3Com 3C16120 User Guide

3Com 3C16120 - SuperStack 3 Server Load Balancer Manual

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  • 3Com 3C16120 | User Guide - Page 1
    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 3C16120 | User Guide - Page 2
    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
  • 3Com 3C16120 | User Guide - Page 3
    CONTENTS ABOUT THIS GUIDE Conventions 8 Related Documentation 9 Product Registration 9 Documentation Comments 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
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    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
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    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
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    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
  • 3Com 3C16120 | User Guide - Page 7
    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
  • 3Com 3C16120 | User Guide - Page 8
    this example, you must supply a password for . 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." If you must press two or more keys simultaneously, the key names are
  • 3Com 3C16120 | User Guide - Page 9
    ® 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
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    10 ABOUT THIS GUIDE
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    3 Server Load Balancer and the SuperStack 3 Server Load Balancer Plus. It covers summaries of the following topics: I About the Server Load Balancer I Server Load Balancer - Front View Detail I Server Load Balancer - Rear View Detail I Downloading 3Com Network Supervisor Unless otherwise noted, the
  • 3Com 3C16120 | User Guide - Page 12
    Server Load Balancer Server Load Balancer Plus I 64 MB for Server Load Balancer Plus I 32 MB for Server Load Balancer Supported Supported I Connects to a SuperStack 3 Advanced Redundant Power System (ARPS) I Installs in a 19-inch rack or stand-alone mounting Summary of Software Table 4 summarizes
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    Transparent mode I Proxy mode Supported I Primary/Secondary I Active/Active Web interface, command line interface, and SNMP supported Server Load Balancer - you to assign the IP address to the Service Load Balancer and provides basic configuration capabilities. For console port pin-out information,
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    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
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    Socket Redundant Power System Socket Unit Information Label The labels on the rear of the unit show the following: I The 3Com product name of the Server Load Balancer I The 3Com 3C number of the Server Load Balancer I The unique MAC address (Ethernet address) of the Server Load Balancer I The
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    Balancer can only use a SuperStack Advanced Redundant Power System output no ON/OFF switch; the only method of connecting or 3Com Network Supervisor You can download 3Com Network Supervisor Version 3.0 from the following Web address: http://www.3com . Features include support for related and
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    On Top of Each Other I The Power-up Sequence I Solving Problems Indicated by LEDs WARNING: Safety Information. Before installing or removing any components you must read the safety information provided in Appendix A of this guide. AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever
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    Load Balancer (3C11620) or Server Load Balancer Plus (3C11621) I User Guide (this guide) I Power Cord I 2 x mounting brackets I 6 x screws 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. I The
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    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
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    Copper Ports Device to Connect: Use this Cable: Another Server Load Balancer, a Crossover cable1 network switch or router End Station (such as a server or Straight-through cable1 a PC) 1 Cables are not supplied by 3Com. Placing Units On Top of Each Other If the units are free-standing, up to
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    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.
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    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
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    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. It covers the following topics: I Methods of Managing the Server Load
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    Manager running the Simple Network Management Protocol (SNMP), such as 3Com Network Supervisor software. SNMP management is limited and does not and subnet mask I 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
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    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
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    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
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    4 WORKING WITH THE WEB INTERFACE This chapter describes how to access and use the web interface. It covers the following topics: I Choosing a Browser I Accessing the Web Interface I Using the Web Interface I Setting up SNMP Management I Upgrading Operating Software
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    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
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    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,
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    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. The main Web interface is displayed. See "Using the Web Interface" on page 31. Exiting the Web You can exit the Web
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    Using the Web Interface 31 Using the Web Interface The Web interface is made up of three areas: I 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
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    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
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    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
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    34 CHAPTER 4: WORKING WITH THE WEB INTERFACE Figure 8 Device View Port Pop-up Menu Navigation Tree Control Buttons 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: I
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    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
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    9 Buttons and their actions Button Action Permissions Displays a matrix of user groups versus virtual services displaying access rights of deny or allow. Server Assignments Displays a matrix of virtual services versus physical servers. This display shows which servers are used for each virtual
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    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
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    running the Simple Network Management Protocol (SNMP), such as 3Com Network Supervisor software. Specifying You can specify SNMP community modify a trap address and its community string. The Server Load Balancer supports the following traps: I Cold Start I Spanning Tree newRoot I Authentication
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    Upgrading Operating Software 39 Upgrading You can upgrade the management software using the Software Upgrade Operating Software 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
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    40 CHAPTER 4: WORKING WITH THE WEB INTERFACE
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    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.
  • 3Com 3C16120 | User Guide - Page 42
    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 Server Load Balancer Port 5 10.20.30.0 VIP: 10.20.30.117 Internet IF1: 10.20.30.116 Port 6 IF2: 192.168.2.254
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    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
  • 3Com 3C16120 | User Guide - Page 44
    IP Settings page appears. The IP Address, Subnet Mask and Default Router fields are completed. This is the information you assigned to the Server you should use, and not the blank default login password. For Technical Support information, see Appendix C. 11 Click Finish. The parameters you have
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    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
  • 3Com 3C16120 | User Guide - Page 46
    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 L2 Switch Subnet 10.20.30.X Port 1 Server Load Balancer 1 IP: 10.20.30.116 Peer IP Address: 10
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    Configuring for Active-Passive Redundancy 47 Configuring for Active-Passive Redundancy 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
  • 3Com 3C16120 | User Guide - Page 48
    Balancer using the new IP address The IP Address, Subnet Mask and Default Router fields are completed. These is the information you assigned to the Server Load should use, and not the blank default login password. For Technical Support information, see Appendix C. 12 Click Next. The Getting Started -
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    Configuring for Active-Active Redundancy 49 Configuring for Active-Active Redundancy 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
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    IP address. 9 The IP Address, Subnet Mask and Default Router fields are completed. These is the information you assigned to the and not the blank default login password. For Technical Support information, see Appendix C. 13 Click Next. The services. See Chapter 8 Configuring for Load Balancing.
  • 3Com 3C16120 | User Guide - Page 51
    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
  • 3Com 3C16120 | User Guide - Page 52
    52 CHAPTER 6: CONFIGURING REDUNDANT SERVER LOAD BALANCING
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    Server Load Balancer. These steps are explained in detail in this chapter: I Defining a Cache Subnet I Non-redundant Configuration I Redundant Configuration I Adding a Cache I Assigning Caches to Services I Creating a Cache Profile (Optional)
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    A request is entered into the browser, for example, http://www.3Com.com. The browser then sends the request to the Server Load 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
  • 3Com 3C16120 | User Guide - Page 55
    Defining a Cache Subnet 55 Defining a Cache Subnet 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 The following steps describe how to create a cache subnet if you are Configuration
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    56 CHAPTER 7: CONFIGURING CACHE REDIRECTION Redundant The following steps describe how to create a cache subnet if you are Configuration 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
  • 3Com 3C16120 | User Guide - Page 57
    types: I Transparent I Proxy 7 Click Done. Assigning Caches to The Assign Caches to Services page is where the caches are assigned to Services cache redirection. The Cache Assignments button is highlighted only if an HTTP service has been created. 1 Click Cache Assignments. The Assign Caches to
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    Showing Status and To view the status of the cache assignments, complete the following Deleting the Cache 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
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    Algorithms and Description Supported Algorithms Destination Round Robin Weighted Round Robin Least Connections Weighted Least Connections Description 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. This is
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    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
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    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
  • 3Com 3C16120 | User Guide - Page 62
    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,
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    a port to which a cache device is connected. I Server Access - Defines a port to which servers are connected, either directly or through a network switch. I Management Access - Defines the port used for management access to the Server Load Balancer. If no Management Access port is specified, you can
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    must first be defined before they can be bound to a particular service. The server is given an arbitrary name (this does not have 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
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    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 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
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    Deleting the Server 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 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
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    (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
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    , 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
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    Creating a Balance Profile (Optional) 69 Accessing You can change user access on specific servers using the Permissions 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
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    11 describes the available algorithms. Table 11 Supported Algorithms and Descriptions Supported Algorithms Description Round Robin Each new connection assigned to the server is assigned using the Assign server to service (Advanced)... window. A weight field is provided. Least Connections
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    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 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. I
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    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
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    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.
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    74 CHAPTER 8: CONFIGURING FOR LOAD BALANCING
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    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
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    I Installation and removal of the unit must be carried out by qualified personnel only. I 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. I Connect the
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    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. I 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
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    curité Importante I L'installation et la dépose de ce groupe doivent être confiés à un personnel qualifié. I 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. I Brancher l'unité à une source
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    de montage en rack ne suffisent pas à eux seuls pour supporter le poids du commutateur. I 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
  • 3Com 3C16120 | User Guide - Page 80
    Wenn die Server Load Balancer Einheit in einer Stapel mit anderen SuperStack 3 Hub Einheiten eingebaut werden soll, muß die Server Load Balancer Gerät angeschlossenen Geräte unter SELV-Bedingungen betrieben werden. I Der Switch darf nur dann in einem Einschub montiert werden, wenn dieser zur
  • 3Com 3C16120 | User Guide - Page 81
    Wichtige Sicherheitsinformationen 81 ACHTUNG: Faseroptikanschlüsse - Optische Sicherheit I Niemals ein Übertragungslaser betrachten, während dieses eingeschaltet ist. Niemals direkt auf den Faser-TX-Anschluß und auf die Faserkabelenden schauen, während diese eingeschaltet sind. I Die Verwendung von
  • 3Com 3C16120 | User Guide - Page 82
    82 APPENDIX A: SAFETY INFORMATION
  • 3Com 3C16120 | User Guide - Page 83
    Kg (14.55 lbs) 0 ° to 40 °C (32 ° to 104 °F) -40 ° to +70 °C (-8 ° to 158 °F) 10-95% relative humidity, non-condensing EN60068 to 3Com schedule (Package testing: paras 2.1, 2.2, 2.30, and 2.32. Operational testing: paras 2.1, 2.2, 2.30 and 2.13). UL 1950, EN60950, CSA 22.2 No. 950, IEC 60950, IEC
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    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
  • 3Com 3C16120 | User Guide - Page 85
    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 3Com offers worldwide product support 24 hours a day, 7 days a week, through the following online systems: I World Wide
  • 3Com 3C16120 | User Guide - Page 86
    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: I Hostname: ftp.3com.com
  • 3Com 3C16120 | User Guide - Page 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. When you
  • 3Com 3C16120 | User Guide - Page 88
    88 APPENDIX C: TECHNICAL SUPPORT Country Telephone Number Country Europe and South Africa From the 0800 13 3266 01 800 849CARE Puerto Rico Central and South America North America 1 800 NET 3Com (1 800 638 3266) Enterprise Customers: 1 800 876-3266 Telephone Number 0800 3625 0800 0227788
  • 3Com 3C16120 | User Guide - Page 89
    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
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    90 APPENDIX C: TECHNICAL SUPPORT
  • 3Com 3C16120 | User Guide - Page 91
    3Com Knowledgebase Web Services 85 3Com URL 85 A 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 About This Guide 8 text, About This Guide 8 D
  • 3Com 3C16120 | User Guide - Page 92
    83 summary view Web interface 32 system specifications 83 T technical support 3Com Knowledgebase Web Services 85 3Com URL 85 network suppliers 86 product repair 89 U unassigning the cache from the service 58 unassigning the server from the service 66 unit hotspots 33 unit information label 15 URL 85
  • 3Com 3C16120 | User Guide - Page 93
    summary view 32 World Wide Web (WWW) 85 INDEX 93
  • 3Com 3C16120 | User Guide - Page 94
    94 INDEX
  • 3Com 3C16120 | User Guide - Page 95
    (3C16120) SUPERSTACK® 3 SERVER LOAD BALANCER PLUS (3C16121) HARDWARE: SOFTWARE: SOFTWARE LICENSE AGREEMENT: 3Com warrants to the end user ("Customer") that this hardware product will be substantially free from material defects in workmanship and materials, under normal use and service, for
  • 3Com 3C16120 | User Guide - Page 96
    subsidiary serving your country, or write: 3Com Corporation Customer Support Information 5400 Bayfront Plaza P.O. Box 58145 Santa Clara, CA 95052-8145 Customer must contact a 3Com Corporate Service Center or an Authorized 3Com Service Center within the applicable warranty period to obtain warranty
  • 3Com 3C16120 | User Guide - Page 97
    THIS WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES in its entirety from application to this Limited Warranty. 3Com Corporation, 5400 Bayfront Plaza, P.O. Box 58145, Santa Clara, CA 95052-8145
  • 3Com 3C16120 | User Guide - Page 98
    upgrades for this product can be downloaded through the 3Com Software Library at http://support.3com.com. REGISTER ONLINE at http://support.3com.com within 30 days of purchase and qualify for the following discretionary services: Free "Next Business Day Delivery" Advance Hardware Replacement for
  • 3Com 3C16120 | User Guide - Page 99
    , if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. Operation of Commission helpful: How to Identify and Resolve Radio-TV Interference Problems This booklet is available from the U.S. Government Printing Office, Washington
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Part No. 990-0049-00
Published June 2001
SuperStack
®
3
Server Load Balancer
Server Load Balancer Plus
User Guide
3C16120
3C16121