slb_gsg.bk Page 1 Thursday, May 31, 2001 8:57 AM SuperStack® 3 Server Load Balancer Server Load Balancer Plus User Guide 3C16120 3C16121 http://www.3com.com/ Part No.
slb_gsg.bk Page 2 Thursday, May 31, 2001 8:57 AM 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.
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slb_gsg.bk Page 7 Thursday, May 31, 2001 8:57 AM ABOUT THIS GUIDE This guide provides all the information you need to install and use a SuperStack ® 3 Server Load Balancer (3C16120) or the SuperStack 3 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.
slb_gsg.bk Page 8 Thursday, May 31, 2001 8:57 AM 8 ABOUT THIS GUIDE Conventions Table 1 and Table 2 list conventions that are used throughout this guide. Table 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 potential damage to an application, system, or device. Warning Information that alerts you to potential personal injury.
slb_gsg.bk Page 9 Thursday, May 31, 2001 8:57 AM Related Documentation Related Documentation 9 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.
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slb_gsg.bk Page 11 Thursday, May 31, 2001 8:57 AM 1 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.
slb_gsg.bk Page 12 Thursday, May 31, 2001 8:57 AM 12 CHAPTER 1: INTRODUCING THE SERVER LOAD BALANCER About the Server Load Balancer Summary of Hardware 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.
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slb_gsg.bk Page 14 Thursday, May 31, 2001 8:57 AM 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. Table 5 LED Behavior LED Color Indicates Power/Self Test LED Yellow The Server Load Balancer has failed its Power On Self Test (POST) or a failure is detected in the runtime. Yellow flashing The Server Load Balancer is running POST. Off No fault has been detected.
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slb_gsg.bk Page 16 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 17 Thursday, May 31, 2001 8:57 AM 2 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.
slb_gsg.bk Page 18 Thursday, May 31, 2001 8:57 AM 18 CHAPTER 2: INSTALLING THE SERVER LOAD BALANCER Package Contents Choosing a Suitable Site 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 The Server Load Balancer is suited for use where it can be mounted in a standard 19-inch equipment rack, or free-standing.
slb_gsg.bk Page 19 Thursday, May 31, 2001 8:57 AM Rack-mounting Rack-mounting 19 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.
slb_gsg.bk Page 20 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 21 Thursday, May 31, 2001 8:57 AM The Power-up Sequence The Power-up Sequence 21 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.
slb_gsg.bk Page 22 Thursday, May 31, 2001 8:57 AM 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. Table 7 Problems Indicated by LEDs Problem Suggested Solution The Power LED does not light Check that the power cable is firmly connected to the relevant unit and to the supply outlet.
slb_gsg.bk Page 23 Thursday, May 31, 2001 8:57 AM 3 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.
slb_gsg.bk Page 24 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 25 Thursday, May 31, 2001 8:57 AM Assigning an IP Address 25 3 Hit . 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 .
slb_gsg.bk Page 26 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 27 Thursday, May 31, 2001 8:57 AM 4 WORKING WITH THE WEB INTERFACE This chapter describes how to access and use the web interface.
slb_gsg.bk Page 28 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 29 Thursday, May 31, 2001 8:57 AM Choosing a Browser Installing the JRE for Netscape Navigator 29 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.
slb_gsg.bk Page 30 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 31 Thursday, May 31, 2001 8:57 AM Using the Web Interface Using the Web Interface 31 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.
slb_gsg.bk Page 32 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 33 Thursday, May 31, 2001 8:57 AM Using the Web Interface Device View 33 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.
slb_gsg.bk Page 34 Thursday, May 31, 2001 8:57 AM 34 CHAPTER 4: WORKING WITH THE WEB INTERFACE Figure 8 Device View Control Buttons Port Pop-up Menu Unit Pop-up Menu Navigation Tree 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.
slb_gsg.bk Page 35 Thursday, May 31, 2001 8:57 AM Using the Web Interface Logical View 35 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.
slb_gsg.bk Page 36 Thursday, May 31, 2001 8:57 AM 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. Table 9 Buttons and their actions Button Action Permissions Displays a matrix of user groups versus virtual services displaying access rights of deny or allow.
slb_gsg.bk Page 37 Thursday, May 31, 2001 8:57 AM Using the Web Interface Help View 37 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.
slb_gsg.bk Page 38 Thursday, May 31, 2001 8:57 AM 38 CHAPTER 4: WORKING WITH THE WEB INTERFACE Setting up SNMP Management Specifying Community Strings 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.
slb_gsg.bk Page 39 Thursday, May 31, 2001 8:57 AM Upgrading Operating Software Upgrading Operating Software 39 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.
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slb_gsg.bk Page 41 Thursday, May 31, 2001 8:57 AM 5 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.
slb_gsg.bk Page 42 Thursday, May 31, 2001 8:57 AM 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 Router Port 1 10.
slb_gsg.bk Page 43 Thursday, May 31, 2001 8:57 AM Configuring for Non-redundant Server Load Balancing Configuring for Non-redundant Server Load Balancing 43 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.
slb_gsg.bk Page 44 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 45 Thursday, May 31, 2001 8:57 AM 6 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.
slb_gsg.bk Page 46 Thursday, May 31, 2001 8:57 AM 46 CHAPTER 6: CONFIGURING REDUNDANT SERVER LOAD BALANCING Redundant Server Load Balancing Configuration Example 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.
slb_gsg.bk Page 47 Thursday, May 31, 2001 8:57 AM Configuring for Active-Passive Redundancy Configuring for Active-Passive Redundancy 47 You must complete the 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.
slb_gsg.bk Page 48 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 49 Thursday, May 31, 2001 8:57 AM Configuring for Active-Active Redundancy Configuring for Active-Active Redundancy 49 You must complete the 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.
slb_gsg.bk Page 50 Thursday, May 31, 2001 8:57 AM 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. 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.
slb_gsg.bk Page 51 Thursday, May 31, 2001 8:57 AM Setting Redundancy Settings Active-Active Device Allocation 51 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.
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slb_gsg.bk Page 53 Thursday, May 31, 2001 8:57 AM 7 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.
slb_gsg.bk Page 54 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 55 Thursday, May 31, 2001 8:57 AM Defining a Cache Subnet Defining a Cache Subnet 55 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. Non-redundant Configuration 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.
slb_gsg.bk Page 56 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 57 Thursday, May 31, 2001 8:57 AM Adding a Cache Adding a Cache 57 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.
slb_gsg.bk Page 58 Thursday, May 31, 2001 8:57 AM 58 CHAPTER 7: CONFIGURING CACHE REDIRECTION Showing Status and Deleting the Cache 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.
slb_gsg.bk Page 59 Thursday, May 31, 2001 8:57 AM Creating a Cache Profile (Optional) 59 6 Choose a algorithm. The default algorithm is Round-robin. Table 10 describes the available algorithms. Table 10 Supported Algorithms and Description Supported Algorithms Description Destination The Destination IP address of the client's packets is hashed and used as an index to an array of active servers bound to the service.
slb_gsg.bk Page 60 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 61 Thursday, May 31, 2001 8:57 AM 8 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.
slb_gsg.bk Page 62 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 63 Thursday, May 31, 2001 8:57 AM Changing Lan Port Roles Changing Lan Port Roles 63 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.
slb_gsg.bk Page 64 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 65 Thursday, May 31, 2001 8:57 AM Adding a Service Adding a Service 65 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.
slb_gsg.bk Page 66 Thursday, May 31, 2001 8:57 AM 66 CHAPTER 8: CONFIGURING FOR LOAD BALANCING Assigning Servers to Service 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.
slb_gsg.bk Page 67 Thursday, May 31, 2001 8:57 AM Assigning Servers to Service Assigning Server to Services (Advanced) 67 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.
slb_gsg.bk Page 68 Thursday, May 31, 2001 8:57 AM 68 CHAPTER 8: CONFIGURING FOR LOAD BALANCING Adding a User Group 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.
slb_gsg.bk Page 69 Thursday, May 31, 2001 8:57 AM Creating a Balance Profile (Optional) Accessing Permissions 69 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.
slb_gsg.bk Page 70 Thursday, May 31, 2001 8:57 AM 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. Table 11 Supported Algorithms and Descriptions Supported Algorithms Description Round Robin Each new connection is assigned to the next server in the list. This distributes connections evenly between the servers.
slb_gsg.bk Page 71 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 72 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 73 Thursday, May 31, 2001 8:57 AM Modifying Security Filters (Attack Mitigation) Modifying User Access 73 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.
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slb_gsg.bk Page 75 Thursday, May 31, 2001 8:57 AM A 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.
slb_gsg.bk Page 76 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 77 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 78 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 79 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 80 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 81 Thursday, May 31, 2001 8:57 AM 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.
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slb_gsg.bk Page 83 Thursday, May 31, 2001 8:57 AM B Server Load Balancer Specifications TECHNICAL SPECIFICATIONS AND PIN-OUTS The following table lists the technical specifications for the Server Load Balancer and the Server Load Balancer Plus: Physical Dimensions Height: 65.8 mm (2.59 in.) x Width: 440 mm (17.3 in.) x Depth: 368.4 mm (14.5 in.). Weight: 6.6 Kg (14.
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slb_gsg.bk Page 85 Thursday, May 31, 2001 8:57 AM C 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.
slb_gsg.bk Page 86 Thursday, May 31, 2001 8:57 AM 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.
slb_gsg.bk Page 87 Thursday, May 31, 2001 8:57 AM Support from 3Com Support from 3Com 87 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.
slb_gsg.bk Page 88 Thursday, May 31, 2001 8:57 AM 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 0800 297468 0800 71429 800 17309 0800 113153 0800 917959 0800 1821502 06800 12813 1800 553117 1800 9453794 800 8 79489 Luxembourg Netherlands Norway Poland Portugal South Africa Spain Sweden Switzerland U.
slb_gsg.bk Page 89 Thursday, May 31, 2001 8:57 AM Returning Products for Repair 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.
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slb_gsg.bk Page 95 Thursday, May 31, 2001 8:57 AM 3Com Corporation LIFETIME LIMITED WARRANTY The 3Com Corporation Limited Warranty and the Other Services described in this document supersede any such information that may be contained within your product user documentation. This warranty applies to customers located in the United States, Australia, Canada (except Quebec), Ireland, New Zealand, U.K.
slb_gsg.bk Page 96 Thursday, May 31, 2001 8:57 AM ASSIGNMENT; NO REVERSE ENGINEERING: You may transfer the Software, Documentation and the licenses granted herein to another party in the same country in which you obtained the Software and Documentation if the other party agrees in writing to accept and be bound by the terms and conditions of this Agreement.
slb_gsg.bk Page 97 Thursday, May 31, 2001 8:57 AM WARRANTIES EXCLUSIVE: IF THIS 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER'S SOLE REMEDY FOR BREACH OF THIS WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S OPTION.
slb_gsg.bk Page 98 Thursday, May 31, 2001 8:57 AM OTHER SERVICES 3COM RESERVES THE RIGHT TO MODIFY OR CANCEL THESE SERVICES AT ANY TIME, WITHOUT ADVANCE NOTICE. THESE SERVICES ARE NOT AVAILABLE WHERE PROHIBITED OR RESTRICTED BY LAW. THESE SERVICES APPLY TO THE ORIGINAL CUSTOMER ONLY. Free Advanced Hardware Replacement for 5 Years from date of purchase. Replacement will be shipped within 5 business days of 3Com receiving the request and is subject to conditions 1 .
slb_gsg.bk Page 99 Thursday, May 31, 2001 8:57 AM REGULATORY NOTICES FCC STATEMENT This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
