User manual 3COM SS 3 SERVER LOAD BALANCER

[. . . ] SuperStack® 3 Server Load Balancer Server Load Balancer Plus User Guide 3C16120 3C16121 http://www. 3com. com/ Part No. 990-0049-00 Published June 2001 3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145 Copyright © 2001, 3Com Technologies. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Technologies. 3Com Technologies reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Technologies to provide notification of such revision or change. [. . . ] 2 From the Navigation tree, select Server Load Balancing > Cache Profiles. 5 Enter a descriptive name, such as Cache2, in the Name field. Creating a Cache Profile (Optional) 59 6 Choose a algorithm. Table 10 describes the available algorithms. Table 10 Supported Algorithms and Description Supported Algorithms Destination 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 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 Each new connection is assigned to the next server in the list. 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). . . 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 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 Round Robin Weighted Round Robin Weighted Least Connections 7 Leave Sticky Mode field set to Off. Other available health checks are: I Ping -- Server Load Balancer periodically pings each server using ICMP Echo. If successive ping attempts fail, the server is marked as down and is removed from the pool of available servers. 60 CHAPTER 7: CONFIGURING CACHE REDIRECTION I 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. All Servers are assumed to be operational. I 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: I Period This sets the number of seconds that elapse between health checks. I Retries field This sets the number of retries a health check is attempted. Timeout This sets the number of seconds the Server Load Balancer waits for a reply before the health check is timed out. I 10 Click Next. 11 Click Finish. Your cache profile has been created. 8 CONFIGURING FOR LOAD BALANCING In this chapter the instructions for configuring User Groups, Services and Servers on the Server Load Balancer are explained. The information presented in this chapter is for example purposes only. The information you enter in the fields is specific to your Server Load Balancer. The following is a list of steps for the scenario presented for configuring server load balancing and cache redirection on the Server Load Balancer. These steps explained in detail in this chapter are: I I I I I I I I Defining a Server Subnet Changing Lan Port Roles Adding a Server Adding a Service Assigning Servers to Service Adding a User Group Creating a Balance Profile (Optional) Modifying Security Filters (Attack Mitigation) Before you complete the steps explained in this chapter, you must have completed the preliminary setup described in Chapter 3 Setting Up for Management and in either Chapter 5 Configuring Non-redundant Server Load Balancing or Chapter 6 Configuring Redundant Server Load Balancing. 62 CHAPTER 8: CONFIGURING FOR LOAD BALANCING Defining a Server Subnet Before you can add a server, you need to have defined at least one server subnet. The default gateway of each server must be set to the floating default gateway address of the Server Load Balancer. To define a server subnet, complete the following steps: 1 Click Logical View on the Toolbar. [. . . ] Replacement will be shipped within 5 business days of 3Com receiving the request and is subject to conditions 1 . Free Software Updates will be provided for as long as the original customer owns the product until the product is discontinued by 3Com. All software and firmware upgrades for this product can be downloaded through the 3Com Software Library at http://support. 3com. com. REGISTER ONLINE FOR FREE SERVICE UPGRADE: 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 the first 12 months, and after that, the level offered will be five business days for years 2, 3, 4 and 5 of the life of the product, subject to conditions 1. To check that your product and location qualify for the next business day advance hardware replacement see http://support. 3com. com/registration/docs/hw_repl. html. [. . . ]