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LSB4 Installation Guide Spanning Tree Algorithm

B-3

Introduction

Spanning Tree

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
Algorithm. If one or more switches have the Spanning Tree Algorithm
disabled, care must be taken to avoid network loops.

The Spanning Tree Algorithm designates one of the switches as the

primary

or

root

on the network. If there is only one switch, it is obviously

the root. If there is more than one, the hardware addresses and priority
factors will be used to select the root.

Once a root is chosen, it will send out packets called

Bridge Protocol Data

Units

(BPDUs) to each of its segments. Switches receiving the

BPDUs will send them to their other segment, propagating BPDUs
throughout the network.

Each switch throughout the network will then know from which ethernet
port it should be receiving Bridge Protocol Data Units. If a switch receives
one on a different port, it knows that there has been a change in the net-
work configuration and it will re-establish a single path to each LAN seg-
ment. Conversely, if the switch stops hearing Bridge Protocol Data Units
completely, it will know a link has failed and a new path must be estab-
lished.

If the root stops operating, a new root will be selected based on switch pri-
ority and hardware address.

NOTE

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Содержание LSB4

Страница 1: ...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 ar...

Страница 2: ...LSB4 Installation Guide For Lantronix LSB4 Ethernet Switch ...

Страница 3: ...gement of Packet Traffic 1 3 Initial LSB4 Configuration 1 3 Networks and Protocols Supported 1 4 LSB4 vs Other Methods 1 5 2 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 ...

Страница 4: ...pleTalk 3 9 Editing Command Entries 3 9 Editing Keys 3 9 Automatic Command Completion 3 11 Common Configuration Changes 3 12 Password Protection 3 12 System Configuration 3 13 Customizing Serial Console Port Settings 3 15 Switch Configuration 3 16 Filter Configuration 3 18 A Technical Support B Spanning Tree Algorithm C Pinouts D SNMP Support E Updating LSB4 Software F LSB4 Specifications ...

Страница 5: ...iii G Warranty Glossary Index ...

Страница 6: ...iv ...

Страница 7: ...troduction 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 ...

Страница 8: ...al table which con tains the source and destination addresses of the different devices on the network If the source Ethernet address of the packet the address of the Ethernet where the packet originated is not in the table it is added to it 2 The destination Ethernet address of the packet where the packet is going is examined If the destination Ethernet address matches the current Ethernet the pac...

Страница 9: ... 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 This reduces un wanted packet traffic on other segments of the network Figure 1 1 illustrates the use of the LSB4 Figure 1 1 LANs With and Without LSB4 LAN With...

Страница 10: ...tain packet traffic through the use of filters Filters prevent the passage of particular packets from one segment to another For more information about filters see the Filter Commands chapter of the LSB4 Reference Manual Initial LSB4 Configuration When the switch boots up it will be configured in the following manner Automatic filtering and forwarding of packets will take place To customize packet...

Страница 11: ... in pack ets Unless a particular protocol is specified using the Set Define Filter command the bridge will pay no attention to a packet s protocol Remote connections can be made through one of the LAN ports using any of the following protocols AppleTalk NetWare Telnet Rlogin or MOP NCP TSM The protocols may be disabled in order to improve perfor mance In addition to the protocols listed above the ...

Страница 12: ...ted With a switch installed each segment connected by the switch may use the maximum amount of cable length and maximum number of connected devices Connecting segments with a repeater A repeater forwards all network traffic including problems such as collisions Rather than automatical ly forwarding all traffic a switch forwards only pack ets intended for that particular Ethernet segment Nodes no l...

Страница 13: ...Introduction LSB4 Installation Guide 1 6 Introduction ...

Страница 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 ...

Страница 15: ...sserialconsoleport op tional The port is configured at the factory for 9600 baud 8 data bits no parity and one stop bit Plug the power cord into the AC input on the LSB4 and into an AC power source See Figure 2 1 on page 2 2 for an illustration of the LSB4 For connector specifications and configuration see the LSB4 Reference Manual The LSB4 is configured at the factory to operate in any network co...

Страница 16: ...s Serial 95 250V 50 60Hz 0 5A T2A 250V CAUTION For continued protection against risk of fire replace only with same type and ratings of fuse Made in U S A Fabriqué in Etats Unis This equipment complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 the device may not cause harmful interference and 2 this device must accept any interference received including i...

Страница 17: ...Network Configuration Example Thinwire 10BASE T Thickwire 10BaseT Hub Twisted Pair Macintosh Netware File Server Sun MicroVAX 10Base2 Repeater Thinwire Macintosh Sun MicroVAX LSB4 10BaseT Hub Macintosh Netware File Server Sun MicroVAX Macintosh Thinwire 10Base2 Repeater MicroVAX Netware File Server LTX TA Transceivers LSB4 LTX 2A ...

Страница 18: ... test being run If the unit fails power up diagnos tics it will display a fixed pattern If the LEDs display a fixed pattern contact Lantronix technical support for additional information If the unit passes its power up diagnostics all serial and network port LEDs will show green for three sec onds When the LSB4 is operational the serial LED will be green and blink every second or more often if the...

Страница 19: ... xx Internet Address undefined Current Diagnostics Report RISC 3051 4K I 2K D CPU Speed 20 MHz RAM Size 1 MB Flash Size 512 K Flash Version n n Gate Array Rev n n Errors None Checking 8 sections from flash From address 0xnnn to 0xnnn nnn bytes From address 0xnnn to 0xnnn nnn bytes From address 0xnnn to 0xnnn nnn bytes From address 0xnnn to 0xnnn nnn bytes From address 0xnnn to 0xnnn nnn bytes From...

Страница 20: ...different node addresses connected to its ethernet ports and will start to process traffic within ap proximately one minute of power up The LSB4 can be configured further for example to filter certain packet traffic or to enable logins from other network nodes Configuration is done through the use of specific commands There are several ways to en ter these commands Connect a terminal to the LSB4 s...

Страница 21: ...rd to obtain the privileged 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 To begin using the terminal connected to the serial console port press Return until a user prompt appears Use of the Set Define System P...

Страница 22: ...rotocol IP Commands To configure the IP address using RARP or BOOTP see the RARP BOOTP server s documentation Many BOOTP daemons will not reply to a BOOTP request if the down load filename in the configuration file does not exist If this is the case create a file in the download path to get the BOOTP daemon to respond To configure the IP address using ARP create an entry in the hostÕs ARP table Fi...

Страница 23: ...s to see if anyone else is us ing this address If no duplicates are found the switch will use this IP ad dress and will respond to the ping packet The LSB4 will not save this learned 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...

Страница 24: ...ro ceed further Cause The LSB4 has detected a fatal hardware fault Action Contact your hardware dealer or Lantronix Condition An error is detected during power up that is non fatal the LSB4 continues to boot up but will not begin normal operation The se rial LED will blink orange If a terminal is connected to the serial console port a diagnostic message is displayed The terminal dis plays a Boot p...

Страница 25: ...ial console port Figure 2 9 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 The stored instructions become corrupted Action Reload the file containing the Flash ROM in...

Страница 26: ... of the ports Where Show Monitor List Switch and Set Define Switch com mands are used ÒBridgeÓ can be used in place of ÒSwitch Ó For example List Bridge has the same functionality as List Switch If Show Switch Status displays that a port is in the testing state there is a faulty network connection Check the cable connections If Show Switch Status displays that a port is in the overflow state there...

Страница 27: ...onnections 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 3 12 Password Protection 3 12 System Configuration 3 13 Customizing Serial Console Port Settings 3 15 Switch Configuration 3 16 Filter Configuration 3 18 ...

Страница 28: ...3 Set up and Operation Installation Set up and Operation ...

Страница 29: ...ussed in Chapter 2 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 host types TCP IP VAX VMS NetWare AppleTalk Each host type listed above requires a somewhat different approach when con...

Страница 30: ...ial port connect a terminal to the LSB4 become the privileged user and issue the Set and Define Protocol IP IP Address commands Figure 3 1 The Set command configures something now but is not permanent De fine changes a setting permanently but does not take effect until the LSB4 is rebooted or initialized For more information on Set and Define commands refer to the LSB4 Reference Manual Please note...

Страница 31: ...d IP address and the hardware address of the switch Then ping the switch using the following command Figure 3 3 Figure 3 3 Ping Command When the switch receives the ping packet it will notice that its IP address is currently not set and will send out broadcasts to see if anyone else is us ing this address If no duplicates are found the switch will use this IP ad dress and will respond to the ping ...

Страница 32: ... 5 Text Displayed Before Login At the prompt type the login password The password will not be dis played The default login password is access This password can be changed us ing the Set Define System Login Password command The following text will be displayed Figure 3 6 Figure 3 6 Text Displayed Upon Login unix telnet nnn nnn nnn nnn unix rlogin nnn nnn nnn nnn Trying nnn nnn nnn nnn Connected to ...

Страница 33: ...le Connections The LSB4 enables a TCP IP user to configure the server via a single telnet connection to the remote console port The remote console port is desig nate as port 7000 To make a connection to this port use the telnet com mand Figure 3 7 Figure 3 7 Connecting to Console Port Note that the prompt requires that the login password be entered before the connection can be made The default log...

Страница 34: ...e login password The password will not be dis played The default login password is access This password can be changed us ing the Set Define System Login Password command The following will be displayed Figure 3 9 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...

Страница 35: ...d or insert the LSB4 diskette into the A drive and type the following command Figure 3 10 Figure 3 10 BRCON Command A list of the parameters that can be used with the BRCON command will be displayed Figure 3 11 Figure 3 11 BRCON Command List LSB4name represents the LSB4 service name The service name is LSB4_ underscore followed by the last three bytes of port 1Õs hardware ad dress For example if t...

Страница 36: ...rd is access This password can be changed us ing the Set Define System Login Password command The following will be displayed Figure 3 14 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 C BRCON LSB4_xxxxxx Connection establish...

Страница 37: ... MACCON icon to launch the program The screen will display AppleTalk zones and known Lantronix devices connected to the network Clicking on any AppleTalk zone name will display the devices in that zone Double click on any node name to log into that node or enter con figuration commands Click the Quit button to exit MACCON Editing Command Entries The LSB4 offers two features to assist you when ente...

Страница 38: ... Moves the cursor to the end of the line Ctrl H or Backspace Moves the cursor to the beginning of the line Ctrl R Displays the current command Ctrl U Deletes the entire current line Right Arrow Moves the cursor to the right Left Arrow Moves the cursor to the left Up Arrow or Ctrl P Recalls the previous command Down Arrow or Ctrl N When scrolling through previously entered com mands displays the ne...

Страница 39: ...tered a blank line will be displayed when the Up Arrow or Down Arrow keys are pressed In addition to command recall the LSB4 supports the UNIX command history list feature which is activated by typing exclamation marks Entering two exclamation marks executes the previous command Typ ing a single exclamation mark and one or more text characters will search for and display the previous command start...

Страница 40: ...network Customization of the LSB4 is optional and includes the following Password protection System configuration Serial console port characteristics Switch configuration Filter configuration This section does not cover all configuration options for a complete dis cussion of LSB4 configuration and commands refer to the LSB4 Refer ence Manual Password Protection The LSB4 is protected with two level...

Страница 41: ...e command shown in Figure 3 16 Privileged access must be obtained before the Set Define System Name command can be used Use the Set Privileged command displayed in the following example to obtain privileged status Figure 3 16 Changing Switch Name Incoming Network Logins By default the LSB4 will prevent all incoming network logins with the ex ception of remote console logins using Telnet NCP TSM co...

Страница 42: ...ne will not be visible If the LSB4 is connected to an AppleTalk network without a router zones will not be configured and all devices on the network including the LSB4 will be visible and accessible to all other Macintosh clients A different AppleTalk zone may be specified by entering a Set Define Protocol AppleTalk Zone command Figure 3 18 Figure 3 18 Specifying AppleTalk Zone The MACCON utility ...

Страница 43: ...amples of Set Define Port commands are shown below Figure 3 20 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 Local LIST PORT Port 1 Username Physical Port 1 Idle Char Size Stop Bits 8 1 Input Speed 9600 Flow Ctrl Xon Xoff Output Speed 9600 Parity None Mo...

Страница 44: ...the terminal characteristics may have to be changed to match Switch Configuration The Set Switch and Define Switch commands can be used to configure two areas of the LSB4 LAN port characteristics and Spanning Tree Algorithm specifications Table 3 2 on page 3 17 describes the available Set Define Switch commands The Spanning Tree Algorithm is enabled by default but can be complete ly disabled if ne...

Страница 45: ...ot switch Set Define Switch Ethernet port Path Cost value Spanning Tree Controls how expensive a port is in terms of packet forward ing time Set Define Switch Spanning Tree Enabled Disabled Spanning Tree Enables or disables the Span ning Tree Algorithm Set Define Switch Weed weed Spanning Tree Controls the time period that the LSB4 will wait before it re moves a nodeÕs hardware ad dress when it ha...

Страница 46: ... used to prevent all but one type of traffic for example traffic from a specific node from reaching a particular network segment When traffic destined for a specific segment reaches the LSB4 it will be compared to a list of filters if it is any but a specified type of traffic it hits a ÒfirewallÓ and goes no further the packet is discarded The commands listed below Figure 3 21 create a firewall be...

Страница 47: ...compared to the third filter Òmulticast allowÓ only if its source address does not match the source addresses specified in the first two filters The fourth filter Òall denyÓ specifies that any packet that is compared to the first three filters without matching them has nei ther of the mentioned source addresses and is not a multicast packet will not be forwarded to any other segments The commands ...

Страница 48: ...LSB4 Installation Guide Set up and Operation 3 20 Introduction Set up and Operation ...

Страница 49: ...92718 USA 714 453 3990 FAX 714 453 3995 Toll Free 800 422 7044 When you report a problem please provide the following information Your name and your company name address and phone number Lantronix model number Serial number of the unit Software version use the Show System command to display Network configuration including the information from a Netstat com mand Description of the problem Debug rep...

Страница 50: ...LSB4 Installation Guide Technical Support A 2 Introduction Technical Support ...

Страница 51: ...seg ments This could result in endless loops of packet traffic on the network Figure B 1 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 Host 1 Host 2 Switch 1 Switch 2 LAN A LAN B Ba...

Страница 52: ... packets out of the disabled port When multiple paths to the same segment have been iden tified the path s with the highest path cost will be disabled The Spanning Tree Algorithm will respond to changes in network config uration If an ethernet port has been disabled due to duplicate paths and the single operational path becomes inoperable a disabled ethernet port will be re enabled in order to rec...

Страница 53: ... than one the hardware addresses and priority factors will be used to select the root Once a root is chosen it will send out packets called Bridge Protocol Data Units BPDUs to each of its segments Switches receiving the BPDUs will send them to their other segment propagating BPDUs throughout the network Each switch throughout the network will then know from which ethernet port it should be receivi...

Страница 54: ...ther Forward Delay interval Forwarding The switch will forward packets from one segment to another unless the port is blocked or disabled or there is a user defined filter preventing the passage Blocked A port is prevented from passing packets from one segment to another This is brought about by the Spanning Tree Algorithm there are multiple paths to the segment and forwarding a packet through thi...

Страница 55: ...eturn 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 The other three states are only reachable when the Spanning Tree Algorithm is enabled NOTE ...

Страница 56: ...LSB4 Installation Guide Spanning Tree Algorithm B 6 Introduction Spanning Tree Spanning Tree Algorithm ...

Страница 57: ...e 8 conductor cable connecting the LSB4 and the Adapter block is a swapped cable Figure C 1 LSB4 Serial Connector Pinouts 1 2 3 4 5 6 DTR RXD SG TXD DSR 20 3 7 2 6 LSB4 RJ45 Cable RJ45 DB25 Adaptor RJ45 DB25 3 4 5 1 2 6 7 8 7 8 6 5 4 8 7 3 2 1 DTR RX TX RX TX out out in DSR in 6 5 4 3 2 6 5 4 8 7 3 2 1 CTS in RTS out 5 4 CTS RTS Cappnumber ...

Страница 58: ...or 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 It is used as shown in Figure C 3 on the following page RJ45 pins 4 5 must both be connected to DB25 pin 7 RJ45 Adapter Pinout DB25 Connector 1 13 14 25 12345678 2 4 8 1 3 5 7 6 123...

Страница 59: ...nd through the connector and insert both wires into the connector Make sure that the wire that does not extend through the connector is in as far as possible to ensure a solid connection Carefully squeeze the connector using a pair of pliers to ensure that it is fully latched Sealed at this end DB25 Signal Ground Pin 7 RJ45 Tx Return Pin 4 RJ45 Rx Return Pin 5 ...

Страница 60: ...nector using IBM PC stan dard pinouts the following pinouts should be used Figure C 4 Figure C 4 IBM PC Standard Pinouts 1 2 3 4 5 6 DTR RXD SG TXD DSR 4 2 5 3 6 LSB4 RJ45 Cable RJ45 DB9 Adaptor RJ45 DB9 3 4 5 1 2 6 7 8 7 8 6 5 4 8 7 3 2 1 DTR RX TX RX TX out out in DSR in 6 5 4 3 2 6 5 4 8 7 3 2 1 CTS in RTS out 8 7 CTS RTS ...

Страница 61: ...e 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 RS 232 lines are limited to 15m 50 ft in length at 9600 baud They will generally work at longer lengths RS 422 lines are limited to 300m 1000 ft ...

Страница 62: ...LSB4 Installation Guide Pinouts C 6 Introduction Spanning Tree Pinouts ...

Страница 63: ... anonymous FTP from nisc jvnc net To obtain a specific RFC use the pathname pub RFC rfcnnn where nnn is the name of the desired RFC To obtain the RFC index use the pathname pub RFC rfc index txt The LSB4 implements the Management Information Bases MIB 2 and Bridge MIB The MIBs and SNMP in general are documented in RFCs 1066 1286 1067 1098 and 1213 The LSB4 supports RFC 1286 The LSB4 has the abilit...

Страница 64: ...TIFIER mib 2 1 interfaces OBJECT IDENTIFIER mib 2 2 at OBJECT IDENTIFIER mib 2 3 ip OBJECT IDENTIFIER mib 2 4 icmp OBJECT IDENTIFIER mib 2 5 tcp OBJECT IDENTIFIER mib 2 6 udp OBJECT IDENTIFIER mib 2 7 ethernet transmission OBJECT IDENTIFIER mib 2 10 snmp OBJECT IDENTIFIER mib 2 11 dot1dbridge OBJECT IDENTIFIER mib 2 17 ...

Страница 65: ...net Us ing the Lantronix BBS and using anonymous ftp are discussed in Down loading from the Lantronix BBS on page E 10 and Obtaining Software via the Internet on page E 12 Questions or comments regarding the ftp or downloading processes can be addressed via electronic mail the Internet mailing address is ftp lantronix com In addition to loading new software this Appendix discusses reloading curren...

Страница 66: ...ands can be used Using TCP IP Hosts Updating the LSB4 using a TCP IP host consists of two steps making the LSB SYS file accessible on the host machine and downloading the LSB SYS file from the host machine to the LSB4 As stated in the previous section the LSB SYS file is shipped with the LSB4 on a DOS diskette This diskette may be used to put the LSB SYS file on the host machine Downloading the LS...

Страница 67: ...s should be used see the example above Use the List System command to check the LSB4 settings before entering the Initialize Reload command The initialization process will take approximately one minute from the time the Initialize command is entered If the LSB SYS file cannot be found or accessed during initialization the LSB4 will re initialize using the cur rent contents of the LSB4 s Flash ROM ...

Страница 68: ...tation 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 Figure E 2 Downloading LSB SYS File The initialization process will take approximately one minute from the time the Initialize command is entered If the LSB SYS file cannot be found or accessed the LSB4 will re initialize using the current conten...

Страница 69: ... the proper download file name and path and issue the re load command After becoming the supervisor on the NetWare host type the following Figure E 3 Figure E 3 Reload Command The following text will be displayed Figure E 4 Figure E 4 Reloading LSB SYS After logging into the LSB4 and entering the Show System command the new software version will be displayed If the LSB SYS file cannot be found or ...

Страница 70: ...character length limit for the path and file name If the path file name contains lower case characters it must be enclosed in quotation marks See the Set Define System command in the LSB4 Reference Manual for more details The Initialize Reload command will initialize the LSB4 As Set System commands will be lost when this occurs Define System commands should be used see Figure E 5 above Use the Lis...

Страница 71: ...the LSB4 Use this command after other configuration commands have been entered Set System Hardware xx xx xx Specifies the LSB4 s base hardware address xx xx xx is the last three bytes hexadecimal characters of the switch s Ethernet address the first three bytes will be supplied automatically The addresses of the other LAN ports are automatically computed from this base address Set System IPaddress...

Страница 72: ...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 Show System This command is used to display the current LSB4 settings Flash Reloads Flash ROM software ...

Страница 73: ...ile 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 For TCP IP hosts using TFTP check the file and direc tory permissions Verify that the loadhost name and address are specified correctly and that their case matches the case of the file names on the host system In addition verify that the host has TF...

Страница 74: ...em 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 BBS phone number 714 367 1051 Account name LSB4 Password LANSWITCH The BBS system will display the following information Figure E 6 page E 11 ...

Страница 75: ...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 Questions and or comments can be mailed to support lantronix com Please enter your first name xxx Please enter your last name xxx Please enter your company name xxx Lantronix Product Menu 1 Use Kermit to Download Softw...

Страница 76: ... ly resolves to IP address 192 73 220 81 but is subject to change at any time The machine issuing the ftp command must be resolvable via the INADDR ARPA DNS record for the connection to succeed If access is denied try using a known machine as a gateway or nameserv er If the connection should work and it does not send email to ftp lantronix com with the machine name s and IP address es and the DNS ...

Страница 77: ... in the pub directory Always transfer the README file in the pub directory before transferring anything else the README file contains a directory of available versions 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 Password Enter your email address here ...

Страница 78: ...LSB4 Installation Guide Updating LSB4 Software E 14 Introduction Updating LB Software Updating LSB4 Software ...

Страница 79: ...50 to 60 Hz Temperature Limitations Operating 5 to 50 C 41 to 122 F Storage 40 to 66 C 40 to 151 F Maximum temperature change per hour is 20 C 36 F Rapid tempera ture changes may affect operation 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 F...

Страница 80: ...olts AC 10 Amps Length 3 0 meters The cord should have a harmonized cable type number ÒHarmonizedÓ refers to an internationally standardized cable descrip tion and is prefixed by the letters HAR An example of a valid harmonized cord type is HAR HO5VV F 3G1 00 Connectors The cord should terminate in a molded on IEC 320 C13 female connector body at one end for proper insertion into the terminal serv...

Страница 81: ...Figure F 1 Approval Marks EMA EUR K Netherlands KEMA N Norway NEMKO NF France UTE Note The above symbols are approximate representations of the actual approval symbols and are for the user s reference only Austria OVE OVE Switzerland SEV S Sweden SEMKO Finland EI FI Germany VDE V D E United Kingdom BSI Denmark DEMKO D United Kingdom ASTA T ASA BS 5750 A S S E S S E D Q U A L IT Y Belgium CEBEC CEB...

Страница 82: ...merchantability or fitness for a particular purpose other than those specifically set out above or by any existing contract between the parties Any such contract states the entire obligation of Lantronix The contents of this doc ument shall not become part of or modify any prior or existing agreement commitment or relationship The information recommendation description and safety notations in this...

Страница 83: ...LSB4 Installation Guide Warranty G 2 Introduction Warranty ...

Страница 84: ... a certain time period weed time see page v the address is deleted from the table Up to 4096 node addresses may be stored in the LSB4 table BCP Boot Configuration Program BCP commands enable the user to configure the LSB4 when it fails during initialization or when the Initialize Noboot command is entered See page E 7 for a listing of all BCP commands BPDU Bridge Protocol Data Unit A type of packe...

Страница 85: ...n used All broadcasts have the same desti nation address Collision Only one node can transmit packets on the eth ernet at a time a collision occurs when two nodes send packets simultaneously When a collision is detected both nodes will wait for a random period of time When that time is elapsed the nodes will attempt to send their packets again Filter A filter controls the passage of particular pac...

Страница 86: ...f its ports This is called flooding All multicast packets see page iv are automatically flooded Forwarding Rate A measurement of the maximum rate at which a switch can forward packets from one network segment to another Using ethernet the maxi mum possible forwarding rate is 14880 packets per second Learning State When the Spanning Tree Algorithm is enabled the LSB4 can be in a number of different...

Страница 87: ...ufficient 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 When an overrun occurs the LSB4 will ignore packets rather than forward them until suffi cient memory becomes available RFC Request for Comments a document that lists ...

Страница 88: ...moves ÒswitchesÓ packets from one network segment to another The LSB4 moves packets according to the scheme described in the IEEE 802 1d bridging specification Unicast A packet that is destined for only one node on a network Weed Time If the LSB4 doesnÕt hear from a hardware ad dress for a period of time it will remove the ad dress from its address table see page i This time interval is the weed t...

Страница 89: ...LSB4 Installation Guide Glossary Glossary vi Introduction Glossary ...

Страница 90: ...artial command completion 3 11 Commands editing 3 9 Configuration initial 2 6 Customization Filters 3 18 LSB4 3 12 Password protection 3 12 Serial console port 3 15 E Editing command entries 3 9 Editing keys 3 9 F Factory configuration 2 6 Flash ROM reloading E 2 H Humidity limitations F 2 I Initialization 2 4 IP address obtaining 3 2 ...

Страница 91: ... to DB9 C 4 Power cord specifications F 2 Power requirements F 1 R RJ45 C 4 S Serial cable limits C 5 SNMP support D 1 Software updates Downloading from BBS E 10 Using BCP E 7 Using Internet E 12 Using Netware hosts E 5 Using TCP IP hosts E 2 Using VAX VMS hosts E 4 Spanning Tree algorithm B 1 Specifications Altitude F 1 Humidity F 2 Power F 1 Temperature F 1 Support technical A 1 Switch function ...

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