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3Com 3C16120 - SuperStack 3 Server Load Balancer, User Manual

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3Com 3C16120 - SuperStack 3 Server Load Balancer User Manual Download Page 59

Creating a Cache Profile (Optional)

59

6

Choose a algorithm. The default algorithm is 

Round-robin

. Table 10 

describes the available algorithms.

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.

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. 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

Round Robin

Each new connection is assigned to the next server in 
the list. This distributes connections evenly between 
the servers.

Weighted Round Robin

Similar to Round Robin, except that 

N

 consecutive new 

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.

Least Connections

Each new connection is assigned to the server having 
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

Weighted Least 
Connections

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

slb_gsg.bk Page 59 Thursday, May 31, 2001 8:57 AM

Summary of Contents for 3C16120 - SuperStack 3 Server Load Balancer

Page 1: ...http www 3com com Part No 990 0049 00 Published June 2001 SuperStack 3 Server Load Balancer Server Load Balancer Plus User Guide 3C16120 3C16121 slb_gsg bk Page 1 Thursday May 31 2001 8 57 AM ...

Page 2: ... 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 Window...

Page 3: ...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 Poweri...

Page 4: ...rings 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 R...

Page 5: ...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 OU...

Page 6: ...ces 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 slb_gsg bk Page 6 Thursday May 31 2001 8 57 AM ...

Page 7: ... 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 slb_gsg bk Page 7 Thursday May 31 2001 8 57 A...

Page 8: ...u must evaluate the syntax 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 The words enter and type When you see the word enter in this guide you must type something and then press Return or Enter Do not press R...

Page 9: ...work Supervisor Product Registration 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 Documentation Comments 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_co...

Page 10: ...10 ABOUT THIS GUIDE slb_gsg bk Page 10 Thursday May 31 2001 8 57 AM ...

Page 11: ...r 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 slb_gsg bk Page 11 Thursday May 31 2001 8 57 AM ...

Page 12: ... Server Load Balancer 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 Software Features Feature Server Load Balancer Server Load Balan...

Page 13: ...lancer and provides basic configuration capabilities For console port pin out information see Appendix B 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 Table 4 Software Features Feature Server Load Balancer Server Load Balancer Plus 1 2 3 4 5 6 7 8 9 1...

Page 14: ... is receiving power and downloading new operating software Off The Server Load Balancer is not receiving power 10 100BASE T Port Status LEDs Packet Yellow 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 Statu...

Page 15: ...ower setting to any supply voltage in the range 90 240 VAC Advanced Redundant Power System Socket 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 redundan...

Page 16: ...s 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 u...

Page 17: ...edures 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 Loa...

Page 18: ...ios 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 ...

Page 19: ... 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 Ser...

Page 20: ...s Ports 1 through 12 use RJ45 connectors Table 6 explains cables to use before connecting a device to the copper ports 1 Cables are not supplied by 3Com Placing Units On Top of Each Other 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 und...

Page 21: ...owing steps 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 che...

Page 22: ...e is still no power you may have a faulty power cord On powering up the Power Self Test LED lights yellow The relevant unit has failed its Power On Self Test POST because of an internal problem Contact your supplier for advice A link is connected and yet the Status LED for the port does not light Check that All connections are secure The devices at both ends of the link are powered up The devices ...

Page 23: ...ging 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 slb_gsg bk Page 23 Thursday May 31 2001 8 57 AM ...

Page 24: ...Protocol SNMP such as 3Com Network Supervisor software SNMP management is limited and does not allow for full configuration functionality Assigning an IP Address 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 com...

Page 25: ...ord 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 ...

Page 26: ...e 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 26 Thursday May 31 2001 8 57 AM ...

Page 27: ...ribes 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 slb_gsg bk Page 27 Thursday May 31 2001 8 57 AM ...

Page 28: ...indows 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 Ja...

Page 29: ...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 s...

Page 30: ...ccess 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 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 pl...

Page 31: ... 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 int...

Page 32: ... 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 ...

Page 33: ...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 wh...

Page 34: ...ce 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 Table 8 Color Key Codes Color Action Green Enabled connected Black Enabled disconnected Gray with connection Disabled connected Gray without connection Disabled disconnected Navigation Tree Port Pop up Menu Un...

Page 35: ...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 u...

Page 36: ...ix 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 service and the operational status of the mappings Cache Assignments Displays a matrix of cache servers This display shows which cache server are used for each virtual service ...

Page 37: ...re 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 slb_gsg bk Page 37 Thursday May 31 2001 8 57 AM ...

Page 38: ...ted to private 5 Click OK Modifying a Trap Address You can modify a trap address and its community string The Server Load Balancer supports the following traps 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...

Page 39: ... 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 Se...

Page 40: ...40 CHAPTER 4 WORKING WITH THE WEB INTERFACE slb_gsg bk Page 40 Thursday May 31 2001 8 57 AM ...

Page 41: ...sses 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 C...

Page 42: ...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 Client Internet Server A 192 168 2 1 Port 80 Server B 192 168 2 2 Port 8080 Server Load Balancer VIP 10 20 30 117 IF1 10 20 30 116 IF2 192 168 2 254 Router Port 1 Port 5 Port 6 10 20 30 0 slb_gsg bk Pa...

Page 43: ...arted 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 slb_gsg bk Page 43 Thursday May 31 2001 8 57 AM ...

Page 44: ...slation 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 ...

Page 45: ...llowing 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 d...

Page 46: ...gure 12 Redundant Server Load Balancing Configuration Example Router L2 Switch L2 Switch Server Load Balancer 1 Server Load Balancer 2 Server A IP 192 168 2 1 Default Gtwy Port 80 Server B IP 192 168 2 2 Default Gtwy Port 8080 Server C IP 192 168 2 3 Default Gtwy Port 80 Subnet 10 20 30 X Port 1 Port 1 Port 12 Port 12 Port 5 Port 5 Floating IP Address 192 168 2 200 Redundant Link IP 10 20 30 116 P...

Page 47: ... 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...

Page 48: ...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 11 Click Next The Getting Started Password page appears CAUTION The Serv...

Page 49: ... 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 Redun...

Page 50: ...o 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 12 Click Next The Getting Started Password page 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...

Page 51: ...played 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 Setting Redundancy Settings Whether you are configured for non redundant or redundant server load balancing if there are multiple Server Load Balancers the Virtual Route...

Page 52: ...52 CHAPTER 6 CONFIGURING REDUNDANT SERVER LOAD BALANCING slb_gsg bk Page 52 Thursday May 31 2001 8 57 AM ...

Page 53: ... 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 slb_gsg bk...

Page 54: ...e 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 c...

Page 55: ...gation 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...

Page 56: ... 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...

Page 57: ...68 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 Servi...

Page 58: ...e the cache from the service 3 Repeat the above steps for each of the servers you have assigned Creating a Cache Profile Optional 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 ...

Page 59: ...Robin Each new connection is assigned to the next server in the list This distributes connections evenly between the servers Weighted Round Robin Similar to Round Robin except that N consecutive new 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 weig...

Page 60: ...formed 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...

Page 61: ...d 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 comp...

Page 62: ...ets 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...

Page 63: ...d 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 ...

Page 64: ...st 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...

Page 65: ...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...

Page 66: ... Status and Deleting the Server 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 ...

Page 67: ...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 ce...

Page 68: ...eep 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 to User Groups 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...

Page 69: ...e 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...

Page 70: ...sent to the server that was least recently sent a new connection Weighted Least Connections 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 Quickest Last Response When a new connection is established between a client and server the ...

Page 71: ...alancer 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...

Page 72: ...ion 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...

Page 73: ...irm Modifying Monitor Access a To modify the monitor access click Modify Monitor The Modify Password page appears b Enter a new password and confirm 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 ...

Page 74: ...74 CHAPTER 8 CONFIGURING FOR LOAD BALANCING slb_gsg bk Page 74 Thursday May 31 2001 8 57 AM ...

Page 75: ... 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 befolg...

Page 76: ...r from the unit by disconnecting the power cord from the outlet U S A and Canada 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 U...

Page 77: ... 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 W...

Page 78: ... ne pouvez mettre l appareil hors circuit qu en débranchant son cordon électrique au niveau de cette prise Etats Unis et Canada 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 ...

Page 79: ...nté 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 AVERTISSEMEN...

Page 80: ... 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 ...

Page 81: ...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 slb_gsg bk Page 81 Thursday May 31 2001 8 57 AM ...

Page 82: ...82 APPENDIX A SAFETY INFORMATION slb_gsg bk Page 82 Thursday May 31 2001 8 57 AM ...

Page 83: ... relative humidity non condensing Standards 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 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 ICES 003 Class A VCCI Class A AS NZS 3548 Class A CNS 13438 Clas...

Page 84: ...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 slb_gsg bk Page 84 Thursday May 31 2001 8 57 AM ...

Page 85: ...cess the latest networking information on the 3Com Corporation 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 3Com Knowledgebase Web Services This interactive ...

Page 86: ... 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 ...

Page 87: ...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 1 800 678 515 800 933 486 61 2 9937 5085 or 000800 6501111 001 800 61 009 03 5783 1270 18...

Page 88: ...489 Luxembourg Netherlands Norway Poland Portugal South Africa Spain Sweden Switzerland U K 0800 3625 0800 0227788 800 11376 00800 3111206 0800 831416 0800 995014 900 983125 020 795482 0800 55 3072 0800 966197 Latin America Brazil Mexico 0800 13 3266 01 800 849CARE Puerto Rico Central and South America 800 666 5065 AT T 800 998 2112 North America 1 800 NET 3Com 1 800 638 3266 Enterprise Customers ...

Page 89: ...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 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 Spa...

Page 90: ...90 APPENDIX C TECHNICAL SUPPORT slb_gsg bk Page 90 Thursday May 31 2001 8 57 AM ...

Page 91: ...ices 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...

Page 92: ...oduct 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 specifica...

Page 93: ...INDEX 93 summary view 32 World Wide Web WWW 85 slb_gsg bk Page 93 Thursday May 31 2001 8 57 AM ...

Page 94: ...94 INDEX slb_gsg bk Page 94 Thursday May 31 2001 8 57 AM ...

Page 95: ...k in combination with any hardware or applications software products provided by third parties that the operation of the software products will be uninterrupted or error free or that all defects in the software products will be corrected For any third party products listed in the 3Com software product documentation or specifications as being compatible 3Com will make reasonable efforts to provide ...

Page 96: ...less of the form or media are held by 3Com and its suppliers TERM AND TERMINATION The licenses granted hereunder are perpetual unless terminated earlier as specified below You may terminate the licenses and this Agreement at any time by destroying the Software and Documentation together with all copies and merged portions in any form The licenses and this Agreement will also terminate immediately ...

Page 97: ...QUENTIAL INDIRECT SPECIAL OR PUNITIVE DAMAGES OF ANY KIND OR FOR LOSS OF REVENUE OR PROFITS LOSS OF BUSINESS LOSS OF INFORMATION OR DATA OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE INSTALLATION MAINTENANCE USE PERFORMANCE FAILURE OR INTERRUPTION OF ITS PRODUCTS EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND LIMITS ITS LIABI...

Page 98: ... of payment acceptable to 3Com to be used if 3Com needs to charge Customer for the replacement as explained below 3Com will make commercially reasonable efforts to ship the replacement product not later than five 5 business days after receiving the request for a replacement or deliver the replacement by the next business day if the customer has registered but may be delayed due to product availabi...

Page 99: ...m 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 ...

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