SuperStack® 3 Server Load Balancer Server Load Balancer Plus Release Notes 3C16120 3C16121 Software Version A3.5 Release Date June, 2001 http://www.3com.
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.
CONTENTS RELEASE NOTE INFORMATION Overview 5 Product Prerequisites 5 Web Browser Requirements 6 Solaris and Linux Operating Systems 6 Reset To Factory Defaults 6 Configuration Issues 6 Changing Password 7 Committing Configurations 7 Resetting Unit Settings 7 Clock Settings 8 Redundant Configuration Issues 8 Virtual Router Redundancy Protocol Priority Generation Preventing VRID Collisions 9 Restricted Management Topology 10 Changing Redundancy Types 10 System Clock 11 Service Access Permissions 11 Balance
TECHNICAL SUPPORT Online Technical Services 1 World Wide Web Site 1 3Com Knowledgebase Web Services 1 3Com FTP Site 2 Support from Your Network Supplier 2 Support from 3Com 2 Returning Products for Repair 4
RELEASE NOTE INFORMATION Overview These release notes cover the Server Load Balancer (3C16120) and the Server Load Balancer Plus (3C16121). Before using your Server Load Balancer and Server Load Balancer Plus, please read this document in its entirety. It contains important information about the product and the software. 3Com provides easy access to technical support information through a variety of services. See Technical Support on page 1.
RELEASE NOTE INFORMATION Balancer Plus. If the JRE program is missing, you will be prompted to install it. See the Server Load Balancer and Server Load Balancer Plus User Guide for information. For an up to date list of supported operating systems and browser releases, refer to the 3Com Web site at http://www.3Com.com. Click Support for Products for more information. Web Browser Requirements The Web Interface requires a Web browser such as Netscape Navigator® version 4.
Configuration Issues Changing Password 7 The Server Load Balancer and Server Load Balancer Plus provide 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 The Server Load Balancer does not provide a way to recover a lost password.
RELEASE NOTE INFORMATION Redundant Configuration When resetting Device A, the primary IP addresses (for both Device A & Device B), the subnet mask and the default router settings are preserved. The device redundancy setting is set to none and Device B synchronizes to this configuration setting. When Device B discovers that it is no longer part of a redundant configuration, all of the settings are reset to factory defaults including the primary IP address, subnet mask and default router.
Redundant Configuration Issues 9 Table 1 depicts the contributing values used for the various network connectivity components monitored by the Server Load Balancer and Server Load Balancer Plus: Table 1 Contributing Values of Monitored Components Source Meaning Contribution Client Role Port One or more ports with client access role in the forwarding state 10 points Server Role Port One or more ports with server access role in the forwarding state 10 points Default Router The default router is 15
RELEASE NOTE INFORMATION In some cases, these identifiers could collide with either another Server Load Balancer and Server Load Balancer Plus or with other network devices that are taking part in the VRRP protocol. As a result, it may be necessary to override the VRIDs used by the Server Load Balancer and Server Load Balancer Plus. To override these values, you must be at the Logical View and complete the following: 1 Select Server Load Balancing > Redundancy Setting from the Navigation tree.
System Clock System Clock 11 The time settings may get lost when power is removed from the device for durations greater than 30 days. Following an initial installation or whenever power is removed from the device for an extended period of time, it is recommended that the time setting be verified. The time setting can be viewed using the show clock command in the CLI. If the time is not accurate, the proper time setting can be defined using the set clock command.
RELEASE NOTE INFORMATION See the Server Load Balancer and Server Load Balancer Plus User Guide for information. Server Network Address Translation The Server Load Balancer and Server Load Balancer Plus allows for a network address to be specified for translation when a server initiates a connection to the external network. The intent of this feature is to allow application servers to retrieve content from external locations of the network that they are connected to.
Software Upgrades 13 Table 2 describes the backoff delay times for each retry: Table 2 Retry and Backoff Time Retry Backoff Delay Initial Attempt N/A First 8 seconds Second 16 seconds Third 32 seconds Fourth 1 minute Fifth 1 minute Final 1 minute Once the Server Load Balancer and Server Load Balancer Plus have backed off the timeout, it will never go back down again.
RELEASE NOTE INFORMATION
TECHNICAL SUPPORT 3Com provides easy access to technical support information through a variety of services. This section describes these services. Information contained in this section is correct at time of publication. For the most recent information, 3Com recommends that you access the 3Com Corporation World Wide Web site.
2 TECHNICAL SUPPORT 3Com FTP Site Download drivers, patches, software, and MIBs across the Internet from the 3Com public FTP site. This service is available 24 hours a day, 7 days a week. To connect to the 3Com FTP site, enter the following information into your FTP client: ■ Hostname: ftp.3com.com ■ Username: anonymous ■ Password: You do not need a user name and password with Web browser software such as Netscape Navigator and Internet Explorer.
Support from 3Com ■ A list of system hardware and software, including revision levels ■ Diagnostic error messages ■ Details about recent configuration changes, if applicable 3 Here is a list of worldwide technical telephone support numbers. These numbers are correct at the time of publication. Refer to the 3Com Web site for updated information. Table 1 Support Numbers Country Telephone Number Country Telephone Number P.R.
4 TECHNICAL SUPPORT 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.
Returning Products for Repair Table 2 Numbers to Call for Authorization Country Telephone Number Fax Number U.S.A.
6 TECHNICAL SUPPORT
