H3C S5500-EI Series Configuration manual

H3C S5500-SI/EI Series Ethernet Switches

Layer 2 - LAN Switching Configuration Guide

Hangzhou H3C Technologies Co., Ltd.

http://www.h3c.com

Software version: Release 2208

Document version: 6W100-20101224

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 S5500-SI/EI documentation set includes 10 configuration guides, which describe

the software features for the H3C S5500-SI and S5500-EI Series Ethernet Switches,

Release2208, 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 Layer 2—LAN Switching Configuration Guide describes LAN switching fundamentals

and configuration. It describes how to implement flow control and load sharing, isolate

uses in the same VLAN, eliminate Layer 2 loops, divide VLANs, transmit customer network

packets through the public network, and modify VLAN tags for packets.

This preface includes:

•

Audience

•

Added and modified features

•

Conventions

•

About the H3C S5500-SI/EI 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 S5500-SI/EI series

Added and modified features

Compared to Release2202, Release2208 adds the following features:

Configuration guide Added and modified features

Ethernet interface

configuration

Added features:

• Configuring the link mode for an Ethernet interface, and

configuring flow control, the physical state change

suppression interval, loopback testing, the statistics polling

interval, and auto power-down for a Layer 3 Ethernet

interface (available only on the S5500-EI)

• Configuring link down suppression

• Configuring the MTU for a Layer 3 Ethernet interface

• Configuring single-port loopback and multi-port loopback

detection

• Enabling auto power-down on an Ethernet interface for

energy efficiency

• Enabling bridging on a Layer 2 Ethernet interface

Configuration guide Added and modified features

Loopback and null interface

configuration

—

MAC address table

configuration

—

MAC Information configuration —

Ethernet link aggregation

configuration

Added features:

• Setting the LACP timeout interval

• Enabling local-first load sharing for link aggregation

• Enabling link aggregation traffic redirection

Port Isolation configuration —

MSTP configuration Added features: Displaying the BPDU statistics on ports

BPDU tunneling configuration —

VLAN configuration

Added features: Configuring dynamic MAC-based VLAN

assignment

Super VLAN configuration

(available only on the S5500-EI)

Added features: Super VLAN

Isolate-User-VLAN configuration

Added features:

• Configuring the isolate-user-VLAN type for a port

• Configuring Layer 2 isolation for ports in the same secondary

VLAN

Voice VLAN configuration

Added features: Configuring the QoS priority settings for voice

packets

GVRP configuration —

QinQ configuration

Added features:

• VLAN transparent transmission

• Inner-outer VLAN 802.1p priority mapping

• Inner VLAN ID substitution (available only on the S5500-EI)

VLAN mapping configuration

(available only on the S5500-EI)

—

LLDP configuration

Added features: Support of Layer 3 Ethernet interfaces for LLDP

(available only on the S5500-EI)

Service loopback group

configuration (available only

on the S5500-EI)

—

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.

{ 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 may select 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.

About the H3C S5500-SI/EI documentation set

The H3C S5500-SI/EI documentation set includes:

Category Documents Purposes

Marketing brochures Describe product specifications and benefits.

Technology white papers

Provide an in-depth description of software

features and technologies.

PSR150-A [ PSR150-D ] Power

Modules User Manual

Describes the appearances, features,

specifications, installation, and removal of the

pluggable 150W power modules available for

the products.

RPS User Manual

Describes the appearances, features, and

specifications of the RPS units available for the

products.

RPS Ordering Information for

H3C Low-End Ethernet

Switches

Provides the RPS and switch compatibility matrix

and RPS cable specifications.

H3C Low End Series Ethernet

Switches Pluggable Modules

Manual

Describes the models, appearances, and

specifications of the pluggable modules

available for the products.

Product

description

and

specifications

Interface Card User Manual

Describes the appearance and specifications

of interface cards.

Quick Start

Provides regulatory information and the safety

instructions that must be followed during

installation.

Guides you through initial installation and setup

procedures to help you quickly set up and use

your device with the minimum configuration.

Installation Guide

Provides a complete guide to hardware

installation and hardware specifications.

Pluggable SFP[SFP+][XFP]

Transceiver Modules

Installation Guide

Guides you through installing SFP/SFP+/XFP

transceiver modules.

Hardware

installation

Interface Card User Manual Describes how to install an interface card.

Configuration guides

Describe software features and configuration

procedures.

Software

configuration

Command references

Provide a quick reference to all available

commands.

H3C Series Ethernet Switches

Login Password Recovery

Manual

Describes how to find or recover a lost

password.

Operations

and

maintenance

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

[email protected]

http://www.h3c.com

Documentation feedback

You can e-mail your comments about product documentation to [email protected].

We appreciate your comments.

i

Contents

Ethernet interface configuration ·································································································································· 1

Ethernet interface overview··············································································································································1

Ethernet interface naming conventions ··················································································································1

Configuring a Combo interface······························································································································1

Switchable link mode of Ethernet interfaces (available only on the S5500-EI) ·················································2

General Ethernet interface configuration························································································································2

Configuring basic settings of an Ethernet interface ······························································································2

Configuring the link mode of an Ethernet interface (available only on the S5500-EI) ·····································3

Configuring generic flow control on an Ethernet interface··················································································4

Configuring link change suppression on an Ethernet interface···········································································4

Configuring loopback testing on an Ethernet interface························································································6

Setting the statistics polling interval························································································································7

Enabling the auto power-down function on an Ethernet interface ······································································7

Configuring jumbo frame support ··························································································································7

Configuring a Layer 2 Ethernet interface ·······················································································································8

Layer 2 Ethernet interface configuration task list ··································································································8

Configuring a port group ········································································································································8

Configuring a MAC Address for an Ethernet Port (available only on the S5500-EI) ·······································9

Setting speed options for auto negotiation on an Ethernet interface··································································9

Configuring traffic storm protection····················································································································· 10

Enabling single-port loopback detection on an Ethernet interface··································································· 13

Enabling multi-port loopback detection··············································································································· 14

Setting the MDI mode of an Ethernet interface ·································································································· 15

Enabling bridging on an Ethernet interface········································································································ 16

Testing the cable connection of an Ethernet interface······················································································· 17

Configuring a Layer 3 Ethernet interface (available only on the S5500-EI)···························································· 17

Setting the MTU for an Ethernet interface··········································································································· 17

Displaying and maintaining an Ethernet interface ····································································································· 17

Loopback and null interface configuration···············································································································19

Loopback interface························································································································································· 19

Introduction to loopback interface······················································································································· 19

Configuring a loopback interface ······················································································································· 19

Null interface ·································································································································································· 20

Introduction to null interface································································································································· 20

Configuring null 0 interface ································································································································· 20

Displaying and maintaining loopback and null interfaces························································································ 21

MAC address table configuration·····························································································································22

Overview········································································································································································· 22

How a MAC address table entry is created······································································································· 22

Types of MAC address table entries ··················································································································· 23

MAC address table-based frame forwarding ···································································································· 23

Configuring the MAC address table···························································································································· 23

Manually configuring MAC address table entries····························································································· 24

Disabling MAC address learning························································································································ 24

Configuring the aging timer for dynamic MAC address entries ······································································ 26

Configuring the MAC learning limit on ports····································································································· 26

Displaying and maintaining MAC address tables ····································································································· 27

MAC address table configuration example ················································································································ 27

ii

MAC Information configuration ································································································································29

Overview········································································································································································· 29

Introduction to MAC Information ························································································································· 29

How MAC Information works ······························································································································ 29

Configuring MAC Information······································································································································ 29

Enabling MAC Information globally ··················································································································· 29

Enabling MAC Information on an interface ······································································································· 30

Configuring MAC Information mode ·················································································································· 30

Configuring the interval for sending Syslog or trap messages········································································· 30

Configuring the MAC Information queue length································································································ 30

MAC Information configuration example···················································································································· 31

Ethernet link aggregation configuration···················································································································32

Overview········································································································································································· 32

Basic concepts ······················································································································································· 32

Aggregating links in static mode ························································································································· 36

Aggregating links in dynamic mode ··················································································································· 37

Load sharing criteria for link aggregation groups····························································································· 39

Ethernet link aggregation configuration task list········································································································· 39

Configuring an aggregation group ····························································································································· 39

Configuration guidelines ······································································································································ 39

Configuring a static aggregation group············································································································· 40

Configuring a dynamic aggregation group ······································································································· 40

Configuring an aggregate interface ···························································································································· 41

Configuring the description of an aggregate interface····················································································· 42

Enabling link state traps for an aggregate interface ························································································· 42

Configuring a MAC address for an aggregate interface (available only on the S5500-SI) ························ 42

Shutting down an aggregate interface ··············································································································· 43

Configuring load sharing for link aggregation groups······························································································ 44

Configuring load sharing criteria for link aggregation groups········································································ 44

Enabling local-first load sharing for link aggregation······················································································· 45

Enabling link-aggregation traffic redirection··············································································································· 46

Displaying and maintaining Ethernet link aggregation ····························································································· 47

Ethernet link aggregation configuration examples····································································································· 47

Layer 2 static aggregation configuration example···························································································· 48

Layer 2 dynamic aggregation configuration example······················································································ 50

Layer 2 aggregation load sharing configuration example··············································································· 52

Port isolation configuration········································································································································55

Introduction to port isolation ········································································································································· 55

Configuring the isolation group···································································································································· 55

Displaying and maintaining isolation groups ············································································································· 56

Port isolation configuration example···························································································································· 56

MSTP configuration····················································································································································58

Introduction to STP ························································································································································· 58

Why STP································································································································································· 58

Protocol packets of STP········································································································································· 58

Basic concepts in STP············································································································································ 59

How STP works······················································································································································ 60

Introduction to RSTP ······················································································································································· 66

Introduction to MSTP······················································································································································ 66

Why MSTP ····························································································································································· 66

Basic concepts in MSTP········································································································································ 67

How MSTP works ·················································································································································· 71

Implementation of MSTP on devices···················································································································· 71

iii

Protocols and standards ······································································································································· 72

MSTP configuration task list ·········································································································································· 72

Configuring MSTP ·························································································································································· 73

Configuring an MST region ································································································································· 73

Configuring the root bridge or a secondary root bridge·················································································· 74

Configuring the work mode of an MSTP device································································································ 75

Configuring the priority of a device ···················································································································· 76

Configuring the maximum hops of an MST region ··························································································· 76

Configuring the network diameter of a switched network················································································ 77

Configuring timers of MSTP·································································································································· 77

Configuring the timeout factor ····························································································································· 78

Configuring the maximum port rate ···················································································································· 79

Configuring ports as edge ports·························································································································· 79

Configuring path costs of ports···························································································································· 80

Configuring port priority······································································································································· 82

Configuring the link type of ports ························································································································ 83

Configuring the mode a port uses to recognize/send MSTP packets ····························································· 84

Enabling the output of port state transition information ···················································································· 84

Enabling the MSTP feature ··································································································································· 85

Performing mCheck··············································································································································· 85

Configuring Digest Snooping······························································································································· 86

Configuring No Agreement Check······················································································································ 88

Configuring protection functions·························································································································· 90

Displaying and maintaining MSTP······························································································································· 93

MSTP configuration example········································································································································ 94

BPDU tunneling configuration ···································································································································99

Introduction to BPDU tunneling ····································································································································· 99

Background···························································································································································· 99

BPDU tunneling implementation·························································································································100

Configuring BPDU tunneling ·······································································································································101

Configuration prerequisites ································································································································101

Enabling BPDU tunneling····································································································································102

Configuring destination multicast MAC address for BPDUs ···········································································102

BPDU tunneling configuration examples····················································································································103

BPDU tunneling for STP configuration example ·······························································································103

BPDU tunneling for PVST configuration example·····························································································104

VLAN configuration ················································································································································ 106

Introduction to VLAN ···················································································································································106

VLAN overview····················································································································································106

VLAN fundamentals·············································································································································107

Types of VLAN·····················································································································································108

Configuring basic VLAN settings································································································································108

Configuring basic settings of a VLAN interface ·······································································································109

Port-based VLAN configuration ··································································································································110

Introduction to port-based VLAN ·······················································································································110

Assigning an access port to a VLAN ················································································································111

Assigning a trunk port to a VLAN······················································································································112

Assigning a hybrid port to a VLAN···················································································································113

Port-based VLAN configuration example··········································································································114

MAC-based VLAN configuration································································································································116

Introduction to MAC-based VLAN ·····················································································································116

Configuring MAC-based VLAN ·························································································································117

MAC-based VLAN configuration example ·······································································································120

iv

Protocol-based VLAN configuration ···························································································································123

Introduction to protocol-based VLAN ················································································································123

Configuring a protocol-based VLAN·················································································································123

Protocol-based VLAN configuration example···································································································125

IP Subnet-based VLAN configuration ·························································································································127

Introduction ··························································································································································127

Configuring an IP subnet-based VLAN··············································································································128

Displaying and maintaining VLAN ····························································································································129

Super VLAN configuration (available only on the S5500-EI)·············································································· 130

Overview·······································································································································································130

Configuring a super VLAN··········································································································································130

Displaying and maintaining super VLAN··················································································································132

Super VLAN configuration example ··························································································································132

Isolate-user-VLAN configuration ····························································································································· 135

Overview·······································································································································································135

Configuring isolate-user-VLAN····································································································································135

Configuring an isolate-user-VLAN······················································································································136

Configuring secondary VLANs ··························································································································137

Associating secondary VLANs with an isolate-user-VLAN ··············································································138

Displaying and maintaining isolate-user-VLAN·········································································································138

Isolate-user-VLAN configuration example ··················································································································138

Voice VLAN configuration······································································································································ 146

Overview·······································································································································································146

OUI addresses ·····················································································································································146

Voice VLAN assignment modes·························································································································147

Security mode and normal mode of voice VLANs···························································································149

Configuring a voice VLAN··········································································································································150

Configuration prerequisites ································································································································150

Configuring QoS priority settings for voice traffic on an interface································································151

Configuring a port to operate in automatic voice VLAN assignment mode ·················································151

Configuring a port to operate in manual voice VLAN assignment mode ·····················································152

Displaying and maintaining voice VLAN ··················································································································153

Voice VLAN configuration examples ·························································································································153

Automatic voice VLAN mode configuration example ·····················································································153

Manual voice VLAN assignment mode configuration example ·····································································155

GVRP configuration················································································································································· 158

Introduction to GVRP····················································································································································158

GARP ····································································································································································158

GVRP·····································································································································································161

Protocols and standards ·····································································································································162

GVRP configuration task list········································································································································162

Configuring GVRP functions········································································································································162

Configuring GARP timers ············································································································································163

Displaying and maintaining GVRP·····························································································································164

GVRP configuration examples ····································································································································165

GVRP normal registration mode configuration example·················································································165

GVRP fixed registration mode configuration example ····················································································166

GVRP forbidden registration mode configuration example············································································167

QinQ configuration················································································································································· 170

Introduction to QinQ····················································································································································170

Background and benefits····································································································································170

How QinQ works················································································································································170

v

QinQ frame structure ··········································································································································171

Implementations of QinQ ···································································································································172

Modifying the TPID in a VLAN tag····················································································································172

Protocols and standards ·····································································································································173

QinQ configuration task list········································································································································174

Configuring basic QinQ ·············································································································································174

Enabling basic QinQ··········································································································································174

Configuring VLAN transparent transmission ····································································································174

Configuring selective QinQ ········································································································································175

Configuring an outer VLAN tagging policy ·····································································································175

Configuring an inner-outer VLAN 802.1p priority mapping··········································································177

Configuring inner VLAN ID substitution (available only on the S5500-EI)····················································179

Configuring the TPID value in VLAN tags··················································································································180

Configuring the TPID value on the S5500-EI····································································································180

Configuring the TPID value on the S5500-SI····································································································180

QinQ configuration examples ····································································································································180

Basic QinQ configuration example···················································································································180

Port-based selective QinQ configuration example ··························································································183

QoS policy-based selective QinQ configuration exampl (available only on the S5500-EI)·······················185

VLAN mapping configuration (available only on the S5500-EI)········································································· 189

VLAN mapping overview ············································································································································189

Application scenario of one-to-one and many-to-one VLAN mapping ··························································189

Application scenario of two-to-two VLAN mapping ························································································190

Concepts and terms ············································································································································191

VLAN mapping implementations ·······················································································································192

Configuring VLAN mapping ·······································································································································194

Configuring one-to-one VLAN mapping············································································································194

Configuring many-to-one VLAN mapping·········································································································196

Configuring two-to-two VLAN mapping············································································································199

VLAN mapping configuration examples ···················································································································202

One-to-one and many-to-one VLAN mapping configuration example···························································202

Two-to-two VLAN mapping configuration example·························································································208

LLDP configuration··················································································································································· 211

Overview·······································································································································································211

Background··························································································································································211

Basic concepts ·····················································································································································211

How LLDP works ··················································································································································215

Protocols and standards ·····································································································································216

LLDP configuration task list ··········································································································································216

Performing basic LLDP configuration··························································································································217

Enabling LLDP ······················································································································································217

Setting the LLDP operating mode ·······················································································································217

Setting the LLDP re-initialization delay···············································································································218

Enabling LLDP polling··········································································································································218

Configuring the advertisable TLVs ·····················································································································218

Configuring the management address and its encoding format····································································219

Setting other LLDP parameters····························································································································220

Setting an encapsulation format for LLDPDUs···································································································221

Configuring CDP compatibility···································································································································221

Configuration prerequisites ································································································································222

Configuring CDP compatibility ··························································································································222

Configuring LLDP trapping ··········································································································································222

Displaying and maintaining LLDP·······························································································································223

vi

LLDP configuration examples ······································································································································223

Basic LLDP configuration example·····················································································································223

CDP-compatible LLDP configuration example···································································································226

Service loopback group configuration (available only on the S5500-EI)··························································· 228

Overview·······································································································································································228

Functions of service loopback groups···············································································································228

Service types of service loopback groups ········································································································228

Requirements on service loopback ports···········································································································228

States of service loopback ports ························································································································229

Configuring a service loopback group······················································································································230

Displaying and maintaining service loopback groups·····························································································230

Service loopback group configuration example·······································································································230

Index ········································································································································································ 232

1

Ethernet interface configuration

This chapter includes these sections:

•

Ethernet interface overview

•

General Ethernet interface configuration

•

Configuring a Layer 2 Ethernet interface

•

Configuring a Layer 3 Ethernet interface (available only on the S5500-EI)

•

Displaying and maintaining an Ethernet interface

Ethernet interface overview

Ethernet interface naming conventions

The GE and 10-GE interfaces on the S5500-SI&S5500-EI series Ethernet switches are named in the

format of interface-type A/B/C, where the following definitions apply:

• If the switch does not support Intelligent Resilient Framework (IRF), A takes 1. If the switch support IRF,

A represents the ID of the switch in an IRF virtual device. If the switch is not assigned to any IRF

virtual device, A takes 1.

• B represents a slot number on the switch. It takes 0 for fixed interfaces, 1 for interfaces on interface

expansion card 1, and 2 for interfaces on interface expansion card 2.

• C represents the number of an interface on a slot.

NOTE:

• For more information about the expansion cards, see the

H3C S5500-EI Series Ethernet Switches

Installation Guide

and the

H3C S5500-SI Series Ethernet Switches Installation Guide

.

• The GE ports of the GE interface expansion card are displayed as 10-GE ports on the switch

where the

expansion card is installed.

Configuring a Combo interface

Introduction to Combo interfaces

A Combo interface is a logical interface that comprises one optical (fiber) port and one electrical

(copper) port. The two ports share one forwarding interface and cannot work simultaneously. When you

enable the electrical port, the optical port is disabled automatically and vice versa.

The optical and electrical ports of a Combo interface are Layer 2 Ethernet interfaces and have their own

separate interface views, in which you can activate the optical or electrical port, and configure other port

attributes such as the interface rate and duplex mode.

Configuration prerequisites

Before you configure a Combo interface, complete the following tasks:

• Use the display port combo command to find out the Combo interfaces on your device and identify

the two physical interfaces that comprise each Combo interface.

2

• Use the display interface command to find out, of the two physical ports that comprise a Combo

interface, which is the optical port and which is the electrical port. If the output includes “Media

type is twisted pair, Port hardware type is 1000_BASE_T”, the current port is the electrical port; if the

output includes “Media type is not sure, Port hardware type is No connector”, the current port is the

optical port.

Changing the active port of a Combo interface

Follow these steps to change the active port of a double Combo interface:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view

interface interface-type

interface-number

—

Activate the current interface undo shutdown

Optional

By default, of the two ports that

comprise a Combo interface, the

one with a smaller port ID is active.

Switchable link mode of Ethernet interfaces (available only on

the S5500-EI)

You can switch the link mode of an Ethernet interface from Layer 2 (bridge) to Layer 3 (route) and vice

versa as needed. When operating in Layer 2 mode, the Ethernet interface acts as a Layer 2 interface.

When operating in Layer 3 mode, the Ethernet interface acts as a Layer 3 interface. For more information,

see “

Configuring the link mode of an Ethernet interface (available only on the S5500-EI).”

General Ethernet interface configuration

This section describes the attributes and configurations common to Layer 2 and Layer 3 Ethernet

interfaces. For more information about the attributes, see “

Configuring a Layer 2 Ethernet interface” and

“

Configuring a Layer 3 Ethernet interface (available only on the S5500-EI).”

Configuring basic settings of an Ethernet interface

You can set an Ethernet interface to operate in one of the following duplex modes:

• Full-duplex mode (full). Interfaces operating in this mode can send and receive packets

simultaneously.

• Half-duplex mode (half). Interfaces operating in this mode cannot send and receive simultaneously.

• Auto-negotiation mode (auto). Interfaces operating in this mode negotiate a duplex mode with their

peers.

Similarly, you can set the speed of an Ethernet interface or enable it to automatically negotiate a speed

with its peer. For a 100-Mbps or 1000-Mbps Layer 2 Ethernet interface, you can also set speed options

for auto negotiation. The two ends can pick a speed only from the available options. For more

information, see “

Setting speed options for auto negotiation on an Ethernet interface.”

Follow these steps to configure an Ethernet interface:

3

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view

interface interface-type

interface-number

—

Change the description of the

interface

description text

Optional

By default, the description of an

interface is the interface name

followed by the “Interface” string,

GigabitEthernet1/0/1 Interface for

example.

Set the duplex mode duplex { auto | full | half }

Optional

The optical port of an SFP port and the

electrical port of an Ethernet port

whose port rate is configured as

1000 Mbps do not support the half

keyword.

The default duplex mode of a port is

auto negotiation.

Set the interface speed speed { 10 | 100 | 1000 | auto }

Optional

The optical port of an SFP port does

not support the 10 and 100

keywords.

By default, the auto option is enabled.

Shut down the Ethernet interface shutdown

Optional

By default, an Ethernet interface is in

up state.

To bring up an Ethernet interface, use

the undo shutdown command.

Configuring the link mode of an Ethernet interface (available

only on the S5500-EI)

An Ethernet interface operates either in Layer 2 (bridge) or Layer 3 (route) mode. To meet networking

requirements, you can set the link mode of an Ethernet interface to bridge or route.

Follow these steps to change the link mode of an Ethernet interface:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view interface interface-type interface-number

—

Change the link mode of the Ethernet

interface

port link-mode { bridge | route }

Required

By default, Ethernet

interfaces operate in

bridge mode (as Layer 2

Ethernet interfaces).

4

CAUTION:

• After you change the link mode of an Ethernet interface, all the settings of the Ethernet interface are

restored to their defaults under the new link mode.

• If you set the link mode of the active port of a Combo interface to Layer 3, you cannot activate the other

port with the undo shutdown command. To chan

g

e the active port of the Combo interface, make sure

that the optical and electrical ports of the Combo interface operate in Layer 2 mode.

Configuring generic flow control on an Ethernet interface

An interface implements generic flow control by sending and receiving common pause frames. The

following generic flow control modes are available:

• TxRx mode enables an interface to both send and receive common pause frames.

• Rx mode enables an interface to receive but not send common pause frames.

In

Figure 1, when both Port A and Port B forward packets at 1000 Mbps, Port C is congested. To avoid

packet loss, enable flow control on Port A and Port B.

Figure 1 Flow control application scenario

Configure Port B to operate in TxRx mode, Port A in Rx mode.

• When congestion occurs on Port C, Switch B buffers frames. When the amount of buffered frames

exceeds a certain value, Switch B sends a common pause frame out of Port B to ask Port A to

suspend sending packets. This pause frame also tells Port A for how long it is expected to pause.

• Upon receiving the common pause frame from Port B, Port A suspends sending packets to Port B for

a period.

• If congestion persists, Port B keeps sending common pause frames to Port A until the congestion

condition is removed.

Follow these steps to configure flow control on an interface:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view

interface interface-type

interface-number

—

Enable TxRx mode flow control flow-control

Enable Rx mode flow control flow-control receive enable

Required

Use either command.

By default, flow control is disabled

on an Ethernet interface.

Configuring link change suppression on an Ethernet interface

An Ethernet interface has two physical link states: up and down. Each time the physical link of an

interface goes up or comes down, the physical layer reports the change to the upper layers, and the

upper layers handle the change, resulting in increased overhead.

5

To prevent physical link flapping from affecting system performance, configure link change suppression

to delay the reporting of physical link state changes. When the delay expires, the interface reports any

detected change.

Link change suppression does not suppress administrative up or down events. When you shut down or

bring up an interface with the shutdown or undo shutdown command, the interface reports the event to

the upper layers immediately.

On an S5500-SI&S5500-EI switch, you can configure link down suppression or link up suppression, but

not both.

Link down suppression enables an interface to suppress link down events and start a delay timer each

time the physical link goes down. During this delay, the interface does not report the link down event, and

the display interface brief or display interface command displays the interface state as UP. If the physical

link is still down when the timer expires, the interface reports the link down event to the upper layers.

Link up suppression enables an interface to suppress link up events and start a delay timer each time the

physical link goes up. During this delay, the interface does not report the link up event, and the display

interface brief or display interface command displays the interface state as DOWN. If the physical link

is still up when the timer expires, the interface reports the link up event to the upper layers.

Configuring link down suppression

Follow these steps to enable an Ethernet interface to suppress link down events:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view

interface interface-type

interface-number

—

Set a link down suppression

interval

link-delay delay-time

Required

Link down suppression is disabled by

default.

Configuring link up suppression

Follow these steps to configure link up suppression on an Ethernet interface:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view

interface interface-type

interface-number

—

Set a link up suppression interval link-delay delay-time mode up

Required

Link up suppression is disabled by

default.

NOTE:

The link-delay mode up command and the link-delay

command supersedes each other, and whichever is

configured last takes effect.

6

Configuring loopback testing on an Ethernet interface

You can perform loopback testing on an Ethernet interface to check whether the interface functions

properly. The Ethernet interface cannot forward data packets during the testing. Loopback testing falls

into the following categories:

• Internal loopback testing, which tests all on-chip functions related to Ethernet interfaces. As shown

in

Figure 2, internal loopback testing is performed on Port 1. During the internal loopback testing,

the interface sends out a certain number of test packets, which are looped back to the interface over

the self-loop created on the switching chip

Figure 2 Internal loopback testing

• External loopback testing, which tests the hardware of Ethernet interfaces. As shown in Figure 3,

external loopback testing is performed on Port 1. To perform external loopback testing on an

Ethernet interface, insert a loopback plug into the interface. During the external loopback testing,

the interface sends out a certain number of test packets, which are looped over the plug and back

to the interface. If the interface fails to receive any test packet, the hardware of the interface is faulty.

Figure 3 External loopback testing

Follow these steps to perform loopback testing on an Ethernet interface:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface or ONU

interface view

interface interface-type

interface-number

—

Perform loopback testing

loopback { external | internal } Required

NOTE:

• On an interface that is physically down, you can only perform internal loopback testing. On an interface

administratively shut down, you can perform neither internal nor external loopback testing.

• The speed, duplex, mdi, and shutdown commands are unavailable during loopback testing.

• During loopback testing, an Ethernet interface works in full duplex mode. When you disable loopback

testing, the original duplex setting of the interface restores.

7

Setting the statistics polling interval

Follow these steps to set the statistics polling interval on an Ethernet interface:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view

interface interface-type

interface-number

—

Set the statistics polling interval on

the Ethernet interface

flow-interval interval

Optional

The default interface statistics

polling interval is 300 seconds.

To display the interface statistics collected in the last polling interval, use the display interface command.

To clear interface statistics, use the reset counters interface command.

Enabling the auto power-down function on an Ethernet

interface

To save power, enable the auto power-down function on Ethernet interfaces. An interface enters the

power save mode if it has not received any packet for a certain period of time (this interval depends on

the specifications of the chip, and is not configurable). When a packet arrives later, the interface enters

its normal state.

Follow these steps to enable auto power-down on an Ethernet interface:

To do… Use the command… Remarks

Enter system view system-view —

Enter Ethernet interface view

interface interface-type

interface-number

—

Enable auto power-down on an

Ethernet interface

port auto-power-down

Required

Disabled by default.

Configuring jumbo frame support

Ethernet frames longer than the standard Ethernet frame size (1536 bytes) are called "jumbo frames",

which are typical of file transfer.

• If you set an Ethernet interface to accept jumbo frames, it allows frames up to 9216 bytes to

pass through.

• If you disable an Ethernet interface to accept jumbo frames, it allows frames up to 1536 bytes to

pass through.

Follow these steps to configure jumbo frame support in Layer 3 Ethernet interface view:

To do… Use the command… Remarks

Enter system view system-view —

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H3C S5500-EI Series Configuration manual

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