Page 1 SuperStack II Switch ® Management Guide ® For units in the SuperStack II Switch 1100/3300 and 610/630 Family Management Software Version 2.50 http://www.3com.com/ Part No. DUA1695-0BAA04 Published May 2000...
Page 2 All other company and product names may be trademarks of the respective companies with which they are associated. ENVIRONMENTAL STATEMENTS It is the policy of 3Com Corporation to be environmentally- friendly in all operations. To uphold our policy, we are committed to: •...
Page 3: Table Of Contents
ONTENTS BOUT UIDE Conventions Related Documentation Year 2000 Compliance Documentation Comments Product Registration I Getting Started with Management II S UPER TACK WITCH ANAGEMENT OFTWARE What is Management Software? Summary of Software Features Software Features Explained Stack Management Forwarding Modes Duplex Modes Flow Control Traffic Prioritization...
Page 4 ETTING P FOR ANAGEMENT Methods of Managing a Switch Setting Up Web Interface Management Setting Up Through the Console Port Setting Up Over the Network Installing Online Help and Documentation Choosing a Browser Configuring the Browser Setting Up Command Line Interface Management Setting Up Through the Console Port Setting Up Over the Network Setting Up SNMP Management...
Page 5 Setting Up IP Information Configuring a Port Configuring the Console Port Changing the Management Settings for the Stack Specifying a Descriptive Name Changing Your Password Specifying a Physical Location Accessing the Getting Started Pages Specifying the Location of the Online Help and Documentation Specifying Contact Details Configuring the Stack Configuring the Switch Database...
Page 6 Defining Monitor Ports and Analysis Ports Enabling the Roving Analysis System Resetting All the Units in the Stack What Happens During a Reset? Initializing All the Units in the Stack What Happens During an Initialization? Upgrading Management Software Displaying Statistics for the Current Switch Displaying Unit Statistics Interpreting the Statistics Displaying Port Statistics...
Page 7 Displaying Port Summary Information Enabling and Disabling VLT Tagging on a Port Setting the Bridge Spanning Tree Forward Delay Setting the Bridge Spanning Tree Hello Timer Setting the Bridge Spanning Tree Maximum Age Setting the Spanning Tree Bridge Priority Enabling and Disabling Spanning Tree on a Bridge Adding a Port to a VLAN Creating a VLAN Deleting a VLAN...
Page 8 Specifying IP and SLIP Information Displaying IP and SLIP Information Enabling and Disabling BOOTP Pinging Other Devices Resetting the IP Configuration Displaying and Changing SNMP-related Information Specifying SNMP Community Strings Specifying Trap Destination Details Displaying Trap Destination Details Modifying Trap Destination Details Removing Trap Destination Details Performing an SNMP GET Command Performing an SNMP GETNEXT Command...
Page 9 III Management Reference RUNKS What are Port Trunks? Port Trunks and Your Switch Placing Ports in a Port Trunk Port Trunk Example (VLAN IRTUAL What are VLANs? Benefits of VLANs VLANs and Your Switch The Default VLAN Defining New VLANs Untagged and Tagged VLANs Placing a Port in a Single VLAN Placing a Port in Multiple VLANs...
Page 10 ULTICAST ILTERING What is a Multicast? What is Multicast Filtering? Multicast Filtering and Your Switch IEEE 802.1p Multicast Filtering Enabling 802.1p Multicast Learning IGMP Multicast Filtering Enabling IGMP Multicast Learning Manual Filtering PANNING ROTOCOL What is STP? How STP Works STP Requirements STP Calculation STP Configuration...
Page 11 IV Problem Solving ROBLEM OLVING Solving Web Interface Problems Solving Command Line Interface Problems Solving SNMP Management Software Problems Solving Serial Web Utility Problems Solving Management Software Upgrade Utility Problems Solving Other Problems V Appendices and Index ERIAL TILITY Introduction Installing the Serial Web Utility Using the Serial Web Utility ANAGEMENT...
Page 13: About This Guide
BOUT UIDE This guide provides all the information you need to manage units in the ® SuperStack II Switch 1100/3300 and 610/630 family with management software version 2.50. The guide is intended for use by network administrators who are responsible for installing and setting up network equipment; consequently, it assumes a basic working knowledge of LANs (Local Area Networks).
Page 14 BOUT UIDE Table 2 Text Conventions Convention Description Screen displays This typeface represents information as it appears on the screen. The word “syntax” means that you must evaluate the syntax Syntax provided and then supply the appropriate values for the placeholders that appear in angle brackets.
Page 15: Related Documentation
SuperStack II Switch Help This help provides information about the web interface software of the Switch. It is supplied on the SuperStack II Switch Family CD-ROM. SuperStack II Switch README File This file provides information about the current software release, including new features, modifications, and known problems.
Page 16: Documentation Comments
Document part number (on the title page) Page number (if appropriate) Example: SuperStack II Switch Management Guide Part Number DUA1695-0BAA04 Page 21 Product You can now register your SuperStack II Switch on the 3Com web site to Registration receive up-to-date information on your product: http://www.3com.com/productreg/pdd...
Page 17: I Getting Started With Management
ETTING TARTED WITH ANAGEMENT Chapter 1 SuperStack II Switch Management Software Chapter 2 Setting Up for Management...
Page 19: Super Stack Ii Switch Management Software
II S UPER TACK WITCH ANAGEMENT OFTWARE This chapter contains introductory information about the SuperStack ® Switch management software and how it can be used in your network. It covers the following topics: What is Management Software? Summary of Software Features Software Features Explained Default Settings...
Page 20: What Is Management Software
1: S II S HAPTER UPER TACK WITCH ANAGEMENT OFTWARE What is Your Switch contains software that allows you to change and monitor the Management way it works. This management software is not required to get the Software? Switch working, but if you do use it, you may improve the efficiency of the Switch and therefore improve the overall performance of your network.
Page 21: Software Features Explained
Software Features Explained Table 3 Software features Feature Switch 1100/610 Family Switch 3300 /630 Family Spanning Tree Supported Supported Protocol RMON Seven groups supported: Seven groups supported: Statistics, History, Alarms, Statistics, History, Alarms, Hosts, Hosts Top N, Matrix, Hosts, Hosts Top N, Matrix, Events Events Roving Analysis...
Page 22: Duplex Modes
1: S II S HAPTER UPER TACK WITCH ANAGEMENT OFTWARE Units in the Switch 1100/610 family support three forwarding modes in addition to Store and Forward: Fast Forward — Packets are forwarded as soon as the destination address is received and processed. With Fast Forward, packets take less time to be forwarded, but all error packets are propagated onto the network because no time is allowed for checking.
Page 23: Flow Control
Flow control is implemented in two ways: IEEE 802.3x standard for ports operating in full duplex. Intelligent Flow Management (IFM), a 3Com proprietary method of flow control, for ports operating in half duplex. IFM should only be enabled if the port is connected to another switch, or an endstation. If the port is connected to a repeated segment with local traffic, IFM should be disabled.
Page 24: Pace
163. PACE Your Switch supports PACE (Priority Access Control Enabled) which is a 3Com proprietary feature that allows multimedia traffic to move across a network effectively. PACE provides two main features: Implicit Class of Service — This feature gives priority to traffic from multimedia applications, and provides the same functionality as IEEE 802.1p traffic prioritization (see...
Page 25: Resilient Links
Software Features Explained No other address can be learned until security is disabled or the address is manually removed from the database. The address cannot be learned on another port until security is disabled or the address is manually removed from the database. For more information about enabling security on a port, see “Configuring a Port”...
Page 26: Broadcast Storm Control
1: S II S HAPTER UPER TACK WITCH ANAGEMENT OFTWARE Broadcast Storm Your Switch supports Broadcast Storm Control, a system that automatically creates an alarm for each port to monitor the level of Control broadcast traffic on that port. If the broadcast traffic level rises to 2976 frames per second, the broadcast traffic on the port is blocked until the broadcast traffic level drops to 1488 frames per second.
Page 27: Multicast Filtering
Software Features Explained Multicast Filtering Your Switch supports two multicast filtering systems: IEEE 802.1p, which uses the GARP Multicast Registration Protocol (GMRP) IGMP (Internet Group Management Protocol) These systems allow the Switch to forward multicast traffic to the endstations that are interested rather than broadcasting the traffic to the whole network.
Page 28: Roving Analysis
A terminal or terminal emulator connected to the console port of the Switch SNMP management — You can manage the Switch using any network management application running the Simple Network Management Protocol (SNMP), such 3Com Transcend ® Enterprise Manager software.
Page 29: Default Settings
Default Settings Default Settings Table 4 shows the default settings of units in the Switch 1100/3300 and 610/630 family. If you initialize one of these Switch units, it is returned to these defaults. Table 4 Default Settings Switch 1100/610 Family Switch 3300/630 Family Port Status Enabled...
Page 30 1: S II S HAPTER UPER TACK WITCH ANAGEMENT OFTWARE Table 4 Default Settings Switch 1100/610 Family Switch 3300/630 Family RMON Alarm Enabled: Enabled: (errors over High threshold: 20 errors per High threshold: 20 errors per 1 min) second — Notify second —...
Page 31: Setting U P For Management
ETTING P FOR ANAGEMENT This chapter explains the various ways of managing a Switch, and details the steps required before you can configure a Switch to suit the needs of your network. It covers the following topics: Methods of Managing a Switch Setting Up Web Interface Management Setting Up Command Line Interface Management Setting Up SNMP Management...
Page 32: Methods Of Managing A Switch
Manager running the Simple Network Management Protocol (SNMP), ® such as 3Com Transcend Enterprise Manager software. For maximum manageability, we recommend that you use 3Com Transcend Enterprise Manager software. Figure 1 shows each of these management methods. Figure 1 Management methods...
Page 33: Setting Up Web Interface Management
Setting Up Web Interface Management Setting Up Web You can access the web interface using: Interface A management workstation connected to the console port of a Management Switch, running the Serial Line Internet Protocol (SLIP). A management workstation connected to a Switch over an IP network.
Page 34: Setting Up Over The Network
2: S HAPTER ETTING P FOR ANAGEMENT Setting Up Over the To manage a Switch using the web interface over an IP network: Network 1 You must set up the Switch with IP information. To do this: a Access the web interface of the Switch through the console port. See “Setting Up Through the Console Port”...
Page 35: Choosing A Browser
Setting Up Web Interface Management On the CD-ROM, inserted into the CD-ROM drive of a networked CD-ROM server On a Web server If several users are using the web interface, we recommend that you copy the files onto a server, or insert the CD-ROM into a networked CD-ROM server.
Page 36: Setting Up Command Line Interface Management
2: S HAPTER ETTING P FOR ANAGEMENT Setting Up You can access the command line interface using: Command Line A terminal or terminal emulator connected to the console port of a Interface Switch directly, or through a modem Management A terminal or terminal emulator connected to a Switch over an IP network using Telnet Setting Up Through To manage a Switch using the command line interface through the...
Page 37: Setting Up Over The Network
Setting Up SNMP Management Setting Up Over the To manage a Switch using the command line interface over a network using Telnet: Network 1 You must set up the Switch with IP information. To do this: a Access the command line interface of the Switch through the console port.
Page 38: Managing A Switch Over The Network
2: S HAPTER ETTING P FOR ANAGEMENT Managing a Switch When managing a Switch over the network, the Switch must be correctly Over the Network configured with the following IP information: An IP address — for more information, see “IP Addresses” page A subnet mask —...
Page 39: Subnets And Using A Subnet Mask
Logging in as a Default User World Wide Web site: http://www.internic.net You can divide your IP network into sub-networks or subnets. Support for Subnets and Using a subnets is important because the number of bits assigned to the device Subnet Mask part of an IP address limits the number of devices that may be addressed on any given network.
Page 40 2: S HAPTER ETTING P FOR ANAGEMENT Table 5 Default Users User Default Name Password Access Level security security security — the user can access and change all manageable parameters admin security — the user can access and change all manageable password) parameters CAUTION: To protect your Switch from unauthorized access, you must...
Page 41: The Management Interfaces
ANAGEMENT NTERFACES Chapter 3 Working With the Web Interface Chapter 4 Working With the Command Line Interface...
Page 43: Working With The Web Interface
ORKING ITH THE NTERFACE This chapter describes how to access and use the web interface. It covers the following topics: Accessing the Web Interface The Getting Started Pages The Main Web Interface Configuring the Current Switch Changing the Management Settings for the Stack Configuring the Stack Displaying Statistics for the Current Switch Throughout this chapter, the term stack refers to a number of Switch...
Page 44: Accessing The Web Interface
3: W HAPTER ORKING ITH THE NTERFACE Accessing the Web You can access the web interface through the console port or over the Interface network. To access the web interface through the console port, you must install, configure and run the Serial Web Utility described in “Serial Web Utility”...
Page 45: Exiting The Web Interface
Accessing the Web Interface 4 Enter your user name and password: If you have been assigned a user name and password, enter those details. If you are accessing the web interface for the first time, enter a default user name and password to match your access requirements. The defaults are described in “Logging in as a Default User”...
Page 46: The Getting Started Pages
3: W HAPTER ORKING ITH THE NTERFACE The Getting Started When you access the web interface for the first time or after a Pages power-off/on cycle, a set of Getting Started pages are displayed. The first Getting Started page, Getting Started - Introduction is shown in Figure Figure 3 The Getting Started - Introduction page The Getting Started pages allow you to enter basic setup information for...
Page 47 The Getting Started Pages 3 The URL or file path of the online help and online documentation for the stack. If the files are installed on your management workstation, on the CD-ROM, or on a network server, you must begin the file path with file:// If the files are stored on a Web server, you must begin the URL with http://...
Page 48: The Main Web Interface
3: W HAPTER ORKING ITH THE NTERFACE The Main Web The main web interface is made up of three areas: Interface The Banner This is always displayed at the top of the browser window. It displays the name of the current Switch in the stack, and contains several External Link icons that allow you to access information outside of the web interface.
Page 49: The External Link Icons
Action If your management workstation has access to the World Wide Web, clicking the 3Com icon displays the home page of the 3Com World Wide Web site in a second browser window. If you have set up the online help, clicking the Help icon displays the help for the web interface in a second browser window.
Page 50: The Management Icons
3: W HAPTER ORKING ITH THE NTERFACE The Management The side-bar of the main web interface contains several Management Icons that allow you to display web pages in the page area; these are Icons shown in Table Table 7 Management Icons and their actions Management Icon Action Management Settings —...
Page 51 The Main Web Interface Unit Status — This page allows you to display the general administration details of the Switch. IP Setup — This page allows you to set up IP information for the Switch. Port Setup — This page allows you to configure individual ports on the Switch.
Page 52: Navigating The Page Area
3: W HAPTER ORKING ITH THE NTERFACE Roving Analysis Setup — This page allows you to set up roving analysis ports for the stack. Resilient Links — This page allows you to set up resilient links for the stack. Reset — This page allows you to reset the Switch units in the stack.
Page 53: Making Changes In The Page Area
The Main Web Interface Figure 5 Web interface map Making Changes in the Page Area If you change any setting on a page in the page area, you must click the Apply button at the bottom right of the page to make the change to the stack.
Page 54: Configuring The Current Switch
3: W HAPTER ORKING ITH THE NTERFACE Configuring the You can configure the current Switch and the ports on that Switch using Current Switch the Unit Pages. These pages allow you to: Display the status of the ports on the Switch Display the general administration details of the Switch Set up IP information for the Switch Configure individual ports on the Switch...
Page 55: Displaying The Speed And Duplex Mode Of Ports
Configuring the Current Switch Displaying the Speed and Duplex Mode of Ports You can display the speed and duplex mode of ports in the Switch graphic using the Port Summary page. To access the page: Click the Summary hotlink under the Switch graphic. The Port Summary page is displayed as shown in Figure Figure 7 The Port Summary page...
Page 56: Displaying Administration Details
3: W HAPTER ORKING ITH THE NTERFACE Displaying You can display general administration details about the Switch using the Unit Status page. Administration Details To access the page: Click the Unit icon on the side-bar. The Unit Status page is displayed as shown in Figure 8.
Page 57 Boot PROM Version Displays the version of Boot PROM software installed on the Switch. Product Number Displays the 3Com product number of the unit. TFTP Server (optionally displayed) Displays the IP address of the last TFTP server used to upgrade the unit’s management software.
Page 58: Setting Up Ip Information
3: W HAPTER ORKING ITH THE NTERFACE Setting Up IP You can set up the IP information for the Switch using the IP Setup page. Information To access the page: 1 Click the Unit icon on the side-bar. The Unit Status page is displayed. 2 Click the IP Setup hotlink on the Unit Status page.
Page 59: Configuring A Port
Configuring the Current Switch Default Router If your network contains one or more routers, this field allows you to enter the IP address of the default router. For more information about IP addresses, see “Managing a Switch Over the Network” page BOOTP On / Off If you have a BOOTP server on your network, these radio buttons allow...
Page 60 3: W HAPTER ORKING ITH THE NTERFACE Figure 10 The Port Setup page with auto-negotiation enabled Figure 11 The Port Setup page with auto-negotiation disabled...
Page 61 Configuring the Current Switch The Port Setup page contains the following elements: Port Displays the number of the selected port. Link State Enabled / Disabled Displays the state of the link connected to the port. Media Type Displays the media type of the link connected to the port. Port Speed Displays the current speed and duplex mode of the port.
Page 62 3: W HAPTER ORKING ITH THE NTERFACE Switch 610 and Switch 1100 only. The 10BASE-T/100BASE-TX ports on the Switch 1100 cannot auto-negotiate IEEE802.3x flow control. Follow the instructions below to enable flow control on the Switch 1100 10BASE-T/100BASETX ports. To enable flow control on the Switch 1100 10BASE-T/100BASE-TX ports: 1 From the Port Setup page, set the Auto-Negotiation listbox to disabled.
Page 63 Configuring the Current Switch HD Flow Control Enabled / Disabled Allows you to enable or disable the Intelligent Flow Management flow control that can be used when the port is operating in half duplex. Flow control prevents any packet loss that may occur on congested ports. The Half Duplex Flow Control listbox should be disabled if the port is connected to multiple devices using a hub.
Page 64 3: W HAPTER ORKING ITH THE NTERFACE FWD Unknown VLAN Tags Enabled / Disabled / Auto Allows you to specify whether the port forwards traffic that uses unknown IEEE 802.1Q tags. If 802.1Q VLAN learning is disabled, you can specify: Enabled —...
Page 65 Switch. For more information about VLT tagging, see “Placing a Port in Multiple VLANs” page 166. VLT tagging can only be used on links to legacy 3Com devices. A port cannot use VLT tagging if: It uses 802.1Q tagging — for more information about 802.1Q tagging, see “Placing a Port in Multiple VLANs”...
Page 66: Configuring The Console Port
3: W HAPTER ORKING ITH THE NTERFACE 802.1Q VLAN Learning Stack Default / Disabled Allows you to specify whether the port uses IEEE 802.1Q learning (GVRP) to place ports in VLANs automatically: Stack Default — The port takes the 802.1Q VLAN learning setting from the Advanced Stack Setup page.
Page 67: Changing The Management Settings For The Stack
Changing the Management Settings for the Stack The Console Port Configuration page contains the following elements: Console connection Terminal / Modem Allows you to specify the device that you are connecting to the console port. Port Speed AutoConfig / 1200 / 2400 / 4800 / 9600 / 19200 Allows you to specify the line speed (baud) of the console port.
Page 68: Changing Your Password
3: W HAPTER ORKING ITH THE NTERFACE Figure 13 The System Name page The Name field allows you to enter a descriptive name for the stack. The name can be up to 20 characters long. Changing Your You can change the password for your user using the Password Setting Password page.
Page 69: Specifying A Physical Location
Changing the Management Settings for the Stack The Password Setting page contains the following elements: New Password Allows you to enter a new password for your user. The password can be up to 10 characters long. Passwords must only contain alpha-numeric characters. Confirm Password Allows you to re-enter the new password.
Page 70: Specifying The Location Of The Online Help And Documentation
3: W HAPTER ORKING ITH THE NTERFACE Specifying the You can specify the location of the online help and documentation for the stack using the Documentation page. Location of the Online Help and To access the page: Documentation 1 Click the Management Settings icon on the side-bar. 2 Click the Documentation hotlink.
Page 71: Specifying Contact Details
Configuring the Stack Specifying Contact You can specify the details of a person to contact about the stack using the Contact page. Details To access the Contact page: 1 Click the Management Settings icon on the side-bar. 2 Click the Contact hotlink. The Contact page is displayed as shown in Figure Figure 17 The Contact page Configuring the...
Page 72: Configuring The Switch Database
3: W HAPTER ORKING ITH THE NTERFACE Configuring the You can configure the Switch Database of the stack using the Switch Database page. Switch Database To access the page: 1 Click the Configuration icon on the side-bar. 2 Click the Switch Database hotlink. The Switch Database page is displayed as shown in Figure What is the Switch Database?
Page 73: Displaying The Switch Database
Configuring the Stack Databases entries can have three states: Learned — The stack has placed the entry into the Switch Database when a packet was received from an endstation: Learned entries are removed (aged out) from the Switch Database if the stack does not receive packets from that endstation within a certain period of time (the ageing time).
Page 74: Inserting Permanent Entries
3: W HAPTER ORKING ITH THE NTERFACE To display a subset of the entries for the current unit: 1 From the Port Filter listbox, select a port that has submitted the relevant entries or All Ports. 2 From the VLAN Filter listbox, select the local ID of a VLAN associated with the relevant entries.
Page 75: Deleting Entries
Configuring the Stack The Display Database Entries table is not automatically updated with the new entry. To update the table: a From the Select Action Type listbox, select Display All. b Click the Apply button. When inserting a permanent entry, two error messages can be displayed in the Status column of the Display Database Entries table: You can only insert an entry for one port at a time;...
Page 76: Configuring The Advanced Stack Settings
3: W HAPTER ORKING ITH THE NTERFACE Configuring the You can configure the advanced settings of the stack using the Advanced Stack Setup page. Advanced Stack Settings To access the page: 1 Click the Configuration icon on the side-bar. 2 Click the Advanced Stack Setup hotlink. The Advanced Stack Setup page is displayed as shown in Figure Figure 19 The Advanced Stack Setup page...
Page 77 Configuring the Stack short time to be forwarded, but all error packets except fragments are propagated. Store and Forward — Received packets are buffered entirely before they are forwarded, which ensures that only good packets are forwarded to their destination. With Store and Forward, packets take slightly longer to be forwarded than with Fast Forward and Fragment Free, but no errors are propagated.
Page 78 3: W HAPTER ORKING ITH THE NTERFACE Ageing Time (Secs) 0 / 60 ... 1000000 Allows you to specify the ageing time (in seconds) for all learned entries in the Switch Database of the stack; the default time is 1800 seconds (30 minutes).
Page 79: Setting Up Resilient Links
Configuring the Stack Setting Up Resilient You can set up resilient links for the stack using the Resilient Links page. Links To access the page: 1 Click the Configuration icon on the side-bar. 2 Click the Resilient Links hotlink. The Resilient Links page is displayed as shown in Figure Figure 20 The Resilient Links page...
Page 80: Displaying Resilient Link Pairs
3: W HAPTER ORKING ITH THE NTERFACE Resilient link pairs can only be set up using fiber or twisted pair ports. The main and standby ports in the same pair, however, can use any combination of these media. A resilient link pair must only be defined at one end of the link. A resilient link pair must only be set up if: The ports belong to the same VLANs.
Page 81: Deleting A Resilient Link Pair
Configuring the Stack 3 Click the Next... button. 4 From the Main Link field, select the main port of the resilient link pair. 5 Click the Next... button. 6 From the Standby Link field, select the standby port of the resilient link pair.
Page 82: What Are Port Trunks
3: W HAPTER ORKING ITH THE NTERFACE Figure 21 The Port Trunk Setup page What are Port Trunks? Port trunks are connections that allow devices to communicate using up to four links in parallel. Port trunks provide two benefits: They can potentially double, triple or quadruple the bandwidth of a connection.
Page 83: Configuring Vlans
Configuring the Stack 3 Click a port in the Available Ports listbox. 4 Click the Add >> button. The port is assigned to the port trunk, and the port is displayed in the Trunk Members listbox. There are several conditions that need to be satisfied before a port can be placed in a port trunk.
Page 84: What Are Vlans
VLAN within the stack, and can be any number between 2 and 16 (VLAN 1, the Default VLAN, is already created and cannot be deleted). The Local ID corresponds to the VLAN IDs used in legacy 3Com devices.
Page 85: Deleting Vlan Information
Configuring the Stack You cannot edit the 802.1Q VLAN ID if ports are already assigned to the VLAN. Deleting VLAN Information The VLAN Setup page allows you to delete any VLAN information that you define in the Create VLAN page. To do this: 1 From the VLANs Available listbox, select a VLAN.
Page 86: Setting Up Roving Analysis Ports
3: W HAPTER ORKING ITH THE NTERFACE 5 To place the port in another VLAN, repeat steps 1 to 4 with that VLAN. To place a port back in the Available Ports listbox, click the port in the VLAN Members listbox and click the << Remove button. The VLAN Members listbox displays two types of port that do not use 802.1Q tagging: untagged ports and VLT tagged ports.
Page 87: What Is Roving Analysis
Configuring the Stack What is Roving Analysis? Roving analysis is a system that allows you to attach a network analyzer to one port and use it to monitor the traffic of other ports in the stack. The system works by enabling you to define an analysis port (the port that is connected to the analyzer), and a monitor port (the port that is to be monitored).
Page 88: Enabling The Roving Analysis System
3: W HAPTER ORKING ITH THE NTERFACE Enabling the Roving Analysis System The Roving Analysis Setup page allows you to enable the roving analysis system. To do this: 1 From the Roving Analysis State listbox, select Enabled. 2 Click Apply. Resetting All the You can reset all the Switch units in the stack using the Reset page.
Page 89: Upgrading Management Software
Configuring the Stack setting is the IP and SLIP information, which is retained to ensure that you can continue managing the stack. You may want to initialize the stack if it has previously been used in a different part of your network, and its settings are incorrect for the new environment.
Page 90 (VLAN 1). The server can only upgrade a stack if it is connected to the stack by the Default VLAN. You can download a TFTP server called 3CServer (filename: 3cs117.zip) from 3Com’s website . 3CServer can be installed http://www.3com.com and run on a Microsoft Windows® 95/98 or NT system.
Page 91: Displaying Statistics For The Current Switch
Displaying Statistics for the Current Switch Displaying Statistics You can display statistics for the current Switch in the stack using the for the Current Health pages. These pages allow you to: Switch Display a range of statistics for all the ports on the Switch Display a range of statistics for a specific port on the Switch Displaying Unit You can display a range of statistics for all the ports on the Switch using...
Page 92: Interpreting The Statistics
3: W HAPTER ORKING ITH THE NTERFACE To display the Total Errors graph: 1 From the listbox, choose Total Errors. 2 Click Apply. If you click a port on the Bandwidth Utilization or Total Errors graph, the graph for that port is displayed. Interpreting the Statistics The Bandwidth Utilization graph scales automatically to display the percentage of bandwidth used on all ports of the Switch over the last...
Page 93 Displaying Statistics for the Current Switch Figure 26 The graphs displayed by the Port Graph page You can choose to display graphs for Utilization, Total Errors or Packet Size distribution: To display the Utilization graph: 1 From the first listbox, choose a port. 2 From the second listbox, choose Utilization.
Page 94: Interpreting The Statistics
3: W HAPTER ORKING ITH THE NTERFACE To display the Packet Size Distribution graph: 1 From the first listbox, choose a port. 2 From the second listbox, choose Packet Size Distribution. 3 Click Apply. Interpreting the Statistics The Utilization graph scales automatically to display the percentage of bandwidth used on the port over the last hour and last 48 hours: A bandwidth utilization of 0–25% indicates that the port is dealing with a light traffic load.
Page 95: Working With The Command Line Interface
ORKING ITH THE OMMAND NTERFACE This chapter describes how to access and use the command line interface. It covers the following topics: Accessing the Interface About the Interface Menus A Quick Guide to the Commands Displaying and Changing Bridging/VLANs Information Displaying and Changing Port Information Displaying and Changing System Feature Information Displaying and Changing IP-related Information...
Page 96: Accessing The Interface
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Accessing the To access the command line interface, take the following steps: Interface 1 Set up your network for command line interface management; for more information, see “Setting Up Command Line Interface Management” page 36.
Page 97: How Many Users Can Access The Interface
About the Interface Menus How Many Users Can The command line interface can be accessed by several users at the same time: Access the Interface? If the stack contains multiple Switch units, the command line interface can be accessed through each console port in the stack at the same time.
Page 98 4: W HAPTER ORKING ITH THE OMMAND NTERFACE Feature menu This menu contains commands that allow you to configure Roving Analysis Port, enable or disable Broadcast Storm Control, set up or remove resilient links, and configure Trunks on the Switch. IP menu This menu contains commands that allow you to view and change IP-related information for the stack and ping other devices in your...
Page 99: Entering Commands
About the Interface Menus Figure 28 Command line interface menu structure Entering Commands The command area of the command line interface contains a Select prompt that allows you to enter the commands in the menu option menu area Commands are not case-sensitive. To enter a simple command: At the prompt, enter the name of the command.
Page 100: Displaying Menus
4: W HAPTER ORKING ITH THE OMMAND NTERFACE To enter multiple commands: At the prompt, enter each command in succession. For example, to display the system menu and reset the Switch units in the stack, enter: system reset To enter commands that require values: Append the values to the name of the command.
Page 101: A Quick Guide To The Commands
A Quick Guide to the Commands A Quick Guide to Table 8 describes the commands that are available in the command line the Commands interface. Table 8 Command line interface commands Command What does it do? Exits the current user from the command line logout interface.
Page 102 4: W HAPTER ORKING ITH THE OMMAND NTERFACE Table 8 Command line interface commands Command What does it do? Enables or disables VLT tagging on a port on bridge port vltMode the current Switch unit. Sets the bridge Forward Delay spanning tree bridge stpForwardDelay parameter.
Page 103 A Quick Guide to the Commands Table 8 Command line interface commands Command What does it do? feature analyzer display Displays information about the roving analysis port configured in the stack. Removes the designated roving analysis port feature analyzer remove from the current port.
Page 104 4: W HAPTER ORKING ITH THE OMMAND NTERFACE Table 8 Command line interface commands Command What does it do? Performs an SNMP GET command, that allows snmp get you to retrieve values of SNMP objects from the stack. Performs an SNMP GETNEXT command, that snmp next allows you to specify an SNMP object and then retrieve the next few SNMP objects from the...
Page 105: Displaying And Changing Bridging/Vlans Information
Displaying and Changing Bridging/VLANs Information Table 8 Command line interface commands Command What does it do? Modifies user details for the stack. system security user modify Removes user details from the stack. system security user remove Allows you to upgrade the management system softwareUpgrade software of the Switch units in the stack.
Page 106 4: W HAPTER ORKING ITH THE OMMAND NTERFACE To display the statistical information: 1 At the Top-level menu, enter: bridge display 2 The bridge information for the Switch is displayed as shown in the following example. stpState: disabled agingTime: 1800 Time since topology change: 0 hrs 0 mins 0 seconds Topology Changes:...
Page 107: Enabling And Disabling Igmp Snooping
Displaying and Changing Bridging/VLANs Information — Displays the maximum age in seconds at which the stored maxAge configuration message information is judged to be too old and is discarded. This value is determined by the root bridge. — Displays the Hello time value, used when this bridgeHelloTime bridge is the root bridge.
Page 108: Enabling And Disabling Router Port Auto-Discovery
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Enabling and You can enable or disable router port auto-discovery for all Switch units in the stack using the command on the Router Port menu. Disabling Router Port autoDiscovery Auto-Discovery The default setting for the Switch is router port auto-discovery enabled, with no manually identified router ports.
Page 109: Removing A Router Port
Displaying and Changing Bridging/VLANs Information 2 The router port information for all Switch units in the stack is displayed in ascending unit and port number order. An example of the router port information is shown below: Unit Port Learning State Auto Manual Manual...
Page 110: Adding A Statically Configured Address To A Switch Database
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Adding a Statically You can add a statically configured address to a switch database using command on the Address menu. Configured Address to a Switch Database To add an address to a port: 1 At the Top-level menu, enter: bridge port address add The following prompt is displayed:...
Page 111: Displaying Mac Addresses For A Port
Displaying and Changing Bridging/VLANs Information Displaying MAC You can display a list of MAC addresses associated with a selected port using the command on the Address menu. Addresses for a Port list To display a list of MAC addresses: 1 At the Top-level menu, enter: bridge port address list The following prompt is displayed: Select bridge ports (1-12, all):...
Page 112: Setting The Spanning Tree Path Cost
4: W HAPTER ORKING ITH THE OMMAND NTERFACE 2 Enter the number of a port on the Switch unit. If the port selected is working in VLT mode the display will show the port as being a member of all current VLANs with shown as Tagging The port information for the Switch is displayed as shown in the example...
Page 113: Displaying Port Summary Information
Displaying and Changing Bridging/VLANs Information 2 Enter the number of the port to be enabled or disabled. The following prompt is displayed: Enter new value (disable, enable) [disable]: 3 Enter enable disable Displaying Port You can display summary information about a port, or all ports, of the Summary current Switch unit using the command on the Port menu.
Page 114: Enabling And Disabling Vlt Tagging On A Port
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Blocking - equivalent to STP blocking state Listening - equivalent to STP listening state Learning - equivalent to STP learning state Forwarding - equivalent to STP forwarding state Broken - port is broken —...
Page 115: Setting The Bridge Spanning Tree Hello Timer
Displaying and Changing Bridging/VLANs Information Setting the Bridge You can set the bridge hello timer spanning tree parameter of the current Switch using the command on the Bridge menu. Spanning Tree Hello stpHelloTime Timer To set the bridge spanning tree hello timer: 1 At the Top-level menu, enter: bridge stpHelloTime The following prompt is displayed:...
Page 116: Enabling And Disabling Spanning Tree On A Bridge
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Enabling and You can enable or disable spanning tree on a bridge of the current Switch unit using the command on the Bridge menu. Disabling Spanning stpState Tree on a Bridge To enable or disable spanning tree on a bridge: 1 At the Top-level menu, enter: bridge stpState The following prompt is displayed:...
Page 117: Deleting A Vlan
Displaying and Changing Bridging/VLANs Information The following prompt is displayed: Enter VLAN ID (2-4094) [3]: 2 Enter the number of the VLAN ID that you wish to create. The default option is the lowest value within the VLAN ID range not currently used in the stack.
Page 118: Modifying A Vlan
4: W HAPTER ORKING ITH THE OMMAND NTERFACE The following prompt is displayed: Select VLAN ID (1-4094) [1]: 2 Enter the VLAN ID that you wish to display. The detailed VLAN information for the selected VLAN ID is displayed as shown in the example below.
Page 119: Removing A Port From A Vlan
Displaying and Changing Bridging/VLANs Information Removing a Port from You can remove a single port from a VLAN, or remove all ports on the current Switch unit from the selected VLAN using the a VLAN removePort command on the VLAN menu. To remove a port from a VLAN: 1 At the Top-level menu, enter: bridge vlan removePort...
Page 120: Displaying And Changing Port Information
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Displaying and You can display and change information about the ports on the current Changing Port Switch unit in the stack using the commands on the Ethernet menu. Information These commands allow you to: Enable and disable Ethernet ports on the Switch Specify the speed and duplex mode of Ethernet ports on the Switch Enable and disable auto-negotiation for Ethernet ports on the Switch...
Page 121: Specifying The Speed And Duplex Mode
Displaying and Changing Port Information Specifying the Speed You can specify the speed and duplex mode of Ethernet ports on the Switch using the command on the Ethernet menu. and Duplex Mode portMode To specify the speed and duplex mode of a port: 1 At the Top-level menu, enter: ethernet portMode The following prompt is displayed:...
Page 122 4: W HAPTER ORKING ITH THE OMMAND NTERFACE If auto-negotiation is enabled on a 10BASE-T port, the duplex mode of the link is automatically detected and set accordingly. CAUTION: The duplex mode of a link is not detected if the port on the other end of the link is not auto-negotiating.
Page 123: Enabling And Disabling Flow Control
Displaying and Changing Port Information Enabling and IEEE 802.3x flow control prevents any packet loss that may occur on congested ports that are operating in full duplex. Disabling Flow Control You can enable or disable IEEE 802.3x flow control for Ethernet ports on the Switch using the command on the Ethernet menu.
Page 124 4: W HAPTER ORKING ITH THE OMMAND NTERFACE Figure 29 Ethernet Statistics Port: Port Speed: 10Mbps HD Auto Received Stats Transmit Stats Unicast Packets: Unicast Packets: Non Unicast Packets: Non Unicast Packets: 18734 Octets: Octets: 1397087 Fragments: Collisions: Errors Undersize: Oversize CRC Errors: Jabbers...
Page 125 Displaying and Changing Port Information Transmitted Stats — Displays the number of packets with a single Unicast Packets destination address that have been transmitted by the port. — Displays the number of packets with a Non Unicast Packets multicast or broadcast destination address that have been successfully transmitted by the port.
Page 126: Packet Size Analysis
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Packet Size Analysis Displays the number of packets seen by the port that had a length which was in one of six ranges between 64 and 1518 octets. This information may help you to analyze the efficiency of your network layer protocol. Displaying Port You can display summary information about Ethernet ports on the Switch Summary...
Page 127: Displaying And Changing System Feature Information
Displaying and Changing System Feature Information Displaying and You can display and change system feature information for the Switch Changing System units in the stack using the commands on the Feature menu. These Feature commands allow you to: Information Set up Roving Port Analysis. Enable or disable Broadcast Storm Control.
Page 128: Removing A Roving Analysis Port
4: W HAPTER ORKING ITH THE OMMAND NTERFACE The roving analysis port information is displayed as shown in the example below. Monitor Port Analysis Port State Unit 2 Port 12 Unit 1 Port 10 Enabled Select menu option: Removing a Roving You can remove the roving analysis port using the command on remove...
Page 129: Stopping Data Monitoring
Displaying and Changing System Feature Information Stopping Data You can stop data monitoring by the roving analysis port and remove the monitor port from the roving analysis set up by using the command Monitoring stop on the Analyzer menu. To stop data monitoring by the roving analysis port and remove the monitor port: At the Top-level menu, enter: feature analyzer stop...
Page 130: Setting Up A Resilient Link
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Setting Up a Resilient You can set up resilient links on the Switch units within the stack using command on the Resilience menu. Link define To set up a resilient link: 1 At the Top-level menu, enter: feature resilience define The following prompt is displayed: Select unit for main link (1-4):...
Page 131: Removing A Resilient Link
Displaying and Changing System Feature Information Removing a Resilient You can remove resilient links from the Switch units within the stack using the command on the Resilience menu. Link remove To remove a resilient link: 1 At the Top-level menu, enter: feature resilience remove The following prompt is displayed: Select resilient link index (1,2):...
Page 132: Displaying Detailed Trunk Information
4: W HAPTER ORKING ITH THE OMMAND NTERFACE 3 Enter the port number that you wish to add to the trunk. (The choice of port numbers reflects suitable candidate ports.) You can not add a port to a trunk that is already a member of a trunk, is part of a resilient link, is in VLT mode, or is selected as the copy port or study port.
Page 133: Displaying Summary Trunk Information
Displaying and Changing IP-related Information Displaying Summary You can display summary trunk information about all trunks supported by the stack using the command on the Trunk menu. Trunk Information summary To display summary trunk information: 1 At the Top-level menu, enter: feature trunk summary 2 The summary trunk information is displayed as shown in the example below.
Page 134 4: W HAPTER ORKING ITH THE OMMAND NTERFACE To specify the IP and SLIP information: 1 At the Top-level menu, enter: ip interface define The following prompt is displayed, allowing you to enter an IP address for the Switch: Enter IP address [0.0.0.0]: For more information about IP addresses, see “IP Addresses”...
Page 135: Displaying Ip And Slip Information
Displaying and Changing IP-related Information Displaying IP and SLIP You can display IP and SLIP information for the current Switch unit in the stack using the command on the IP/Interface menu. Information display For more information about IP and SLIP, see “Managing a Switch Over the Network”...
Page 136: Pinging Other Devices
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Pinging Other The PING feature allows you to send out a PING request to test whether devices on an IP network are accessible and functioning correctly. This Devices feature is useful for testing that the stack is installed and set up correctly, and that your network connections are working.
Page 137: Displaying And Changing Snmp-Related Information
Displaying and Changing SNMP-related Information Displaying and You can display and change SNMP-related information for the stack using Changing the commands on the SNMP menu. These commands allow you to: SNMP-related Specify SNMP community strings for the stack Information Specify the trap destination details for the stack Display the trap destination details for the stack Modify trap destination details for the stack Remove trap destination details for the stack...
Page 138: Displaying Trap Destination Details
4: W HAPTER ORKING ITH THE OMMAND NTERFACE 2 Enter the community string of the trap destination device. The following prompt is displayed: Enter the trap destination address: 3 Enter the IP address of the trap destination device. Displaying Trap You can display the community string and IP address of the current trap Destination Details destination devices using the...
Page 139: Removing Trap Destination Details
Displaying and Changing SNMP-related Information Removing Trap You can remove the details of a current trap destination device using the command on the SNMP/Trap menu. Destination Details remove To remove trap destination details: 1 At the Top-level menu, enter: snmp trap remove The following prompt is displayed: Select trap index (1,2,3,all): 2 Enter the index number of the trap destination device that is to have its...
Page 140: Performing An Snmp Set Command
4: W HAPTER ORKING ITH THE OMMAND NTERFACE The following prompt is displayed: Enter object-identifier: 2 Enter the identifier of an SNMP object. The following prompt is displayed: Enter count: 3 Enter the number of SNMP objects after the object specified for which you want to retrieve information.
Page 141: Displaying And Changing Stack Information
Displaying and Changing Stack Information Displaying and You can display and change information about the Switch units in the Changing Stack stack or the stack as a whole using the commands on the System menu. Information These commands allow you to: Move the focus of the command line interface from one Switch unit in the stack to another Specify administration details for the stack...
Page 142: Returning The Focus To The Previous Switch Unit
4: W HAPTER ORKING ITH THE OMMAND NTERFACE You can have up to four Switch units in a stack: If the stack contains one unit, that unit is unit 1. If the stack contains two units connected using a Matrix Cable, the unit with the lowest MAC address is unit 1 and the other unit is unit 2.
Page 143: Displaying Switch Administration Details
The administration details are displayed. An example of the details is shown below. Some fields are only displayed after a software upgrade failure and these provide information about the software upgrade. 3Com SuperStack II System Name: Development Location: Wiring Closet, Floor 1...
Page 144: Displaying Stack Summary Information
Displays the version of Boot PROM software installed on the unit. MAC Address Displays the MAC (Ethernet) address of the unit. Product Number Displays the 3Com product number of the unit. Serial Number Displays the serial number of the unit. TFTP Server (optionally displayed) Displays the IP address of the last TFTP server used to upgrade the unit’s...
Page 145 Displaying and Changing Stack Information To display the information: From the Top-level menu, enter: system inventory The summary information is displayed. An example of the summary information is shown below: Position Description Unit Name State Switch 1100 26 Accounts Operational Switch 3300 24 Development Operational...
Page 146: Configuring Intelligent Modules
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Configuring You can configure intelligent modules such as the Switch Layer 3 Module and the Switch ATM Expansion module. Intelligent Modules Setting Module Configuration You can set the IP configuration for an intelligent module using the command on the Module menu.
Page 147: Changing Your Password
Displaying and Changing Stack Information 2 Enter enable disable You can change the password for the current user using the Changing Your password command on the System menu. Password To change the password: 1 At the Top-level menu, enter: system password The following prompt appears, allowing you to enter the existing password: old password...
Page 148: Displaying User Details
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Enter the access level (monitor,manager,security) [security]: 3 Enter an access level for the new user. The following prompt is displayed: Enter the password: 4 Enter a password for the new user. The following prompt is displayed: Re-enter the password: 5 Enter the password for the new user again.
Page 149: Removing User Details
Displaying and Changing Stack Information 2 Enter the name of the user to be modified. The following prompt is displayed: Enter the password: 3 Enter a password for the user. The following prompt is displayed: Re-enter the password: 4 Enter the password for the user again. The following prompt is displayed: Enter the community string [<user>]: 5 Enter a community string for the user.
Page 150: Modifying Access Rights
4: W HAPTER ORKING ITH THE OMMAND NTERFACE Modifying Access You can modify access rights for the access levels in the stack using the command on the System/Security/Access menu. Rights modify To modify the access rights for the stack: 1 From the Top-level menu, enter: system security access modify The following prompt is displayed: Enter access level (monitor,manager,security):...
Page 151: Resetting All The Units In The Stack
Displaying and Changing Stack Information Users cannot access the stack over the network using the web interface. Users cannot access the Switch using an SNMP Network Manager. Users can only access the command line interface or web interface using a direct connection to the console port of a Switch unit in the stack.
Page 152: Initializing All The Units In The Stack
4: W HAPTER ORKING ITH THE OMMAND NTERFACE The stack takes about 10 seconds to reset. While the stack is resetting, you cannot communicate with it. You can initialize all the Switch units in the stack using the Initializing All the initialize Units in the Stack command on the System menu.
Page 153: Upgrading Management Software
(VLAN 1). The server can only upgrade a stack if it is connected to the stack by the Default VLAN. You can download a TFTP server called 3CServer (filename: 3cs117.zip) from 3Com’s website . 3CServer can be installed http://www.3com.com and run on a Microsoft Windows® 95/98 or NT system.
Page 154 4: W HAPTER ORKING ITH THE OMMAND NTERFACE...
Page 155: Management Reference
ANAGEMENT EFERENCE Chapter 5 Port Trunks Chapter 6 Virtual LANs (VLANs) Chapter 7 FastIP Chapter 8 Multicast Filtering Chapter 9 Spanning Tree Protocol Chapter 10 RMON...
Page 157: Port Trunks
RUNKS Port trunks are connections that allow devices to communicate using up to four links in parallel. This chapter explains more about port trunks and how to set them up on your network. It covers the following topics: What are Port Trunks? Port Trunks and Your Switch Placing Ports in a Port Trunk Port Trunk Example...
Page 158: What Are Port Trunks
5: P HAPTER RUNKS What are Port Port trunks are connections that allow devices to communicate using up Trunks? to four links in parallel. These parallel links provide two benefits: They can potentially double, triple or quadruple the bandwidth of a connection.
Page 159: Placing Ports In A Port Trunk
Placing Ports in a Port Trunk When setting up a port trunk, note that: The ports at both ends of a connection must be configured as trunk ports. The trunk ports can only belong to one port trunk. The trunk ports must be fiber or twisted pair ports. The trunk ports must be from the same Switch in the stack.
Page 160: Port Trunk Example
5: P HAPTER RUNKS Port Trunk Example The example shown in Figure 31 illustrates an 800Mbps port trunk between two Switch units. Figure 31 An 800Mbps port trunk between two Switch units To set up this configuration: 1 Prepare ports 13, 15, 17 and 19 on the higher Switch for port trunking: a Use the web interface to ensure that the ports have an identical configuration: b Use the Port Trunk Setup page of the web interface to specify that...
Page 161 Port Trunk Example 2 Prepare ports 1, 3, 5 and 7 on the lower Switch for port trunking: a Use the web interface to ensure that the ports have an identical configuration: b Use the Port Trunk Setup page of the web interface to specify that ports 1, 3, 5 and 7 are ports of the port trunk.
Page 162 5: P HAPTER RUNKS...
Page 163: Virtual Lan S (Vlan S )
(VLAN IRTUAL Setting up Virtual Local Area Networks (VLANs) on your Switch reduces the time and effort required by many network administration tasks, and increases the efficiency of your network. This chapter explains more about the concept of VLANs and explains how they can be implemented on your Switch.
Page 164: What Are Vlans
6: V (VLAN HAPTER IRTUAL What are VLANs? A VLAN is a flexible group of devices that can be located anywhere in a network, but they communicate as if they are on the same physical segment. With VLANs, you can segment your network without being restricted by physical connections —...
Page 165: Vlans And Your Switch
VLAN IDs used in legacy 3Com devices. Support for VLT tagging VLT (Virtual LAN Trunk) tagging is a proprietary 3Com system that allows a port to be placed in all the VLANs defined for your Switch. The Default VLAN A new or initialized Switch contains a single VLAN, the Default VLAN.
Page 166: Defining New Vlans
6: V (VLAN HAPTER IRTUAL Defining New VLANs If you want to move a port from the Default VLAN to another VLAN, you must first define information about the new VLAN on your Switch. To do this, you use the VLAN Setup page of the web interface; see “Defining VLAN Information”...
Page 167: Vlt Tagging
VLT Tagging This method of tagging is a proprietary system developed by 3Com, and allows a link to carry traffic for all the VLANs defined on your Switch. VLT tagging can only be used on links to legacy 3Com devices.
Page 168: Forwarding Traffic Containing Unknown 802.1Q Tags
6: V (VLAN HAPTER IRTUAL The system works as follows: 1 The configured 802.1Q endstation sends out a packet with a known multicast address to the whole network — this packet declares that the endstation is to receive traffic for specific VLANs. 2 When the packet arrives at a port on a Switch with 802.1Q learning enabled, the Switch places the receiving port in the VLANs specified and then forwards the packet to all other ports.
Page 169 VLANs and Your Switch Figure 32 Forwarding unknown 802.1Q tags...
Page 170: Connecting Vlans To Other Vlans
Your Switch supports VLANs using the IEEE 802.1Q VLAN standard, on Legacy Switch however legacy Switch units (for example, the SuperStack II Switch 1000) Units do not use this system. If you want to connect the VLANs on your Switch...
Page 171: Vlan Configuration For Beginners
VLAN Configuration for Beginners VLAN This section contains examples of simple VLAN configurations. It Configuration for describes how to set up your switch to support simple untagged and Beginners tagged connections. For more advanced configuration examples, see “VLAN Configuration - Advanced Examples” page 177 Simple Example: The simplest VLAN operates in a small network using a single switch.
Page 172: Simple Example: Untagged Connections With Hubs
Dual Speed Hub 500 and a Switch 3300 connected using untagged connections. The Switch 3300 has a SuperStack II Switch Layer 3 Module installed, which allows it to provide Layer 3 switching which means that traffic can be passed between VLAN 1 and VLAN 2.
Page 173 VLAN Configuration for Beginners Figure 34 Simple example: Untagged connections using hubs...
Page 174: Simple Example: 802.1Q Tagged Connections
6: V (VLAN HAPTER IRTUAL To set up the configuration shown in Figure 1 Configure the VLANs Use the VLAN Setup page of the web interface to define VLAN 2 on the Switch 3300. VLAN 1 is the default VLAN and already exists. Do not add the ports to the VLAN using this screen.
Page 175 VLAN Configuration for Beginners Figure 35 Simple example: 802.1Q tagged connections To set up the configuration shown in Figure 1 Configure the VLANs on Switch 1 Use the VLAN Setup page of the web interface to define VLAN 2. VLAN 1 is the default VLAN and already exists.
Page 176 6: V (VLAN HAPTER IRTUAL 3 Add tagged port 26 on Switch 1 Use the VLAN Setup page of the web interface to assign port 26 on Switch 1 to both VLANs 1 and 2 so that all VLAN traffic is passed over the link.
Page 177: Vlan Configuration - Advanced Examples
VLAN Configuration - Advanced Examples VLAN The examples below describe how you can extend the functionality of Configuration - simple VLANs to provide more features and functionality within your Advanced Examples network. The example shown in Figure 36 shows a network that has endstations Using 802.1Q Tagged Connections and that support IEEE 802.1Q and network devices that have 802.1Q learning...
Page 178: Connecting To A Legacy Network
6: V (VLAN HAPTER IRTUAL To set up the configuration shown in Figure 1 Configure the endstations attached to the left Switch 1100 so that they belong to VLANs 1, 2 and 3. 2 Configure the endstations attached to the right Switch 1100 so that they belong to VLANs 4, 5 and 6.
Page 179 VLAN Configuration - Advanced Examples b Use the VLAN Setup page of the web interface to place ports 4 and 7 in VLANs 1 and 2 using 802.1Q tagging. c Use the Port Setup page of the web interface to specify that port 26 uses VLT tagging.
Page 180 6: V (VLAN HAPTER IRTUAL...
Page 181: Fast Ip
FastIP reduces the load on routing devices when VLANs are implemented on your network. This chapter explains more about the concept of FastIP and how it is enabled on your Switch. It covers the following topics: What is FastIP? How FastIP Works An Example FastIP and the Switch Database Enabling FastIP...
Page 182: What Is Fastip
The Switch nearest to the routing device has FastIP enabled The rest of the Switch units use a shared Switch Database for all VLANs (the SuperStack II Switch 1000, Switch 3000 and Desktop Switch units use this system). For more information about shared Switch Databases, see “FastIP and the Switch Database”...
Page 183: An Example
An Example 5 Endstation B sends an NHRP packet with its own details back to endstation A. This packet, however, is sent directly through the Switch units and not through the routing device. To do this, endstation B specifies that: The packet is sent to the VLANs that endstation A can receive.
Page 184 7: F HAPTER Figure 38 Network without FastIP Figure 39 Endstation A sends an NHRP packet to endstation B...
Page 185 An Example Figure 40 Endstation B sends an NHRP packet to endstation A Figure 41 Endstation A sends data packets to endstation B...
Page 186: Fastip And The Switch Database
7: F HAPTER FastIP and the By default, the Switch Database of a Switch is divided by VLAN — each Switch Database VLAN has an independent area of the database. With this system, the Switch Database can store an entry for a device in several VLANs at the same time, and the entry for a particular VLAN can be stored against different ports.
Page 187: Enabling Fastip
Enabling FastIP When FastIP is used by the Switch, the Switch Database can no longer be divided by VLAN — it must be shared by all the VLANs. Although the VLANs are still operational, this creates two limitations: The Switch Database can store an entry for a device in several VLANs at the same time, however, the entries can only be stored against one port (as shown in Figure...
Page 188 7: F HAPTER...
Page 189: Multicast Filtering
ULTICAST ILTERING Setting up multicast filtering improves the performance of networks that carry multicast traffic. This chapter explains multicasts, multicast filtering, and how multicast filtering can be implemented on your Switch. It covers the following topics: What is a Multicast? What is Multicast Filtering? Multicast Filtering and Your Switch...
Page 190: What Is A Multicast
8: M HAPTER ULTICAST ILTERING What is a A multicast is a packet that is sent to a subset of endstations in a LAN, or Multicast? VLAN, that belong to a multicast group. If the network is set up correctly, a multicast can only be sent to an endstation if it has joined the relevant group.
Page 191: Multicast Filtering And Your Switch
Multicast Filtering and Your Switch Multicast Filtering Your Switch provides automatic filtering support for two multicast and Your Switch systems: IEEE 802.1p, which uses the GARP Multicast Registration Protocol (GMRP) IGMP (Internet Group Management Protocol) In addition, you can manually configure the filtering and forwarding of multicasts using Transcend ®...
Page 192: Igmp Multicast Filtering
8: M HAPTER ULTICAST ILTERING IGMP Multicast IGMP is the system that all IP-supporting network devices use to register endstations with multicast groups. It can be used on all LANs and VLANs Filtering that contain an IP router and other network devices which support IP. IGMP multicast filtering works as follows: 1 The IP router (or querier) periodically sends query packets to all the endstations in the LANs or VLANs that are connected to it.
Page 193: Spanning Tree Protocol
PANNING ROTOCOL Using the Spanning Tree Protocol makes your network more resilient to link failure and also provides a protection from loops — one of the major causes of broadcast storms. This chapter explains more about the protocol and the protocol features supported by your Switch.
Page 194: What Is Stp
9: S HAPTER PANNING ROTOCOL What is STP? Using the Spanning Tree Protocol (STP) makes your network more resilient to link failure and also provides a protection from loops — one of the major causes of broadcast storms. STP is a bridge-based system that allows you to implement parallel paths for network traffic and uses a loop-detection process to: Find and disable the less efficient paths (that is, the paths that have a lower bandwidth).
Page 195 What is STP? Figure 46 Traffic flowing through Bridges C and A Figure 47 Traffic flowing through Bridge B STP determines which is the most efficient path between each bridged segment and a specifically assigned reference point on the network. Once the most efficient path has been determined, all other paths are disabled.
Page 196: How Stp Works
9: S HAPTER PANNING ROTOCOL How STP Works STP Requirements Before it can configure the network, the STP system requires the following: 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.
Page 197: Stp Calculation
How STP Works STP Calculation The first stage in the STP process is the calculation stage. During this stage, each bridge on the network transmits BPDUs that allow the system to work out: The identity of the bridge that is to be the Root Bridge — the central reference point from which the network is configured.
Page 198: An Example
9: S HAPTER PANNING ROTOCOL An Example Figure 48 shows a LAN that has STP enabled. The LAN has three segments, and each segment is connected using two possible links. Figure 48 Port costs in a network...
Page 199: Stp Configurations
C. Figure 49 (overleaf) shows three possible STP configurations using STP Configurations SuperStack II Switch units. Configuration 1 — Redundancy for Backbone Link In this configuration, a Switch 1100 and a Switch 3300 both have STP enabled and are connected by two links. STP discovers a duplicate path and disables one of the links.
Page 200 9: S HAPTER PANNING ROTOCOL Figure 49 STP configurations...
Page 201: Using Stp On A Network With Multiple Vlans
Using STP on a Network with Multiple VLANs Using STP on a Your Switch does not take into account VLANs when it calculates STP Network with information — the calculations are only performed on the basis of Multiple VLANs duplicate connections. For this reason, some network configurations can result in VLANs being subdivided into a number of isolated sections by the STP system.
Page 202: Connecting To Stp Systems On Legacy Switch Units
Switch Units Your Switch supports one STP system; however legacy Switch units (for example, the SuperStack II Switch 1000) may support one STP system per VLAN. Consequently: If the legacy Switch units use a single VLAN and you connect your...
Page 203: Rmon
What is RMON? Benefits of RMON RMON and Your Switch You can only use the RMON features of the Switch if you have an RMON management application, such as the RMON application supplied with ® 3Com Transcend Enterprise Manager software.
Page 204: What Is Rmon
10: RMON HAPTER What is RMON? RMON is the common abbreviation for Remote Monitoring, a system defined by the IETF that allows you to monitor the traffic of LANs or VLANs remotely. A typical RMON setup consists of two components: The RMON probe —...
Page 205: Hosts
What is RMON? Hosts The Hosts group specifies a table of traffic and error statistics for each host (endstation) on a LAN segment or VLAN. Statistics include packets sent and received, octets sent and received, as well as broadcasts, multicasts, and error packets sent. The group supplies a list of all hosts that have transmitted across the network.
Page 206: Benefits Of Rmon
10: RMON HAPTER Benefits of RMON Using the RMON features of your Switch has three main advantages: It improves your efficiency Using RMON probes allows you to remain at one workstation and collect information from widely dispersed LAN segments or VLANs. This means that the time taken to reach a problem site, set up equipment, and begin collecting information is largely eliminated.
Page 207: Rmon And Your Switch
RMON and Your Switch RMON and Your Your Switch contains an RMON probe in its management software. Switch Table 10 details the RMON support provided by this probe. Table 10 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.
Page 208: The Alarm Events
10: RMON HAPTER sessions, the forwarding performance of the Switch is not affected but you may experience slow response times from the web interface. You can define up to 200 alarms for the Switch. The events that you can The Alarm Events define for each alarm are shown in Table 11.
Page 209: The Audit Log
RMON and Your Switch Table 12 Values for the default alarms Low Threshold Statistic High Threshold Recovery Period Broadcast bandwidth Value: 20% Value: 10% 20 secs used Action: Notify and Action: Notify and filter unfilter Percentage of errors Value: 20 errors per Value: 1 error per 60 secs over one minute...
Page 210 10: RMON HAPTER...
Page 211: Problem Solving
ROBLEM OLVING Chapter 11 Problem Solving...
Page 213 ROBLEM OLVING This chapter contains a list of known problems and suggested solutions. It covers the following topics: Solving Web Interface Problems Solving Command Line Interface Problems Solving SNMP Management Software Problems Solving Serial Web Utility Problems Solving Management Software Upgrade Utility Problems Solving Other Problems If you have a problem that is not listed here and you cannot solve it, please contact your local technical support representative.
Page 214: Solving Web Interface Problems
150. The Web browser cannot access the Switch over a serial link from ® a management station running Windows 95. You must access the Switch using the 3Com Serial Web Utility (SLIP Driver); see “Serial Web Utility” page 227. The Web browser can no longer access the Switch over the network.
Page 215 For more information, see “Installing Online Help and Documentation” page "URL not found" messages are displayed when the 3Com Library, 3Com Contacts or 3Com Support icons are clicked. Your management workstation cannot access the World Wide Web. Contact your network administrator.
Page 216: Solving Command Line Interface Problems
In the case where no-one knows a password for a user with Security access level, the Switch needs to be sent back to your supplier so that it can be returned to 3Com. A management software upgrade has failed, and you can no longer manage the Switch using the web interface.
Page 217 Solving Command Line Interface Problems The settings on your terminal or terminal emulator are correct: 8 data bits no parity 1 stop bit The auto-configuration feature of the Switch only works with line speeds from 1200 to 19,200 baud. If you are managing the Switch over the network: Remote access to the management software of the Switch is enabled.
Page 218: Solving Snmp Management Software Problems
In the case where no-one knows a password for a user with Security access level, the Switch needs to be sent back to your supplier so that it can be returned to 3Com. A management software upgrade has failed, and you can no longer manage the Switch using the command line interface.
Page 219: Solving Serial Web Utility Problems
Solving Serial Web Utility Problems The port through which you are trying to manage the Switch belongs to the Default VLAN (VLAN 1). This is the only VLAN that can be used to access the management software of the Switch. Traps are not received by the SNMP Network Management software.
Page 220: Solving Management Software Upgrade Utility Problems
11: P HAPTER ROBLEM OLVING You can change some of the settings for the management workstation using the Advanced Configuration Parameters dialog box. To display this, select the Serial Web Setup program item in the Serial Web program group. Solving An error occurs when the utility attempts to connect through the Management serial port of the PC.
Page 221: Solving Other Problems
Solving Other Problems An error occurs when the utility attempts to transfer the file. There could be a number of reasons for this: The null modem cable has become disconnected from the Switch or the PC during the file transfer. Reconnect the cable and start again. Power to the Switch has been disrupted during the file transfer.
Page 222 11: P HAPTER ROBLEM OLVING You have specified that an endstation generates traffic that has a high priority, but when it passes through the network this priority information is lost. The endstation is attached to a Switch port using an untagged VLAN connection, and the Switch is removing the priority information when it is forwarded to other untagged ports.
Page 223 Solving Other Problems You have attempted to upgrade several Switch units in a stack using TFTP, and one unit fails to upgrade. Take the following steps: 1 Ensure that the unit has: The IP address 0.0.0.0, or A valid IP address that is in the same subnet as the TFTP server 2 If the unit has the IP address 0.0.0.0, ensure that the stack has a valid IP address that is in the same subnet as the TFTP server.
Page 224 11: P HAPTER ROBLEM OLVING...
Page 225: Appendices And Index
PPENDICES AND NDEX Chapter A Serial Web Utility Chapter B Management Software Upgrade Utility...
Page 227: Introduction
Windows 95/98 and you want to access the web interface through the console port of your Switch, you must use the 3Com Serial Web Utility (SLIP driver) on the CD-ROM supplied with the Switch. You can find the utility in the \win95\drivers\slip\ directory on the CD-ROM.
Page 228 A: S PPENDIX ERIAL TILITY 4 In the Run dialog box, type (where drive :\Win95\Drivers\Slip\Setup is the letter of your CD-ROM drive) and click OK. drive The installation program starts and checks your system configuration; enter any information that is requested. If the setup program cannot find specific files on your management workstation, it asks you to insert your Windows ‘95 CD-ROM.
Page 229: Using The Serial Web Utility
Using the Serial Web Utility 6 When you have finished, the final installation dialog box is displayed informing you that the Serial Web Utility has been installed on your management workstation. Click Finish to close the dialog box. 7 You are asked if you want to restart Windows so that it can use the new settings you have configured.
Page 230 A: S PPENDIX ERIAL TILITY The connection is complete if the password panel of the Web interface is displayed. You are now ready to manage the Switch or stack; see “Working With the Web Interface” page...
Page 231: Software Upgrade Utility
ANAGEMENT OFTWARE PGRADE TILITY The CD-ROM supplied with your Switch includes a management software upgrade utility that can be used to upgrade the management software of the Switch. The utility should only be used if a previous upgrade has failed, and you are unable to communicate with the Switch using the web interface or command line interface.
Page 232 B: M PPENDIX ANAGEMENT OFTWARE PGRADE TILITY c Copy the management software file to the upgrade directory on the hard drive. d Change your directory to the upgrade directory on the hard drive. 5 At the MS-DOS prompt, enter the upgrade command: update <file>...
Page 233: Glossary
LOSSARY 10BASE-T The IEEE specification for 10Mbps Ethernet over Category 3, 4 or 5 twisted pair cable. 100BASE-FX The IEEE specification for 100Mbps Fast Ethernet over fiber-optic cable. 100BASE-TX The IEEE specification for 100Mbps Fast Ethernet over Category 5 twisted-pair cable. 1000BASE-T The IEEE specification for Gigabit Ethernet over Category 5 twisted-pair cable.
Page 234 LOSSARY bridge A device that interconnects two LANs of a different type to form a single logical network that comprises of two network segments. Bridges learn which endstations are on which network segment by examining the source addresses of packets. They then use this information to forward packets based on their destination address.
Page 235 LOSSARY filtering The process of screening a packet for certain characteristics, such as source address, destination address, or protocol. Filtering is used to determine whether traffic is to be forwarded, and can also prevent unauthorized access to a network or network devices. flow control A congestion control mechanism.
Page 236 LOSSARY IETF Internet Engineering Task Force. An organization responsible for providing engineering solutions for TCP/IP networks. In the network management area, this group is responsible for the development of the SNMP protocol. See Intelligent Flow Management. IGMP Internet Group Management Protocol. An IP-based multicast filtering system that allows endstations to register that they would like to receive traffic from certain multicast groups.
Page 237 Network Interface Card. A circuit board installed in an endstation that allows it to be connected to a network. PACE Priority Access Control Enabled. 3Com technology that allows Switch units to control the latency and jitter associated with transmitting multimedia traffic over Ethernet and Fast Ethernet.
Page 238 LOSSARY POST Power On Self Test. An internal test that a Switch carries out when it is powered-up. protocol A set of rules for communication between devices on a network. The rules dictate format, timing, sequencing and error control. repeater A simple device that regenerates LAN traffic so that the transmission distance of that signal can be extended.
Page 239 A system which allows data that has been assigned a high priority to traffic prioritization be forwarded through a switch without being obstructed by other data. ® The 3Com umbrella management system used to manage all of 3Com’s Transcend networking solutions. A packet sent to a single endstation on a network.
Page 240 LOSSARY VLAN tagging A system that allows traffic for multiple VLANs to be carried on a single link. Virtual LAN Trunk. A Switch-to-Switch link that carries traffic for all the VLANs on each Switch. Wide Area Network. A communications network that covers a wide area.
Page 241 3Com Library icon 49 autoDiscovery, enabling and disabling 108 3Com Support icon 49 autoNegotiation command (Ethernet menu) 122 3Com World Wide Web site, accessing 49 Auto-negotiation listbox (Port Setup page) 61 802.1p Multicast Learning listbox (Advanced Stack Available Analysis Ports listbox (Roving Analysis...
Page 242 NDEX Capture (RMON group) 207 default CD-ROM 34, 227, 231 passwords 39 Collisions field (Ethernet/Statistics menu) 125 settings 29 Color Key page 54 users 39 color-coding of ports, displaying 54 Default Router field (IP Setup page) 59 command area of the command line interface 97 Default VLAN 165 command line interface define command (Feature/Resilience menu) 130...
Page 243 NDEX factory defaults 29 icons Fast Forward forwarding mode 22 3Com 49 FastIP 26, 181 3Com Contacts 49 effect on the Switch Database 186 3Com Library 49 enabling 187 3Com Support 49 example 183 Configuration 50 FastIP listbox (Advanced Stack Setup page) 78...
Page 244 NDEX menus, displaying 100 modify command (Bridge/VLAN menu) 118 Jabbers field (Ethernet/Statistics menu) 125 modify command (SNMP/Trap menu) 138 modify command (System/Security/Access menu) 150 modify command (System/Security/User menu) 148 learned SDB entries 73 monitor ports, defining 87 Link State field (Port Setup page) 61 multicast filtering 27, 189 list command (Bridge/MulticastFiltering/RouterPort IEEE 802.1p 191...
Page 245 NDEX page area of the web interface 48, 50 problems making changes in 53 command line interface 216 navigating 52 Management Software Upgrade Utility 220 Pair State column (Resilient Links page) 80 Serial Web Utility 219 password command (System menu) 147 SNMP management 218 password dialog 44 web interface 214...
Page 246 NDEX roving analysis 28, 87 Spanning Tree hello timer, setting for the current displaying information via CLI 127 switch 115 enabling 88 Spanning Tree listbox (Advanced Stack Setup ports, defining 87 page) 77 removing via CLI 128 Spanning Tree maximum age parameter, setting for setting up via CLI 127 the current swtich 115 start data monitoring via CLI 128...
Page 247 NDEX subnet mask 39 unit command (System menu) 141 Subnet Mask field (IP Setup page) 58 Unit Description field (Unit Status page) 56 subnets 39 Unit Graph page 91 sub-networks. See subnets Unit icon 50 summary command (Bridge/Port menu) 113 Unit pages summary command (Bridge/VLAN menu) 119 accessing 50...
Page 248 NDEX VLANs (continued) web interface (continued) IEEE 802.1Q learning 167 Initialize page 88 modifying a VLAN name via CLI 118 IP Setup page 58 placing ports in multiple 85, 166 Location page 69 placing ports in single 85, 166 Management Settings pages, overview 51 removing port(s) via CLI 119 map 53 VLT tagging 167...

3Com SuperStack II Manual

I Getting Started with Management

1 Super Stack II Switch Management Software

2 Setting U P for Management

The Management Interfaces

3 Working with the Web Interface

4 Working with the Command Line Interface

5 Port Trunks

6 Virtual Lan S (Vlan S )

7 Fast Ip

8 Multicast Filtering

9 Spanning Tree Protocol

10 Rmon

Problem Solving

11 Problem

Appendices and Index

A Serial Web Utility

Software Upgrade Utility

Glossary

Quick Links

Related Manuals for 3Com SuperStack II

Summary of Contents for 3Com SuperStack II