® SuperStack® II Switch 3000 TX 8 Port User Guide Agent Software Version 3.1 http://www.3com.com/ Document No.
3Com Corporation ■ 5400 Bayfront Plaza Copyright © 3Com Ireland, 1997. 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 permission from 3Com Ireland. 3Com Ireland reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Ireland to provide notification of such revision or change.
CONTENTS Redundant Power System Socket 1-9 Reset Button 1-9 Console Port 1-9 Plug-in Module Slot 1-9 Ethernet Address 1-9 Unit Defaults 1-10 Managing the Switch 3000 TX 1-10 Quick Start For SNMP Users 1-11 Entering an IP Address for the Switch 1-11 ABOUT THIS GUIDE Introduction 1 How to Use This Guide 1 Conventions 2 Related Documentation 2 1 GETTING STARTED About the Switch 3000 TX 1-1 Summary of Features 1-1 Port Connections 1-2 100BASE-TX Ports 1-2 Plug-in Module 1-2 Switch Operation and Features 1-2
3 Methods of Managing the Switch 3000 TX 3-1 Using the VT100 Management Interface 3-1 Using Telnet 3-2 Managing Over The Network 3-2 IP Addresses 3-2 Obtaining a Registered IP Address 3-3 Navigating the VT100 Screens 3-4 Screen Conventions 3-4 Keyboard Shortcuts 3-5 Correcting Text Entry 3-5 Setting up the Switch for Management 3-6 Logging On 3-6 After Logging On 3-8 Switch Management Setup 3-9 Logging Off 3-12 Auto Logout 3-12 4 Adding an Entry into the SDB 4-17 Deleting an Entry from the SDB 4-17 Speci
Setting Up VLANs on the Switch 5-8 Assigning a Port to a VLAN When Using Port VLAN Mode 5-9 Specifying that a Port is a VLT port 5-9 Setting Up VLANs Using AutoSelect VLAN Mode 5-10 Specifying Information About the VLAN Server 5-10 Specifying AutoSelect VLAN Mode 5-11 Spanning Tree Protocol 5-12 What is STP? 5-12 How STP Works 5-14 STP Initialization 5-14 STP Stabilization 5-14 STP Reconfiguration 5-14 An Example 5-15 STP Configurations 5-16 Enabling STP on the Switch 5-17 Configuring STP on the Switch 5-18
C TROUBLE-SHOOTING LEDs C-1 Using the VT100 Interface C-2 Using the Switch C-3 D PIN-OUTS Null Modem Cable D-1 PC-AT Serial Cable D-1 Modem Cable D-2 RJ45 Pin Assignments D-2 E SWITCH 3000 TX TECHNICAL SPECIFICATIONS F TECHNICAL SUPPORT Online Technical Services F-1 World Wide Web Site F-1 3Com Bulletin Board Service F-1 Access by Analog Modem F-1 Access by Digital Modem F-2 3ComFacts Automated Fax Service F-2 3ComForum on CompuServe Online Service F-2 Support from Your Network Supplier F-3 Support f
ABOUT THIS GUIDE About This Guide provides an overview of this guide, describes the guide conventions, tells you where to look for specific information and lists other publications that may be useful. How to Use This Guide This table shows where to find specific information in this guide. If you are looking for... Turn to... An overview of the Switch Chapter 1 This guide provides the information you need to install and configure the Switch 3000 TX 8 Port (3C16941A) with v3.1 agent software.
2 ABOUT THIS GUIDE Table 2 Conventions Notice Icons Icon Table 1 and Table 2 list conventions that are used throughout this guide. Table 1 Text Conventions Convention Description Screen displays This typeface represents information as it appears on the screen. The words “enter” and “type” When you see the word “enter” in this guide, you must type something, and then press the Return or Enter key. Do not press the Return or Enter key when an instruction simply says “type.
1 GETTING STARTED ■ Full Duplex on all fixed ports, and Fast Ethernet Plug-in Module ports ■ Resilient Links ■ Support for 16 Virtual LANs (VLANs) ■ Spanning Tree Protocol (STP) per VLAN ■ PACE (Priority Access Control Enabled) for supporting multimedia applications over Ethernet ■ 3Com’s SuperStack II architecture: About the Switch 3000 TX Switching is currently a leading option for increasing performance by providing high speed backbone links and eliminating server bottlenecks.
1-2 CHAPTER 1: GETTING STARTED Port Connections the device from generating more packets until the period of congestion ends. 100BASE-TX Ports The Switch has eight Fast Ethernet 100BASE-TX ports configured as MDIX (cross-over), which provide a 100Mbps connection to other Fast Ethernet devices such as the SuperStack II Switch 1000. The maximum segment length is 100m (328ft) over category 5 twisted pair cable.
About the Switch 3000 TX Virtual LANs (VLANs) The Switch 3000 TX has a Virtual LAN (VLAN) feature which allows you to build your network segments without being restricted by physical connections. A VLAN is defined as a group of location- and topology-independent devices that communicate as if they are on the same physical LAN. Implementing VLANs on your network has three main advantages: ■ It eases the change and movement of devices on IP networks.
1-4 CHAPTER 1: GETTING STARTED Network Configuration Examples The following two illustrations show some examples of how the Switch 3000 TX can be used on your network. Figure 1-1 The Switch 3000 TX used as a data-center switch Examples of how the Switch 3000 TX can be used in a VLAN-based network are given in Chapter 5.
Network Configuration Examples Figure 1-2 Increasing port density with the Switch 3000 TX 1-5
1-6 CHAPTER 1: GETTING STARTED Unit Overview — Front Figure 1-3 Switch 3000 TX front view
Unit Overview — Front 100BASE-TX Ports The Switch 3000 TX has eight Fast Ethernet 100BASE-TX RJ45 ports configured as MDIX (cross-over), which provide connection to other Fast Ethernet devices such as the SuperStack II Switch 1000. The maximum segment length is 100m (328ft) over category 5 UTP or STP cable. As these ports are configured as MDIX (cross-over), you need to use a cross-over cable to connect to devices whose ports are MDIX-only. Most of the 100BASE-TX ports in 3Com devices are MDIX-only.
1-8 CHAPTER 1: GETTING STARTED Unit Overview — Rear Figure 1-4 Switch 3000 TX rear view
Unit Overview — Rear Power Socket The Switch 3000 TX automatically adjusts to the supply voltage. The fuse is suitable for both 110V A.C. and 220–240V A.C. operation. For information on replacing fuses, refer to Appendix A. Unit Serial Number You may need this serial number for fault reporting purposes. Redundant Power System Socket Use one of these sockets to connect a SuperStack II Redundant Power System (RPS) to the unit. You can use either socket.
1-10 CHAPTER 1: GETTING STARTED Unit Defaults Managing the Switch 3000 TX The following table shows the factory defaults for the Switch 3000 TX features.
Quick Start For SNMP Users 1-11 3 At the Main Banner screen, press [Return] to dis- Quick Start For SNMP Users This section describes how to get started if you want to use an SNMP Network Manager to manage the Switch. It assumes you are already familiar with SNMP management. ■ ■ ■ If you are using IP and you have a BOOTP server set up correctly on your network, the IP address for the Switch is detected automatically and you can start managing the Switch without any further configuration.
1-12 CHAPTER 1: GETTING STARTED
2 INSTALLATION AND SETUP ■ Water or moisture cannot enter the case of the unit. ■ Air-flow around the unit and through the vents in the side of the case is not restricted. We recommend that you provide a minimum 25mm (1in.) clearance. ■ No objects are placed on top of the unit. ■ Units are not stacked more than four high if free-standing.
2-2 CHAPTER 2: INSTALLATION AND SETUP Configuration Rules for Fast Ethernet Configuration Rules with Full Duplex The topology rules for 100Mbps Fast Ethernet are slightly different to those for 10Mbps Ethernet. Figure 2-1 illustrates the key topology rules and provides examples of how they allow for large-scale Fast Ethernet networks. The Switch 3000 TX provides full duplex support for all its fixed ports, and Fast Ethernet Plug-in Module ports.
Configuration Rules with Full Duplex Figure 2-1 Fast Ethernet configuration rules 2-3
2-4 CHAPTER 2: INSTALLATION AND SETUP 3 Insert the three screws and fully tighten with a suit- Installing the Switch 3000 TX Rack Mounting The Switch is 1.5U high and fits in most standard 19-inch racks. CAUTION: Disconnect all cables from the Switch before continuing. Remove all self adhesive pads from the underside of the unit, if fitted. 1 Place the unit the right way up on a hard flat sur- face, with the front facing towards you.
Installing the Switch 3000 TX Wall Mounting A single Switch can be wall-mounted. CAUTION: Disconnect any cables from the unit before continuing. Remove self-adhesive pads from the underside of the unit if they have been previously fitted. 1 Place the Switch the right way up on a hard flat sur- face, with the front facing towards you. 2 Locate a mounting bracket over the mounting holes on one side of the unit, as shown in Figure 2-3. 3 Insert the two screws and tighten with a suitable screwdriver.
2-6 CHAPTER 2: INSTALLATION AND SETUP Powering-Up the Switch 1 Connect the power cord to the IEC socket on the rear of the Switch, and to your mains socket. The Switch has no ON/OFF switch; the only method of connecting or disconnecting mains power is through the power cord. 2 The Switch enters a Power On Self Test (POST). The time taken for the test to complete is dependent on the type of POST configured (refer to “Switch Management Setup” on page 3-9 for details of how to configure the type of POST).
Connecting Equipment to the Console Port Connecting Equipment to the Console Port The Switch console port settings are set to: ■ 8 data bits ■ no parity ■ 1 stop bit The terminal connected to the console port on the Switch must be configured with the same settings. This procedure is described in the documentation supplied with the terminal. If you have enabled auto-configuration for the Switch, the terminal’s line speed (baud rate) is detected automatically.
2-8 CHAPTER 2: INSTALLATION AND SETUP Connecting a Workstation Running SLIP You can communicate with the Switch via the console port from a workstation running SLIP (Serial Line Internet Protocol). In this way, you can perform out-of-band management using Telnet or SNMP. Cables required for this connection depend on the type of workstation you are using. You must configure the workstation to run SLIP. Refer to the documentation supplied with the workstation for more details.
3 SETTING UP FOR MANAGEMENT Methods of Managing the Switch 3000 TX You can manage the Switch in four ways: ■ Using the VT100 interface by connecting a VT100 terminal (or workstation with terminal emulation software) to the Switch console port. ■ Using the VT100 interface over a TCP/IP network using a workstation running VT100 terminal emulation and Telnet. ■ Using the VT100 interface by connecting a workstation running SLIP to the Switch console port.
3-2 CHAPTER 3: SETTING UP FOR MANAGEMENT Using Telnet Any Telnet facility that emulates a VT100 terminal should be able to communicate with the Switch over a TCP/IP network. Up to three active Telnet sessions can access the Switch concurrently. If a connection to a Telnet session is lost inadvertently, the connection is closed by the Switch after 2–3 minutes of inactivity. Before you can start a Telnet session you must set up the IP parameters described in “Switch Management Setup” on page 3-9.
Managing Over The Network If your network is internal to your organization only, you may use any arbitrary IP address. We suggest you use addresses in the series 191.100.X.Y, where X and Y are numbers between 1 and 254. Use 191.101.X.Y for the SLIP address. If your network has a connection to the external IP network, you will need to apply for a registered IP address.
3-4 CHAPTER 3: SETTING UP FOR MANAGEMENT Navigating the VT100 Screens Screen Conventions To differentiate types of information, the VT100 screens use the following conventions: Type of information Shown on screen as... Description Choice Field ♦text♦ Text enclosed with markers is a list from which you can select one option only. Press the spacebar to cycle through the options. Press [Down Arrow] or [Return] to move to the next field.
Navigating the VT100 Screens Keyboard Shortcuts There are several special characters or combinations of characters that allow you to make shortcuts: [Tab] allows you to move from one field to the next, on any screen without making any changes. [Return] moves you to the next field on a form after you have made changes to the data in a field. [Left Arrow] moves you to the previous field on the screen or the next character in an editable field.
3-6 CHAPTER 3: SETTING UP FOR MANAGEMENT Setting up the Switch for Management The following sections describe how to get started if you want to use an SNMP Network Manager to manage the Switch. It assumes you are already familiar with SNMP management. If not, we recommend the following publication: “The Simple Book” by Marshall T.
Setting up the Switch for Management ■ If you have been assigned a user name and password, enter those details. ■ If you are logging on for the first time (after installation or initialization), use a default user name and password to match your access requirements. The defaults are shown in Table 3-1. If you are setting up the Switch for management, we suggest that you log on first as admin.
3-8 CHAPTER 3: SETTING UP FOR MANAGEMENT After Logging On When you have successfully logged on to the Switch, the Main Menu screen is displayed as shown in Figure 3-3. From here, you can select the options needed to manage the unit. Refer to the screen map on page 4-1. If you have installed an ATM OC-3c Module into the Switch, the Main Menu screen contains an ATM CONFIGURATION option. Refer to the “SuperStack II Switch STM OC-3c Module User Guide” for more information.
Setting up the Switch for Management 3-9 Switch Management Setup The Management Setup screen allows you to configure IP, IPX, and SLIP parameters for the Switch. This screen also allows you to display screens for setting up the console port and traps. To access the Setup screen, from the Switch Main Menu screen, select the MANAGEMENT SETUP option. The Setup screen is displayed, as shown in Figure 3-4. If you change some of the following parameters, the Switch must be reset for the change to take effect.
3-10 CHAPTER 3: SETTING UP FOR MANAGEMENT If you suspect that there is a problem with the Switch that has not been detected by the Normal tests, set this field to Extended and reset the Switch (refer to “Resetting the Switch 3000 TX” on page 4-26). SLIP Address If you are using SLIP, enter an address that has a network part different to the network address of the Switch. For more information, contact your network administrator. You must reset the Switch after changing this parameter.
Setting up the Switch for Management CONSOLE PORT Select this button to display the setup screen for console port parameters. Console port setup is described in “Setting up the Console Port” on page 4-24.
3-12 CHAPTER 3: SETTING UP FOR MANAGEMENT Logging Off If you have finished using the VT100 management interface, select the LOGOFF option from the bottom of the main menu. If you accessed the VT100 management interface using a Telnet session or modem connection, the connection is closed automatically. Auto Logout There is a built-in security timeout on the VT100 interface. If you do not press any keys for 3 minutes, the management facility warns you that the inactivity timer is about to expire.
4 MANAGING THE SWITCH 3000 TX Chapters 4 and 5 describe all management facilities for the Switch. While following steps in these chapters, you may find the screen map below useful: Figure 4-1 Screen map If an ATM OC-3c Module is installed in the Switch, extra screens are available. Refer to the “SuperStack® II Switch ATM OC-3c Module User Guide” for more information.
4-2 CHAPTER 4: M ANAGING THE SWITCH 3000 TX Setting Up Users From the Main Menu, select USER ACCESS LEVELS. The User Access Levels screen is displayed as shown in Figure 4-2. From this screen you can access: ■ LOCAL SECURITY screen — This allows you to set up access levels for users on the Switch. ■ CREATE USER screen — This allows you to create up to 10 users in addition to the default users set up on the Switch. ■ DELETE USERS screen — This allows you to delete users from the Switch.
Creating a New User 4-3 Creating a New User These steps assume the User Access Levels screen is displayed. 1 Select the CREATE USER option. The Create User screen is displayed, as shown in Figure 4-3. 2 Fill in the fields and assign an access level for the new user. 3 When the form is complete, select OK. The Create User screen shows the following fields: Figure 4-3 User Name Type in the name of the new user. The name can consist of up to 10 characters and is case-sensitive.
4-4 CHAPTER 4: M ANAGING THE SWITCH 3000 TX Deleting a User These steps assume the User Access Levels screen is displayed. 1 Select the DELETE USERS option. The Delete Users screen is displayed as shown in Figure 4-4. 2 Use the spacebar to highlight the user that you want to delete. Note that you cannot delete default users or the current user (that is, yourself). 3 Select DELETE USERS.
Editing User Details Editing User Details These steps assume the User Access Levels screen is displayed. 1 Select the EDIT USER option. The Edit User screen is displayed, as shown in Figure 4-5. 2 Fill in the fields as required. 3 When you have completed the changes, select OK. The Edit User screen shows the following fields: User Name This read-only field shows the name of the user. This field cannot be changed; if you need to change the user name, you must delete the user and create a new one.
4-6 CHAPTER 4: M ANAGING THE SWITCH 3000 TX Assigning Local Security The Local Security screen shows a matrix of options for access method (Console Port, Remote Telnet, Community-SNMP) and access level. These steps assume the User Access Levels screen is displayed. 1 Select the LOCAL SECURITY option. The Local Secu- rity screen is displayed, as shown in Figure 4-6. 2 Fill in the fields as required. 3 When you have filled in the form, select OK.
Choosing a Switch Management Level Choosing a Switch Management Level The Switch Management screen allows you to: ■ Choose between managing a port, the unit, or a VLAN ■ Display screens for setting up the Switch ■ Display a screen for managing the Switch Database ■ Display screens for managing resilient links ■ Display screens for managing STP ■ Display screens showing statistics Figure 4-7 Switch Management screen for Port level Figure 4-8 Switch Management screen for Unit level From the M
4-8 CHAPTER 4: M ANAGING THE SWITCH 3000 TX STP Use this button to display screens for managing Spanning Tree Protocol (STP) information for the level of management you have chosen (port or VLAN). Refer to “Spanning Tree Protocol” on page 5-12. STP is not supported over Asynchronous Transfer Mode (ATM). Consequently, if you specify that you want to manage the Plug-in Module and the Switch has an ATM OC-3c Module installed, the STP button is not displayed.
Setting Up the Switch Unit 4-9 Setting Up the Switch Unit With the Switch Management screen displayed, choose the management level Unit, then select the SETUP button. The Unit Setup screen is displayed as shown in Figure 4-10. The screen shows the following fields: Unit Name This read-only field shows the type of device. sysName This field takes its name from the MIB II System Group object. You can edit the first 30 characters of this field to make the name more meaningful.
4-10 CHAPTER 4: M ANAGING THE SWITCH 3000 TX VLAN Configuration Mode Port / AutoSelect This field allows you to specify how ports on the Switch are placed in VLANs: ■ Port — The ports use Port VLAN Mode, which means that they are manually placed in the required VLAN. This is the default mode. ■ AutoSelect — The ports use AutoSelect VLAN Mode, which means that they are automatically placed in the required VLAN by referring to a VLAN Server database in 3Com’s Transcend® Enterprise Manager software.
Setting Up the Switch Ports 4-11 Setting Up the Switch Ports With the Switch Management screen displayed, choose the management level Port. Choose the appropriate port, then select the SETUP button. The Port Setup screen is displayed, as shown in Figure 4-11. If the port is an ATM OC-3c Module port, the ATM Port Setup screen is displayed. For more information, refer to the “SuperStack II Switch ATM OC-3c Module User Guide”.
4-12 CHAPTER 4: M ANAGING THE SWITCH 3000 TX IFM is not available on a port that has full duplex enabled: ■ ■ If the Duplex Mode field in this screen is set to Full Duplex, the Intelligent Flow Management field is not displayed Duplex Mode Half Duplex / Full Duplex / Unit Default This field allows you to specify the duplex mode of the port: ■ Full Duplex — Full duplex allows frames to be transmitted and received simultaneously and, in effect, doubles the potential throughput of a link.
Setting Up the Switch Ports ■ Unit Default — The port uses Port VLAN Mode or AutoSelect VLAN Mode depending on the contents of the VLAN Configuration Mode field in the Unit Setup screen. This is the default setting. For more information, refer to “Using AutoSelect VLAN Mode” on page 5-4. Broadcast Storm Control The Switch automatically creates an alarm on each of its ports in order to monitor the level of broadcast traffic on each port.
4-14 CHAPTER 4: M ANAGING THE SWITCH 3000 TX ■ Broadcast Storm Control calculates the average broadcast bandwidth over the previous 20-second interval. The average is based on four samples taken at 5-second intervals. ■ When the average value exceeds the rising threshold value, the rising action is triggered. The action is not triggered again until the average broadcast bandwidth falls below the falling threshold level.
Setting Up the Switch Database (SDB) 4-15 There are three types of entries in the SDB: Setting Up the Switch Database (SDB) ■ Ageing entries — Initially, all entries in the database are ageing entries. Entries in the database are removed (aged out) if, after a period of time (ageing time), the device has not transmitted. This prevents the database from becoming full with obsolete entries by ensuring that when a device is removed from the network, its entry is deleted from the database.
4-16 CHAPTER 4: M ANAGING THE SWITCH 3000 TX The Database View The Unit Database View screen, as shown in Figure 4-12, allows you to view and configure the Switch Database. To access the Unit Database view screen, display the Switch Management screen, choose the management level Unit, then select the SDB button. The Unit Database View screen shows the following: Database Entries This read-only field shows the number of entries currently in the SDB. The database holds a maximum of 4080 addresses.
Setting Up the Switch Database (SDB) DELETE This button allows you to delete entries from the database. You cannot delete an entry associated with a port that uses AutoSelect VLAN Mode. 4-17 Adding an Entry into the SDB 1 In the MAC Address field, enter the MAC address of the device. 2 In the Port Number field, enter the port identifier for this device. Searching the Switch Database You can search the switch database in two ways: by MAC address or port number.
4-18 CHAPTER 4: M ANAGING THE SWITCH 3000 TX Setting Up Resilient Links You can configure a Switch to provide resilient links to another device so that network disruption is minimized if a link fails. A resilient link pair consists of a main link and a standby link. You define a resilient link pair by specifying the main port and standby port at one end of the pair. When setting up resilient links, you should note the following: ■ Up to four resilient link pairs can be configured on a Switch 3000 TX.
Setting Up Resilient Links 4-19 Configuring Resilient Links With the Switch Management screen displayed, choose the port to be the main port in the resilient link pair, then select the RESILIENCE button. The Port Resilience screen is displayed, as shown in Figure 4-14. This screen allows you to set up, edit and delete resilient link pairs. The screen shows the following: Main Port ID This read-only field shows the ID of the main port.
4-20 CHAPTER 4: M ANAGING THE SWITCH 3000 TX ■ Both Failed — Although the resilient link is correctly configured, both links have failed. This could be due to loose connections or cable damage. ■ Unknown — The network configuration has changed and the resilient link pair no longer conforms to the rules. ■ Not Available — The resilient link pair is disabled.
Setting Up Resilient Links 4-21 Viewing the Resilient Links Setup With the Switch Management screen displayed, choose the management level Unit and select the RESILIENCE button. The Unit Resilience Summary screen is displayed, as shown in Figure 4-15. This screen shows the current resilient link configuration for the unit, and allows you to access the Port Resilience screen for resilient link pairs.
4-22 CHAPTER 4: M ANAGING THE SWITCH 3000 TX Pair Enable Enabled / Disabled This field displays whether this resilient link pair is currently enabled or disabled. You enable or disable a resilient link pair using the Port Resilience screen described in “Configuring Resilient Links” on page 4-19. OK This button allows you to access the Port Resilience screen for the current resilient link pair.
Setting Up Traps 4-23 Setting Up Traps Traps are messages sent across the network to an SNMP Network Manager. They alert the network administrator to faults or changes at the Switch device. Your Network Manager may automatically set up traps in the Switch Trap Table. Check the documentation accompanying the network management software. To access the Trap Setup screen, select the SETUP TRAPS button from the Management Setup Screen (described in Chapter 3). The Trap Setup screen is shown in Figure 4-16.
4-24 CHAPTER 4: M ANAGING THE SWITCH 3000 TX Setting up the Console Port From the Management Setup screen, described in Chapter 3, select the CONSOLE PORT button. The Console Port Setup screen is displayed, as shown in Figure 4-17. If you change any of the console port parameters, you terminate any existing sessions using the console port when you exit the screen. Ensure that the connected equipment’s console port parameters are set to match the new configuration.
Setting up the Console Port Speed 1200 / 2 400 / 4800 / 9 600 / 19200 This field allows you to select the correct line speed (baud rate) for your terminal or modem. If you have enabled auto-configuration, the line speed is set automatically. Char Size 8 This read-only field displays the character bit (data bit) size for the Switch. You should set your terminal to the same value. Parity NONE This read-only field displays the parity setting for the Switch.
4-26 CHAPTER 4: M ANAGING THE SWITCH 3000 TX Resetting the Switch 3000 TX If you suspect a problem with the Switch 3000 TX, you can reset it. 1 From the Main Menu, select the RESET option. The Reset screen is displayed, as shown in Figure 4-18. 2 Select OK. Resetting the Switch in this way is similar to performing a power-off/on cycle. No setup information is lost. CAUTION: Performing a reset may cause some of the data being transmitted at that moment to be lost.
Initializing the Switch 3000 TX 4-27 Initializing the Switch 3000 TX This screen allows you to perform a reset as described in the previous section, and in addition, returns non-volatile data stored on the unit to its factory defaults (shown on page 1-10). Note that the IP address is not cleared. You should only initialize the Switch if: ■ The configuration of the device no longer suits your network. ■ Other efforts to solve problems have not succeeded.
4-28 CHAPTER 4: M ANAGING THE SWITCH 3000 TX . Upgrading Software When 3Com issues a new version of the software image for the Switch, you can obtain it from 3Com’s information delivery systems, described in “Online Technical Services” on page F-1. For upgrading ATM OC-3c Module software, refer to the “SuperStack II Switch ATM OC-3c Module User Guide”. You use the Software Upgrade screen to download new software images. The protocol used for downloading software images is TFTP running over UDP/IP or IPX.
5 ADVANCED MANAGEMENT Virtual LANs (VLANs) Setting up Virtual Local Area Networks (VLANs) on the Switch 3000 TX provides you with less time-consuming network administration and more efficient network operation. The following sections explain more about the concept of VLANs and explain how they can be implemented on the Switch 3000 TX.
5-2 CHAPTER 5: ADVANCED MANAGEMENT How VLANs Ease Change and Movement With traditional IP networks, network administrators spend much of their time dealing with moves and changes. If users move to a different IP subnet, the IP addresses of each endstation must be updated manually. With a VLAN setup, if an endstation in VLAN 1 is moved to a port in another part of the network, you only need to specify that the new port is in VLAN 1.
Virtual LANs (VLANs) VLANs and the Switch 3000 TX The Switch 3000 TX supports VLANs which consist of a set of switch ports. Each switch port can only belong to one VLAN at a time, regardless of the device to which it is attached. Each Switch 3000 TX can support up to 16 VLANs. However, you can have more than 16 VLANs in your entire network; to do this, you connect the 16 Switch VLANs to other VLANs using a router.
5-4 CHAPTER 5: ADVANCED MANAGEMENT Using AutoSelect VLAN Mode By default, all ports on the Switch use Port VLAN Mode — where each switch port is manually placed in the required VLAN. The Switch allows some ports to use another mode, AutoSelect VLAN Mode. In this mode, the ports are automatically placed in the required VLAN by referring to a VLAN Server database in 3Com’s Transcend Enterprise Manager v6.0 for Windows.
Virtual LANs (VLANs) If you use AutoSelect VLAN Mode, note the following: ■ You need to specify an IP address and community string for the VLAN Server. ■ You cannot use VLAN 15. ■ If a port has been configured as a backbone port or as a VLT port, the port cannot use AutoSelect VLAN Mode. ■ If a port has a permanent address stored against it in the Switch Database, the port cannot use AutoSelect VLAN Mode. ■ We recommend that you connect each switch port to a single endstation.
5-6 CHAPTER 5: ADVANCED MANAGEMENT VLAN Configuration Example The example shown in Figure 5-5 illustrates two VLANs spanning three Switch 1000 units and a basement Switch 3000 TX unit. Each Switch 1000 connects to the basement Switch using a VLT. The attached router allows the two VLANs to communicate with each other. To set up this configuration: 1 Use the VT100 screens or VLAN Server database to: a Place ports 1–6 and 13–18 of all the Switch 1000 units in VLAN 1.
Virtual LANs (VLANs) Figure 5-5 VLAN configuration with a Switch 3000 TX as a basement switch 5-7
5-8 CHAPTER 5: ADVANCED MANAGEMENT Setting Up VLANs on the Switch The VLAN Setup screen allows you to: ■ Assign ports to VLANs, if those ports use Port VLAN Mode. ■ View VLAN setup information for the Switch. To access the VLAN Setup screen: 1 From the Main Menu, select SWITCH MANAGE- MENT. The Switch Management screen is displayed. 2 In the Management Level field, choose VLAN. 3 Choose the SETUP button. The VLAN Setup screen is displayed as shown in Figure 5-6.
Virtual LANs (VLANs) Port ID 1 / 2 / 3 ... 6 / 7 / 8 This field displays the ID of the port currently selected in the listbox. VLAN ID 1 / 2 / 3 ...14 / 15 / 16 If the port specified in the Port ID field uses Port VLAN Mode, this field allows you to enter the ID of the VLAN to which the port is to be assigned. If the port uses AutoSelect VLAN Mode, you cannot specify the VLAN ID. By default, all ports use Port VLAN Mode and belong to the Default VLAN (VLAN 1).
5-10 CHAPTER 5: ADVANCED MANAGEMENT Setting Up VLANs Using AutoSelect VLAN Mode To set up VLANs using AutoSelect VLAN Mode, you need to: ■ Specify information about the VLAN Server ■ Specify that the Switch unit, or individual ports on the unit, use AutoSelect VLAN Mode Specifying Information About the VLAN Server The VLAN Server screen allows you to specify information about the VLAN Server.
Virtual LANs (VLANs) Specifying AutoSelect VLAN Mode To specify that the Switch uses AutoSelect VLAN Mode, refer to “Setting Up the Switch Unit” on page 4-9. To specify that a port on the Switch uses AutoSelect VLAN Mode, refer to “Setting Up the Switch Ports” on page 4-11.
5-12 CHAPTER 5: ADVANCED MANAGEMENT Spanning Tree Protocol Using the Spanning Tree Protocol (STP) functionality of your Switch makes your network more fault tolerant. The following sections explain more about STP and the STP features supported by the Switch. STP is not currently supported over an Asynchronous Transfer Mode (ATM) network. Therefore, if you have an ATM OC-3c Module installed in your Switch, it does not join the STP system. What is STP? STP is a part of the 802.
Spanning Tree Protocol Figure 5-8 A network that creates loops Figure 5-9 Traffic flowing through Bridges C and A Figure 5-10 Traffic flowing through Bridge B 5-13
5-14 CHAPTER 5: ADVANCED MANAGEMENT How STP Works STP Initialization Initially, the STP system requires the following before it can configure the network: ■ ■ Communication between all the bridges. This communication is carried out using Bridge Protocol Data Units (BPDUs), which are transmitted in packets with a known multicast address. One bridge to start as a master or Root Bridge, a central point from which the network is configured.
Spanning Tree Protocol An Example Figure 5-11 illustrates part of a network. All bridges have a path cost value assigned to each port, identified by PC=xxx (where xxx is the value). Bridge A is selected by STP as the Root Bridge, because it has the lowest Bridge Identifier. The Designated Bridge Port for LAN A is port 1 on Bridge A. Each of the other four bridges have a Root Port (the port closest to the Root Bridge). Bridge X and Bridge B can offer the same path cost to LAN B.
5-16 CHAPTER 5: ADVANCED MANAGEMENT STP Configurations Figure 5-12 shows two possible STP configurations using SuperStack II Switch units: ■ Configuration 1 — Redundancy for Backbone Link In this configuration, a Desktop Switch and Switch 3000 TX both have STP enabled and are connected by two Fast Ethernet links. STP discovers a duplicate path and disables one of the links. If the enabled link breaks, the disabled link becomes re-enabled, therefore maintaining connectivity.
Spanning Tree Protocol Enabling STP on the Switch To enable STP on your Switch: 1 From the VT100 Main Menu, select SWITCH MANAGEMENT. The Switch Management screen is displayed. 2 In the Management Level field, choose Unit. 3 Choose the SETUP button. The Unit Setup screen is displayed as shown in Figure 5-13. 4 In the Spanning Tree field, specify Enable. 5 Choose OK. You cannot enable STP if you have set up resilient links on any of the Switch ports, or if you are using VLAN 16.
5-18 CHAPTER 5: ADVANCED MANAGEMENT Configuring STP on the Switch CAUTION: You should not configure any STP parameters unless you have considerable knowledge and experience with STP. Configuring the STP Parameters of VLANs The Switch has a completely separate STP system for each VLAN that you have specified. Each VLAN has its own Root Bridge, Root Ports, and BPDUs. The VLAN STP screen allows you to set up and manage an STP system for each VLAN on the Switch.
Spanning Tree Protocol 5-19 Forward Delay 4 ... 30 This read-only field shows the time (in seconds) that the ports on the Switch spend in the listening and learning states. For more information about these states, refer to “Configuring the STP Parameters of Ports” on page 5-20. Bridge Hello Time 1 ... 10 This field allows you to specify the time delay (in seconds) between the transmission of BPDUs from the Switch when it is the Root Bridge. The default setting for this field is 2 seconds.
5-20 CHAPTER 5: ADVANCED MANAGEMENT Configuring the STP Parameters of Ports The Port STP screen allows you to set up and manage the STP parameters of each port on the Switch. To access the Port STP screen: 1 From the Main Menu, select SWITCH MANAGE- MENT. The Switch Management screen is displayed. 2 In the Management Level field, choose Port. 3 In the Port ID field, enter the ID of the port to be configured. 4 Choose the STP button. The Port STP screen is dis- played as shown in Figure 5-15.
Spanning Tree Protocol 5-21 Designated Cost This read-only field shows the path cost from the Root Bridge to the Designated Bridge Port for the current port’s segment. Fast Start Enable/Disable This field allows you to specify whether the port goes directly to the Forwarding state when a device is connected to it. Set this field to Enable if the port is directly connected to an endstation. The default setting for this field is Disable.
5-22 CHAPTER 5: ADVANCED MANAGEMENT manage the probe by in-band or out-of-band connections. RMON Using the RMON (Remote Monitoring) capabilities of your Switch allows network administrators to improve their efficiency and reduce the load on their network. The following sections explain more about the RMON concept and the RMON features supported by the Switch.
RMON Both rising and falling thresholds are supported, and thresholds can be on the absolute value of a variable or its delta value. In addition, alarm thresholds may be autocalibrated or set manually. Alarms are used to inform you of a network performance problem and they can trigger automated action responses through the Events group. Hosts The Hosts group specifies a table of traffic and error statistics for each host on a LAN segment or VLAN.
5-24 CHAPTER 5: ADVANCED MANAGEMENT important occurrences, you can depend on the Event group for notification. Through the SNMP traps, events can trigger other actions providing a mechanism for an automated response to certain occurrences. Benefits of RMON Using the RMON features of your Switch has three main advantages: ■ RMON improves your efficiency Using RMON probes allows you to remain at one workstation and collect information from widely dispersed LAN segments or VLANs.
RMON RMON Features of the Switch Table 5-2 details the RMON support provided by the Switch. Table 5-2 RMON support supplied by the Switch RMON Group Support supplied by the Switch Hosts Although Hosts is supported by the Switch, there are no Hosts sessions defined on a new or initialized Switch by default. RMON support supplied by the Switch RMON Group Support supplied by the Switch Statistics A new or initialized Switch has one Statistics session per port/VLAN.
5-26 CHAPTER 5: ADVANCED MANAGEMENT When using the RMON features of the Switch, you should note the following: ■ ■ ■ After the default sessions are created, they have no special status. You can delete or change them as required. The Switch 3000 TX can forward a very large volume of packets per second. The Statistics RMON group is able to monitor every packet, but the other groups sample a maximum of 6000 packets a second.
RMON About Default Alarm Settings About the Audit Log A new or initialized Switch has four alarms defined for each port: ■ Bandwidth used ■ Broadcast bandwidth used ■ Percentage of packets forwarded ■ Errors per 10,000 packets Statistic The Switch keeps an audit log of all management user sessions, providing a record of changes to any MIB including the RMON MIB. The log can only be read by users at the security access level using an SNMP Network Manager.
5-28 CHAPTER 5: ADVANCED MANAGEMENT
6 STATUS MONITORING This chapter describes how to view the current operating status of the Switch, how to display any error information in a fault log and how to carry out a remote poll to check the response of another network device. It also describes the Statistics screens for the Switch, and advises you on actions to take if you see unexpected values for the statistics. Please note however, that as all networks are different, any actions listed are only suggestions.
6-2 CHAPTER 6: STATUS M ONITORING AND STATISTICS Summary Statistics With the Switch Management screen displayed, choose the management level Unit, then select the STATISTICS button. The Summary Statistics screen is displayed, as shown in Figure 6-1. The Summary Statistics screen lists values for the current counter against every port on the Switch and it is refreshed approximately every 2 seconds. Once values have reached approximately 4,000,000,000 they are reset to zero.
Port Statistics 6-3 Port Statistics With the Switch Management screen displayed, choose the management level port, then select the STATISTICS button. The Port Statistics screen is displayed as shown in Figure 6-2. As well as showing statistics for the port, the Port Statistics screen allows you access to traffic and error counter screens. If the port is an ATM OC-3c Module port, the ATM Port Statistics screen is displayed.
6-4 CHAPTER 6: STATUS M ONITORING AND STATISTICS Port Traffic Statistics With the Port Statistics screen displayed, select the TRAFFIC STATISTICS button. The Port Traffic Statistics screen is displayed, as shown in Figure 6-3. The Port Traffic Statistics screen shows the following: Port ID The ID of the port you are currently managing. Frames Received The number of valid frames received by the port, including fragments and frames with errors.
Port Traffic Statistics Fragments The total number of packets received that were not an integral number of octets in length or that had a bad Frame Check Sequence (FCS), and were less than 64 octets in length (excluding framing bits, but including FCS octets). Frames Forwarded The total number of frames which were received by the port and forwarded to their destination address.
6-6 CHAPTER 6: STATUS M ONITORING AND STATISTICS Port Error Analysis With the Port Statistics screen displayed, select the ERROR ANALYSIS button. The Port Error Analysis screen is displayed as shown in Figure 6-4. The Port Error Analysis screen shows the following: Port ID The ID of the port you are currently managing. CRC Align Errors This counter is incremented by one for each frame with a CRC (Cyclical Redundancy Check) error or an alignment error.
Port Error Analysis Jabbers The total number of packets received that were longer than 8K octets (excluding framing bits, but including FCS octets). CLEAR SCREEN COUNTERS Select this button to set all counters shown on the screen to zero. It is useful for trend analysis if you wish to see changes in counters over a short period of time. This button does not clear the counters on the device or affect counters at the network management workstation.
6-8 CHAPTER 6: STATUS M ONITORING AND STATISTICS Status Monitoring The status screen provides read-only information about the Switch. This information may be useful for your technical support representative in the event of a problem. To access the screen, from the Main Menu, select the STATUS option. The Status screen is displayed as shown in Figure 6-5. The Status screen shows the following: System Up Time The time the unit has been running since the last reset or power-off/on cycle.
Fault Log Fault Log The Fault Log displays read-only information about the Switch which is updated whenever an abnormal condition is detected. This information is for internal 3Com use only. You may be asked to quote this information if reporting a fault to your supplier. With the Status screen displayed, select the FAULT LOG button. The Fault Log is screen is displayed as shown in Figure 6-6. The Fault Log screen shows the following: Reset Count The number of resets recorded at the time of the fault.
6-10 CHAPTER 6: STATUS M ONITORING AND STATISTICS Remote Polling The Remote Poll screen allows you to send a single frame to a remote device to see if that device is responding. This can help to locate the source of a network problem. It is also particularly helpful in locating devices that support IP, IPX and ping but are not manageable by SNMP. To poll a device: 1 From the Main Menu, select Remote Poll. The Remote Poll screen is displayed, as shown in Figure 6-7.
A SAFETY INFORMATION Before carrying out any installation or removal of components, or any maintenance procedures on the Switch, you must read the following safety information. ■ The appliance coupler, that is, the connector to the device itself and not the wall plug, must have a configuration for mating with an EN60320/IEC320 appliance inlet. ■ For U.S.A. and Canada: Important Safety Information ■ WARNING: Warnings contain directions that you must follow for your personal safety.
A-2 APPENDIX A: SAFETY INFORMATION ■ It is essential that the mains socket outlet is installed near to the unit and is accessible. You can only disconnect the unit by removing the appliance coupler from the unit. ■ If the power supply plug is unsuitable and you have to replace it, you may find other codings for the respective connections.
Important Safety Information Power Supply and Fuse The unit automatically adjusts to the supply voltage. The fuse is suitable for both 110V A.C. and 220–240V A.C. operation. WARNING: Ensure that the power is disconnected before opening the fuse holder cover. A-3 Sockets for Redundant Power System (RPS) Only connect a 3Com Redundant Power System to this socket. For details, follow the installation instructions in the manuals accompanying the Redundant Power System.
A-4 APPENDIX A: SAFETY INFORMATION ■ L’information de Sécurité Importante Pour USA et le Canada: ■ AVERTISSEMENT: Les avertissements contiennent les directions que vous devez suivre pour votre sécurité personnelle. Suivez toutes les directives avec soin. ■ ■ L'installation et l'enlèvement de l'unité doivent être faits seulement par le personnel qualifié. ■ Si vous entassez l'unité Switch avec les unités SuperStack II Hub, l'unité Switch doit être installée en dessous des unités Hub plus étroites.
L’information de Sécurité Importante ■ ■ Assurer que l'entrée de la source d'alimentation soit débranchée avant d'ouvrir le couvercle de fusible du connecteur IEC ou d'enlever le couvercle de l'unité. Seulement Pour La France et Le Pérou: ■ ■ Cette unité ne peut pas être mise en marche des sources de courant IT (Impédance à la terre).
A-6 APPENDIX A: SAFETY INFORMATION Socle Pour Alimentation Multiple Brancher seulement une alimentation multiple de 3Com à cet socle. Suivre pour les détails les directives de l'installation dans le manuel qui accompagne l'alimentation multiple. Les Ports RJ45 AVERTISSEMENT: Ceux-ci sont les prises de courant de données RJ45 protégées. Ils ne peuvent pas être utilisés comme prises de courant téléphoniques. Brancher seulement les connecteurs RJ45 de données à ces prises de courant.
Wichtige Sicherheitsinformationen ■ Es ist wichtig, daß der Netzstecker sich in unmittelbarer Nähe zum Gerät befindet und leicht erreichbar ist. Das Gerät kann nur durch Herausziehen des Verbindungssteckers aus der Steckdose vom Stromnetz getrennt werden. ■ Das Gerät wird mit Sicherheits-Kleinspannung nach IEC 950 (SELV = Safety Extra Low Voltage) betrieben. Angeschloßen werden können nur Geräte, die ebenfalls nach SELV betrieben werden. ■ Das Gerät ist unter keinen Umständen an einen Wechselstrom (A.
A-8 APPENDIX A: SAFETY INFORMATION Stromversorgung und Sicherung Das Gerät stellt sich automatisch auf die Versorgungsspannung ein. Die Sicherung ist sowohl für 110V A.C. wie für 220–240V A.C. geeignet. WARNUNG: Vor dem Öffnen der Sicherungshalterung das Gerät vom Netzstrom trennen. Steckdose für Redundant Power System Nur ein 3Com Redundant Power System an diese Steckdose anschließen. Für weitere Angaben die genauen Einbauanweisungen im Handbuch zum Redundant Power System befolgen.
B SCREEN ACCESS RIGHTS The following table lists the rights assigned to each level of user for accessing and editing Switch screens via the VT100 interface. All access rights are read-and-write unless otherwise stated. Screen Port Traffic Statistics Available to... Monitor Manager Security Port Error Analysis Monitor Manager Security Screen Available to...
B-2 APPENDIX B: SCREEN ACCESS RIGHTS Screen Available to...
C TROUBLE-SHOOTING The following is a list of problems you may see when managing the Switch with suggested courses of corrective action to take. If you have a problem which is not listed here and you cannot solve it, contact your local technical support representative. LEDs The Plug-in Module Status LED lights yellow: If the MGMT LED is flashing yellow, the Module has failed its Power On Self Test; refer to the previous advice. Otherwise, the Module’s agent software is not installed correctly.
C-2 APPENDIX C: TROUBLE-SHOOTING Using the VT100 Interface The initial Main Banner screen does not display: Check that your terminal or terminal emulator is correctly configured to operate as a VT100 terminal. For console port access, you may need to press [Return] several times before the Main Banner appears. Check the settings on your terminal or terminal emulator. The management facility's auto configuration works only with baud rates from 1200 to 19,200.
Using the Switch Check that the port through which you are trying to access the device is in VLAN 1 (the Default VLAN). Refer to “Setting Up VLANs on the Switch” on page 5-8. Try accessing the device through a different port. If you can now access the device, a problem with the original port is indicated. Re-examine the connections and cabling. There may be a network problem preventing you accessing the device over the network. Try accessing the device through the console port.
C-4 APPENDIX C: TROUBLE-SHOOTING You have added the Switch 3000 TX to an already busy network, and response times and traffic levels have increased: You may have added a group of users to one of the Switch 3000 TX ports via a repeater or switch, and not turned off Intelligent Flow Management (IFM). Turn off IFM on any port that is connected to multiple devices. Refer to “Setting Up the Switch Ports” on page 4-11.
Using the Switch C-5 You are trying to manage the Switch over a network which has STP, and you are losing contact with the management agent intermittently. As shown in Figure C-1, there is a SuperStack® II Switch unit (Switch A) between your management workstation and the Switch 3000 TX (Switch B). You have configured more than one VLAN on both Switch units, and there is a parallel STP path for each VLAN between the Switch units.
C-6 APPENDIX C: TROUBLE-SHOOTING
D PIN-OUTS Null Modem Cable 9-pin to RS-232 25-pin PC-AT Serial Cable 9-pin to 9-pin
D-2 APPENDIX D: PIN-OUTS Modem Cable 9-pin to RS-232 25-pin RJ45 Pin Assignments
E SWITCH 3000 TX TECHNICAL SPECIFICATIONS Physical Dimensions Height: 76mm (3.0in) x Width: 483mm (19.0in) x Depth: 300mm (12.0in) Weight: 4.4kg (9.7lbs) Environmental Requirements Operating Temperature 0–50°C (32–122°F) Storage Temperature -10–70 °C (14–158°F) Operating Humidity 10–95% relative humidity, non-condensing Standards EN60068 (IEC68) Safety Agency Certifications UL 1950, EN60950, CSA 22.2 No.
E-2 APPENDIX E: SWITCH 3000 TX TECHNICAL SPECIFICATIONS Standards Supported SNMP Protocols Used for Administration SNMP protocol (RFC 1157) UDP (RFC 768) MIB-II (RFC 1213) IP (RFC 791) Bridge MIB (RFC 1493) ICMP (RFC 792) Repeater MIB (RFC 1516) TCP (RFC 793) VLAN MIB (RFC 1573) ARP (RFC 826) RMON MIB (RFC 1271 and RFC 1757) TFTP (RFC 783) Terminal Emulation BOOTP (RFC 951) Telnet (RFC 854)
F 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 very latest, we recommend that you access 3Com Corporation’s World Wide Web site.
F-2 APPENDIX F: TECHNICAL SUPPORT Country Data Rate Telephone Number Taiwan up to 14400 bps 886 2 377 5840 Country Telephone Number Country Telephone Number U.K. up to 28800 bps 44 1442 438278 Australia 1 800 123853 Netherlands 06 0228049 U.S.A.
Support from Your Network Supplier Support from Your Network Supplier If additional assistance is required, 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.
F-4 APPENDIX F: TECHNICAL SUPPORT Regional Sales Office Telephone Number Location Telephone Number Fax Number 3Com Latin America Argentina Brazil Chile Colombia Mexico Peru Venezuela U.S.A.
GLOSSARY 10BASE-T bandwidth The IEEE 802.3 specification for Ethernet over Unshielded Twisted Pair (UTP) cabling. 100BASE-FX 100Mbps Ethernet implementation over fiber. 100BASE-TX 100Mbps Ethernet implementation over category 5 and Type 1 Twisted Pair cabling. ageing The automatic removal of dynamic entries from the Switch Database which have timed-out and are no longer valid. Information capacity, measured in bits per second, that a channel can transmit.
2 G LOSSARY broadcast storm Fast Ethernet Multiple simultaneous broadcasts that typically absorb available network bandwidth and can cause network failure. 100Mbps technology based on the Ethernet/CD network access method. forwarding console port The port on the Switch accepting a terminal or modem connector. It changes the parallel arrangement of data within computers to the serial form used on data transmission links. This port is most often used for dedicated local management.
GLOSSARY LAN 3 multicast Local Area Network. A network of connected computing resources (such as PCs, printers, servers) covering a relatively small geographic area (usually not larger than a floor or building). Characterized by high data rates and low error rates. Single packets copied to a specific subset of network addresses. These addresses are specified in the destination-address field of the packet. PACE Priority Access Control Enabled.
4 G LOSSARY RMON Spanning Tree Protocol (STP) Remote Monitoring. Subset of SNMP MIB II allows monitoring and management capabilities by addressing up to ten different groups of information. A bridge-based system for providing fault tolerance on networks. STP works by allowing you to implement parallel paths for network traffic, and ensure that redundant paths are disabled when the main paths are operational and enabled if the main paths fail. RPS Redundant Power System.
GLOSSARY TFTP Trivial File Transfer Protocol. Allows you to transfer files (such as software upgrades) from a remote device using your Switch unit’s local management capabilities. Transcend® 3Com’s umbrella management system used to manage all of 3Com’s networking solutions. UDP User Datagram protocol. An Internet standard protocol that allows an application program on one device to send a datagram to an application program on another device. VLAN Virtual LAN.
6 G LOSSARY
INDEX Numerics 100BASE-TX port 1-2, 1-8 3Com Bulletin Board Service (3ComBBS) F-1 3Com sales offices F-3 3Com URL F-1 3ComFacts F-2 3ComForum F-2 A Access Level field 4-3 access rights B-1 Active Port field 4-20, 4-21 ageing entries 4-15 ageing time, specifying 4-10 agent software version number 6-8 alarm actions 5-26 alarm settings, default 5-27 Alarms (RMON group) 5-22, 5-25 Asynchronous Transfer Mode.
2 INDEX D Data Link Protocol field 3-10 Database Entries field 4-16 database.
INDEX Server Address 4-28 SLIP Address 3-10 SLIP SubNet Mask 3-10 Spanning Tree 4-10 Speed 4-25 Standby Links Available 4-19 STANDBY Port 4-21 Standby Port ID 4-19 Stop Bit 4-25 STP State 5-20 sysName 4-9 System Up Time 6-8 Target Address 6-10 Throttle 4-23, 5-10 Time Since Topology Change 5-19 Topology Changes 5-18 Type 5-8 Unit Name 4-9 Upgradable Software Version Number 6-8 User Name 3-7, 4-3, 4-5 VLAN Configuration Mode 4-10, 4-12 VLAN ID 5-9, 5-18 VLAN Membership 5-8 VLAN Server Community String 5-10
4 INDEX default 3-7 forgetting 4-5 new 4-3 Path Cost field 5-21 path costs, default 5-14 permanent entries 4-15 displaying 4-16 specifying 4-16, 4-17 Permanent field 4-16 pin assignments modem cable D-2 null modem cable D-1 RJ45 D-2 serial cable D-1 Plug-in Module 1-2 slot 1-9 Plug-in Module Type field 4-10 Poll Period field 5-10 port 100BASE-TX 1-2, 1-8 console 1-9 enabling and disabling 4-11 priority 5-21 speed 4-11 state 4-11 statistics 6-3 Port Enable field 5-21 Port Error Analysis screen 6-6 Port Num
INDEX SLIP Address field 3-10 SLIP SubNet Mask field 3-10 SNMP 1-10, 3-6 Community 4-6 quick start 1-11 socket power 1-9 RPS 1-9 Software Upgrade screen 4-28 software version number 6-8 Spanning Tree field 4-10 Spanning Tree Protocol. See STP specifications, technical E-1 Speed field 4-25 standards supported E-2 Standby Links Available field 4-19 STANDBY Port field 4-21 Standby Port ID field 4-19 statistics 6-1 counters.
6 INDEX V Z version number boot software 6-8 hardware 6-8 upgradable software 6-8 Virtual LAN Trunks. See VLTs Virtual LANs.
3Com Corporation LIMITED WARRANTY within the warranty period. Products returned to 3Com’s Corporate Service Center must be pre-authorized by 3Com with a Return Material Authorization (RMA) number marked on the outside of the package, and sent prepaid, insured, and packaged appropriately for safe shipment. The repaired or replaced item will be shipped to Customer, at 3Com’s expense, not later than thirty (30) days after receipt of the defective product by 3Com.
ELECTRO-MAGNETIC COMPATIBILITY STATEMENTS 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.
