Lantronix LSB4 Installation Manual
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Lantronix LSB4 Installation Manual

Lantronix LSB4 Installation Manual

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The information in this guide may change without notice. The manufacturer assumes no re-
sponsibility for any errors which may appear in this guide.
DEC, thickwire, thinwire, VMS, VT100, and ULTRIX are trademarks of Digital Equip-
ment Corporation. UNIX is a registered trademark of AT&T. Ethernet is a trademark of
XEROX. NetWare is a trademark of Novell Corp. AppleTalk, Chooser and Macintosh are
trademarks of Apple Computer Corp.
Copyright 1994, Lantronix. All rights reserved. No part of the contents of this book
may be transmitted or reproduced in any form or by any means without the written
permission of Lantronix. Printed in the United States of America.
The revision date for this manual is September 28, 1994.
This equipment has been tested and found to comply with the limits for a Class A digital
device pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable
protection against such interference when operating in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy, and if not installed and
used in accordance with this guide, may cause harmful interference to radio communica-
tions.
Operation of this equipment in a residential area is likely to cause interference in which
case the user, at his or her own expense, will be required to take whatever measures may
be required to correct the interference.
Warning: Changes or modifications to this device not explicitly approved by Lantronix will
void the user's authority to operate this device.
Cet appareil doit se soumettre avec la section 15 des statuts et règlements de FCC. Le fonc-
tionnement est subjecté aux conditions suivantes:
(1) Cet appareil ne doit pas causer une interférence malfaisante.
(2) Cet appareil doît accepter n'importé quelle interférence reìue qui peut causer une
opération indésirable.
Part Number: 900-040
WARNING

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  • Page 1 XEROX. NetWare is a trademark of Novell Corp. AppleTalk, Chooser and Macintosh are trademarks of Apple Computer Corp. Copyright 1994, Lantronix. All rights reserved. No part of the contents of this book may be transmitted or reproduced in any form or by any means without the written permission of Lantronix.
  • Page 2 LSB4 Installation Guide For Lantronix LSB4 Ethernet Switch...

  • Page 3: Table Of Contents

    Reduction of Packet Traffic ..........1-2 Management of Packet Traffic..........1-3 Initial LSB4 Configuration ..............1-3 Networks and Protocols Supported ............ 1-4 LSB4 vs. Other Methods ................ 1-5 Installation Installation Instructions................. 2-1 Initializing the LSB4 ................2-4 Initial LSB4 Configuration ..............2-6 Changing System Passwords..............
  • Page 4 Set-up and Operation Accessing the LSB4................. 3-1 Connections from TCP/IP Hosts ........3-2 Connections from VMS Hosts ..........3-6 Connections from Netware Hosts........3-7 Connections from Macintosh Hosts using AppleTalk..3-9 Editing Command Entries..............3-9 Editing Keys ................3-9 Automatic Command Completion ........3-11 Common Configuration Changes ............
  • Page 5 Warranty Glossary Index...

  • Page 7: Introduction

    Introduction What the LSB4 Does .................. 1-1 Advantages of the LSB4 ................1-2 Reduction of Packet Traffic ............1-2 Management of Packet Traffic ........... 1-3 Initial LSB4 Configuration ................ 1-3 Networks and Protocols Supported ............1-4 LSB4 vs. Other Methods................1-5...

  • Page 8: What The Lsb4 Does

    What the LSB4 Does The LSB4 switch switches packets between different local area network segments. The different segments are defined by where the LSB4 is placed. A local area network can be divided into four segments. When a packet is received, the LSB4 completes the following steps:...

  • Page 9: Advantages Of The Lsb4

    Management of packet traffic Reduction of Packet Traffic The LSB4 is designed to be connected to an Ethernet; it will divide the Ethernet into 4 network segments. The LSB4 will isolate each segmentÕs lo- cal packet traffic; in other words, packets that are not destined for another segment of the network will not pass through the switch.

  • Page 10: Management Of Packet Traffic

    Management of Packet Traffic The LSB4 does not add or change any of the information in the packets that passes through the switch. However, it can be configured to regulate the passage of certain packet traffic through the use of filters . Filters prevent the passage of particular packets from one segment to another.

  • Page 11: Networks And Protocols Supported

    Networks and Protocols Supported The LSB4 supports and processes packets for any Ethernet network. The operation of the LSB4 is fully compliant with both the IEEE 802.3 Ethernet specification and the IEEE 802.1d Bridge specification. The LSB4 operates independently of the different protocols used in pack- ets.

  • Page 12: Lsb4 Vs. Other Methods

    LSB4 Installation Guide Introduction LSB4 vs. Other Methods A switch differs significantly from other methods of connecting Ethernet segments together. A few examples of segment connection and the ways in which they differ from a network switch are discussed in Table 1-1.
  • Page 13 Introduction LSB4 Installation Guide...

  • Page 14: Installation

    Installation Installation Instructions................2-1 Initializing the LSB4 ................... 2-4 Initial LSB4 Configuration ................ 2-6 Changing System Passwords..............2-7 IP Address Configuration ................. 2-8 Power-up Troubleshooting ..............2-10...

  • Page 15: Installation Instructions

    See Figure 2-1 on page 2-2 for an illustration of the LSB4. For connector specifications and configuration, see the LSB4 Reference NOTE Manual. The LSB4 is configured at the factory to operate in any network configura- tion. For specific configuration instructions, see Chapter 3, Set-up and Op- eration .
  • Page 16 Fabriqué in Etats-Unis AC input LSB4 Figure 2-1: LSB4 Back and Front Panels The illustrations on the following page [Figure 2-2 and Figure 2-3] are ex- amples of the placement and connection of the LSB4 to different types of networks.
  • Page 17 LSB4 Installation Guide Installation MicroVAX Thickwire 10BaseT Hub 10Base2 Repeater Thinwire LSB4 Macintosh Macintosh MicroVAX Netware Twisted Pair File Server Figure 2-2: Network Configuration Example ( Thickwire ) MicroVAX Netware File Server LTX-TA LSB4 Transceivers Thinwire 10BaseT Hub 10Base2 Repeater...

  • Page 18: Initializing The Lsb4

    Installation LSB4 Installation Guide Initializing the LSB4 Each time the LSB4 is turned on, it will go through an initialization pro- cess. The process consists of the following steps: Power-on diagnostic tests will last approximately 5 seconds. The contents of the LSB4's internal Flash ROM will be checked for validity and then executed.
  • Page 19 %% Ethernet 1 Address: Internet Address: (Undefin %% Ethernet 2 Address: 00-80-A3- xx-xx-xx %% Ethernet 3 Address: 00-80-A3- xx-xx-xx %% Ethernet 4 Address: 00-80-A3- xx-xx-xx Figure 2-4: Startup Messages When all of the above is complete, the LSB4 is running normally.

  • Page 20: Initial Lsb4 Configuration

    LSB4 on again. Initial LSB4 Configuration The LSB4 will operate properly in all local area networks without the need for any configuration changes. After the power-up initialization process, the LSB4 will automatically start learning the different node addresses connected to its ethernet ports and will start to process traffic within ap- proximately one minute of power-up.

  • Page 21: Changing System Passwords

    NOTE user level. The login password is required for logging into the LSB4 through a net- work connection. The default login password is access; it can be changed with either the Set System Login Password or Define System Login Pass- word command.

  • Page 22: Ip Address Configuration

    The address can be defined using a terminal connected to the serial port, or via a host BOOTP or RARP server. To define the IP address via the serial port, connect a terminal to the LSB4, become the privileged user and issue the Set and Define Protocol IP IP- address commands [Figure 2-6].
  • Page 23 IP address permanently. It is intended as a temporary measure to enable the administrator to telnet into the LSB4Õs console port. Any host wishing to access the LSB4 will have to be told of the LSB4's IP address. This is typically configured in the file /etc/hosts or via a name-...

  • Page 24: Power-Up Troubleshooting

    LSB4 Installation Guide Power-up Troubleshooting There are several possible error situations if the terminal connected to the serial port does not display the welcome message or the LEDs on the LSB4 do not light properly. Condition All serial and network port LEDs display a specific pattern denot- ing the exact failure.
  • Page 25 Attempting MOP boot..Will wait 1 minute for next download attempt... Figure 2-9: LSB4 Searching For Instruction File If the last line in the above message appears, the LSB4 has been unable to find and load the instruction file. Cause: Usually this occurs if the LSB4 is disturbed while downloading a file containing instructions for the LSB4's Flash ROM.
  • Page 26 LSB4 Installation Guide Condition: All tests have passed and the unit is operating normally, but it ap- pears that no packet traffic is being forwarded by the LSB4 to the different segments of the local area network. Cause: There are several conditions that can cause this problem. Often it is caused by incorrect or faulty network cable connections or in- correct network hardware configuration.
  • Page 27 Set-up and Operation Accessing the LSB4 ..................3-1 Connections from TCP/IP Hosts ..........3-2 Connections from VMS Hosts ........... 3-6 Connections from Netware Hosts..........3-7 Connections from Macintosh Hosts using AppleTalk ... 3-9 Editing Command Entries ................ 3-9 Editing Keys ................. 3-9 Automatic Command Completion .........

  • Page 28: Set-Up And Operation

    Set-up and Installation Operation...

  • Page 29: Accessing The Lsb4

    Installation. To start using the terminal after it is physically connected, press Return until a user prompt appears. How the LSB4 is accessed through one of the LSB4's ethernet ports will de- pend on the requirements of the network host. There are several different...

  • Page 30: Connections From Tcp/Ip Hosts

    IP address, and logging into the LSB4. Obtaining an IP Address An IP address is required in order to log into the LSB4 from a TCP/IP host. The address can be defined using a terminal connected to the serial con- sole port, or via a BOOTP or RARP host.
  • Page 31 BOOTP daemon to respond. If the LSB4 has no IP address, it will set its address from the first directed IP address it receives. To generate such a packet, create an entry in the hostÕs ARP table [Figure 3-2].
  • Page 32 At the prompt type one of the following [Figure 3-4]: unix% telnet nnn.nnn.nnn.nnn unix% rlogin nnn.nnn.nnn.nnn Figure 3-4: Login Commands where nnn.nnn.nnn.nnn is the IP address of the LSB4. nnn is a decimal number from 0 to 255. The following text will be displayed [Figure 3-5]: Trying nnn.nnn.nnn.nnn Connected to nnn.nnn.nnn.nnn...
  • Page 33 LSB4 Installation Guide Set-up and Operation Type a username at the prompt and press the Return key. The LSB4 can then be configured as if at a terminal connected to the serial console port. The session can be ended by typing Ctrl-D or logout.

  • Page 34: Connections From Vms Hosts

    Username> Figure 3-9: Text Displayed Before Login Type a username at the prompt and press the Return key. The LSB4 can then be configured as if at a terminal connected to the serial console port. The session can be ended by typing Ctrl-D or logout.

  • Page 35: Connections From Netware Hosts

    Connections from Netware Hosts For PC hosts using Netware, the BRCON utility program is provided with the LSB4 on a DOS diskette. BRCON enables a PC host to log into or issue commands to the LSB4. To use the BRCON utility, a Netware file server connection must be open, or the NetWare workstation shell program must be running.
  • Page 36 Username> Figure 3-14: Username Prompt Type a username at the prompt and press the Return key. The LSB4 can then be configured as if at a terminal connected to the serial console port. To logout of the LSB4, press Ctrl-D or type logout.

  • Page 37: Connections From Macintosh Hosts Using Appletalk

    LSB4 Installation Guide Set-up and Operation Connections from Macintosh Hosts using AppleTalk The MACCON utility program is supplied with the LSB4 on a Macintosh diskette. MACCON enables a Macintosh using AppleTalk to log into or is- sue commands to the LSB4.
  • Page 38 Set-up and Operation LSB4 Installation Guide Purpose Return Executes the command line Delete Deletes the character immediately left of the cursor Ctrl-A Toggles insert mode (insert or overwrite) Ctrl-D or Ctrl-Z Logs out of the switch Ctrl-E Moves the cursor to the end of the line...

  • Page 39: Automatic Command Completion

    Partial Command Completion Partial command completion completes a partially-typed command when the Space Bar or Tab key is pressed. If the LSB4 cannot determine the re- mainder of a partially-typed command, it will beep and wait for user in put.

  • Page 40: Common Configuration Changes

    NOTE ual. Common Configuration Changes As stated in Chapter 2, the LSB4 does not require additional configuration to operate properly in a local area network. Customization of the LSB4 is optional, and includes the following: Password protection System configuration Serial console port characteristics...

  • Page 41: System Configuration

    The system name is used by NetWare and AppleTalk networks to remote- ly access the LSB4. The LSB4 will be identified as LSB4_xxxxxx. The xÕs represent the last six digits of the switchÕs ethernet address. The switch name can be changed using the Set/Define System Name command, shown in Figure 3-16.
  • Page 42 If the LSB4 is connected to an AppleTalk network that includes a router, the LSB4 will join the default zone specified by the router. In this case, the LSB4 and other Macintosh devices in the same zone will be seen by each other.

  • Page 43: Customizing Serial Console Port Settings

    Local> SET PORT FLOW XON Local> SET PORT COMMAND ENABLED Figure 3-20: Set/Define Port Examples To make Set Port commands permanent, use the Save Port or the Define Port command. For information about the Save command, refer to the LSB4 Reference Manual. NOTE 3-15...

  • Page 44: Switch Configuration

    Set-up and Operation LSB4 Installation Guide The LSB4 doesn't need to be rebooted in order for Define Port commands to take effect; they will take effect as soon as the port is logged out or fin- ishes a print job.
  • Page 45 Spanning Tree packet multi- casts Set/Define Switch Maximum Age Spanning Tree Controls the time period that the LSB4 will wait after the last Spanning Tree packet before it looks for a new root switch Set/Define Switch Ethernet port Spanning Tree...

  • Page 46: Filter Configuration

    LSB4 Installation Guide Filter Configuration When a packet is received at an LSB4 port, the source and destination ad- dresses of the packet are compared. If the address of the source and desti- nation of a packet are the same, the packet is presumed to be at its final destination and doesn't need to travel any further.
  • Page 47 The Set Switch command used above did not specify a particular ethernet port to be used with filter 1, as a result, all LSB4 ports will deny IP traffic. In the following example [Figure 3-23], only traffic from source hardware address 00-80-a3-01-02-03 and source hardware address 00-80-a3-aa-bb-cc will be forwarded by the LSB4.
  • Page 48 LSB4 Installation Guide Set-up and Operation 3-20...

  • Page 49: Technical Support

    Aappnumber Technical Support If you are experiencing problems with the LSB4 or have suggestions for improving the product, please contact Lantronix Technical support at the address or phone number listed below. We are also reachable via Internet electronic mail; the ad- dress is support@lantronix.com.
  • Page 50 LSB4 Installation Guide Technical Support...

  • Page 51: Spanning Tree Algorithm

    Figure B-1: Multiple Paths Between Segments The Spanning Tree Algorithm is a method used to sense the structure of the network and prevent multiple paths between network segments. The LSB4 uses the Spanning Tree Algorithm as defined by the IEEE specifica- tion 801.2d.
  • Page 52 The Spanning Tree Algorithm is fully incorporated into the LSB4 and will be enabled by default. To disable the algorithm, use the Set/Define Switch...
  • Page 53 LSB4 Installation Guide Spanning Tree Algorithm Caution should be exercised when disabling the Spanning Tree Algo- rithm. If there are multiple paths, packets could be forwarded continu- ously, resulting in packet storms and node crashes. It is highly recommended that all switches on a network enable the Spanning Tree NOTE Algorithm.
  • Page 54 The switch will collect hardware address information for its internal address table. The learning state is entered when the listening Forward Delay interval has expired; the LSB4 will remain in the learning state for another Forward Delay interval. The switch will forward packets from one segment...
  • Page 55 LSB4 Installation Guide Spanning Tree Algorithm Particular events on the network can cause the switch to return to the Lis- tening and Learning states. Selection of a new root is usually the event that will cause this transition. If the Spanning Tree Algorithm is disabled with a Set/Define Switch Spanning command, the port state can only be Disabled, Forwarding, Testing, or Overflow.
  • Page 56 LSB4 Installation Guide Spanning Tree Algorithm...

  • Page 57: Pinouts

    Cappnumber Pinouts Figure C-1 shows the pinouts for wiring the LSB4 serial connector. Note that these pinouts assume that the 8-conductor cable connecting the LSB4 and the Adapter block is a swapped cable. RJ45-DB25 LSB4 Cable Adaptor RJ45 RJ45 DB25...
  • Page 58 DB25 pin 7 Figure C-2: RJ45 to DB25 Adapter A small square connector is provided with the LSB4 adapters. This con- nector is used to connect both transmit and receive grounds from the RJ45 cable to the single signal ground on the DB25. The connector inter- nally splices the two wires together and provides one wire into the DB25 connector.
  • Page 59 LSB4 Installation Guide Pinouts Sealed at this end RJ45 Tx Return (Pin 4) RJ45 Rx Return (Pin 5) DB25 Signal Ground (Pin 7) Figure C-3: Wire Splicer To splice the wires, cut off the end of the wire that does not extend through the connector and insert both wires into the connector.
  • Page 60 Pinouts LSB4 Installation Guide RJ45 to DB9 (IBM PC Standard) Pinouts To connect the LSB4 serial port to a DB9 connector using IBM PC stan- dard pinouts, the following pinouts should be used [Figure C-4]. RJ45-DB9 LSB4 Cable Adaptor RJ45...
  • Page 61 Lantronix switches are RS-423 compliant, and are thus limited by the equipment at the remote end of the serial line. If the LSB4 is connected to an RS-232 device, it is subject to the RS-232 limits shown below. If con- nected to an RS-422 device, it is subject to the RS-422 limitations.
  • Page 62 LSB4 Installation Guide Pinouts...

  • Page 63: Snmp Support

    Bridge MIB. The MIBs and SNMP in general are documented in RFCs 1066, 1286, 1067, 1098, and 1213. The LSB4 supports RFC 1286. NOTE The LSB4 has the ability to access the facilities of the Management Infor- mation Base for SNMP command management on TCP/IP-based net- works.
  • Page 64 SNMP Support LSB4 Installation Guide The following SNMP object groups are supported: system OBJECT IDENTIFIER ::= {mib-2 1} interfaces OBJECT IDENTIFIER ::= {mib-2 2} OBJECT IDENTIFIER ::= {mib-2 3} OBJECT IDENTIFIER ::= {mib-2 4} icmp OBJECT IDENTIFIER ::= {mib-2 5}...

  • Page 65: Updating Lsb4 Software

    Eappnumber Updating LSB4 Software The latest version of the Lantronix LSB4 software and its associated release note can obtained in three ways: from a diskette or other media (if, for ex- ample, a diskette was mailed from Lantronix), by downloading directly from the Lantronix development systems through the Lantronix bulletin board system (BBS), or by using anonymous ftp through the Internet.
  • Page 66 The Flash ROM software is contained in a file called LSB.SYS, provided with the LSB4 on a floppy diskette. This file must be accessible when up- dating Flash ROM. Flash ROM can be updated using any of the following host protocols: TCP/IP, VAX/VMS, or Netware.
  • Page 67 LSB4's Flash ROM. As described in Chapter 2, the serial LED and LAN port LEDs will quickly blink orange while the LSB4 is in boot mode (and reloading code), then slowly blink green when the LSB4 returns to normal operational mode.
  • Page 68 The LSB4's service characteristic must be enabled on the host's Ethernet circuit. See the NCP documentation for more details about the service characteristics. To download the LSB.SYS file from the host to the LSB4, enter the follow- ing commands [Figure E-2]: Local> SET PRIVILEGED Password>...
  • Page 69 Updating With BRCON For PC hosts using Netware, the BRCON utility program is provided with the LSB4 on a DOS diskette. BRCON enables a PC host to log into or easily issue commands to the LSB4. BRCON will copy the new version of LSB.SYS from a floppy diskette into the LOGIN directory of the file server, configure the LSB4 with the proper download file name and path, and issue the re-load command.
  • Page 70 Copy the LSB.SYS into the LOGIN directory on the NetWare file server. Without the BRCON utility, an LSB4 connection cannot be established; the LSB4 will only be able to access files in the LOGIN directory. Enter the following commands to re-load the LSB.SYS file into the LSB4 [Figure E-5].
  • Page 71 LSB4 Installation Guide Updating LSB4 Software Updating the LSB4 using BCP The Boot Configuration Program enables a user to configure the LSB4 in the following situations: when the LSB4 fails during initialization, or when an Initialize Noboot command is entered.
  • Page 72 Updating LSB4 Software LSB4 Installation Guide Set System Netserver fileserver: Specifies the name of the NetWare file server from which the LSB4 will attempt to load the LSB.SYS file. fileserver is any combination of characters. Set System Software filename: Specifies the name of the file to load. The LSB4 will automatically add .SYS to the specified file name.

  • Page 73: Troubleshooting Flash Rom Updates

    In the event that the error cannot be determined, examine the following list of common errors. For NetWare users, verify that the LSB.SYS file is in the LOGIN directory. As the LSB4 cannot actually log into the NetWare file server, it has very limited access to the file server's directories.
  • Page 74 LSB4 Installation Guide Downloading from the Lantronix BBS The Lantronix bulletin board system (BBS) uses Telebit T2500 modems ca- pable of v.32, v.42, v.42bis, 9600/2400/1200 baud operation. Kermit and PEP file transfer protocols are available to download the file. Make sure that the Kermit file type is set to binary mode.
  • Page 75 LSB4 Installation Guide Updating LSB4 Software Username: LSB4 Password: LANSWITCH (not echoed) Welcome to the Lantronix Software Distribution System. File Name Version ---------------------------------------- LSB.SYS V1.0/10 [.1010]LSB.SYS Please download and read release notes before installing new code. (Note: this is important...) NOTE: All software is also available via anonymous ftp at ftp.lantronix.com.
  • Page 76 Updating LSB4 Software LSB4 Installation Guide Obtaining Software via the Internet The latest version of the Lantronix LSB4 software and its associated release notes can be obtained directly from Lantronix using ftp (file transfer pro- tocol) through Internet. To access the Lantronix ftp file server, use ftp.lantronix.com. This current- ly resolves to IP address 192.73.220.81, but is subject to change at any time.
  • Page 77 LSB4 Installation Guide Updating LSB4 Software Enter the following to connect to the Lantronix ftp file server [Figure E-7]: % ftp ftp.lantronix.com Connected to ftp.lantronix.com 220 Welcome to the Lantronix FTP server. 220 [...] (Welcome message) Name: (ftp.lantronix.com:xxxx): anonymous 331: Guest login ok, send ident as password.
  • Page 78 Introduction Updating Updating LB Software LSB4 Software...

  • Page 79: Lsb4 Specifications

    Altitude Limitations Operating: 2.4 km (8000 ft.) Storage: 9.1 km (30,000 ft.) If operating the LSB4 above 2.4 km (8000 ft.), decrease the operating tem- perature rating by 1.8 C for each 1000 m (1 F for each 1000 ft.)
  • Page 80 Specifications LSB4 Installation Guide Relative Humidity Limitations Operating: 10% to 90% (noncondensing) 40% to 60% recommended Storage: 10% to 90% (noncondensing) Power Supply Cord Specifications Cord type: 3 conductors, 1.0 mm minimum conductor size (approx. 18 AWG) Rated for 250 Volts AC, 10 Amps Length: 3.0 meters...

  • Page 81: Specifications

    LSB4 Installation Guide Specifications Approvals The cord connectors used should bear the approval mark of at least one of the following regulatory and safety agencies [Figure F-1]: CEBEC Belgium (CEBEC) Finland (EI) Austria (OVE) Denmark (DEMKO) Germany (VDE) Netherlands (KEMA)

  • Page 82: Warranty Statement

    Warranty Warranty Statement Lantronix warrants for a period of FIVE YEARS from the date of shipment that each Lantronix LSB4 Switch sup- plied shall be free from defects in material and workmanship. During this period, if the customer experiences difficulties with a product and is unable to resolve the problem by phone with Lantronix Technical Support, a Return Material Authorization (RMA) will be issued.
  • Page 83 LSB4 Installation Guide Warranty...
  • Page 84 This enables the LSB4 to know which of its ports to forward traf- fic to. If no packets are received by the LSB4 from an address within a certain time period (weed time;...
  • Page 85 Glossary LSB4 Installation Guide BRCON A program that enables a user to connect to the LSB4 from a NetWare host. To use BRCON, see Appendix E. Bridge A device that moves (ÒswitchesÓ) packets from one network segment to another. The LSB4 moves packets according to the scheme described in the IEEE 802.1d bridging...
  • Page 86 14880 packets per second. Learning State When the Spanning Tree Algorithm is enabled, the LSB4 can be in a number of different states. During the Learning state, the LSB4 collects hardware address information for its internal address table.
  • Page 87 IP addresses. Overrun An overrun results when there is not sufficient memory on the LSB4 for it to receive packets. Overruns may occur when the network is ex- tremely busy; for example, when the number of packets per second traveling on the network exceeds the LSB4Õs forwarding or filtering rate.
  • Page 88 A method used to ensure that there is only one possible path between network segments. The Spanning Tree Algorithm is enabled by default on the LSB4. For details, refer to Appendix B. Switch A device that moves (ÒswitchesÓ) packets from one network segment to another.
  • Page 89 LSB4 Installation Guide Glossary Glossary-vi...
  • Page 90 Index ....3-1 Accessing the LSB4 ..3-9 Editing command entries ....F-1 Altitude requirements ......3-9 Editing keys ......A-1 Bugs, reporting ....2-6 Factory configuration ....E-2 Flash ROM, reloading Command completion ....3-11 Command recall Partial command ....F-2 Humidity limitations ......3-11 completion ....3-9 Commands, editing ....2-6...
  • Page 91 Index LSB4 Installation Guide .....C-5 LSB4 Serial cable limits ....1-2 ......D-1 Advantages of SNMP support Comparison to other segment Software updates ......1-5 ..E-10 connectors Downloading from BBS ......1-1 ......E-7 Function of Using BCP ...1-3 ....E-12 Initial configuration Using Internet ..E-5...

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