of an NM-specific ifindex································································································· 63

Configuring SNMP logging ·········································································································································· 64

Introduction to SNMP logging ····························································································································· 64

Enabling SNMP logging······································································································································· 64

Configuring SNMP traps··············································································································································· 65

Introduction to SNMP traps ·································································································································· 65

Enabling SNMP traps ··········································································································································· 65

Configuring trap sending parameters················································································································· 66

Displaying and maintaining SNMP ····························································································································· 67

SNMP configuration examples····································································································································· 67

SNMPv1/SNMPv2c configuration example ······································································································ 67

SNMPv3 configuration example·························································································································· 69

SNMP logging configuration example ··············································································································· 71

MIB style configuration ··············································································································································73

Overview········································································································································································· 73

Setting the MIB style······················································································································································· 73

Displaying and maintaining MIB style························································································································· 73

iii

RMON configuration·················································································································································74

RMON overview ···························································································································································· 74

Introduction ···························································································································································· 74

Working mechanism············································································································································· 74

RMON groups ······················································································································································· 74

Configuring the RMON statistics function ··················································································································· 76

Configuring the RMON Ethernet statistics function···························································································· 77

Configuring the RMON history statistics function ······························································································ 77

Configuring the RMON alarm function ······················································································································· 77

Configuration prerequisites ·································································································································· 77

Configuration procedure ······································································································································ 78

Displaying and maintaining RMON ···························································································································· 78

Ethernet statistics group configuration example·········································································································· 79

History group configuration example ·························································································································· 80

Alarm group configuration example···························································································································· 82

Port mirroring configuration ······································································································································84

Introduction to port mirroring········································································································································ 84

Terminologies of port mirroring ··························································································································· 84

Port mirroring classification and implementation······························································································· 85

Configuring local port mirroring ·································································································································· 87

Local port mirroring configuration task list ········································································································· 87

Creating a local mirroring group ························································································································ 88

Configuring source ports for the local mirroring group ···················································································· 88

Configuring source CPUs for the local mirroring group···················································································· 89

Configuring the monitor port for the local mirroring group·············································································· 89

Using the remote probe VLAN to enable local mirroring to support multiple monitor ports························· 90

Configuring Layer 2 remote port mirroring ················································································································· 91

Layer 2 remote port mirroring configuration task list ························································································ 91

Configuring a remote source group (on the source device) ············································································· 92

Configuring a remote destination group (on the destination device) ······························································ 95

Configuring Layer 3 remote port mirroring ················································································································· 97

Layer 3 remote port mirroring configuration task list ························································································ 97

Configuration prerequisites ·································································································································· 97

Configuring local mirroring groups····················································································································· 97

Configuring source ports for a local mirroring group ······················································································· 98

Configuring source CPUs for a local mirroring group ······················································································ 98

Configuring the monitor port for a local mirroring group················································································· 99

Displaying and maintaining port mirroring················································································································· 99

Port mirroring configuration examples·······················································································································100

Local port mirroring configuration example ·····································································································100

Local port mirroring with multiple monitor ports configuration example·······················································101

Layer 2 remote port mirroring configuration example ····················································································102

Layer 3 remote port mirroring configuration example ····················································································104

Traffic mirroring configuration ······························································································································· 107

Introduction to traffic mirroring···································································································································107

Traffic mirroring configuration task list ······················································································································107

Configuring traffic mirroring·······································································································································107

Configuring match criteria ·································································································································107

Configuring traffic mirroring of different types ································································································108

Configuring a QoS policy ··································································································································109

Applying a QoS policy·······································································································································109

Configuring remote traffic mirroring ·················································································································110

Displaying and maintaining traffic mirroring············································································································111

iv

Traffic mirroring configuration example ····················································································································111

Traffic mirroring configuration example ···········································································································111

NQA configuration················································································································································· 114

NQA overview ·····························································································································································114

NQA features ······················································································································································114

NQA concepts·····················································································································································116

NQA probe operation procedure ·····················································································································117

NQA configuration task list ········································································································································117

Configuring the NQA server ······································································································································118

Enabling the NQA client·············································································································································118

Creating an NQA test group······································································································································119

Configuring an NQA test group ································································································································119

Configuring ICMP echo tests······························································································································119

Configuring DHCP tests ······································································································································120

Configuring DNS tests ········································································································································121

Configuring FTP tests···········································································································································122

Configuring HTTP tests ········································································································································123

Configuring UDP jitter tests·································································································································124

Configuring SNMP tests ·····································································································································126

Configuring TCP tests··········································································································································126

Configuring UDP echo tests································································································································127

Configuring voice tests ·······································································································································128

Configuring DLSw tests ·······································································································································130

Configuring the collaboration function ······················································································································131

Configuring threshold monitoring·······························································································································131

Configuring the NQA statistics collection function···································································································133

Configuring the history records saving function ·······································································································133

Configuring optional parameters for an NQA test group·······················································································134

Configuring a schedule for an NQA test group·······································································································135

Displaying and maintaining NQA·····························································································································136

NQA configuration examples ····································································································································136

ICMP echo test configuration example ·············································································································136

DHCP Test configuration example·····················································································································138

DNS test configuration example························································································································139

FTP test configuration example ··························································································································141

HTTP test configuration example························································································································142

UDP jitter test configuration example ················································································································143

SNMP test configuration example ·····················································································································146

TCP test configuration example ·························································································································147

UDP echo test configuration example ···············································································································149

Voice test configuration example ······················································································································150

DLSw test configuration example·······················································································································153

NQA collaboration configuration example······································································································154

sFlow configuration················································································································································· 157

sFlow overview·····························································································································································157

Introduction to sFlow ···········································································································································157

sFlow operation ···················································································································································157

Configuring sFlow························································································································································158

Configuring the sFlow agent and sFlow collector····························································································158

Configuring flow sampling·································································································································158

Configuring counter sampling····························································································································159

Displaying and maintaining sFlow·····························································································································159

sFlow configuration example······································································································································159

v

Troubleshooting sFlow configuration ·························································································································161

IPC configuration····················································································································································· 162

IPC overview·································································································································································162

Node·····································································································································································162

Link········································································································································································162

Channel ································································································································································162

Packet sending modes ········································································································································163

Enabling IPC performance statistics ···························································································································163

Displaying and maintaining IPC·································································································································164

Cluster management configuration························································································································ 165

Cluster management overview ···································································································································165

Why cluster management···································································································································165

Roles in a cluster··················································································································································165

How a cluster works············································································································································166

Cluster management configuration task list···············································································································169

Configuring the management switch ·························································································································170

Enabling NDP globally and for specific ports··································································································170

Configuring NDP parameters ····························································································································171

Enabling NTDP globally and for specific ports································································································171

Configuring NTDP parameters···························································································································172

Manually collecting topology information ········································································································173

Enabling the cluster function ······························································································································173

Establishing a cluster···········································································································································173

Enabling management VLAN auto-negotiation································································································174

Configuring communication between the management switch and the member switches within a cluster

··············································································································································································175

Configuring cluster management protocol packets ·························································································175

Cluster member management ····························································································································176

Configuring the member switches ······························································································································177

Enabling NDP ······················································································································································177

Enabling NTDP ····················································································································································177

Manually collecting topology information ········································································································177

Enabling the cluster function ······························································································································177

Deleting a member switch from a cluster··········································································································177

Configuring access between the management switch and its member switches··················································177

Adding a candidate switch to a cluster·····················································································································178

Configuring advanced cluster management functions ·····························································································178

Configuring topology management ··················································································································178

Configuring interaction for a cluster··················································································································179

SNMP configuration synchronization function·································································································180

Configuring web user accounts in batches ······································································································181

Displaying and maintaining cluster management ····································································································182

Cluster management configuration example ············································································································182

Stack configuration ················································································································································· 186

Stack configuration overview······································································································································186

Introduction to stack ············································································································································186

Establishing a stack·············································································································································187

Stack configuration task list·········································································································································187

Configuring the master device of a stack··················································································································187

Configuring a private IP address pool for a stack···························································································187

Configuring stack ports·······································································································································188

Creating a stack ··················································································································································188

Configuring stack ports of a slave device ·················································································································188

vi

Logging in to the CLI of a slave from the master ······································································································189

Displaying and maintaining stack configuration ······································································································189

Stack configuration example ······································································································································189

CWMP configuration·············································································································································· 191

CWMP overview··························································································································································191

CWMP network framework································································································································191

Basic functions of CWMP ···········································································································································192

Automatic configuration file deployment ··········································································································192

CPE system file management ·····························································································································192

CPE status and performance monitoring···········································································································193

CWMP mechanism ······················································································································································193

Auto-connection between the ACS and a CPE ································································································193

Configuration parameter deployment ···············································································································194

RPC methods ························································································································································194

Active and standby ACS switchover ·················································································································195

CWMP configuration tasks ·········································································································································196

Configuring the DHCP server·····························································································································196

Configuring the DNS server·······························································································································197

Configuring the ACS server ·······························································································································197

Configuring CPEs ················································································································································197

Enabling CWMP ··························································································································································197

Configuring the ACS server ········································································································································198

Configuring the ACS URL ···································································································································198

Configuring the ACS username and password ·······························································································198

Configuring CPE attributes ··········································································································································199

Configuring the CPE username and password ································································································199

Configuring the CWMP connection interface ··································································································200

Sending Inform messages···································································································································200

Configuring the maximum number of attempts made to retry a connection·················································201

Configuring the close-wait timer of the CPE ·····································································································201

Displaying and maintaining CWMP··························································································································202

CWMP configuration example···································································································································202

Network requirements·········································································································································202

Configuration procedure ····································································································································203

Index ········································································································································································ 211

1

System maintenance and debugging

You can use the ping command and the tracert command to verify network connectivity, and use the

debug command to enable debugging and thus to diagnose system faults based on the debugging

information.

Ping

Introduction

The ping command allows you to verify whether a device with a specified address is reachable, and to

examine network connectivity.

The ping function is implemented through the Internet Control Message Protocol (ICMP):

1. The source device sends an ICMP echo request to the destination device.

2. The source device determines whether the destination is reachable based on whether it receives an

ICMP echo reply. If the destination is reachable, the source device determines the following:

{ The link quality, based on the numbers of ICMP echo requests sent and replies received.

{ The distance between the source and destination, based on the round trip time of ping packets.

Configuring ping

Follow the step below to configure the ping function:

To do… Use the command… Remarks

IPv4 network:

ping [ ip ] [ -a source-ip | -c count | -f | -h ttl |

-i interface-type interface-number | -m interval

| -n | -p pad | -q | -r | -s packet-size | -t

timeout | -tos tos | -v ] * host

Check whether a specified

address in an IP network is

reachable

IPv6 network:

ping ipv6 [ -a source-ipv6 | -c count | -m

interval | -s packet-size | -t timeout ] * host [ -i

interface-type interface-number ]

Required

Use one of the commands

Available in any view

NOTE:

When configuring the ping command for a low-speed network, H3C recommends that you set a

larger value for the timeout timer (indicated by the -t parameter in the command).

Ping configuration example

Network requirements

As shown in Figure 1, check whether Device A and Device C can reach each other. If they can reach each

other, obtain the detailed information about routes from Device A to Device C.

2

Figure 1 Network diagram

Configuration procedure

# Use the ping command to display whether Device A and Device C can reach each other.

<DeviceA> ping 1.1.2.2

PING 1.1.2.2: 56 data bytes, press CTRL_C to break

Reply from 1.1.2.2: bytes=56 Sequence=1 ttl=254 time=205 ms

Reply from 1.1.2.2: bytes=56 Sequence=2 ttl=254 time=1 ms

Reply from 1.1.2.2: bytes=56 Sequence=3 ttl=254 time=1 ms

Reply from 1.1.2.2: bytes=56 Sequence=4 ttl=254 time=1 ms

Reply from 1.1.2.2: bytes=56 Sequence=5 ttl=254 time=1 ms

--- 1.1.2.2 ping statistics ---

5 packet(s) transmitted

5 packet(s) received

0.00% packet loss

round-trip min/avg/max = 1/41/205 ms

# Get the detailed information about routes from Device A to Device C.

<DeviceA> ping -r 1.1.2.2

PING 1.1.2.2: 56 data bytes, press CTRL_C to break

Reply from 1.1.2.2: bytes=56 Sequence=1 ttl=254 time=53 ms

Record Route:

1.1.2.1

1.1.2.2

1.1.1.2

1.1.1.1

Reply from 1.1.2.2: bytes=56 Sequence=2 ttl=254 time=1 ms

Record Route:

1.1.2.1

1.1.2.2

1.1.1.2

1.1.1.1

Reply from 1.1.2.2: bytes=56 Sequence=3 ttl=254 time=1 ms

Record Route:

1.1.2.1

1.1.2.2

1.1.1.2

3

1.1.1.1

Reply from 1.1.2.2: bytes=56 Sequence=4 ttl=254 time=1 ms

Record Route:

1.1.2.1

1.1.2.2

1.1.1.2

1.1.1.1

Reply from 1.1.2.2: bytes=56 Sequence=5 ttl=254 time=1 ms

Record Route:

1.1.2.1

1.1.2.2

1.1.1.2

1.1.1.1

--- 1.1.2.2 ping statistics ---

5 packet(s) transmitted

5 packet(s) received

0.00% packet loss

round-trip min/avg/max = 1/11/53 ms

The principle of ping -r is as shown in Figure 1.

1. The source (Device A) sends an ICMP echo request with the RR option being empty to the

destination (Device C).

2. The intermediate device (Device B) adds the IP address (1.1.2.1) of its outbound interface to the RR

option of the ICMP echo request, and forwards the packet.

3. Upon receiving the request, the destination device copies the RR option in the request and adds the

IP address (1.1.2.2) of its outbound interface to the RR option. Then the destination device sends

an ICMP echo reply.

4. The intermediate device adds the IP address (1.1.1.2) of its outbound interface to the RR option in

the ICMP echo reply, and then forwards the reply.

5. Upon receiving the reply, the source device adds the IP address (1.1.1.1) of its inbound interface

to the RR option. Finally, you can get the detailed information of routes from Device A to Device C:

1.1.1.1 <-> {1.1.1.2; 1.1.2.1} <-> 1.1.2.2.

Tracert

Introduction

To check whether a network is available, you can use the tracert command to trace the Layer 3 device

involved in delivering an IP packet from source to destination. This is useful for identification of failed

nodes in the event of network failure.

4

Figure 2 Network diagram

The tracert function is implemented through ICMP, as shown in Figure 2:

1. The source (Device A) sends a packet with a TTL value of 1 to the destination (Device D). The UDP

port of the packet is a port number that will not be used by any application of the destination.

2. The first hop (Device B) (the Layer 3 device that first receives the packet) responds by sending a

TTL-expired ICMP error message to the source, with its IP address 1.1.1.2 encapsulated. In this

way, the source device receives the address (1.1.1.2) of the first Layer 3 device.

3. The source device sends a packet with a TTL value of 2 to the destination device.

4. The second hop (Device C) responds with a TTL-expired ICMP error message, which gives the

source device the address (1.1.2.2) of the second Layer 3 device.

5. The above process continues until the ultimate destination device is reached. No application of the

destination uses this UDP port. Therefore, the destination replies a port unreachable ICMP error

message with the destination IP address 1.1.3.2.

6. When the source device receives the port unreachable ICMP error message, it knows that the

packet has reached the destination, and that it has received the addresses of all the Layer 3

devices involved in delivering the packet to the destination device (1.1.1.2, 1.1.2.2, 1.1.3.2).

Configuring tracert

Configuration prerequisites

For an IPv4 network:

• Enable sending of ICMP timeout packets on the intermediate device (the device between the source

and destination devices). If the intermediate device is an H3C device, execute the ip ttl-expires

enable command on the device. For more information about this command, see Layer 3—IP

Services Command Reference.

• Enable sending of ICMP destination unreachable packets on the destination device. If the

destination device is an H3C device, execute the ip unreachables enable command. For more

information about this command, see Layer 3—IP Services Command Reference.

For an IPv6 network:

• Enable sending of ICMPv6 timeout packets on the intermediate device (the device between the

source and destination devices). If the intermediate device is an H3C device, execute the ipv6

hoplimit-expires enable command on the device. For more information about this command, see

Layer 3—IP Services Command Reference.

5

• Enable sending of ICMPv6 destination unreachable packets on the destination device. If the

destination device is an H3C device, execute the ipv6 unreachables enable command. For more

information about this command, see Layer 3—IP Services Command Reference.

Tracert configuration

Follow the step below to configure tracert:

To do… Use the command… Remarks

IPv4 network:

tracert [ -a source-ip | -f first-ttl | -m

max-ttl | -p port | -q packet-number

| -w timeout ] * host

Display the routes from source to

destination

IPv6 network:

tracert ipv6 [ -f first-ttl | -m max-ttl |

-p port | -q packet-number | -w

timeout ] * host

Required

Use one of the commands

Available in any view

System debugging

Introduction to system debugging

The device provides various debugging functions. For the majority of protocols and features supported,

the system provides debugging information to help users diagnose errors.

The following two switches control the display of debugging information:

• Protocol debugging switch: Controls protocol-specific debugging information.

• Screen output switch: Controls whether to display the debugging information on a certain screen.

Displaying debugging information

As shown in Figure 3, assume that the device can provide debugging for the three modules 1, 2, and 3.

The debugging information can be output on a terminal only when both the protocol debugging switch

and the screen output switch are turned on.

6

Figure 3 The relationship between the protocol and screen output switch

Configuring system debugging

Administrators usually use the debugging commands to diagnose network failure. However, output of the

debugging information may reduce system efficiency. Therefore, when debugging is completed, disable

the debugging function that was used, or use the undo debugging all command to disable all the

debugging functions.

Output of debugging information depends on the configurations of the information center and the

debugging commands of each protocol and functional module. Debugging information is commonly

output to a terminal (including console or VTY) for display. You can also output debugging information

to other destinations. For more information, see Network Management and Monitoring Command

Reference. By default, you can output debugging information to a terminal by following these steps:

To do… Use the command… Remarks

Enable the terminal

monitoring of system

information

terminal monitor

Optional

The terminal monitoring on the console is

enabled by default and the terminal

monitoring on the monitoring terminal is

disabled by default.

Available in user view

Enable the terminal display of

debugging information

terminal debugging

Required

Disabled by default

Available in user view

Enable debugging for a

specified module

debugging { all [ timeout time ] |

module-name [ option ] }

Required

Disabled by default

Available in user view

7

To do… Use the command… Remarks

Display the enabled

debugging functions

display debugging [ interface

interface-type interface-number ]

[ module-name ] [ | { begin |

exclude | include }

regular-expression ]

Optional

Available in any view

NOTE:

You must configure the debugging, terminal debugging and terminal monitor commands before

you can display the detailed debugging information on the terminal. For more information about

the terminal debugging and terminal monitor commands, see

Network Management and

Monitoring Command Reference

.

Ping and tracert configuration example

Network requirements

As shown in Figure 4, Device A failed to telnet Device C. Determine whether Device A and Device C can

reach each other. If they cannot reach each other, locate the failed nodes in the network.

Figure 4 Network diagram

Configuration procedure

# Use the ping command to display whether Device A and Device C can reach each other.

<DeviceA> ping 1.1.2.2

PING 1.1.2.2: 56 data bytes, press CTRL_C to break

Request time out

--- 1.1.2.2 ping statistics ---

5 packet(s) transmitted

0 packet(s) received

100.00% packet loss

# Device A and Device C cannot reach each other. Use the tracert command to determine failed nodes.

<DeviceA> system-view

[DeviceA] ip ttl-expires enable

[DeviceA] ip unreachables enable

[DeviceA] tracert 1.1.2.2

traceroute to 1.1.2.2(1.1.2.2) 30 hops max,40 bytes packet, press CTRL_C to bre

ak

1 1.1.1.2 14 ms 10 ms 20 ms

8

2 * * *

3 * * *

4 * * *

5

The output shows that Device A and Device C cannot reach other, Device A and Device B can reach each

other, and an error has occurred on the connection between Device B and Device C. In this case, use the

debugging ip icmp command to enable ICMP debugging on Device A and Device C to check whether

the devices send or receive the specified ICMP packets, or use the display ip routing-table command to

display whether Device A and Device C can reach each other.

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H3C S3100V2-52TP Configuration manual

H3C S3100V2-52TP Configuration manual

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