HP SuperStack 3 Load Balancer Appliance User Manual

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SuperStack® 3

Server Load Balancer Server Load Balancer Plus

User Guide

3C16120 3C16121

http://www.3com.com/

Part No. 990-0049-00 Published June 2001

3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145

Copyright © 2001, 3Com Technologies. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Technologies.

3Com Technologies reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Technologies to provide notification of such revision or change.

3Com Technologies provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included in the hard copy documentation.

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If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this User Guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com, and SuperStack are registered trademarks of 3Com Corporation. The 3Com logo is a trademark of 3Com Corporation.

Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of Novell, Inc. Netscape Navigator is a registered trademark of Netscape Communications. Javascript is a trademark of Sun Microsystems.

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Establishing environmental performance standards that comply with national legislation and regulations. Conserving energy, materials and natural resources in all operations. Reducing the waste generated by all operations. Ensuring that all waste conforms to recognized environmental

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CONTENTS

ABOUT THIS GUIDE

Conventions 8 Related Documentation 9 Product Registration 9 Documentation Comments 9

1 INTRODUCING THE SERVER LOAD BALANCER

About the Server Load Balancer 12

Summary of Hardware Features 12 Summary of Software Features 12

Server Load Balancer — Front View Detail 13

Ports 13 Console Port 13 LEDs 14

Server Load Balancer — Rear View Detail 15

Unit Information Label 15 Power Socket 15 Advanced Redundant Power System Socket 15

Downloading 3Com Network Supervisor 16

2 INSTALLING THE SERVER LOAD BALANCER

Package Contents 18 Choosing a Suitable Site 18 Rack-mounting 19 Choosing the Correct Cables 20 Placing Units On Top of Each Other 20 The Power-up Sequence 21

Powering-up 21

Solving Problems Indicated by LEDs 22

3 SETTING UP FOR MANAGEMENT

Methods of Managing the Server Load Balancer 24 Assigning an IP Address 24

4 WORKING WITH THE WEB INTERFACE

Choosing a Browser 28

Installing the JRE for Microsoft Internet Explorer 28 Installing the JRE for Netscape Navigator 29

Accessing the Web Interface 30

Exiting the Web interface 30

Using the Web Interface 31

Summary View 32 Device View 33 Logical View 35 Help View 37

Setting up SNMP Management 38

Specifying Community Strings 38 Modifying a Trap Address 38

Upgrading Operating Software 39

5 CONFIGURING NON-REDUNDANT SERVER LOAD BALANCING

Server Load Balancing Configuration Example 42 Configuring for Non-redundant Server Load Balancing 43

6 CONFIGURING REDUNDANT SERVER LOAD BALANCING

Redundant Server Load Balancing Configuration Example 46 Configuring for Active-Passive Redundancy 47 Configuring for Active-Active Redundancy 49

Active-Active Device Allocation 51

Setting Redundancy Settings 51

7 CONFIGURING CACHE REDIRECTION

Cache Redirection Configuration Example 54 Defining a Cache Subnet 55

Non-redundant Configuration 55

Redundant Configuration 56 Adding a Cache 57 Assigning Caches to Services 57

Showing Status and Deleting the Cache 58 Creating a Cache Profile (Optional) 58

8 CONFIGURING FOR LOAD BALANCING

Defining a Server Subnet 62 Changing Lan Port Roles 63 Adding a Server 64 Adding a Service 65 Assigning Servers to Service 66

Showing Status and Deleting the Server 66

Assigning Server to Services (Advanced) 67 Adding a User Group 68

Adding IP Address Ranges to User Groups 68

Accessing Permissions 69 Creating a Balance Profile (Optional) 69 Modifying Security Filters (Attack Mitigation) 72

Modifying Security Filters 72

Modifying User Access 73

A SAFETY INFORMATION

Important Safety Information 76 L’information de Sécurité Importante 78 Wichtige Sicherheitsinformationen 80

B TECHNICAL SPECIFICATIONS AND PIN-OUTS

Server Load Balancer Specifications 83 Console Port Cable 84 PC-AT Serial 84

C TECHNICAL SUPPORT

Online Technical Services 85

World Wide Web Site 85

3Com Knowledgebase Web Services 85

3Com FTP Site 86 Support from Your Network Supplier 86 Support from 3Com 87 Returning Products for Repair 89

INDEX

3COM CORPORATION LIFETIME LIMITED WARRANTY

REGULATORY NOTICES

ABOUT THIS GUIDE

This guide provides all the information you need to install and use a SuperStack Server Load Balancer Plus (3C16121) to perform server load balancing, both non-redundant and redundant, and cache redirection.

The guide is intended for use by network administrators who are responsible for installing and setting up network equipment.

Most user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) or HTML on the 3Com® World Wide Web site:

http://www.3com.com/

3 Server Load Balancer (3C16120) or the SuperStack 3

8 ABOUT THIS GUIDE

Conventions Table 1 and Table 2 list conventions that are used throughout this guide.

Ta b le 1 Notice Icons

Icon Notice Type Description

Information note Information that describes important features or

instructions.

Caution Information that alerts you to potential loss of data or

Warning Information that alerts you to potential personal

Ta b le 2 Text Conventions

Convention Description

boldface

Screen displays This typeface represents information as it appears on the

Syntax The word “syntax” means that you must evaluate the syntax

The words “enter” and “type”

Keyboard key names If you must press two or more keys simultaneously, the key

Words in italics Italics are used to:

potential damage to an application, system, or device.

injury.

This typeface represents user input. Example:

At the login: prompt, enter

admin.

screen.

provided and then supply the appropriate values for the placeholders that appear in angle brackets. Example:

To change your password, use the following syntax:

system password <password>

In this example, you must supply a password for <password>. When you see the word “enter” in this guide, you must type

something, and then press Return or Enter. Do not press Return or Enter when an instruction simply says “type.”

names are linked with a plus sign (+). Example:

Press Ctrl+Alt+Del

■ Emphasize a point.

■ Denote a new term at the place where it is defined in the

text.

■ Identify menu names, menu commands, and software

button names. Examples: From the Help menu, select Contents.

Click OK.

Product Registration

Documentation Comments

In addition to this guide, the documentation set includes the following:

■ Release Notes (PDF format)

These notes provide information about the current software release, including new features, modifications, and known problems. These release notes are available in PDF format and are accessible from the 3Com web site.

There are other publications you may find useful, such as:

■ Documentation accompanying the Advanced Redundant Power

System.

■ Documentation accompanying the 3Com® Network Supervisor.

You can register your SuperStack 3 Server Load Balancer on the 3Com Web site to receive up-to-date information on your product:

http://support.3com.com/registration/frontpg.pl

Your suggestions are very important to us. They will help make our documentation more useful to you. Please e-mail comments about this document to 3Com at:

pddtechpubs_comments@3com.com

Please include the following information when commenting:

■ Document title

■ Document part number (on the title page)

■ Page number (if appropriate)

Example:

■ SuperStack 3 Server Load Balancer and Server Load Balancer Plus User

Guide

■ Part Number 990-XXXX-XX

■ Page 21

10 ABOUT THIS GUIDE

INTRODUCING THE SERVER LOAD BALANCER

This chapter contains introductory information about the SuperStack® 3 Server Load Balancer and the SuperStack 3 Server Load Balancer Plus. It covers summaries of the following topics:

■ About the Server Load Balancer

■ Server Load Balancer — Front View Detail

■ Server Load Balancer — Rear View Detail

■ Downloading 3Com Network Supervisor

Unless otherwise noted, the information in this chapter applies to both the Server Load Balancer and the Server Load Balancer Plus.

12 CHAPTER 1: INTRODUCING THE SERVER LOAD BALANCER

About the Server Load Balancer

Summary of

Hardware Features

Summary of Software

Features

The SuperStack® 3 Server Load Balancer and Server Load Balancer Plus provide support for connecting multiple high-performance servers to a Gigabit backbone and providing server load balancing, cache redirection and security functionality.

Table 3 summarizes the hardware features that are supported in both models of the Server Load Balancer.

Ta b le 3 Hardware Features

Server Load Balancer

Feature

Server Load Balancer Plus

Memory ■ 64 MB for Server Load Balancer Plus

■ 32 MB for Server Load Balancer

12 10/100 LAN Ports Supported 2 Gigabit Ethernet Ports Supported

SuperStack 3 Architecture ■ Connects to a SuperStack 3 Advanced

Redundant Power System (ARPS)

■ Installs in a 19-inch rack or stand-alone

mounting

Table 4 summarizes the software features that are supported in both models of the Server Load Balancer.

Ta b le 4 Software Features

Server Load Balancer

Feature

Server Load Balancer Plus

Algorithms ■ Round Robin

■ Weighted Round Robin

■ Least Connections

■ Quickest Last Response

■ Quickest Average Response

■ Weighted Percentage

Port Trunking (Etherchannel) Supported

Up to 256 servers Supported TCP/IP Sessions ■ 16,000 for the Server Load Balancer

■ 128,000 for the Server Load Balancer Plus

Persistence Modes ■ Source IP

■ Secure Socket Layer (SSL) Session ID

■ Cookie

Server Load Balancer — Front View Detail 13

Ta b le 4 Software Features

Server Load Balancer

Feature

Server Load Balancer Plus

Cache Redirection ■ Transparent mode

■ Proxy mode

DoS Protection Supported

Redundant Failover Modes ■ Primary/Secondary

■ Active/Active

Management Web interface, command line interface, and

SNMP supported

Server Load Balancer — Front View Detail

10BASE-T/100BASE-TX Ports

Ports The Server Load Balancer and Server Load Balancer Plus have twelve

Console Port The console port allows you to use a terminal or serial PC connector to

Figure 1 Server Load Balancer — front view

1413 1413

Power Self-Test LED Power LED

1000BASE-SX

1000BASE-SX Ports

Console Port

1 2 3 4 5 6 7 8 9 121110 1 2 3 4 5 6 7 8 9 121110

10BASE-T/100BASE-TX

Port Status LEDs

dedicated 10BASE-T/100BASE-TX ports and two 1000BASE-SX ports.

access the command line interface (CLI). The CLI allows you to assign the IP address to the Service Load Balancer and provides basic configuration capabilities. For console port pin-out information, see Appendix B.

14 CHAPTER 1: INTRODUCING THE SERVER LOAD BALANCER

LEDs Table 5 lists LEDs visible on the front of the Server Load Balancer, and how

to read their status according to color.

Ta b le 5 LED Behavior

LED Color Indicates

Power/Self Test LED

Yel low The Server Load Balancer has failed its Power On Self

Yellow flashing The Server Load Balancer is running POST.

Off No fault has been detected.

Power LED

Green The Server Load Balancer is receiving power. Green flashing The Server Load Balancer is receiving power and

Off The Server Load Balancer is not receiving power.

10/100BASE-T Port Status LEDs

Packet Yel low Packets are being transmitted/received on the port.

Off No packets are being transmitted/received on the port.

Status Green A link is present and the port is enabled.

Green flashing The port is disabled.

Off No link is present.

1000BASE-SX Port Status LEDs

Packet Yel low Packets are being transmitted/received on the port.

Off No packets are being transmitted/received on the port.

Status Green A high speed (1000 Mbps) link is present, and the port

Green flashing A high speed (1000 Mbps) port is disabled. Off No link is present.

Test (POST) or a failure is detected in the runtime.

downloading new operating software.

is enabled.

Server Load Balancer — Rear View Detail 15

Server Load Balancer — Rear View Detail

Unit Information Label

Power Socket

Unit Information

Label

Figure 2 Server Load Balancer — rear view

Laser warning and

Supply warning Label

Redundant Power System Socket

The labels on the rear of the unit show the following:

■ The 3Com product name of the Server Load Balancer

■ The 3Com 3C number of the Server Load Balancer

■ The unique MAC address (Ethernet address) of the Server Load

Balancer

■ The serial number of the Server Load Balancer

Power Socket The Server Load Balancer automatically adjusts its power setting to any

Advanced Redundant Power System Socket

You may need this information for fault reporting purposes.

supply voltage in the range 90-240 VAC.

To protect against internal power supply failure, you can use this socket to connect a Advanced Redundant Power System (ARPS) (part number 3C16075) to the Server Load Balancer. For more information on the Advanced Redundant Power System, see the documentation shipped with the power system.

For normal redundancy, the unit requires one Type 3 Power Module (part number 3C16075).

For full redundancy, the unit requires two Type 3 Power Modules combined using a Type 3 Y-Cable (part number 3C16077).

16 CHAPTER 1: INTRODUCING THE SERVER LOAD BALANCER

CAUTION: The Server Load Balancer can only use a SuperStack Advanced Redundant Power System output.

WARNING: If you are connecting the Server Load Balancer to a ARPS Type 3 Power Module, read the Safety Information section in the documentation shipped with the power system.

CAUTION: The Server Load Balancer has no ON/OFF switch; the only method of connecting or disconnecting main power is by connecting or disconnecting the power cord.

Downloading 3Com Network Supervisor

You can download 3Com Network Supervisor Version 3.0 from the following Web address:

http://www.3com.com/tns

Network Supervisor is a powerful, intuitive network management application for small to medium enterprise networks.

Network Supervisor automatically discovers up to 1500 network devices and shows devices and connections on a graphical display. Network managers can view network activity, monitor stress and set thresholds and alerts. This information helps to provide the most efficient, cost-effective use of network resources.

Version 3.0 adds significant extra functionality designed to detect network inefficiency and optimize network performance. Features include support for related and recurring events, user definable reports, auto-alerting using pager or SMS messages and simple updates from the 3Com Web site.

3Com Network Supervisor offers Telnet and Web device management.

INSTALLING THE SERVER LOAD BALANCER

This chapter contains the information you need to install and set up the Server Load Balancer. It covers the following topics:

■ Package Contents

■ Choosing a Suitable Site

■ Rack-mounting

■ Placing Units On Top of Each Other

■ The Power-up Sequence

■ Solving Problems Indicated by LEDs

WARNING: Safety Information. Before installing or removing any components from the Server Load Balancer or carrying out any maintenance procedures, you must read the safety information provided in Appendix A of this guide.

AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever tout composant du Server Load Balancer ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans l'Appendice A de ce guide.

WARNHINWEIS: Sicherheitsinformationen. Bevor Sie Komponenten aus dem Server Load Balancer entfernen oder dem Server Load Balancer hinzufuegen oder Instandhaltungsarbeiten verrichten, lesen Sie die Sicherheitsanweisungen, die in Appendix A (Anhang A) in diesem Handbuch aufgefuehrt sind.

18 CHAPTER 2: INSTALLING THE SERVER LOAD BALANCER

Package Contents Your shipping container should contain the following items:

■ Server Load Balancer (3C11620)

or Server Load Balancer Plus (3C11621)

■ User Guide (this guide)

■ Power Cord

■ 2 x mounting brackets

■ 6 x screws

■ 4 x rubber feet

Choosing a Suitable Site

The Server Load Balancer is suited for use where it can be mounted in a standard 19-inch equipment rack, or free-standing. A rack-mounting kit, containing two mounting brackets and six screws is supplied with the unit.

CAUTION: Ensure that the ventilation holes are not obstructed.

When deciding where to position the Server Load Balancer, ensure that:

■ Cabling is located away from sources of electrical noise such as radios,

transmitters and broadband amplifiers.

■ Cabling is located away from power lines and fluorescent lighting

fixtures

■ The Server Load Balancer is accessible and cables can be connected

easily.

■ Water or moisture cannot enter the case of the Server Load Balancer.

■ Air-flow is not restricted around the Server Load Balancer or through

the vents in the side of the Server Load Balancer. 3Com recommends

that you provide a minimum of 25 mm (1 in.) clearance.

■ The air is as free from dust as possible.

■ No more than four Server Load Balancer units are placed on top of

one another, if the units are free-standing.

■ Temperature operating limits are not exceeded. It is recommended

that the unit is installed in a clean, air conditioned environment.

■ Ensure there is adequate clearance at the front of the unit to ensure

that the fibers are not damaged as they have a restricted bend radius.

Rack-mounting 19

Rack-mounting The Server Load Balancer is 1.5U and fits in most standard 19-inch racks.

However, if you are connecting the Server Load Balancer to a ARPS Type 3 power module, a runner, shelf or tray is recommended to support the additional weight. You will need to allow a 2U space within the rack for each Server Load Balancer.

WARNING: The rack-mount kits alone are not sufficient to support the weight of the Server Load Balancer when attached to an ARPS power module. It is recommended that you use a runner, shelf or tray to support the total weight. The rack mount kits must not be used to suspend the Server Load Balancer from under a table or desk, or attach it to a wall.

CAUTION: You must use a full depth shelf or support that will not obstruct the air flow through the side panels of the Server Load Balancer.

CAUTION: Disconnect all cables from the Server Load Balancer before continuing. Remove all self adhesive pads from the underside of the Server Load Balancer if they have been fitted.

To rack-mount your Server Load Balancer:

1 Place the unit the right way up on a hard flat surface, with the front

facing towards you.

2 Locate a mounting bracket over the mounting holes on one side of the

unit, as shown in Figure 3.

Figure 3 Fitting a bracket for rack-mounting

20 CHAPTER 2: INSTALLING THE SERVER LOAD BALANCER

You must use the screws supplied with the mounting brackets. Damage caused to the unit by using incorrect screws invalidates your warranty.

3 Insert the three screws and tighten with a suitable screwdriver.

4 Repeat steps 2 and 3 for the other side of the unit.

5 Insert the unit into the 19-inch rack and secure with suitable screws (not

provided). Ensure that ventilation holes are not obstructed.

6 Connect network cabling.

Choosing the Correct Cables

Placing Units On Top of Each Other

The 1000BASE-FX fiber optic LAN ports (Ports 13 and 14) on the Server Load Balancer use SC connectors. The 10BASE-T/100BASE-TX copper LAN ports (Ports 1 through 12) use RJ45 connectors.

Table 6 explains cables to use before connecting a device to the copper ports.

Ta b le 6 Cabling for Copper Ports

Device to Connect: Use this Cable:

Another Server Load Balancer, a network switch or router

End Station (such as a server or a PC)

Cables are not supplied by 3Com.

Crossover cable

Straight-through cable

If the units are free-standing, up to four units can be placed one on top of the other.

If you are placing units one on top of the other, you must use the self-adhesive rubber feet supplied. Apply the feet to the underside of each unit, sticking one in the marked area at each corner. Place the units on top of each other, ensuring that the feet of the upper unit line up with the recesses of the lower unit.

The Power-up Sequence 21

The Power-up Sequence

Powering-up To power-up the Server Load Balancer, complete the following steps:

The following sections describe how to get your Server Load Balancer powered-up and ready for operation.

WARNING: If you are connecting the Server Load Balancer to a ARPS Type 3 Power Module, read the Safety Information section in the documentation shipped with the power system.

1 Plug the power cord into the power socket at the rear of the unit.

2 Plug the other end of the power cord into your power outlet.

The unit powers-up and runs through its Power On Self Test (POST), which takes approximately 10 seconds.

During the POST, all ports on the Server Load Balancer are disabled and the LEDs light in a rapid sequence. See “LEDs” on page 14.

When the POST has completed, check the Power/Self Test LED to make sure that your Server Load Balancer is operating correctly. See “Solving Problems Indicated by LEDs” on page 22.

22 CHAPTER 2: INSTALLING THE SERVER LOAD BALANCER

Solving Problems Indicated by LEDs

Table 7 contains a list of problems and suggested solutions if the LEDs indicate a problem. For Technical Support information, see Appendix C.

Ta b le 7 Problems Indicated by LEDs

Problem Suggested Solution

The Power LED does not light

On powering-up, the Power/Self Test LED lights yellow

A link is connected and yet the Status LED for the port does not light

Check that the power cable is firmly connected to the relevant unit and to the supply outlet. If the connection is secure and there is still no power, you may have a faulty power cord.

The relevant unit has failed its Power On Self Test (POST) because of an internal problem. Contact your supplier for advice.

Check that:

■ All connections are secure.

■ The devices at both ends of the link are powered-up.

■ The devices at both ends of the link have the same

auto-negotiation setting, i.e. both enabled, or both disabled.

■ The quality of cable is satisfactory.

■ The correct type of cable (crossover or

straight-through) is used.

SETTING UP FOR MANAGEMENT

This chapter explains the management methods used for managing a Server Load Balancer, and details the steps required before you can configure a Server Load Balancer to suit the needs of your network. It covers the following topics:

■ Methods of Managing the Server Load Balancer

■ Assigning an IP Address

24 CHAPTER 3: SETTING UP FOR MANAGEMENT

Methods of Managing the Server Load Balancer

Assigning an IP Address

You can manage a Server Load Balancer using one of the following methods:

■ Web interface management — Each Server Load Balancer has a set of

internal Web pages that allow you to manage the Server Load

Balancer using a Web browser. Using the Web interface is the

preferred method of management.

■ Command line interface management — The Server Load Balancer

offers limited command line interface (CLI) commands to configure

basic parameters, such as the management IP Address.

■ SNMP management — You can manage a Server Load Balancer using

any Network Manager running the Simple Network Management

Protocol (SNMP), such as 3Com Network Supervisor software. SNMP

management is limited and does not allow for full configuration

functionality.

To manage a Server Load Balancer over the network, the Server Load Balancer must be initially configured with the following:

■ An IP address and subnet mask

■ A default route

The CLI provides a series of online instructions that you need to complete the setup process.

To assign an IP address to the Server Load Balancer, complete the following steps:

1 Connect your management station to the console port on the front the

Server Load Balancer. See “Console Port Cable” on page 84.

2 On a Windows® PC, you may use the Hyperterminal program or other

terminal emulator. The correct settings are:

■ Bits per second: 9600

■ Data bits: 8

■ Parity: None

■ Stop bits: 1

■ Flow control: Hardware

Assigning an IP Address 25

3 Hit <Return>. At the login: prompt, enter admin.

The Server Load Balancer provides two levels of access, admin and monitor. The password field contains

blank default login passwords. The

two levels of access are:

■ admin — the user can access and change all manageable

parameters

■ monitor — the user can view all manageable parameters, but

cannot change any parameters

4 At the password: prompt, hit <Return>. The password field contains

a blank default login password. The Welcome to the SLB Setup CLI appears.

CAUTION: The Server Load Balancer does not provide a way to recover a lost password. If you choose to assign a new password, it is suggested you keep note of it in a safe place. If you forget your password, you will be locked out of the unit. If you change the password during the CLI Server Load Balancer setup, this is the password you should use, and not the blank default login password. For Technical Support, see Appendix C.

Welcome to the SLB Setup

Follow the on-screen instructions to complete the setup process.

You may run setup later by typing “setup” at the SEC> prompt. Setup will take you through the following steps: SEC>

1. Set unit ip address

2. Set default route

3. Set clock

4. Set login password

You may use <CR> to skip a step. Enter unit ip in this format: nnn.nnn.nnn.nnn/pp where: nnn.nnn.nnn.nnn is IP address

pp is address prefix

26 CHAPTER 3: SETTING UP FOR MANAGEMENT

5 You are prompted to enter the following information:

a a unit IP address

b a default route

c the local time

d the local date

e the number of desired time zone (1-107 options)

f a new login password

g confirm new login password

6 Once you have completed the setup, exit the CLI.

You are now ready to access the Server Load Balancer Web interface. See “Accessing the Web Interface”on page 30.

WORKING WITH THE WEB INTERFACE

This chapter describes how to access and use the web interface. It covers the following topics:

■ Choosing a Browser

■ Accessing the Web Interface

■ Using the Web Interface

■ Setting up SNMP Management

■ Upgrading Operating Software

28 CHAPTER 4: WORKING WITH THE WEB INTERFACE

Choosing a Browser To display the Web interface correctly, use one of the following Web

browsers:

■ Netscape Navigator® version 4.5 or above.

■ Microsoft® Internet Explorer version 5.0 or above.

For the browser to operate the Web interface correctly, the Java Runtime Environment (JRE) V1.3.0_02 or higher must be installed on your management workstation.

A version of the JRE plug-in for Windows® is provided on the Server Load Balancer. If you do not already have the plug-in installed on your management station, you will be prompted to install it. See either “Installing the JRE for Microsoft Internet Explorer” or “Installing the JRE for Netscape Navigator”.

Installing the JRE for

Microsoft Internet

Explorer

If you are using Microsoft Internet Explorer for your browser and do not have the Java Runtime Environment installed on your management station, the Security Warning window appears. Click Yes and follow the on-line instructions.

Figure 4 Security Warning Window

Choosing a Browser 29

Installing the JRE for

Netscape Navigator

If you are using Netscape Navigator for your browser and do not have the Java Runtime Environment installed on your management station, the Web Interface pages appears.

Figure 5 Web Interface - Netscape

To install the plug-in, complete the following steps:

1 Click on Click here to get the plug-in.

2 The Plug-in Not Loaded window appears. Click Get the plug-in. The

Plug-in Install for Netscape page appears.

3 Click Download Plug-in.The Save As window appears.

4 Save the file to your Desktop.

5 From your desktop, double-click on jre1_3_0.exe.

The Java Runtime Environment is now installed.

30 CHAPTER 4: WORKING WITH THE WEB INTERFACE

Accessing the Web Interface

To access the Web interface over the network, complete the following steps:

1 Ensure that your network is correctly set up for management using the

Web interface and open your Web browser.

2 In the Location field of the browser, enter the URL of the Server Load

Balancer. This must be in the format:

http://nnn.nnn.nnn.nnn/

where nnn.nnn.nnn.nnn is the IP address you assigned in “Assigning an IP Address” on page 24.

When the browser has located the Server Load Balancer, the Enter Network Password window appears.

3 Enter admin in the User Name field.

The Server Load Balancer provides two levels of access, admin and monitor. The password field contains a

blank default login password. The

two levels of access are:

■ admin — the user can access and change all manageable

parameters

■ monitor — the user can view all manageable parameters, but

cannot change any parameters

4 The password field contains a blank default login password. Hit

<Return>.

Exiting the Web

interface

The main Web interface is displayed. See “Using the Web Interface” on page 31.

You can exit the Web interface at any time; to do this, close your Web browser. For security reasons, you should always close your Web browser after a management session.

Using the Web Interface 31

Using the Web Interface

The Web interface is made up of three areas:

■ The Banner

This is always displayed at the top of the browser window. It displays the name of the current Server Load Balancer, and contains several external links that allow you to access information outside of the Web interface.

■ The Navigation Tree

This is always displayed down the left side of the browser window. It contains management folders that display dialog boxes in the information area.

■ The Information Area

This is always displayed in the center of the browser window. It contains the various dialog boxes that allow you to manage the Server Load Balancer.

Figure 6 Parts of the main Web interface

Banner

Navigation Tree

Information Area

32 CHAPTER 4: WORKING WITH THE WEB INTERFACE

Summary View The Summary View displays the latest information for the Server Load

Balancer.

The Summary View only displays information for the Server Load Balancer. You cannot perform any operations from this view. You must use the Device View and the Logical View to perform operations.

Figure 7 Summary View

The summary information is displayed in a two tables:

■ System Summary

The first table is entitled System Summary and displays the System

Name, Location, Contact and Up Time.

■ Device Summary

The second table is entitled Device Summary and displays the

hardware type, software version, and serial number for the Server

Load Balancer.

Using the Web Interface 33

Device View The Device View contains a mimic of the Server Load Balancer. The device

mimic is an interactive representation of the Server Load Balancer. It is periodically updated to reflect changes, particularly changes made to the status of its ports. This view is used to configure fundamental system and port operating parameters. To configure server load balancing, cache redirection and other features, use the Logical View.

While the Device View allows you to configure using the graphical user interface, there are some features that can only be configured from the Navigation Tree.

You can setup the Server Load Balancer by two methods; through the Navigation Tree or by clicking on the following device mimic "hotspots":

■ Port Hotspots

Each port on the mimic, including the console port, is a "hotspot". Click a port to open a pop-up menu that contains operations which you can launch for that particular port.

■ Unit Hotspot

The non-port area of the mimic is a "hotspot". Click anywhere on this area to open a pop-up menu that contains operations which you can launch for the Server Load Balancer as a whole.

34 CHAPTER 4: WORKING WITH THE WEB INTERFACE

Figure 8 Device View

Control Buttons

Navigation

Tr ee

Port

Pop-up Menu

Unit

Pop-up Menu

Control Buttons

Beneath the device mimic are three control buttons that you can use to control the mimic and its appearance and to provide help information:

■ Polling Interval — Click to set the rate at which the device mimic is

refreshed.

■ Poll Now — Click to refresh the mimic now.

■ Color Key — Click for an explanation of the symbols and colors on the

mimic's ports. Table 8 describes the colors and their actions.

Ta b le 8 Color Key Codes

Color Action

Green Enabled, connected

Black Enabled, disconnected Gray (with connection) Disabled, connected

Gray (without connection) Disabled, disconnected

Using the Web Interface 35

Logical View The Logical View presents a graphical view of the Server Load Balancer

configuration. This view is used to configure and monitor server load balancing, cache redirection and other high level device features. There are four blocks, each representing an area of configuration. Once configured, the entities will be listed in each block, and the approximate flow of data requests is indicated by the arrows.

You can configure the Server Load Balancer by two methods; through the Navigation Tree or by clicking on the top half of the block. Each colored portion of the block has a "hotspot". Click on a the block to open a pop-up menu that contains operations you can use to configure the Server Load Balancer.

While the Logical View allows you to configure using the graphical user interface, there are some features that can only be configured from the Navigation Tree.

Figure 9 Logical View

Navigation

Tr ee

Block

Pop-Up Menu

Buttons

36 CHAPTER 4: WORKING WITH THE WEB INTERFACE

In addition to the blocks, there are three buttons that can be used to assign permissions, and server and cache assignments. Table 9 describes the buttons and their actions.

Ta b le 9 Buttons and their actions

Button Action

Permissions Displays a matrix of user groups versus virtual services

Server Assignments Displays a matrix of virtual services versus physical servers. This

Cache Assignments Displays a matrix of cache servers. This display shows which

displaying access rights of deny or allow.

display shows which servers are used for each virtual service and the operational status of the mappings.

cache server are used for each virtual service and the operational status of the mappings.

Using the Web Interface 37

Help View The Help view contains important information on Web Browser and PC

platform combinations that are recommended when accessing the Web interface. The Help view also supplies minimal online user documentation.

If your management workstation has access to the World Wide Web,

clicking these links displays information from the 3Com Web site in a second browser window.

Figure 10 Help View

38 CHAPTER 4: WORKING WITH THE WEB INTERFACE

Setting up SNMP Management

Specifying

Community Strings

Modifying a Trap

Address

You can manage a Server Load Balancer using any Network Manager running the Simple Network Management Protocol (SNMP), such as 3Com Network Supervisor software.

You can specify SNMP community strings for the users defined on the Server Load Balancer.

To specify the community strings, complete the following steps:

1 Click Device View on the Toolbar.

2 Select System > Management > Community Strings in the Navigation

Tree. The Community Strings window is displayed.

3 The Get Access Community String field is defaulted to public.

4 Select Set Access Enabled check box. This enables the access to the Server

Load Balancer. The Set Access Community String is defaulted to private.

5 Click OK.

You can modify a trap address and its community string. The Server Load Balancer supports the following traps:

■ Cold Start ■ Spanning Tree newRoot

■ Authentication Failure ■ Spanning Tree topologyChange

■ Link Up/Down ■ RMON Event

To modify a trap address, complete the following steps:

1 Click Device View on the Toolbar.

2 Select System > Management > Trap Address in the Navigation Tree. The

Modify Trap Address page appears. This page lists the ID, IP Address and the Community String.

3 Click on 2. The line becomes highlighted.

4 Click Modify. The Trap Address window appears.

5 The Trap Community String field is defaulted to public. 6 Enter 1.1.1.1 in the Trap IP Address field. The IP address you enter

should be the destination for this trap.

7 Click OK and close out of the Modify Trap Address page. You have now

modified the trap community string and the trap IP address.

Upgrading Operating Software 39

Upgrading Operating Software

You can upgrade the management software using the Software Upgrade window.

CAUTION: It is suggested that when performing a software upgrade, you disable any security filters you have enabled. See “Modifying Security

Filters” on page 72.

To upgrade the software, complete the following steps:

1 Click Device View on the Toolbar.

2 Select System > Control > Software Upgrade in the Navigation Tree.

3 The Software Upgrade window is displayed.

4 Copy the software upgrade file into an appropriate directory on a TFTP

server.

5 Enter the name of the software field in the File name field. The filename

format is:

slbv350a.bin

CAUTION: You must use the slbv350a.bin format, otherwise the upgrade fails.

6 Enter the IP address of the TFTP server in the TFTP Server IP Address field.

7 Click OK.

During the upgrade, the Power/Self Test LED flashes green. The upgrade procedure takes about 5 minutes. When the upgrade is complete, the Server Load Balancer is reset.

CAUTION: During the upgrade, do not power-down or reset the Server Load Balancer.

40 CHAPTER 4: WORKING WITH THE WEB INTERFACE

CONFIGURING NON-REDUNDANT SERVER LOAD BALANCING

In this chapter, a typical non-redundant server load balancing scenario is presented, with instructions for configuring the Server Load Balancer.

The information presented in this chapter is for example purposes only and actual addresses will vary.

The following is a list of steps for the scenario presented for configuring non-redundant server load balancing. These steps explained in detail in this chapter are:

■ Server Load Balancing Configuration Example

■ Configuring for Non-redundant Server Load Balancing

Before you complete the steps explained in this chapter, you must have completed the assigning IP address setup described in Chapter 3 Setting Up for Management.

42 CHAPTER 5: CONFIGURING NON-REDUNDANT SERVER LOAD BALANCING

Server Load Balancing Configuration Example

Figure 11 displays a network configuration of two primary servers, Server A and Server B. The servers have been set up to host a Web site to the public. Server A is assumed to be a powerful machine that has approximately double the performance of Server B.

Figure 11 Server Load Balancing Configuration Example

Subnet 192.168.2.X

Server A

Router

Internet

Port 1

10.20.30.0

Server Load Balancer

VIP: 10.20.30.117

IF1: 10.20.30.116

IF2: 192.168.2.254

Port 5

Port 6

192.168.2.1 Port 80

Server B

192.168.2.2 Port 8080

Client

Configuring for Non-redundant Server Load Balancing 43

Configuring for Non-redundant Server Load Balancing

You must complete the steps in the Getting Started wizard to configure the Server Load Balancer for non-redundant server load balancing.

To setup up a non-redundant configuration, complete the following steps:

1 Click Device View on the Toolbar.

2 Select System > Getting Started in the Navigation Tree. The first Getting

Started page is displayed. Click Next.

44 CHAPTER 5: CONFIGURING NON-REDUNDANT SERVER LOAD BALANCING

3 Enter a descriptive name, such as Non-redundant SLB, in the Name

field.

4 Enter the name of the person to contact about the Server Load Balancer,

such as Chris, in the Contact field.

5 Enter the physical location of the Server Load Balancer, such as Lab, in

the Location field.

6 Click Next. The Getting Started - Configuration page appears.

7 Select Non-Redundant.

8 Click Next. The Getting Started - IP Settings page appears.

The IP Address, Subnet Mask and Default Router fields are completed. This is the information you assigned to the Server Load Balancer during the CLI setup.

If you change these settings, you may lose IP connectivity to the Web interface upon completion of this wizard. If this occurs, you will need to reconnect to the Server Load Balancer using the new IP address.

9 Click Next. The Getting Started - Network Address Translation page

appears.

If you are using private IP subnets for your server or cache subnets and want the servers or caches to be able to initiate connections to the outside, check NAT Enabled for Server and Cache Subnets. If NAT is enabled, packets initiated by the servers and the caches need to be given an IP address on the primary IP subnet. This address is the alias address.

10 Click Next. The Getting Started - Password page appears.

11 Click Finish. The parameters you have entered are ready to be applied.

You are now ready to configure the load balancing services. See Chapter 8 Configuring for Load Balancing.

CONFIGURING REDUNDANT SERVER LOAD BALANCING

In this chapter, a typical redundant server load balancing scenario is presented, with instructions for configuring the Server Load Balancer.

The information presented in this chapter is for example purposes only and actual addresses will vary.

The following is a list of steps for the scenario presented for configuring redundant server load balancing. These steps explained in detail in this chapter are:

■ Configuring for Active-Passive Redundancy

■ Configuring for Active-Active Redundancy

■ Active-Active Device Allocation

■ Setting Redundancy Settings

Before you complete the steps explained in this chapter, you must have completed the preliminary setup described in Chapter 3 Setting Up for Management.

46 CHAPTER 6: CONFIGURING REDUNDANT SERVER LOAD BALANCING

Redundant Server Load Balancing Configuration Example

Server Load Balancer 1

IP: 10.20.30.116 Peer IP Address: 10.20.30.56

Subnet Mask: 255.255.255.0

Default Router: 10.20.30.254

Port 5

Figure 12 shows how two Server Load Balancers and three servers form a redundant Web service. Server Load Balancer 1 is the Primary server load balancer which actively handles client requests sent to the VIP. Server Load Balancer 2 automatically recognizes the settings on Server Load Balancer 1 and is configured for the same service.

Figure 12 Redundant Server Load Balancing Configuration Example

Router

Subnet 10.20.30.X

L2 Switch

Port 1

Port 12

Redundant Link

Floating IP Address 192.168.2.200

Port 12

Server Load Balancer 2

IP Address: 10.20.30.56

Subnet Mask: 255.255.255.0 Default Router: 10.20.30.254

Port 1

Port5

Server A

IP: 192.168.2.1 Default Gtwy: Port: 80

192.168.2.200

L2 Switch

Server B

IP: 192.168.2.2 Default Gtwy: Port: 8080

192.168.2.200

Server C

IP: 192.168.2.3 Default Gtwy: Port: 80

192.168.2.200

Configuring for Active-Passive Redundancy 47

Configuring for Active-Passive Redundancy

You m ust co mple te th e Getting Started wizard to configure the Server Load Balancer for active-passive redundancy.

To setup up a for active-passive redundancy configuration, complete the following steps:

1 Click Device View on the Toolbar.

2 Select System > Getting Started in the Navigation Tree. The first Getting

Started page is displayed. Click Next.

3 Enter a descriptive name, such as Active-Passive, in the Name field.

4 Enter the name of the person to contact about the Server Load Balancer,

such as Bob, in the Contact field.

5 Enter the physical location of the Server Load Balancer, such as Office,

in the Location field. Click Next.

6 Select Redundant. The Getting Started - Select Device B page displays.

48 CHAPTER 6: CONFIGURING REDUNDANT SERVER LOAD BALANCING

7 Select the serial number of Device B. In this case, this is the second Server

Load Balancer. If the device you wish to use as Device B does not appear in the list, check

that the cable linking Device B to Device A is connected properly.

8 Click Next. The Getting Started - IP Settings page appears.

The IP Address, Subnet Mask and Default Router fields are completed. These is the information you assigned to the Server Load Balancer during the CLI setup.

9 Enter 10.20.30.56 in the Device B IP Address field.

This is the IP address assigned to the second Server Load Balancer.

10 Click Next. The Getting Started - Network Address Translation page

appears.

11 Click Next. The Getting Started - Password page appears.

12 Click Next. The Getting Started - Advanced page appears

13 Click Continue with Advanced Settings and click Next.

14 Select Active-Passive and click Next. The Getting Started - Summary page

appears.

15 Click Finish. Your parameters you have entered are ready to be applied.

Configuring for Active-Active Redundancy 49

Configuring for Active-Active Redundancy

You m ust co mple te th e Getting Started wizard to configure the Server Load Balancer for active-active redundancy.

To setup up an active-active redundancy configuration, complete the following steps:

1 Click Device View on the Toolbar.

2 Select System > Getting Started in the Navigation Tree. The first Getting

Started page is displayed. Click Next.

3 Enter a descriptive name, such as Active-Active, in the Name field.

4 Enter the name of the person to contact about the Server Load Balancer,

such as Dave, in the Contact field.

5 Enter the physical location of the Server Load Balancer, such as Lab, in

the Location field. Click Next.

6 Select Redundant and click Next. The Getting Started - Peer page

displays. Click Next.

50 CHAPTER 6: CONFIGURING REDUNDANT SERVER LOAD BALANCING

7 Select the serial number of the peer device. In this case, the peer device is

the second Server Load Balancer.

8 Click Next. The Getting Started - IP Settings page appears.

9 The IP Address, Subnet Mask and Default Router fields are completed.

These is the information you assigned to the Server Load Balancer during the CLI setup.

10 Enter 10.20.30.56 in the Device B IP Address field.

This is the IP address assigned to the second Server Load Balancer.

11 Click Next. The Getting Started - Network Address Translation page

appears.

12 Click Next. The Getting Started - Password page appears.

13 Click Next. The Getting Started - Advanced page appears

14 Click Continue with Advanced Settings and click Next.

15 Select Active-Active and click Next. The Getting Started - Summary page

appears.

16 Click Finish. The parameters you have entered are ready to be applied.

You are now ready to configure the load balancing services. See Chapter 8 Configuring for Load Balancing.

Setting Redundancy Settings 51

Active-Active Device

Allocation

Setting Redundancy Settings

Active-Active device allocation can only be performed when the Server Load Balancer has been configured to be redundant and active-active. The Active-Active device allocation page allows you to allocate which services are currently active on the two redundant Server Load Balancers. You can allocate FTP to one Server Load Balancer and HTTP to the other. The two Server Load Balancers each provide only the allocated services, until a failover occurs.

To setup up a active-active device allocation, complete the following steps:

1 Click Logical View on the Toolbar.

2 Select Server Load Balancing > Active-Active Device. The Active-Active

Device Allocation page is displayed.

3 Choose the virtual host(s) you wish to change the position of.

4 Click on the host and then click the appropriate arrow.

You are now ready to configure the load balancing services. See Chapter 8 Configuring for Load Balancing.

Whether you are configured for non-redundant or redundant server load balancing, if there are multiple Server Load Balancers, the Virtual Router Identifier (VRID) for each device must be unique or the service may not come up and one of the other Server Load Balancers declares itself the primary device.

To enter a unique number for the VRID, complete the following steps:

1 Click Logical View on the Toolbar.

2 Select Server Load Balancing > Redundancy Setting in the Navigation

Tree. The Redundancy Settings page is displayed.

3 Enter 25 in the Virtual router ID A field.

4 Enter 26 in the Virtual router ID B field.

5 Click OK.

52 CHAPTER 6: CONFIGURING REDUNDANT SERVER LOAD BALANCING

CONFIGURING CACHE REDIRECTION

In this chapter, a typical application redirection scenario is presented, with directions for configuring the Server Load Balancer.

The information presented in this chapter is for example purposes only and actual addresses will vary.

The following list provides a checklist of the configuration steps for the scenario presented for configuring cache redirection on the Server Load Balancer. These steps are explained in detail in this chapter:

■ Defining a Cache Subnet

■ Non-redundant Configuration

■ Redundant Configuration

■ Adding a Cache

■ Assigning Caches to Services

■ Creating a Cache Profile (Optional)

54 CHAPTER 7: CONFIGURING CACHE REDIRECTION

Cache Redirection Configuration Example

Figure 13 illustrates a sample network configuration for cache redirection. This example displays how cache redirection works.

A request is entered into the browser, for example, http://www.3Com.com. The browser then sends the request to the Server Load Balancer.

The Server Load Balancer looks at the protocol and determines that it is the HTTP protocol and forwards the request to the cache server.

Upon receipt of the request, the cache server determines whether it has a local copy of the requested page. If not, the cache server sends its own request to www.3Com.com. When www.3Com.com responds to the cache server, the cache server forwards the response to the client, and if permitted, makes a local copy.

Figure 13 Cache Redirection Configuration Example

Server Load

Balancer

Router

Internet

Web

Browser

Server

Cache

Server

Defining a Cache Subnet 55

Defining a Cache Subnet

Non-redundant

Configuration

Before you can add a cache, you need to have defined at least one cache subnet.

The cache subnet cannot be in the same subnet as the server.

The following steps describe how to create a cache subnet if you are configured for non-redundant server load balancing.

To create a cache subnet, complete the following steps:

1 Click Logical View on the Toolbar.

2 From the Navigation tree, select System > Setup > Cache Subnets.

3 Click Add. The first wizard page appears.

4 Click Next. The Cache Subnet - Configure Address page appears. 5 Enter 192.168.3.200 in the IP Address field.

6 Enter 255.255.255.0 in the Subnet Mask field.

7 Click Next. The Cache Subnet - Floating Address page appears.

8 Complete the entry in the Floating Address field. This is the floating

default gateway IP address. For example, 192.168.3.150.

Do not forget to change the default gateway on your caches to this IP address.

9 Click Next. The Cache Subnet page appears.

10 Click Finish. Your cache subnet has been added.

56 CHAPTER 7: CONFIGURING CACHE REDIRECTION

Redundant

Configuration

The following steps describe how to create a cache subnet if you are configured for redundant server load balancing.

The cache subnet cannot be in the same subnet as the server.

To create a cache subnet, complete the following steps:

1 Click Logical View on the Toolbar.

2 From the Navigation tree, select System > Setup > Cache Subnets.

3 Click Add. The first wizard page appears.

4 Click Next. The Cache Subnet - Configure Address page appears.

5 Enter 192.168.3.200 in the Device A IP Address field.

6 Enter 192.168.3.100 in the Device B IP Address field.

7 Enter 255.255.255.0 in the Subnet Mask field.

8 Click Next. The Cache Subnet - Device A Floating Address page appears.

9 Complete the entry in the Device A Floating Address field. This is the

floating default gateway IP address. For example, 192.168.3.150.

Do not forget to change the default gateway on your caches to this IP address.

10 Click Next.

11 Click Finish. Your cache subnet has been added.

Adding a Cache 57

Adding a Cache This is where the cache service is defined, along with several attributes of

the service.

1 Click Logical View on the Toolbar.

2 Point to the Cache window border and left-click the mouse button.

3 In the pop-up list, click Add. The Configure Cache page appears.

If you have not defined a cache subnet, you will be prompted with a Warning message asking if you wish to define the cache subnet now. See “Defining a Cache Subnet” on page 58.

4 Complete the entry in the IP Address field. For example, 192.168.3.1.

5 Enter Cache1 in the Name field.

6 Select the cache type and click Add. There are two available cache types:

■ Transparent

■ Proxy

7 Click Done.

Assigning Caches to Services

The Assign Caches to Services page is where the caches are assigned to cache redirection.

The Cache Assignments button is highlighted only if an HTTP service has been created.

1 Click Cache Assignments. The Assign Caches to Services page appears. 2 Click on the cell to assign a cache service.

3 Click on the cell next to Cache1. The Assign cache to service pop-up

menu appears.

4 Click Assign cache to service. The cell for Server A is assigned.

5 Repeat the above steps for each of the caches you have created.

58 CHAPTER 7: CONFIGURING CACHE REDIRECTION

Showing Status and

Deleting the Cache

Creating a Cache Profile (Optional)

To view the status of the cache assignments, complete the following steps:

1 Click Cache Assignments. The Assign Caches to Services page appears

2 Click the cell for Cache1. A pop-up menu with the option to Show status

or Delete appears.

a If you wish to view the status of the server, click Show status. The

Mapping Status dialog appears. This dialog box tells you the status of

the service running on the assigned cache server. b If you wish to delete the cache from the service, click Delete. You are

prompted with a message asking you if you are sure you want to

delete the cache from the service.

3 Repeat the above steps for each of the servers you have assigned.

You can create a unique cache profile that specifies a specific algorithm and assign a health check to monitor the status of the servers. You can set the health parameters and assign the number of retries, seconds (period) and timeout seconds.

A default cache profile set to Round-robin exists and will work for most applications.

To create a cache profile, complete the following steps:

1 Click Logical View on the Toolbar.

2 From the Navigation tree, select Server Load Balancing > Cache Profiles.

3 Click Add. The first wizard page appears.

4 Click Next. The Cache Profile Configuration - General Information page

appears.

5 Enter a descriptive name, such as Cache2, in the Name field.

Creating a Cache Profile (Optional) 59

6 Choose a algorithm. The default algorithm is Round-robin. Table 10

describes the available algorithms.

Ta b le 1 0 Supported Algorithms and Description

Supported Algorithms Description

Destination The Destination IP address of the client's packets is

Round Robin Each new connection is assigned to the next server in

Weighted Round Robin Similar to Round Robin, except that N consecutive new

Least Connections Each new connection is assigned to the server having

Weighted Least Connections

hashed and used as an index to an array of active servers bound to the service. This is appropriate for redirection of sessions between a smaller set of clients and a larger set of servers, for example, local users of the extraNet, or the World-Wide Web

the list. This distributes connections evenly between the servers.

connections are assigned to a server before selecting the next server in the list, where N is the weight assigned to the server. Servers with higher performance or capacity should be assigned higher weight.

The weight assigned to the server is assigned using the Assign caches to services (Advanced)... window. A weight field is provided.

the fewest number of open connections. If several servers have the same low number of open connections, then the new connection is sent to the server that was least recently sent a new connection

Similar to Least Connections, except that N consecutive new connections are assigned to a server before next selecting the server with the least number of open connections, where N is the weight assigned to the server

7 Leave Sticky Mode field set to Off.

8 The default health check is Ping, click Next. Other available health checks

are:

■ Ping — Server Load Balancer periodically pings each server using ICMP

Echo. The number of retries are configurable. If successive ping attempts fail, the server is marked as down and is removed from the pool of available servers.

60 CHAPTER 7: CONFIGURING CACHE REDIRECTION

■ TCP Port — Server Load Balancer periodically attempts to establish a

connection with each server using the same protocol (TCP or UDP)

and port number as the server load balancing service uses. If any

connection attempt fails, the server is marked as down and is removed

from the pool of available servers for the service.

■ None — No health checking is performed. All Servers are assumed to

be operational.

9 The Cache Profile Configuration - Health Checks page appears. This page

supplies default settings, which can be modified for your network, for the following fields:

■ Period

This sets the number of seconds that elapse between health checks.

■ Retries field

This sets the number of retries a health check is attempted.

■ Timeout

This sets the number of seconds the Server Load Balancer waits for a reply before the health check is timed out.

10 Click Next.

11 Click Finish.Your cache profile has been created.

CONFIGURING FOR LOAD BALANCING

In this chapter the instructions for configuring User Groups, Services and Servers on the Server Load Balancer are explained. It also explains how to configure for cache redireciton.

The information presented in this chapter is for example purposes only. The information you enter in the fields is specific to your Server Load Balancer.

The following is a list of steps for the scenario presented for configuring server load balancing and cache redirection on the Server Load Balancer. These steps explained in detail in this chapter are:

■ Defining a Server Subnet

■ Changing Lan Port Roles

■ Adding a Server

■ Adding a Service

■ Assigning Servers to Service

■ Adding a User Group

■ Creating a Balance Profile (Optional)

■ Modifying Security Filters (Attack Mitigation)

Before you complete the steps explained in this chapter, you must have completed the preliminary setup described in Chapter 3 Setting Up for Management and in either Chapter 5 Configuring Non-redundant Server Load Balancing or Chapter 6 Configuring Redundant Server Load Balancing.

62 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

Defining a Server Subnet

Before you can add a server, you need to have defined at least one server subnet. The default gateway of each server must be set to the floating default gateway address of the Server Load Balancer.

To define a server subnet, complete the following steps:

1 Click Logical View on the Toolbar.

2 From the Navigation tree, select Server Load Balancing > Setup -> Server

Subnets.

3 Click Add. The first wizard page appears.

4 Click Next. The Server Subnet - Define Subnet page appears.

5 Enter 192.168.2.254 in the IP Address field.

If configuring for a redundant configuration, you need to enter the IP addresses of both Device A and Device B.

6 Enter 255.255.255.0 in the Subnet Mask field.

7 Click Next. The Server Subnet - Device A Floating Address page appears 8 Complete the entry in the Floating Address field. For example,

192.168.2.200.

Do not forget to change the default gateway on your servers to this IP address

9 Click Finish. Your server subnet has been added.

Changing Lan Port Roles 63

Changing Lan Port Roles

When configuring server load balancing, the physical ports that carry client or server traffic can be specified. Each port is assigned to one of the following:

■ User Access — Defines a port through which clients can access the

Server Load Balancer.

■ Cache Access — Defines a port to which a cache device is connected.

■ Server Access — Defines a port to which servers are connected, either

directly or through a network switch.

■ Management Access — Defines the port used for management access

to the Server Load Balancer. If no Management Access port is specified, you can manage the Server Load Balancer through any user access port.

■ Redundant Link — Defines the port connected as a redundant link to

another Server Load Balancer. Only one redundant link port is allowed.

To change Lan port roles, complete the following steps:

1 Click Logical View on the Toolbar.

2 Select Server Load Balancing > Setup > Lan Port Roles in the Navigation

Tree. The Lan Port Roles page appears.

3 Click a port to open a pop-up menu that contains operations which you

can set for that particular port.

4 Choose the access you want. For example, if you wish to assign port 1

from the current access to Server Access, complete the following:

a Click on the port for 1. A pop-up menu appears with a list of port

roles.

b Click Server Access. The Saving Data window appears and the port

changes color.

c Click Close.

64 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

Adding a Server The servers must first be defined before they can be bound to a particular

service. The server is given an arbitrary name (this does not have to be its DNS name) and is identified by its IP address.

To define a server, complete the following steps:

1 Click Logical View on the Toolbar.

2 Point to the Server window border and left-click the mouse button.

3 In the pop-up list, click Add. The first Configure Server page appears.

If you have not defined a server subnet, you will be prompted with a Warning message asking if you wish to define the server subnet now. If you click Yes, follow the online instructions. For information on how to configure a Server Subnet, see “Defining a Server Subnet” on page 62.

4 Enter 192.168.2.1 in the IP Address field and click Add

5 Enter Server A in the Name field.

6 Repeat steps 4 and 5 for each server you are adding.

7 Click Done.

The servers are now known to the Server Load Balancer, but are not associated with a service.

Adding a Service 65

Adding a Service This is where the load balancing service is defined, along with several

attributes of the service. Remember that the service is associated with an IP address (the VIP) and a protocol/port combination (the application).

To define a service, complete the following steps:

1 Click Logical View on the Toolbar.

2 Point to the Services window border and left-click the mouse button.

3 In the pop-up list, click Add. The first wizard page appears.

4 Click Next. The Add Service - Application Definition page appears

5 Enter a descriptive name, such as Web, in the Name field.

6 Click Choose application from application library. You are presented with

a list of applications, grouped by application type.

7 Highlight HTTP and click the Next. 8 Click Define new virtual IP address and enter 10.20.30.117 in the

Virtual IP Address field. The VIP address has to be in the same subnet as the Server Load Balancer.

9 Enter a descriptive name, such as HTTP Service, in the Name field. 10 Click Continue with Advanced Settings.

11 From the Balance Profile drop-down list box, select Profile1.

If you have not created a balance profile, the drop-down list box only provides a default. See “Creating a Balance Profile (Optional)” on page 69.

12 Skip the Add Service - Port Override page. Click Next. The port override

allows you to change the destination port that (TCP or UDP) requests will come into.

13 Click Finish. This completes the set up of the service.

The service name you added, Web, now appears in the lower portion of the block. Click on a the block to open a pop-up menu that contains operations you can use to Add, Refresh, Delete, Modify, or Show Status of the service.

66 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

Assigning Servers to Service

Showing Status and

Deleting the Server

The Assign Servers to Services page is where the servers are assigned to the server load balancing service.

To assign a server to a service, complete the following steps:

1 Click Server Assignments. The Assign servers to services page appears.

2 Click on the cell next to Server A. The Assign server to service pop-up

menu appears.

3 Click Assign server to service. The cell for Server A is assigned.

4 Repeat the above steps for each of the servers you have created.

To show the status of a server assignments or to delete one, complete the following steps:

1 Click Server Assignments. The Assign servers to services page appears

2 Click the cell for Server A. A pop-up menu with the option to Show status

or Delete appears.

a If you wish to view the status of the server, click Show status. The

Mapping Status dialog appears. This dialog box tells you the status of

the service running on the assigned server.

b If you wish to unassign the server, click Delete. You are prompted with

a message asking you if you are sure you want to delete the server from the service.

3 Repeat the above steps for each of the servers you want unassigned.

Assigning Servers to Service 67

Assigning Server to

Services (Advanced)

In addition to performing Network Address Translation, the Server Load Balancer is capable of translating the TCP or UDP port on which the service is operating. The virtual service can be configured for a well known port, while the servers respond to an alternate port. For example, a Web service is set up on the standard TCP port 80 and translated to

8080. When a request is received from a client on port 80, the Server Load Balancer changes the port to 8080 before forwarding the packet on to one of the available servers. When the server reply is received by the Server Load Balancer, it changes the port number back to 80, then forwards the packet on to the client.

To change the port, complete the following steps:

1 Click Server Assignments.

2 Click on the cell next to Server A. A pop-up menu appears.

3 Click Assign server to service (Advanced).... The Assign Server to Service

window appears.

4 Enter 8080 in the Server port field.

5 Click OK.

68 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

Adding a User Group

Adding IP Address

Ranges to User

Groups

You can define a user group and control that group’s access to the load balanced services. For each request to a service, the Server Load Balancer determines which user group the client IP address is part of. It then allows or denies access to the service based on the permissions that were set for this user group.

The Server Load Balancer has a default user group that is defined as

0.0.0.0 to 255.255.255.255. This user group includes every possible IP address.

To add a user group, complete the following steps:

1 Click Logical View on the Toolbar.

2 Point to the User Group window border and left-click the mouse button.

3 In the pop-up list, click Add. The Add User Group window appears.

4 Enter a descriptive name, such as Engineering, in the Name field.

It is recommended to keep the user group name to a maximum of 20 characters.

5 Repeat Step 4 for every user group you wish to add and click Add.

6 When you have finished entering your user groups, click Done.

Adding IP address ranges defines those IP addresses that make up your user group. The Server Load Balancer recognizes any address within these ranges to be part of the user group.

If a request comes, the Server Load Balancer determines that the client is part of the Engineering user group and checks the permissions set for Engineering for the service requested.

To add IP address ranges to your user group, complete the following steps:

1 Click Logical View on the Toolbar.

2 Point to the User Group window border and left-click the mouse button.

3 In the pop-up list, click Add address range...

4 From the User Group drop-down list box, select Engineering.

5 Enter 192.168.1.100 in the First IP Address field. 6 Enter 192.168.1.150 in the Last IP Address field and click Done.

Creating a Balance Profile (Optional) 69

Accessing

Permissions

Creating a Balance Profile (Optional)

You can change user access on specific servers using the Permissions button. You are able to allow or deny access for assigned user groups.

To assign permissions, complete the following steps:

1 Click Permissions.

2 Click on the cell next to Server A. Depending on the access already set,

you are prompted with either Deny Access or Allow Access.

3 Click the access you wish to set. The icon changes.

4 Click OK.

You can create a unique balance profile that specifies a specific algorithm and assign a health check to monitor the status of the servers. You can set the health parameters and assign the number of retries, seconds (period) and timeout seconds.

A default balance profile set to Round-robin exists and will work for most applications.

To create a balance profile, complete the following steps:

1 Click Logical View on the Toolbar.

2 From the Navigation tree, select Server Load Balancing > Balance Profiles.

3 Click Add. The first wizard page appears.

4 Click Next. The Balance Profile Configuration - General Information page

appears.

5 Enter a descriptive name, such as Profile1, in the Name field.

70 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

6 Choose a balancing algorithm. The default balance profile is

Round-robin. Table 11 describes the available algorithms.

Ta b le 1 1 Supported Algorithms and Descriptions

Supported Algorithms Description

Round Robin Each new connection is assigned to the next server in

Weighted Round Robin Similar to Round Robin, except that N consecutive new

Least Connections Each new connection is assigned to the server having

Weighted Least Connections

Quickest Last Response When a new connection is established between a

Quickest Average Response

the list. This distributes connections evenly between the servers.

The weight assigned to the server is assigned using the Assign server to service (Advanced)... window. A weight field is provided.

the fewest number of open connections. If several servers have the same low number of open connections, then the new connection is sent to the server that was least recently sent a new connection

client and server, the Server Load Balancer monitors the client's first request for data. When the server responds to the initial request, the Server Load Balancer notes the time delay between the request and the response and stores that value as the server's response time. Each new connection is sent to the server having the fastest response time.

Since server response time changes dynamically, a decay algorithm is applied periodically to all response times to prevent a server from being locked out after one long response delay

Similar to Quickest Last Response, except the response time is averaged over approximately the last eight measurements for the server. A decay algorithm is also applied to the average response times

Creating a Balance Profile (Optional) 71

7 Leave Sticky Mode field set to Off.

8 The default health check is Ping, click Next. Other available health checks

are:

■ Ping — Server Load Balancer periodically pings each server using ICMP

Echo. The number of retries are configurable. If successive ping attempts fail, the server is marked as down and is removed from the pool of available servers.

■ TCP Port — Server Load Balancer periodically attempts to establish a

connection with each server using the same protocol (TCP or UDP) and port number as the server load balancing service uses. If any connection attempt fails, the server is marked as down and is removed from the pool of available servers for the service.

■ HTTP URI — You can enter a URI that the Server Load Balancer

periodically requests from each server. A server response is considered successful if the return code of response is within the range of 200-299. If any attempts fail, the server is marked as down and is removed from the pool of available servers for the service. This performs a more thorough check of the status of the Web servers.

■ None — No health checking is performed. All Servers are assumed to

be operational.

9 The Balance Profile Configuration - Health Checks page appears. This

page supplies default settings, which can be modified for your network, for the following fields:

■ Period

This sets the number of seconds that elapse between health checks.

■ Retries field

This sets the number of retries in a health check period.

■ Timeout

This sets the number of seconds the Server Load Balancer waits for a health check reply from a server.

10 Click Next.

11 Click Finish. Your balance profile has been created.

72 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

Modifying Security Filters (Attack Mitigation)

The Server Load Balancer provides Attack Mitigation features that help to prevent Denial of Service and Distributed Denial of Service attacks.

When enabled, the attack mitigation features cause the Server Load Balancer to recognize and filter out security attacks. Table 12 describes the available filters and their descriptions.

Ta b le 1 2 Filters and Descriptions

Filter Description

Smurf Filter Filter ICMP packets sent to broadcast or multicast

addresses and unsolicited ICMP ECHO replies FTP Restricted Port Filter Filter out a range of FTP data port requests.

IP Source Route Filter Filter packets which contain the IP source route option. LAND Attack Filter packets which have matching destination and

source IP addresses.

Fraggle Attack Filter Filter UDP ECHO requests sent to a broadcast or

multicast address and unsolicited UDP packets from

the UDP ECHO port. FTP Bounce Filter Filter FTP traffic when the port command issued

contains an address that differs from the requesting

host. IP Options Filter Filter packets that contain any IP options (for example,

Record Route and Time Stamp) in the packet header.

You can filter packets which have packet headers

containing only the Strict Source Route and Loose

Source Route IP options using the IP Source Route filter

Modifying Security

Filters

To modify the security filters, complete the following steps:

1 Click Device View on the Toolbar.

2 Select Security > Attack Filters.

3 Click Modify. The Modify Attack Filters page appears.

4 Select the attack filters you wish to enable and click OK.

Modifying Security Filters (Attack Mitigation) 73

Modifying User

Access

To modify the access of either the admin or monitor user, complete the following steps:

1 Click Device View on the Toolbar.

2 Select Security > User.

3 You can modify the user access for either the admin or monitor.

Modifying Admin Access a To modify the admin access, click Modify Admin. The Modify

Password page appears.

b Enter a new password and confirm.

Modifying Monitor Access a To modify the monitor access, click Modify Monitor. The Modify

Password page appears.

b Enter a new password and confirm.

74 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

SAFETY INFORMATION

You must read the following safety information before carrying out any installation or removal of components, or any maintenance procedures on the Server Load Balancer or the Server Load Balancer Plus.

WARNING: Warnings contain directions that you must follow for your personal safety. Follow all directions carefully. You must read the following safety information carefully before you install or remove the unit.

AVERTISSEMENT: Les avertissements présentent des consignes que vous devez respecter pour garantir votre sécurité personnelle. Vous devez respecter attentivement toutes les consignes. Nous vous demandons de lire attentivement les consignes suivantes de sécurité avant d’installer ou de retirer l’appareil.

WARNHINWEIS: Warnhinweise enthalten Anweisungen, die Sie zu Ihrer eigenen Sicherheit befolgen müssen. Alle Anweisungen sind sorgfältig zu befolgen. Sie müssen die folgenden Sicherheitsinformationen’ sorgfältig durchlesen, bevor Sie das Gerät installieren oder ausbauen.

76 APPENDIX A: SAFETY INFORMATION

Important Safety Information

■ Installation and removal of the unit must be carried out by qualified

personnel only.

■ If installing the Server Load Balancer in a stack with SuperStack 3 units

that are narrower than the Server Load Balancer, the Server Load Balancer unit must be installed below the narrower units.

■ Connect the unit to an earthed power supply to ensure compliance

with safety standards.

■ Power Cord Set:

This must be approved for the country where it is used:

U.S.A. and Canada

United Kingdom only

Europe only: ■ The supply plug must comply with CEE 7/7 (“SCHUKO”).

Denmark ■ The supply plug must comply with section 107-2-D1,

Switzerland ■ The supply plug must comply with SEV/ASE 1011.

■ The cord set must be UL-approved and CSA certified.

■ The minimum specification for the flexible cord is:

No. 18 AWG Type SV or SJ 3-conductor

■ The cord set must have a rated current capacity of at least

10A.

■ The attachment plug must be an earth-grounding type

with a NEMA 5-15P (15A, 125V) or NEMA 6-15P (15A, 250V) configuration.

■ The supply plug must comply with BS1363 (3-pin 13 amp)

and be fitted with a 5A fuse which complies with BS1362.

■ The mains cord must be <HAR> or <BASEC> marked and

be of type H03VVF3GO.75 (minimum).

■ The mains cord must be <HAR> or <BASEC> marked and

be of type H03VVF3GO.75 (minimum).

standard DK2-1a or DK2-5a.

■ The appliance coupler (the connector to the unit and not the wall

plug) must have a configuration for mating with an EN60320/IEC320 appliance inlet.

■ The socket outlet must be near to the unit and easily accessible. You

can only remove power from the unit by disconnecting the power cord from the outlet.

Important Safety Information 77

■ This unit operates under SELV (Safety Extra Low Voltage) conditions

according to IEC 950. The conditions are only maintained if the equipment to which it is connected also operates under SELV conditions.

■ France and Peru only:

†

This unit cannot be powered from IT

supplies. If your supplies are of IT type, this unit must be powered by 230V (2P+T) via an isolation transformer ratio 1:1, with the secondary connection point labelled Neutral, connected directly to earth (ground).

†

Impédance à la terre.

■ The switch should only be used in a rack if it is mounted on runners, a

shelf, or a tray to support the weight. The rack mount kits alone are not sufficient to support the weight of the switch. The rack mount kits must not be used to suspend the switch from under a table or desk, or attach it to a wall.

■ If you are connecting the Server Load Balancer to a Type 3 Power

Module, read the Safety Information section in the Type 3 Power Module User Guide.

■ WARNING: Fiber Optic ports - Optical Safety

■ Never look at the transmit laser while it is powered-up. Never look

directly at the fiber TX port and fiber cable ends when they are powered-up.

■ Use of controls or adjustments of performance or procedures other

than those specified herein may result in hazardous laser emissions.

78 APPENDIX A: SAFETY INFORMATION

L’information de Sécurité Importante

■ L'installation et la dépose de ce groupe doivent être confiés à un

personnel qualifié.

■ Si vous entassez l'unité Switch avec les unités SuperStack 3 Hub,

l'unité Server Load Balancer doit être installée en dessous des unités Hub plus étroites.

■ Brancher l’unité à une source de courant mise à la terre pour assurer la

conformité aux normes de sécurité.

■ Cordon électrique:

Il doit être agréé ans le pays d'utilisation:

Etats-Unis et Canada

Danemark ■ La prise mâle d'alimentation doit respecter la section 107-2

Europe ■ La prise secteur doit être conforme aux normes CEE 7/7

Suisse ■ La prise mâle d'alimentation doit respecter la norme SEV/ASE

■ Le cordon doit avoir reçu l'homologation des UL et un

certificat de la CSA

■ Le cordon souple doit respecter, à titre minimum, les

spécifications suivantes :

■ calibre 18 AWG

■ type SV ou SJ

■ à 3 conducteurs

■ Le cordon doit être en mesure d'acheminer un courant

nominal d'au moins 10 A

■ La prise femelle de branchement doit être du type à mise à la

terre (mise à la masse) et respecter la configuration NEMA 5-15P (15 A, 125 V) ou NEMA 6-15P (15 A, 250 V)

D1 de la norme DK2 1a ou DK2 5a

(“SCHKO”)

■ LE cordon secteur doit porter la mention <HAR> ou

<BASEC> et doit être de type HO3VVF3GO.75 (minimum).

1011

■ Le coupleur d'appareil (le connecteur du groupe et non pas la prise

murale) doit respecter une configuration qui permet un branchement sur une entrée d'appareil EN60320/CEI 320.

■ La prise secteur doit se trouver à proximité de l’appareil et son accès

doit être facile. Vous ne pouvez mettre l’appareil hors circuit qu'en débranchant son cordon électrique au niveau de cette prise.

L’information de Sécurité Importante 79

■ L’appareil fonctionne à une tension extrêmement basse de sécurité qui

est conforme à la norme CEI 950. Ces conditions ne sont maintenues que si l'équipement auquel il est raccordé fonctionne dans les mêmes conditions.

■ France et Pérou uniquement:

Ce groupe ne peut pas être alimenté par un dispositif à impédance à la terre. Si vos alimentations sont du type impédance à la terre, ce groupe doit être alimenté par une tension de 230 V (2 P+T) par le biais d'un transformateur d'isolement à rapport 1:1, avec un point secondaire de connexion portant l'appellation Neutre et avec raccordement direct à la terre (masse).

■ Le commutateur doit être utilisé en rack uniquement s’il est monté sur

des rails à glissières, une étagère ou un plateau pour supporter son poids. Les kits de montage en rack ne suffisent pas à eux seuls pour supporter le poids du commutateur.

■ Si vous connectez le commutateur Server Load Balancer à un

moduled'alimentation de Type 3, consultez les informations de sécurité qui se trouvent dans le guide del'utilisateur du module d'alimentation de type 3.

AVERTISSEMENT: Ports pour fibres optiques – sécurité sur le plan optique

■ Ne regardez jamais le laser tant qu'il est sous tension. Ne regardez

jamais directement le port TX (Transmission) à fibres optiques et les embouts de câbles à fibres optiques tant qu'ils sont sous tension.

■ L'utilisation de contrôles, de réglages de performances ou de

procédures autres que ceux qui sont spécifiés au sein du présent document risquent d'entraîner l'exposition à des rayonnements laser dangereux.

80 APPENDIX A: SAFETY INFORMATION

Wichtige Sicherheitsinformat ionen

■ Die Installation und der Ausbau des Geräts darf nur durch

Fachpersonal erfolgen.

■ Wenn die Server Load Balancer Einheit in einer Stapel mit anderen

SuperStack 3 Hub Einheiten eingebaut werden soll, muß die Server Load Balancer Einheit unter die schmaleren Hub Einheiten eingebaut werden.

■ Das Gerät muß an eine geerdete Steckdose angeschlossen werden,

die europäischen Sicherheitsnormen erfüllt.

■ Der Anschlußkabelsatz muß mit den Bestimmungen des Landes

übereinstimmen, in dem er verwendet werden soll.

■ Der Gerätestecker (der Anschluß an das Gerät, nicht der

Wandsteckdosenstecker) muß eine passende Konfiguration für einen Geräteeingang gemäß EN60320/IEC320 haben.

■ Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich

sein. Die Stromversorgung des Geräts kann nur durch Herausziehen des Gerätenetzkabels aus der Netzsteckdose unterbrochen werden.

Europe

■ Das Netzkabel muß vom Typ HO3VVF3GO.75

(Mindestanforderung) sein und die Aufschrift <HAR> oder <BASEC> tragen.

■ Der Netzstecker muß die Norm CEE 7/7 erfüllen (”SCHUKO”).

■ Der Betrieb dieses Geräts erfolgt unter den SELV-Bedingungen

(Sicherheitskleinstspannung) gemäß IEC 950. Diese Bedingungen sind nur gegeben, wenn auch die an das Gerät angeschlossenen Geräte unter SELV-Bedingungen betrieben werden.

■ Der Switch darf nur dann in einem Einschub montiert werden, wenn

dieser zur Tragkraftverstärkung auf einer Laufschiene, in einem Regal oder einem Träger montiert ist. Der Einschubmontagesatz alleine reicht nicht aus, um das Gewicht des Switch zu tragen.

■ Ist kein Erweiterungsmodul installiert, überprüfen Sie bitte den Sitz der

Stanzplatte, indem Sie alle Schrauben mit einem geeigneten Werkzeug anziehen.

■ Bevor Sie den Schalter Server Load Balancer an das

Stromversorgungsmodul Typ 3 anschließen, lesen Sie bitte die Sicherheitshinweise in der Bedienungsanleitung für das Stromversorgungsmodul Typ 3.

Wichtige Sicherheitsinformationen 81

ACHTUNG: Faseroptikanschlüsse – Optische Sicherheit

■ Niemals ein Übertragungslaser betrachten, während dieses

eingeschaltet ist. Niemals direkt auf den Faser-TX-Anschluß und auf die Faserkabelenden schauen, während diese eingeschaltet sind.

■ Die Verwendung von Steuerelementen oder die Anpassung von

Leistungen und Verfahren in anderer als der hierin genannten Weise kann zu gefährlichen Laseremissionen führen.

82 APPENDIX A: SAFETY INFORMATION

TECHNICAL SPECIFICATIONS AND PIN-OUTS

Server Load Balancer Specifications

Physical Dimensions Height: 65.8 mm (2.59 in.) x Width: 440 mm (17.3 in.) x Depth: 368.4 mm

Environmental Requirements

Operating Temperature 0 ° to 40 °C (32 ° to 104 °F)

Storage Temperature –40 ° to +70 °C (–8 ° to 158 °F) Operating Humidity 10–95% relative humidity, non-condensing

Standards EN60068 to 3Com schedule (Package testing: paras 2.1, 2.2, 2.30, and 2.32.

Safety

Agency Certifications UL 1950, EN60950, CSA 22.2 No. 950, IEC 60950, IEC 825-1, EN 60825-1

EMC

Emissions CISPRR 22 Class A, EN55022 (1998) Class A, FCC Part 15 Subpart B Class A,

Immunity EN 55024 (1998)

Heat Dissipation 250 watts maximum (850 BTU/hour maximum)

Power Supply

AC Line Frequency 50/60 Hz Input Voltage Options 100–240 VAC

Current Rating 3 A (amps ) (maximum)

The following table lists the technical specifications for the Server Load Balancer and the Server Load Balancer Plus:

(14.5 in.). Weight: 6.6 Kg (14.55 lbs)

Operational testing: paras 2.1, 2.2, 2.30 and 2.13).

ICES-003 Class A, VCCI Class A, AS/NZS 3548 Class A, CNS 13438 Class A, EN61000-3-2

84 APPENDIX B: TECHNICAL SPECIFICATIONS AND PIN-OUTS

Console Port Cable 9-pin to RS232 25-pin

PC-AT Serial 9-pin to 9-pin

TECHNICAL SUPPORT

3Com provides easy access to technical support information through a variety of services. This appendix describes these services.

Information contained in this appendix is correct at time of publication. For the most recent information, 3Com recommends that you access the 3Com Corporation World Wide Web site.

Online Technical Services

World Wide Web Site To access the latest networking information on the 3Com Corporation

3Com

Knowledgebase Web

Services

3Com offers worldwide product support 24 hours a day, 7 days a week, through the following online systems:

■ World Wide Web site

■ 3Com Knowledgebase Web Services

■ 3Com FTP site

World Wide Web site, enter this URL into your Internet browser:

http://www.3com.com/

This service provides access to online support information such as technical documentation and software, as well as support options that range from technical education to maintenance and professional services.

This interactive tool contains technical product information compiled by 3Com expert technical engineers around the globe. Located on the World Wide Web at 3Com customers and partners complementary, round-the-clock access to technical information on most 3Com products.

http://knowledgebase.3com.com, this service gives all

86 APPENDIX C: TECHNICAL SUPPORT

3Com FTP Site Download drivers, patches, software, and MIBs across the Internet from the

3Com public FTP site. This service is available 24 hours a day, 7 days a week.

To connect to the 3Com FTP site, enter the following information into your FTP client:

■ Hostname: ftp.3com.com

■ Username: anonymous

■ Password: <your Internet e-mail address>

You do not need a user name and password with Web browser software such as Netscape Navigator and Internet Explorer.

Support from Your Network Supplier

If you require additional assistance, contact your network supplier. Many suppliers are authorized 3Com service partners who are qualified to provide a variety of services, including network planning, installation, hardware maintenance, application training, and support services.

When you contact your network supplier for assistance, have the following information ready:

■ Product model name, part number, and serial number

■ A list of system hardware and software, including revision levels

■ Diagnostic error messages

■ Details about recent configuration changes, if applicable

If you are unable to contact your network supplier, see the following section on how to contact 3Com.

Support from 3Com 87

Support from 3Com If you are unable to obtain assistance from the 3Com online technical

resources or from your network supplier, 3Com offers technical telephone support services. To find out more about your support options, call the 3Com technical telephone support phone number at the location nearest you.

When you contact 3Com for assistance, have the following information ready:

■ Product model name, part number, and serial number

■ A list of system hardware and software, including revision levels

■ Diagnostic error messages

■ Details about recent configuration changes, if applicable

Here is a list of worldwide technical telephone support numbers. These numbers are correct at the time of publication. Refer to the 3Com Web site for updated information.

Country Telephone Number Country Telephone Number

Asia, Pacific Rim

Australia Hong Kong India

Indonesia Japan Malaysia New Zealand Pakistan Philippines

Europe, Middle East and Africa

From anywhere in these regions, call:

1 800 678 515 800 933 486 +61 2 9937 5085 or 000800 6501111 001 800 61 009 03 5783 1270 1800 801 777 0800 446 398 +61 2 9937 5083 1235 61 266 2602

+44 (0)1442 435529 phone +44 (0)1442 436722 fax

P.R. of China

Singapore S. Korea

Taiwan, R.O.C. Thailand

10800 61 00137 or 021 6350 1590 or 00800 0638 3266 800 6161 463 00798 611 2230 or 02 3455 6455 00798 611 2230 0080 611 261 001 800 611 2000

88 APPENDIX C: TECHNICAL SUPPORT

Country Telephone Number Country Telephone Number

Europe and South Africa

From the following countries, you may use the toll-free numbers:

Austria Belgium Denmark Finland France Germany Hungary Ireland Israel Italy

Latin America

Brazil Mexico

0800 297468 0800 71429 800 17309 0800 113153 0800 917959 0800 1821502 06800 12813 1800 553117 1800 9453794 800 8 79489

0800 13 3266 01 800 849CARE

Luxembourg Netherlands Norway Poland Portugal South Africa Spain Sweden Switzerland U.K.

Puerto Rico Central and South America

0800 3625 0800 0227788 800 11376 00800 3111206 0800 831416 0800 995014 900 983125 020 795482 0800 55 3072 0800 966197

800 666 5065 AT&T +800 998 2112

North America 1 800 NET 3Com

(1 800 638 3266) Enterprise Customers:

1 800 876-3266

Returning Products for Repair 89

Returning Products for Repair

Before you send a product directly to 3Com for repair, you must first obtain an authorization number. Products sent to 3Com without authorization numbers will be returned to the sender unopened, at the sender’s expense. To obtain an authorization number, call or fax:

Country Telephone Number Fax Number

Asia, Pacific Rim + 65 543 6500 + 65 543 6348 Europe, South Africa, and Middle East +44 (0)1442 435529 + 44 (0)1442 436722

Central and South America 525 201 0075

Argentina Bolivia Brazil

Caribbean Chile Colombia Ecuador Mexico Paraguay Peru Uruguay Venezuela

From the following countries, you may call the toll-free numbers; select option 2 and then option 2:

Austria Belgium Denmark Finland France Germany Hungary Ireland Israel Italy Netherlands Norway Poland Portugal South Africa Spain Sweden Switzerland U.K.

U.S.A. and Canada 1 800 NET 3Com

0810 222 3266 511 241 1691 0800 133266 or 55 11 5643 2700 525 201 0004 562 240 6200 525 201 0004 525 201 0004 525 201 0004 525 201 0004 511 241 1691 525 201 0004 525 201 0004

0800 297468 0800 71429 800 17309 0800 113153 0800 917959 0800 1821502 00800 12813 1800553117 1800 9453794 1678 79489 0800 0227788 800 11376 00800 3111206 0800 831416 0800 995014 900 983125 020 795482 0800 55 3072 0800 966197

(1 800 638 3266) Enterprise Customers:

1 800 876 3266

1 408 326 7120 (not toll-free)

90 APPENDIX C: TECHNICAL SUPPORT

INDEX

Numbers

3C number 15 3Com Knowledgebase Web Services 85 3Com URL 85

adding a balance profile 58, 69 adding a cache 57 adding a cache subnet 55 adding a server 64 adding a server subnet 62 adding a service 65 adding a user group 68 ARPS

socket 15 assigning caches to services 57 assigning IP address ranges to user groups 68 assigning servers to services 66

balance profile

adding a balance profile 58, 69 banner of the Web interface 31

cache

adding a cache 57

unassigning the cache from the service 58 cache redirection

configuration example 54 cache subnet

adding a cache subnet 55 caches

assigning caches to services 57

assigning cachess to services 57 choosing a browser 28

downloading the Java Runtime environment 28 choosing the correct cables 20 configuration example of cache redirection 54

configuration example of redundant server load

balancing 46 configuration example of server load balancing 42 configuration methods 33, 35 console port 13 control buttons 34 conventions

notice icons, About This Guide 8 text, About This Guide 8

device view

Web interface 33, 34

downloading

Java Runtime Environment for Internet

Explorer 28

Java Runtime Environment for Netscape

Navigator 29

Ethernet address 15

help view

Web interface 37

information area of the Web interface 31 installing

prerequisites 18

LEDs 14 logical view

assignment buttons 36 assignments buttons 36 Web interface 35

92 INDEX

MAC address 15 MIBs 86

navigation tree of the Web interface 31 network supplier support 86

Online 85

package contents 18 port hotspots 33 ports

console 13 powering-up 21 product name 15

rack mounting 19 redundant server load balancing

configuration example 46 returning products for repair 89

Safety 76 safety information

French 78

German 80 server

adding a server 64

assigning servers to services 66

showing status 66

unassigning the server from the service 66 Server Load Balancer

3C number 15

ARPS socket 15

cable connections 20

console port 13

dimensions 83

Ethernet address 15

installing 18

MAC address 15

package contents 18

power socket, power socket 15

powering-up 21

product name 15 rack mounting 19 serial number, serial number of the Server Load

Balancer 15 size 83 unit information label 15 weight 83

server load balancing

configuration example 42

server subnet

adding a server subnet 62

service

adding a service 65

showing the status of the server 66 socket

ARPS 15

software features

summary 12

specifications, system 83 summary view

Web interface 32

system specifications 83

technical support

3Com Knowledgebase Web Services 85 3Com URL 85 network suppliers 86 product repair 89

unassigning the cache from the service 58 unassigning the server from the service 66 unit hotspots 33 unit information label 15 URL 85 user group

adding a user group 68 assigning IP address ranges 68

Web interface

accessing 30 banner 31 device view 33, 34 exiting 30 help view 37 information area 31 logical view 35 navigation tree 31

summary view 32

World Wide Web (WWW) 85

INDEX 93

94 INDEX

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SUPERSTACK® 3 SERVER LOAD BALANCER (3C16120) SUPERSTACK® 3 SERVER LOAD BALANCER PLUS (3C16121)

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FCC STATEMENT This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to

INFORMATION TO THE USER If this equipment does cause interference to radio or television reception, which can be determined by

part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a com mercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference to radio communications, in which case the user will be required to correct the interference at their own expense.

turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

■ Reorient the receiving antenna.

■ Relocate the equipment with respect to the receiver.

■ Move the equipment away from the receiver.

■ Plug the equipment into a different outlet so that equipment and receiver are on different branch circuits.

If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the following booklet prepared by the Federal Communications Commission helpful:

How to Identify and Resolve Radio-TV Interference Problems

This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4.

In order to meet FCC emissions limits, this equipment must be used only with cables which comply with IEEE

802.3.

CSA STATEMENT This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment

Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

CE STATEMENT (EUROPE) This product complies with the European Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC as

amended by European Directive 93/68/EEC.

Warning: This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.

VCCI STATEMENT

BSMI STATEMENT

HP SuperStack 3 Load Balancer Appliance User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

ABOUT THIS GUIDE

Conventions Table 1 and Table 2 list conventions that are used throughout this guide.

Related Documentation

Product Registration

Documentation Comments

INTRODUCING THE SERVER LOAD BALANCER

About the Server Load Balancer

Server Load Balancer — Front View Detail 13

Ports The Server Load Balancer and Server Load Balancer Plus have twelve

Console Port

LEDs Table 5 lists LEDs visible on the front of the Server Load Balancer, and how

Server Load Balancer — Rear View Detail

Unit Information Label

Power Socket

Advanced Redundant Power System Socket

Downloading 3Com Network Supervisor

INSTALLING THE SERVER LOAD BALANCER

Package Contents Your shipping container should contain the following items:

Choosing a Suitable Site

Rack-mounting 19

Choosing the Correct Cables

Placing Units On Top of Each Other

The Power-up Sequence

Powering-up To power-up the Server Load Balancer, complete the following steps:

Solving Problems Indicated by LEDs

SETTING UP FOR MANAGEMENT

Methods of Managing the Server Load Balancer

Assigning an IP Address

WORKING WITH THE WEB INTERFACE

Choosing a Browser To display the Web interface correctly, use one of the following Web

Accessing the Web Interface

Using the Web Interface

Figure 7 Summary View

Device View The Device View contains a mimic of the Server Load Balancer. The device

Figure 9 Logical View

Figure 10 Help View

Setting up SNMP Management

Upgrading Operating Software

CONFIGURING NON-REDUNDANT SERVER LOAD BALANCING

Server Load Balancing Configuration Example

Configuring for Non-redundant Server Load Balancing

CONFIGURING REDUNDANT SERVER LOAD BALANCING

Redundant Server Load Balancing Configuration Example

Configuring for Active-Passive Redundancy

Configuring for Active-Active Redundancy

Setting Redundancy Settings

CONFIGURING CACHE REDIRECTION

Cache Redirection Configuration Example

Defining a Cache Subnet

Adding a Cache 57

Assigning Caches to Services

Creating a Cache Profile (Optional)

CONFIGURING FOR LOAD BALANCING

Defining a Server Subnet

Changing Lan Port Roles

Adding a Server The servers must first be defined before they can be bound to a particular

Adding a Service 65

Assigning Servers to Service

Adding a User Group

Creating a Balance Profile (Optional)

Modifying Security Filters (Attack Mitigation)

SAFETY INFORMATION

Important Safety Information

L’information de Sécurité Importante

Wichtige Sicherheitsinformat ionen

TECHNICAL SPECIFICATIONS AND PIN-OUTS

Server Load Balancer Specifications

Console Port Cable 9-pin to RS232 25-pin

PC-AT Serial 9-pin to 9-pin

TECHNICAL SUPPORT

Online Technical Services

■ World Wide Web site

■ 3Com Knowledgebase Web Services

3Com FTP Site Download drivers, patches, software, and MIBs across the Internet from the

Support from Your Network Supplier

Support from 3Com 87