3Com MSH 1005 User Manual
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3Com MSH 1005 User Manual

3Com MSH 1005 User Manual

3com switch user guide
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Part No. DUA1840-0AAA01
Published June 1996
MSH S
WITCH
U
G
SER
UIDE
1005

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Summary of Contents for 3Com MSH 1005

  • Page 1 MSH S ® Part No. DUA1840-0AAA01 Published June 1996 WITCH UIDE 1005...
  • Page 2 Santa Clara, California 95052-8145 © 3Com Ireland, 1996. 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.

  • Page 3: Table Of Contents

    Internal Switch Ports 1-3 Transceiver Module Ports 1-4 The Backbone Port 1-4 Adding an Expansion Module 1-4 Switch Operation and Features 1-5 How the Switch Compares to a Bridge 1-5 Forwarding of Packets 1-5 Intelligent Flow Management 1-7 Full Duplex 1-8 Security 1-8...
  • Page 4 Links LK 1 to LK 5 [3] 1-20 Expansion Module Socket [4] 1-20 Backplane Connectors [5] 1-20 Switch Defaults 1-20 Setting Up the MSH Switch 1005 for Management 1-21 NSTALLATION AND Safety Information 2-1 Pre-installation Configuration 2-2 Setting the Links on the Switch 1005 2-2...
  • Page 5 Deleting a User 2-22 Editing User Details 2-23 Assigning Local Security 2-24 WITCH ONFIGURATION Choosing a Switch Management Level 3-1 Switch 1005 Setup 3-4 Port Setup 3-7 Specifying the Backbone Port 3-11 The Switch Database (SDB) 3-12 Configuring the Switch Database 3-14...
  • Page 6 VLAN Configurations 4-6 Example 1 4-6 Example 2 4-8 Example 3 4-10 Setting Up VLANs on the Switch 4-12 Assigning a Port to a VLAN 4-15 Specifying a Backbone Port 4-15 Specifying that a Backbone Port is Part of a VLT 4-15...
  • Page 7 CCESS ECHNICAL PECIFICATION ECHNICAL UPPORT Online Technical Services C-1 3Com Bulletin Board Service C-1 Access by Modem C-1 Access by ISDN C-2 World Wide Web Site C-2 3ComForum on CompuServe C-3 3ComFacts Automated Fax Service C-3 Support from Your Network Supplier C-4...

  • Page 9: How To Use This Guide

    The following table shows where to find specific information in this guide. If you are looking for: A description of all the Switch 1005 features and a guide to making a quick start with management Important safety information, a brief overview of the installation process...
  • Page 10 BOUT UIDE Conventions Table 1 throughout this guide: Table 1 Notice Icons Icon Table 2 Text Conventions Convention “Enter” vs. “Type” Text represented as screen display Text represented as commands Keys Italics Table 2 list text and icon conventions that are used Type Description Information Note...

  • Page 11: Related Publications

    Related Publications Related Publications This User Guide is not intended to answer all your questions concerning the MSH. While using the MSH Switch 1005, you may need to refer to the following publications: LinkBuilder MSH User Guide, part number DUA1800-0AAA0x.
  • Page 12 BOUT UIDE...

  • Page 13: About The Linkbuilder Msh

    LANs and LAN segments connected to the MSH. About the MSH Switch 1005 The MSH Switch 1005 is designed to be installed into the MSH chassis, so that you can extend your network beyond the limits of a repeater and provide your users with greater bandwidth, faster throughput, and high speed connections.

  • Page 14: Summary Of Features

    Full duplex on Fast Ethernet Transceiver Modules Security Resilient Links Port-based Virtual LANs (VLANs) Support for up to 16 VLANs on a single Switch 1005 Eases the movement of devices on IP networks Controls traffic Provides extra security PACE (Priority Access Control Enabled)

  • Page 15: Internal Switch Ports

    (328ft) over grade 3, 4 or 5 twisted pair cable. Internal Switch Ports As well as switch ports located on the front panel of the Switch 1005, internal backplane connections provide an additional four switch ports. These ports are enabled and disabled through management or using the set of links LK1 to LK5 located on the Switch 1005.

  • Page 16: Adding An Expansion Module

    HAPTER ETTING TARTED Transceiver Module Ports A slot on the front of the Switch 1005 allows you to install any of the Transceiver Modules available for this product. You can find more details in “Transceiver Module slot” on page 1-18.

  • Page 17: How The Switch Compares To A Bridge

    Switch Operation and Features How the Switch Compares to a Bridge The table below shows how Switch 1005 operation compares to that of an IEEE 802.1D bridge: Address Learning Forwarding Mode Operation when packet buffers full Spanning Tree Action on Unknown...
  • Page 18 64µs and 1.2ms, depending on frame length. In Store and Forward mode, latency is measured as the time between receiving the last bit of the frame, and transmitting the first bit. For the Switch 1005, this is 8µs.

  • Page 19: Intelligent Flow Management

    If a packet arrives at a conventional switch that does not operate IFM, and that port is congested, the transmitting device is unaware of this until it times out and decides that the receiving station is not going to respond to the message.

  • Page 20: Resilient Links

    Switch 1005. Virtual LANs (VLANs) The Switch 1005 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.

  • Page 21: Pace

    Ethernet bandwidth. However, when two-way traffic is passing between an end-station and the switch port, access to the bandwidth can still be unfairly allocated to traffic in one direction, resulting in poor quality video display. PACE allocates the available bandwidth fairly to traffic in each direction.
  • Page 22 1-10 1: G HAPTER ETTING TARTED You can enable PACE on the whole Switch 1005 module or on an individual port. Before configuring PACE, you should refer to sections “Switch 1005 Setup” “Port Setup” in Chapter 3. DUA1840-0AAA01...

  • Page 23: Msh Switch 1005 On Your Network

    Ideally ..any local server should be connected to the Switch 1005 using a 100Mbps port. If that is not possible ..connect the local server to a dedicated 10Mbps port.
  • Page 24 ETTING TARTED Figure 1-1 Workgroup Switch I Figure 1-1 shows how the Switch 1005 fits into a large corporate network with a Fast Ethernet infrastructure. A Switch is positioned on each floor and servers are centralized in the basement. DUA1840-0AAA01...
  • Page 25 Figure 1-2 Workgroup Switch II Figure 1-2 shows the Switch 1005 in a second workgroup situation. This setup could be that of a small office within a large corporation, or part of a larger corporate network. Each switch port has mainly muliple end-stations. DUA1840-0AAA01...
  • Page 26 Switch 1005 used for a group of heavy-traffic users in a large corporate network. Here, switching is brought to the desktop with a single end-station per switch port. Local servers are connected via a 100Mbps Fast Ethernet link.

  • Page 27: Configuration Rules For Fast Ethernet

    10Mbps Ethernet. The key topology rules are: Maximum UTP cable length is 100m (328ft) over category 5 cable. A 412m (1352ft) fiber run is allowed for connecting switch to switch, or end-station to switch, using standards-compliant half-duplex 100BASE-FX.

  • Page 28: Switch Overview — Front Panel

    1-16 1: G HAPTER ETTING TARTED Switch Overview — Front Panel Figure 1-4 Switch 1005 front view DUA1840-0AAA01...

  • Page 29: Leds

    “Identifying Fault Conditions with the LEDs” DUA1840-0AAA01 Switch Overview — Front Panel Color Indicates ... Green The Switch is powered up and operating normally. Green flash Power On Self Test (POST) in operation. (slow, 0.5 Hz) Green flash Software download in progress...

  • Page 30: Transceiver Module Slot

    4 Port 10BASE-T Transceiver Module (3C18409) — Adds an additional four 10BASE-T ports to your Switch 1005 with the same operating conditions as the eight fixed ports described below. You should contact your supplier for further details on these and any further Transceiver Modules available from 3Com.

  • Page 31: Switch Overview — Pcb View

    Switch Overview — PCB View Figure 1-5 Switch 1005 PCB view Transceiver Module Connector [1] 2x20 pin connector for any of the Transceiver Modules listed in “Transceiver Module slot” Modules is described in the documentation that accompanies them. DUA1840-0AAA01 Switch Overview — PCB View on page 1-18.

  • Page 32: Expansion Module Fixing Posts [2]

    Switch. Backplane Connectors [5] These connectors engage with the backplane located in the MSH chassis. Switch Defaults The following table shows factory defaults for the MSH Switch 1005: Port Status Forwarding Mode Intelligent Flow Management...

  • Page 33: Setting Up The Msh Switch 1005 For Management

    Switch 1005 without any further configuration. If you are using the IPX protocol, the Switch 1005 will be allocated an IPX address automatically. You can start the SNMP Network Manager and begin managing the Switch 1005.
  • Page 34 For further information on the Management Setup screen, see 1005 Management Setup” 8 If you need the Switch to send SNMP traps to the network manager, you may need to setup the address of the network manager in the Trap Table.

  • Page 35: Safety Information

    Before installing the MSH Switch 1005 into your MSH chassis, you should consider the following safety information: Installation and removal of the Switch 1005 should be carried out by qualified personnel only. The Switch 1005 operates under SELV conditions (Safety Extra Low Voltage) according to IEC 950, the conditions of which are met only if the equipment to which it is connected is also operational under SELV.

  • Page 36: Setting The Links On The Switch 1005

    Fitting an Expansion Module if required. Setting the Links on the Switch 1005 Five links located on the Switch 1005 allow you to set up its backplane connections. The links are located on the Switch 1005 PCB as shown in...
  • Page 37 In a managed MSH chassis, these links will be overridden by any changes made through management software. This is the case, even if the chassis is reset or powered off/on, or if the Switch 1005 module is replaced with another one.

  • Page 38: Advice For Setting Backplane Connections And Avoiding Loops

    Advice for Setting Backplane Connections and Avoiding Loops Considerable care should be taken when setting backplane connections if there is more than one Switch 1005 installed in your MSH chassis. If more than one module has multiple connections enabled on the same VLAN, a network loop can occur, severely affecting network operation.

  • Page 39: Fitting A Transceiver Module

    Fitting an Expansion Module Fitting an Expansion Module allows you to increase the number of ports for your Switch 1005; you should fit it to the Switch 1005 before installing the pair into the MSH chassis. The Expansion Module provides three locations for Transceiver Modules.

  • Page 40: Switch 1005 Installation And Removal

    3 Undo the screws from the blanking plate of the slot of your choice. Keep the blanking plate in a safe place. If you remove the Switch 1005, you must cover any open slot with a blanking plate to maintain the circulation of cooling air and prevent the entry of dust and debris into the MSH.

  • Page 41: Removing The Switch 1005

    Operation after Power-up In an Unmanaged System The links LK1 to LK5 are used to set the Switch’s backplane connections in an unmanaged MSH chassis. These settings are used when the MSH chassis containing the Switch is first powered-up. Subsequent changes made to the settings directly through the Switch’s onboard...

  • Page 42: In A Managed System

    NITIAL ETUP In a Managed System In a managed MSH chassis, operation of the Switch 1005 is the same, but the Management Module may itself override the link settings. This will occur if: The Management Module has a stored configuration for a Switch 1005...

  • Page 43: Setting Up The Switch 1005

    Access the VT100 interface over a TCP/IP network using a workstation running VT100 terminal emulation and Telnet. Use an SNMP Network Manager (such as 3Com’s Transcend Enterprise Manager) over a network running either the IP or IPX protocol. Each Network Manager provides its own user interface to the management facilities.
  • Page 44 2-10 2: I HAPTER NSTALLATION AND Table 2-2 VT100 screen components Type of information Choice Field Entry Field Button List Box NITIAL ETUP Shown on screen as... Description *text* Text enclosed with markers is a list from which you can select one option only. Press [Space] to cycle through the options.
  • Page 45 Check carefully in the manual accompanying your Telnet or terminal emulation software before using the Control keys. DUA1840-0AAA01 Setting up the Switch 1005 To do this... move from one field to the next, on any screen without mak- ing any changes.

  • Page 46: Using An Snmp Network Manager

    Management Information Base (MIB) is correctly installed at your network management station. 3Com provides the Transcend range of SNMP Network Managers, the use of which is not described in this User Guide; refer to the User Guides that accompany the software. To manage the Switch 1005 with a Network Manager from another vendor, you will need to ensure you have the correct MIB.

  • Page 47: Accessing The Switch 1005 Vt100 Interface

    Accessing the Switch 1005 VT100 Interface The following sections explain how to access the VT100 management screens for the Switch 1005. You may find it useful to refer to when locating the screens you require. Figure 2-2 VT100 screen map...

  • Page 48: Logging On

    DUA1850-0AAA0x. 2 When you have successfully logged on to the MSH, you will see the 3Com LinkBuilder Main Menu. From the list of options, select SERVICE SELECTION. 3 From the list of services available for this MSH, select Switch 1005; the LinkBuilder MSH Address Table appears.

  • Page 49: After Logging On

    Table 2-4 Default Users User Name monitor manager security After Logging On When you have successfully logged on to the Switch 1005, the Main Menu appears as shown in Figure 2-4 Switch 1005 Main Menu DUA1840-0AAA01 Accessing the Switch 1005 VT100 Interface Default...
  • Page 50 From here, you can select the options needed to manage the module. Access to options depends on the access level you have been assigned. Access rights to the VT100 screens for the Switch 1005 are listed in Appendix If you are a user with security access level, and are using the...

  • Page 51: Switch 1005 Management Setup

    Power On Self Test (POST) Type Normal/Extended Use this field to determine the type of self-test that the Switch 1005 carries out when it is powered up. If this field is set to Normal, a basic confidence check lasting approximately 10 seconds is carried out. If this field is set to Extended, a full set of tests are carried out which may take up to 90 seconds to complete.
  • Page 52 Default Router If a default router exists on your network, type in the IP address here. You can change the Device Router IP address using this field; for the change to take effect, you must reset the Switch 1005. BOOTP Select Enabled/Disabled If BOOTP is enabled and you have a BOOTP server on your network, an IP address will be automatically mapped to the Switch when it is first powered up.

  • Page 53: Logging Off

    If you make a mistake entering your password, you will be returned to the Logon screen. DUA1840-0AAA01 Accessing the Switch 1005 VT100 Interface “Setting Up Traps” 2-19 in Chapter 3.
  • Page 54 2-20 2: I HAPTER NSTALLATION AND NITIAL ETUP If you connected to the Switch 1005 via the MSH Management Module screens, the LinkBuilder MSH Address Table screen is displayed once you have entered the correct password. DUA1840-0AAA01...

  • Page 55: Setting Up Users

    CREATE USER screen — In addition to the default users set up on the Switch 1005, you can add up to ten new users. DELETE USERS screen — Lets you delete users from the Switch 1005. The default users cannot be deleted.

  • Page 56: Creating A New User

    Access Level Assign an access level for this new user, as follows: monitor — access to view, but not change a subset of the manageable parameters of the Switch 1005 secure monitor — as monitor NITIAL ETUP 2-8.

  • Page 57: Deleting A User

    — access to all the manageable parameters of the Switch 1005, except security features specialist — as manager security — access to all manageable parameters of the Switch 1005 Community String By default a community string identical to the user name is generated.

  • Page 58: Editing User Details

    Confirm Password Retype the new password into this field. Community String Type a new community string into this field. If you forget your password while logged out of the Switch 1005 VT100 interface, contact your local technical support representative who will advise on your next course of action.

  • Page 59: Assigning Local Security

    These steps assume the User Access Levels screen is displayed. 1 Select the LOCAL SECURITY option. The Local Security screen appears as shown in Figure 2-11 Switch Local Security screen 2 Fill in the fields as required. 3 When you have filled in the form, select OK.
  • Page 60 NSTALLATION AND NITIAL ETUP Community SNMP Enabled/Disabled The Switch 1005 can be managed via SNMP using a remote network manager. Community SNMP does have some simple security features, but it is an insecure protocol. You may want to disable all access to the management facilities if there is important or sensitive data on your network.
  • Page 61 Setting Up Users 2-27 DUA1840-0AAA01...

  • Page 62: Choosing A Switch Management Level

    ONFIGURATION Choosing a Switch Management Level The Switch Management screen lets you: Choose between managing a port, the Switch module or a VLAN. Display screens showing statistical information. Display the Switch Database configuration screen. Display the Switch Unit Resilience Summary screen.
  • Page 63 Figure 3-2 all options at the foot of the screen relate to the Switch 1005. If you choose Port, the screen that appears is similar to that shown in Figure 3-1 and all options relate to an individual port.
  • Page 64 Port ID 1 ... 28 When managing a Switch 1005 port, type the port number into this field before selecting the next screen: Ports 1 to 4 represent ports on any Transceiver Module you may have installed Ports 5 to 12 are the eight fixed 10BASE-T port...

  • Page 65: Switch 1005 Setup

    3: S HAPTER WITCH Switch 1005 Setup With the Switch Management screen displayed, choose to setup the module, then select the SETUP button. The Switch Module Setup screen is displayed as shown in Figure 3-4 Module Setup screen The screen shows the following: Module Type A read-only field showing the type of device.
  • Page 66 8µs. Intelligent — In this mode, the Switch 1005 monitors the amount of error traffic on the network and changes the forwarding mode accordingly.
  • Page 67 277 hours with a default of 30 minutes. If you enter 00:00, the database entries are non-ageing; non-ageing entries do not age but will be deleted from the database if the Switch 1005 is reset or a power-off/on cycle occurs.

  • Page 68: Port Setup

    Port Setup With the Switch Management screen displayed, choose to setup the port, then select the SETUP button. The Switch Port Setup screen is displayed as shown in Figure 3-5 Port Setup screen The screen shows the following: Port ID This read-only field shows the ID of the port you have chosen to setup.
  • Page 69 WITCH ONFIGURATION Lost Links The number of times the link has been lost since the Switch 1005 was last reset. If this field displays a number other than 0, you should check your cables and replace any that may be damaged.
  • Page 70 Enable — Enabling PACE increases network performance particularly if you are using multimedia applications. You should only enable PACE on a port if it is connected to a single end-station, switch, bridge or router. Setting this field overrides the PACE configuration specified for the port using the Module Setup screen, see 1005 Setup”...
  • Page 71 3: S HAPTER WITCH Broadcast Storm Control The Switch 1005 automatically creates an alarm on each of its ports to monitor the level of broadcast traffic on each port. The Broadcast Storm Control fields allow you to specify thresholds for the level of broadcast traffic on a port. In addition, you can specify an action to take place if the threshold is exceeded.

  • Page 72: Specifying The Backbone Port

    You should be aware of the following points when using Broadcast Storm Control: The Switch takes 5-7 seconds to recognize that a broadcast storm is occurring. Broadcast Storm Control calculates the average broadcast bandwidth over the previous 20 second interval. The average is based on 4 samples which are taken at 5 second intervals.

  • Page 73: The Switch Database (Sdb)

    If you have set up Traps for the Switch 1005, notification that the database is becoming full is provided by two traps: Database is 90% full...
  • Page 74 3-4. Permanent entries — Permanent entries are retained in the database if the Switch 1005 is reset or a power off/on cycle occurs. It is up to the system administrator to make entries permanent. You can do this with single addresses or all addresses in the database using an SNMP Network Manager.

  • Page 75: Configuring The Switch Database

    The Switch Module Database View screen, shown in Figure 3-6, allows you to display and configure the contents of the Switch 1005 database. Figure 3-6 Switch Module Database View screen To access the screen, make sure the Switch Management screen is displayed, see “Choosing a Switch Management Level”...

  • Page 76: Searching The Switch Database

    INSERT This button lets you insert an entry into the database. DELETE This button allows you to delete entries from the database. Searching the Switch Database You can search the switch database in two ways; by MAC address or port number. By MAC Address...

  • Page 77: Deleting An Entry From The Sdb

    3-16 3: S HAPTER WITCH 2 In the Port Number field, enter the port ID for which you want MAC addresses displayed. 3 Select FIND. The listbox will show entries in the database for that port only. Adding an Entry into the SDB 1 In the MAC Address field, type in the MAC address of the device.

  • Page 78: Resilient Links

    When setting up resilient links, you should note the following: Up to 12 resilient link pairs can be configured on the Switch 1005. The main and standby ports must be set up on the same Switch 1005 or module pair (main module with fitted expansion module).

  • Page 79: Viewing Resilient Setup

    3: S HAPTER WITCH Viewing Resilient Setup With the Switch Management screen displayed, choose to set up the module and select the RESILIENCE button. The Switch Module Resilience Summary screen is displayed as shown in Figure 3-7. This screen shows the current resilient link configuration for the module.
  • Page 80 Standby — The main port has failed and the standby port is carrying the traffic. You should rectify the fault and switch operation back to the main link as soon as possible. Swapping the main and standby ports is not carried out automatically. Use the Port Resilience screen described in the next section to swap the main and standby ports.

  • Page 81: Configuring Resilient Links

    HAPTER WITCH Configuring Resilient Links With the Switch Management screen displayed, choose the port that will be set up as the main port in the resilient link pair, then select the RESILIENCE button. The Port Resilience screen is displayed as shown in screen allows you to setup, edit and delete resilient link pairs.
  • Page 82 Active Port Main/Standby If your main link fails and the standby link takes over the traffic, the link will not automatically switch back when the main link is reinstated. Use this field to manually switch traffic back to the main link.

  • Page 83: Creating A Resilient Link

    2 Ensure both ports have an identical port security mode configuration and that they are members of the same VLAN. 3 At the Switch Management screen, select the port to be configured as the main port in the link. Select the RESILIENCE button at the foot of the screen.

  • Page 84: 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 1005. Your Network Manager may automatically set up traps in the Switch 1005 Trap Table. Check the documentation accompanying the network management software.
  • Page 85 The default community string is public. Throttle To prevent a remote Network Manager receiving too many traps at once, you can configure the Switch 1005 to transmit traps with a delay between them. If several traps are generated at one time, they will be transmitted with the specified delay between them.

  • Page 86: Resetting The Switch 1005

    Resetting the Switch 1005 If you suspect a problem with the Switch 1005, you can perform a reset. 1 From the Switch Main Menu, select the RESET option. The Reset screen appears as shown in 2 Select OK. Figure 3-10 Reset screen CAUTION: Resetting the Switch 1005 in this way is similar to performing a power off/on cycle.

  • Page 87: Initializing The Switch 1005

    When initializing the Switch, take particular note of the following: Network loops will occur if you have set up resilient links. Before initializing the Switch, ensure you have disconnected the cabling for all your standby links. ONFIGURATION Figure 3-11.
  • Page 88 Avoiding Loops” Ports which form part of a VLT will fail and you will not be able to manage the Switch if your management station communicates via the VLT. To avoid this: a Remove the VLT configuration from both ends of the VLT link before you initialize the Switch.

  • Page 89: Upgrading Software

    HAPTER WITCH Upgrading Software When 3Com issues a new version of the software image for the Switch 1005, you can obtain it from the 3Com Bulletin Board Service, see Appendix You use the Software Upgrade screen to download new software images.
  • Page 90 3 In the Server Address field, type the IP or IPX address of the host containing the software image to load. 4 Select OK. During the download, the MGMT LED flashes green (fast flash, 1Hz) and the screen is locked. When the download is complete, the module is reset.
  • Page 91 3-30 3: S HAPTER WITCH ONFIGURATION DUA1840-0AAA01...

  • Page 92: Virtual Lans (Vlans)

    DVANCED Virtual LANs (VLANs) Setting up Virtual Local Area Networks (VLANs) on the MSH Switch 1005 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 1005.

  • Page 93: Benefits Of Vlans

    4: A HAPTER DVANCED ANAGEMENT Benefits of VLANs Implementing VLANs on your network has three main advantages: It eases the change and movement of devices on IP networks 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 workstation must be updated manually.

  • Page 94: An Example

    VLAN 1 is restricted to ports 1, 2, 3, 4 and 5 of Switch A; membership of VLAN 2 is restricted to ports 4, 5, 6, 7 and 8 of Switch B while VLAN 3 spans both Switches containing ports 6, 7, 8 of Switch A and 1, 2, 3 of Switch B.

  • Page 95: Connecting Vlans To A Router

    VLANs and the Switch 1005 The Switch 1005 supports port-based VLANs, where a VLAN consists 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.

  • Page 96: Connecting Common Vlans Between Switches

    LAN Trunk (VLT). A VLT is a connection which carries traffic for multiple VLANs between Switch modules and units. If you configure both ends of a Switch-to-Switch connection as part of a VLT, you only need that one connection for all the VLANs.

  • Page 97: Vlan Configurations

    3 Use the VT100 screens to specify that the VLAN 1 port connected to the router is a backbone port. 4 Repeat steps 2 and 3 for VLAN 2. You can set up this configuration more easily using 3Com’s Transcend Enterprise Manager applications. ANAGEMENT...
  • Page 98 Virtual LANs (VLANs) Figure 4-2 VLAN configuration with a single Switch 1005 module DUA1840-0AAA01...

  • Page 99: Example 2

    Place port 1 of the right Switch 1005 in VLAN 2. b Place port 1 of the left Switch 1005 in VLAN 1. 5 Connect port 28 on the right Switch 1005 to port 28 in the left Switch 1005.
  • Page 100 Virtual LANs (VLANs) You can set up this configuration more easily using 3Com’s Transcend Enterprise Manager applications. Figure 4-3 VLAN configuration with two Switch 1005s DUA1840-0AAA01...

  • Page 101: Example 3

    Place ports 5-8 of all the Switch 1005s in VLAN 1. b Place ports 9-12 of all the Switch 1005s in VLAN 2. 2 Connect port 1 on each Switch 1005 to a port in the Switch 3000 FX. 3 Use the VT100 screens to: a Specify that port 1 on each Switch 1005 is a backbone port.
  • Page 102 Virtual LANs (VLANs) 4-11 You can set up this configuration more easily using 3Com’s Transcend Enterprise Manager applications. Figure 4-4 VLAN configuration with a Switch 3000 FX as a basement switch DUA1840-0AAA01...

  • Page 103: Setting Up Vlans On The Switch

    The VLAN Setup screen allows you to set up and manage VLANs on the Switch. To access the VLAN Setup screen: 1 From the VT100 Main Menu, select SWITCH MANAGEMENT. The Switch Management screen appears. 2 In the Management Level field, choose VLAN.
  • Page 104 If the Switch 1005 has a Fast Ethernet Transceiver Module installed, this automatically becomes the backbone port for the Default VLAN when you initialize the Switch. If the Switch has more than one Fast Ethernet Transceiver Module, the Transceiver Module with the lowest port number automatically becomes the backbone port for the Default VLAN.
  • Page 105 4-14 4: A HAPTER DVANCED ANAGEMENT ResBP This field displays the resilient backbone port for the VLAN, if one exists. For more information about creating resilient links, see “Resilient Links” on page 3-17. APPLY This button applies any changes to the VLAN database. DUA1840-0AAA01...

  • Page 106: Specifying That A Backbone Port Is Part Of A Vlt

    2 In the VLAN ID field, type the ID of the required VLAN. 3 Select APPLY. CAUTION: Initially, all Switch ports belong to the Default VLAN (VLAN 1). This VLAN is the only VLAN which allows an SNMP Network Manager to access the management agent of the unit.
  • Page 107 4-16 4: A HAPTER DVANCED ANAGEMENT DUA1840-0AAA01...

  • Page 108: Status Monitoring And Statistics

    TATISTICS This chapter describes how to view the current operating status of the Switch 1005 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 1005, and advises you on actions to take if you see unexpected values for the statistics.

  • Page 109: Summary Statistics

    ONITORING AND TATISTICS Summary Statistics With the Switch Management screen displayed, choose to view statistics for the Switch 1005 module, then select the STATISTICS button. A typical Switch Summary Statistics screen is displayed as shown in Figure 5-1. Figure 5-1 Switch Summary Statistics screen The screen lists values for the current counter against every port on the Switch 1005 and it is refreshed approximately every two seconds.
  • Page 110 Use this button for 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. To zero actual device counters, you need to reset the Switch 1005, refer to “Resetting the Switch 1005” Chapter 3.

  • Page 111: Port Statistics

    ONITORING AND TATISTICS Port Statistics With the Switch Management screen displayed, choose to view statistics for a Switch 1005 port, then select the STATISTICS button. A typical Switch Port Statistics screen is displayed as shown in Figure 5-2. Figure 5-2 Switch Port Statistics screen As well as showing statistics for the port, this screen allows you access to traffic and error counter screens.
  • Page 112 Port Statistics Frames Forwarded This counter provides a running average of the proportion of the received frames that are forwarded and is expressed as a percentage of all received frames. A sampling period of 1 minute is used. Broadcast Frame Bandwidth This counter provides a running average of the Broadcast frame bandwidth in use and is expressed as a percentage of a theoretical maximum bandwidth.

  • Page 113: Port Traffic Statistics

    5: S HAPTER TATUS ONITORING AND TATISTICS Port Traffic Statistics With the Port Statistics screen displayed, select the TRAFFIC STATISTICS button. A typical Port Traffic Statistics screen is displayed as shown in Figure 5-3. Figure 5-3 Port Traffic Statistics screen The screen shows the following: Port ID The ID of the port you are currently managing.
  • Page 114 Multicasts Received The number of frames successfully received that have a multicast destination address. This does not include frames directed to a broadcast address or frames received with errors. Broadcasts Received The number of frames received that have a broadcast destination address. This does not include frames with errors. Collisions An estimate of the total number of collisions that occurred when transmitting from the unit.
  • Page 115 5: S HAPTER TATUS IFM Count The total number of times Intelligent Flow Management (IFM) has had to operate to minimize packet loss. Frame Size Analysis The number of frames of a specified length as a percentage of the total number of frames of between 64 and 1518 octets.

  • Page 116: Port Error Analysis

    Port Error Analysis With the Port Statistics screen displayed, select the ERROR ANALYSIS button. A typical Port Error Analysis screen is displayed as shown in Figure 5-4 Port Error Analysis screen The 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 an CRC error or an alignment error.
  • Page 117 5-10 5: S HAPTER TATUS ONITORING AND TATISTICS Short Events This counter is incremented by one for each carrier event whose duration is less than the short event maximum time. Short events are error frames smaller than the minimum size defined for 802.3 frames.

  • Page 118: Status Monitoring

    System Up Time (seconds) The number of seconds this unit has been running since the last reset or power off/on cycle. Number Of Resets The total number of system resets since the Switch 1005 was first installed or initialized; either power-on, manual reset or a watchdog expiry.
  • Page 119 Boot Software Version This is the version number of the Boot software stored on the Switch 1005. You should note this number in case you need to quote it to your technical support representative. DUA1840-0AAA01...

  • Page 120: Remote Polling

    When the poll is complete, the Round Trip Time field shows the interval in milliseconds between sending the frame to the target device and receiving a response at the Switch 1005. If the target device does not respond after approximately 10 seconds, this field will display no reply.
  • Page 121 5-14 5: S HAPTER TATUS ONITORING AND TATISTICS DUA1840-0AAA01...

  • Page 122: Spot Checks

    ROBLEM OLVING Spot Checks This chapter explains how to check for problems and solve them. It is good practice to carry out regular checks of your MSH equipment and it could allow you spot a potential problem before it occurs. Check the following: LEDs —...

  • Page 123: Identifying Fault Conditions With The Leds

    6: P HAPTER ROBLEM Identifying Fault Conditions with the LEDs The following table shows how you can identify possible fault conditions that may occur during normal operation. It also describes actions that may resolve the problem: Color Indicates Power is not reaching the module (Power) Faulty LED Amber...

  • Page 124: Vt100 Problems

    Check that the port though which you are trying to access the device is still in VLAN 1 (the Default VLAN). See on the Switch” Try accessing the device through a different port. If you can now access the device, a problem with the original port is indicated.

  • Page 125: Switch 1005 Operation Problems

    You are using PACE equipped devices and have PACE enabled at both ends of the link. PACE must only be enabled at one end of the Switch-device link. Disable PACE on the Switch port as described in “Port Setup” Changing links LK1 to LK5 has no effect on external port configuration.
  • Page 126 You have added the Switch 1005 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 1005 ports via a repeater or switch, and not turned off IFM. Turn off IFM on any port that is connected to multiple devices.
  • Page 127 6: P HAPTER ROBLEM OLVING DUA1840-0AAA01...

  • Page 128: Access Rights

    CREEN The following table lists the rights assigned to each level of user for accessing and editing Switch 1005 screens via the VT100 interface. The access rights granted to Monitor level are all read-only. All other access rights are read-and-write.

  • Page 129: Appendix A: Screen Access Rights

    A: S PPENDIX CREEN Screen Unit Statistics Switch Database View Unit Setup Port Setup Unit Resilience Port Resilience Remote Poll Security Menu Create User Delete User Local Security Change User CCESS IGHTS Available to... Monitor Manager Security Monitor Manager Security...
  • Page 130 Screen Status Setup Trap Setup Software Upgrade Initialize Reset DUA1840-0AAA01 Available to... Monitor Manager Security Monitor Manager Security Monitor Manager Security Security Security Manager Security...
  • Page 131 A: S PPENDIX CREEN CCESS IGHTS DUA1840-0AAA01...

  • Page 132: Specification

    ECHNICAL Physical Dimensions Environmental Requirements Operating Temperature Operating Humidity Standards Safety Agency Certifications Electromagnetic Emissions (Agency Certification) Heat Dissipation PECIFICATION Height: 283mm (11.1 inches) x Width: 25mm (1 inch) x Depth 312mm (12.3 inches) Weight: 560g (1.2lbs) 0° to 50° C (32° to 122°F) 10 to 95% relative humidity, non-condensing EN60068 (IEC68) UL 1950, EN60950, CSA 22.2 No.
  • Page 133 B: T PPENDIX ECHNICAL Standards Supported PECIFICATION SNMP SNMP protocol (RFC 1157) MIB-II (RFC 1213) Bridge MIB (RFC 1286) Repeater MIB (RFC 1516) VLAN MIB (RFC 1573) RMON MIB (RFC 1271) BOOTP (RFC 951) Terminal Emulation Telnet (RFC 854) Protocols Used for Administration UDP (RFC 768) IP (RFC 791)

  • Page 134: Online Technical Services

    3Com provides easy access to technical support information through the variety of services described in this appendix. Online Technical Services 3Com offers worldwide product support seven days a week, 24 hours a day, through the following online systems: 3Com Bulletin Board Service (3ComBBS) World Wide Web site 3ComForum on CompuServe®...

  • Page 135: World Wide Web Site

    56 Kbps. To access 3ComBBS using ISDN, dial the following number: (408) 654 2703 World Wide Web Site Access the latest networking information on 3Com’s World Wide Web site by entering our URL into your Internet browser: http://www.3Com.com/ This service features news and information about 3Com products, customer service and support, 3Com’s latest news releases, selected...

  • Page 136: Comfacts Automated Fax Service

    3ComForum on CompuServe 3ComForum is a CompuServe-based service containing patches, software, drivers, and technical articles about all 3Com products, as well as a messaging section for peer support. To use 3ComForum, you need a CompuServe account. To use 3ComForum: 1 Log on to CompuServe.

  • Page 137: 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.

  • Page 138: Support From 3Com

    If you are unable to receive support from your network supplier, technical support contracts are available from 3Com. In the U.S. and Canada, call (800) 876-3266 for customer service. If you are outside the U.S. and Canada, contact your local 3Com sales office to find your authorized service provider: Country...

  • Page 139: Returning Products For Repair

    ECHNICAL Returning Products for Repair A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization (RMA) number. A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’s expense.
  • Page 140 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. backbone The part of a network used as the primary path for transporting traffic between network segments.
  • Page 141 The point of aggregation within a corporate network where a switch provides high-performance access to server farms, a high-speed backbone connection and a control point for network management and security.
  • Page 142 Intelligent Flow Management. A means of holding packets back at the transmit port of the connected end-station. Prevents packet loss at a congested switch port. Internetwork Packet Exchange. A protocol allowing communication in a NetWare network. IP address Internet Protocol address.
  • Page 143 PACE Priority Access Control Enabled. 3Com’s innovative technology which works in conjunction with a switch to control the latency and jitter associated with the transmission of multimedia traffic over Ethernet and Fast Ethernet.
  • Page 144 A device which filters, forwards and floods frames based on the frame’s destination address. The switch learns the addresses associated with each switch port and builds tables based on this information to be used for the switching decision. TCP/IP...
  • Page 145 Switch’s local management capabilities. Transcend 3Com’s network management system used to manage all of 3Com’s networking solutions. 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.
  • Page 146 NDEX Numerics 100BASE-FX Transceiver Module 1-18 100BASE-TX Transceiver Module 1-18 10BASE-T Transceiver Module 1-18 3Com Bulletin Board Service (3ComBBS) C-1 3Com sales offices C-5 3Com World Wide Web site C-2 3ComFacts C-3 3ComForum C-3 4 Port 10BASE-T Transceiver Module 1-18...
  • Page 147 1-5 full duplex definition 1-8 enabling/disabling 3-9 hardware version number 5-12 IFM. See Intelligent Flow Management Initialization screen 3-26 initializing the Switch 3-26 installing Expansion Module 2-5 Switch 1005 2-6 Transceiver Modules 2-5 Intelligent Flow Management default state 1-20...
  • Page 148 Module Resilience Summary screen 3-18 Module Setup screen 3-4 monitor username 2-15 MSH 1-1 MSH Switch 1005. See Switch 1005 network supplier support C-4 non-ageing entries 3-13 Non-routable protocols 4-5 normal POST 2-17 on-line technical services C-1 PACE default state 1-20...
  • Page 149 3-12 configuring 3-14 deleting an entry 3-16 non-ageing entries 3-13 permanent entries 3-13 searching 3-15 traps 3-12 Switch Management screen 3-1 sysName 3-4 system specifications C-1 System Up Time 5-11 technical support C-1 telnet maximum number of sessions 2-9...
  • Page 150 traps community strings 3-24 setting up 3-23 throttle 3-24 trouble-shooting 6-1 upgradeable software version number 5-12 upgrading software 3-28 User Access Levels screen 2-20 users access levels 2-20, 2-24 changing names 2-23 creating 2-21 default 2-15 deleting 2-22 editing 2-23 names 2-21 setting up 2-20 version number...
  • Page 151 HAPTER NDEX...
  • Page 152 LIMITED WARRANTY HARDWARE: 3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller: Internetworking products...
  • Page 153 3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD.
  • Page 154 ELECTROMAGNETIC COMPATIBILITY STATEMENTS FCC Statement This equipment has been tested with a class A computing device and has been found to comply with part 15 of FCC Rules. Operation in a residential area may cause unacceptable interference to radio and TV receptions requiring the operator to take whatever steps are necessary to correct the interference.

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