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Cabletron Systems CRBRIM-W/E User Manual

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CRBRIM-W/E
USER'S GUIDE

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  • Page 1 CRBRIM-W/E USER’S GUIDE...
  • Page 2 NOTICE Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made. The hardware, firmware, or software described in this manual is subject to change without notice.

  • Page 3: Fcc Notice

    Notice FCC NOTICE This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
  • Page 4 Notice CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT IMPORTANT: Before utilizing this product, carefully read this License Agreement. This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron software program (the “Program”) contained in this package.

  • Page 5: United States Government Restricted Rights

    Notice EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including Its documentation and media). CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO YOU BY CABLETRON IN WRITING, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABLITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH...

  • Page 6: Table Of Contents

    Contents Chapter 1 Introduction 1.1 Using This Manual................1-2 1.2 Document Objectives ............... 1-2 1.3 Document Organization..............1-2 1.4 Document Conventions ..............1-3 1.5 Related Manuals ................1-5 1.6 Getting Help ..................1-5 Chapter 2 Product Overview 2.1 System Specifications ..............2-2 2.2 Memory Configurations ..............
  • Page 7 Contents Chapter 4 Installation 4.1 Tools and Parts Required..............4-1 4.2 Installing the CRBRIM-W/E .............. 4-2 4.2.1 Installing a CRBRIM-W/E into a MIM........ 4-3 4.2.2 Installing the EPIM-3PS............ 4-4 4.2.3 Connecting the CRBRIM-W/E to the EPIM-3PS....4-5 4.3 Making External Connections............4-6 Chapter 5 Troubleshooting the Hardware Configuration...
  • Page 8 Contents Appendix B Virtual Configuration Register Virtual Configuration Register Settings ...........B-1 Changing Configuration Register Settings.........B-3 Virtual Configuration Register Bit Meanings ......B-4 Enabling Booting from Flash............B-8 Copying to Flash ................B-8 Appendix C Bootstrap Program Entering the Bootstrap Program .............C-1 Available Bootstrap Commands..........C-2 Running the Diagnostics ............C-5 Hardware User’s Guide Hardware Installation Guide...

  • Page 9: Chapter 1 Introduction

    Chapter 1 Introduction Welcome to the Cabletron Systems CRBRIM-W/E User’s Guide. This manual describes features, explains installation procedures, and provides specifications for the Cabletron Systems CRBRIM-W/E. The CRBRIM-W/E is designed to reside in, and provide additional connectivity/functionality to, various Cabletron MIMs and hubs (e.g., the EMM-E6, ESXMIM, NBR-420/620 or MicroMMAC).

  • Page 10: Product Overview

    CHAPTER 1: Introduction Using This Manual Read through this manual completely to familiarize yourself with its content and to gain an understanding of the features and capabilities of the CRBRIM-W/E. A general working knowledge of data communications networks and their physical layer components is helpful when using the CRBRIM-W/E.

  • Page 11: Document Conventions

    Document Conventions • Appendix A, “Cabling Specifications,” provides cable illustrations and pinouts for the console port and serial cables. • Appendix B, “Virtual Configuration Register,” discusses the settings for and functions of the virtual configuration register. • Appendix C, “Bootstrap Program,” contains procedures for testing system memory and the central processor unit (CPU) by using the bootstrap diagnostic tests and command options.
  • Page 12 CHAPTER 1: Introduction Means reader take note. Notes contain helpful suggestions or references to materials not contained in this manual. NOTE Means the described action saves time. You can save time by performing the action described in the paragraph. Means reader be careful. You are capable of doing something that might result in equipment damage or loss of data.

  • Page 13: Related Manuals

    Related Manuals Related Manuals Use the following manuals to supplement the procedures and data provided in this manual. This manual references procedures in these manuals, when appropriate, but does not repeat them. Cabletron Systems’ EMM-E6 Installation Guide Cabletron Systems’ EMM-E6 Local Management Guide Cabletron Systems’...

  • Page 14: Chapter 2 Product Overview

    Chapter 2 Product Overview Bridge/Router Interface Modules (BRIMs) reside in, and provide additional connectivity/functionality to, various Cabletron MIMs and hubs (e.g. the EMM- E6 or MicroMMAC). Cabletron’s CRBRIM-W/E remote access router provides multi-protocol router capability for Cabletron MMAC (Multi-Media Access Center) modules with BRIM and EPIM (Ethernet Port Interface Module) slots.

  • Page 15: System Specifications

    CHAPTER 2: Product Overview This publication takes you through the initial hardware installation and selected maintenance procedures. Refer to your specific MIM NOTE or Management Module Installation Guides and Local Management Guides for software configuration and operating information. System Specifications System specifications of the CRBRIM-W/E are listed in Table 2-1.

  • Page 16: Memory Configurations

    Memory Configurations Memory Configurations The CRBRIM-W/E has the following memory systems: • Primary memory (main memory)—Dynamic random-access memory (DRAM) that stores the running configuration and routing tables; mounted on the system card. • Shared memory—Shared DRAM that is used for packet buffering by the router network interfaces.

  • Page 17: Protocol Support

    CHAPTER 2: Product Overview Table 2-2 shows possible memory configurations for the CRBRIM-W/E. Table 2-2. Memory Configurations Memory Type Memory Capacity Primary memory (DRAM SIMMs) 1 MB (expandable to 4 or 16 MB) Shared (packet) memory 1 MB (DRAM on board) System-code memory (Flash or 4 MB (expandable) PROMs)
  • Page 18 Protocol Support The ENTERPRISE router software set provides all Cisco-supported LAN, WAN, and routing protocols as well as IBM features and protocol translator functionality. Supported LAN protocols include IP, Novell, IPX, DECnet IV, AppleTalk Phase 1 and 2, bridging, DECnet V, XNS, Banyon VINES, OSI, Apollo Domain, PUP, and CHAOSnet.

  • Page 19: Chapter 3 Preparing For Installation

    Chapter 3 Preparing for Installation This chapter describes the tasks you must perform before starting actual system installation. Sections of this chapter follow: • Preventing Electrostatic Discharge Damage • System Operation Prerequisites • Distance Limitations • Interference Considerations • Console Considerations •...

  • Page 20: System Operation Prerequisites

    CHAPTER 3: Preparing for Installation For safety, periodically check the resistance value of the antistatic strap, which should be within the range of 1 and 10 M . CAUTION System Operation Prerequisites The CRBRIM-W/E is designed to run system code from Flash memory single in- line memory modules (SIMMs).
  • Page 21 Distance Limitations Table 3-1. IEEE Standard RS-232 Transmission Speed Versus Distance Distance Distance Baud Rate (Feet) (Meters) 2400 4800 9600 19200 38400 RS-232 is often used in violation of these specifications. If you understand the electrical problems that can arise and can compensate for them, you might be able to get good results at CAUTION distances greater than those shown in Table 3-1;...

  • Page 22: Interference Considerations

    CHAPTER 3: Preparing for Installation Table 3-2. IEEE Standard RS-449 Transmission Speed Versus Distance Baud Distance Distance Rate (Feet) (Meters) 2400 4100 1250 4800 2050 9600 1025 19200 38400 56000 The RS-449 and V.35 interfaces support data rates up to 2.048 Mbps.

  • Page 23: Console Considerations

    Console Considerations If you have cables exceeding recommended distances, or if you have cables that pass between buildings, give special consideration to the effect of lightning strikes or ground loops. The electromagnetic pulse caused by lightning or other high- energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices.

  • Page 24: Serial Connections

    CHAPTER 3: Preparing for Installation 3.6.2 Serial Connections Two serial interface ports are located on the faceplate of the BRIM to the left of the console connector. The ports are labeled S0 and S1. The serial ports are 60-pin, D-type subconnectors. All serial interfaces except the EIA-530 can be configured as DCE, using a DCE cable.

  • Page 25: Chapter 4 Installation

    Chapter 4 Installation This chapter guides you through the installation of the CRBRIM-W/E and the associated EPIM-3PS and includes the following sections: • Tools and Parts Required • Installing the CRBRIM-W/E • Making External Connections Tools and Parts Required Following are the tools and parts required to install the CRBRIM-W/E: •...

  • Page 26: Installing The Crbrim-W/E

    CHAPTER 4: Installation Installing the CRBRIM-W/E This section contains procedures on how to install a CRBRIM-W/E. You can install a CRBRIM-W/E in any device that supports both BRIM and EPIM technology (e.g., EMM-E6, MicroMMAC, ESXMIM or the NBR-420/620), but, the CRBRIM-W/E and the EPIM-3PS must go into equivalent slots in order to be correctly recognized by local management.

  • Page 27: Installing A Crbrim-W/E Into A Mim

    Installing the CRBRIM-W/E 4.2.1 Installing a CRBRIM-W/E into a MIM To install a CRBRIM-W/E into a Media Interface Module (MIM) that supports BRIM and EPIM technology (e.g., EMM-E6): ESD senstive components! Observe the electrostatic discharge prevention procedures outlined in Chapter 3. CAUTION Power-down your MMAC hub.

  • Page 28: Installing The Epim-3Ps

    CHAPTER 4: Installation Figure 4-1. Installing the CRBRIM-W/E 4.2.2 Installing the EPIM-3PS To install the EPIM-3PS into a Media Interface Module (MIM): 1.) remove the mounting screw shown in Figure 4-2. When removing an EPIM, be sure to pull the module straight out to prevent damage to the connector.

  • Page 29: Connecting The Crbrim-W/E To The Epim-3Ps

    Installing the CRBRIM-W/E EMM-E6 RESET STBY ETHERNET Figure 4-2. EPIM-3PS Installation 4.2.3 Connecting the CRBRIM-W/E to the EPIM-3PS Following are the procedures for connecting the CRBRIM-W/E to the EPIM-3PS: 1.) Plug one end of the ethernet cable (part# 9372088) into the EPIM-3PS (Figure 4-3).

  • Page 30: Making External Connections

    CHAPTER 4: Installation EPIM-3PS Ethernet Cable DRAM SIMM Slot CRBRIM-W/E System (FLASH) SIMM Slot Figure 4-3. Connecting the CRBRIM-W/E to the EPIM-3PS Making External Connections Following are the procedures for making external connections to the CRBRIM-W/E with the following connectors: •...

  • Page 31: Chapter 5 Troubleshooting The Hardware

    Chapter 5 Troubleshooting the Hardware Configuration Your CRBRIM-W/E module went through extensive testing and burn-in before leaving the factory. However, if your system appears to have problems starting up, follow the steps in this chapter to help identify the problem. Sections of this chapter follow: •...

  • Page 32: Troubleshooting The Network Interfaces And Cables

    CHAPTER 5: Troubleshooting the Hardware Configuration When problem solving consider the following subsystems of the CRBRIM-W/E: • Network interfaces—The LEDs can be used to help identify a failure. For complete information on LED indicators, refer to the section “Reading LED Indicators.”...
  • Page 33 Problem Solving Table 5-1. CRBRIM-W/E LEDs COLOR DESCRIPTION LED ON indicates system is OK. LED OFF yellow indicates system failure. LED ON indicates power is on. LED OFF green indicates power is OFF. LED ON indicates LAN (Ethernet) is active. yellow LED OFF indicates no traffic on LAN.
  • Page 34 CHAPTER 5: Troubleshooting the Hardware Configuration Connection LED Figure 5-2. EPIM-3PS LED CRBRIM-W/E...

  • Page 35: Chapter 6 Maintenance

    Chapter 6 Maintenance This chapter contains information on maintenance procedures you might need to perform as your internetworking needs change. This chapter contains the following sections: • Installing Primary-Memory DRAM SIMMs • Replacing System-Code SIMMs • Recovering a Lost Password Installing Primary-Memory DRAM SIMMs The CRBRIM-W/E contains primary and shared (or packet) memory.

  • Page 36: Tools And Equipment Required

    CHAPTER 6: Maintenance 6.1.1 Tools and Equipment Required • ESD-preventive wrist strap • The appropriate DRAM SIMM for your CRBRIM-W/E model 6.1.2 Primary Memory Configurations You can upgrade to 4- or 16-MB DRAM: the 4-MB upgrade kit includes one 4 MB x 72 pin DRAM SIMM, and the 16 MB kit includes one 16 MB x 72 pin DRAM SIMM.

  • Page 37: Approved Dram Simms

    Installing Primary-Memory DRAM SIMMs 6.1.3 Approved DRAM SIMMs Following is an approved listing of 70 nanosecond (ns) DRAM SIMMs. Table 6-1. Approved DRAM SIMMs 4-MB Upgrade (4 MB, 16-MB Upgrade (16 MB, 70 ns DRAM SIMMs) 70 ns DRAM SIMMs) Manufacturer Part Manufacturer Manufacturer...
  • Page 38 CHAPTER 6: Maintenance DRAM SIMM Polarization Notch CRBRIM-W/E Faceplate SIMM Socket DRAM SIMM Installed Figure 6-2. Removing and Replacing the DRAM SIMM 4. Using the system board orientation shown in Figure 6-2 (top), position the new SIMM so that the polarization notch is located at the right end of the SIMM socket.

  • Page 39: Replacing System-Code Simms

    Replacing System-Code SIMMs Replacing System-Code SIMMs The system code (software) is stored on a Flash SIMM. The 80-pin Flash SIMM must be purchased from Cabletron. Contact a customer service representative for more information. 6.2.1 Tools and Equipment Required • ESD-preventive wrist strap •...
  • Page 40 CHAPTER 6: Maintenance System (FLASH) SIMM Polarization Notch CRBRIM-W/E Faceplate System SIMM Socket System SIMM Installed Figure 6-3. Removing and Replacing the System (FLASH) SIMM Using the system board orientation shown in Figure 6-3, position the new SIMM so that the polarization notch is located at the right end of the SIMM socket. Some Flash SIMMs have the components mounted on the rear side;...

  • Page 41: Recovering A Lost Password

    Recovering a Lost Password Connect the CRBRIM-W/E to a console terminal. If error messages relating to memory are displayed, repeat steps 1 through 9, taking care to firmly seat the SIMM in the socket. Recovering a Lost Password An overview of recovering a lost password follows: •...
  • Page 42 CHAPTER 6: Maintenance Enter the command show version to display the existing configuration register value. If Break is disabled, power cycle the CRBRIM-W/E. (Reset the MIM.) If Break is enabled on the CRBRIM-W/E, send a Break and then proceed to step Within 60 seconds of resetting the MIM, press the Break key.
  • Page 43 Recovering a Lost Password 12. Enter the configure terminal command at the EXEC prompt. You are prompted as follows: Router (boot)# configure Configuring from terminal, memory, or network [terminal]? <cr> Enter Configuration commands, one per line. Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z 13.
  • Page 44 Appendix A Cabling Specifications This appendix provides pinouts for the following: • Console asynchronous serial, Table A-1, page A-2 • EIA-530 synchronous serial DTE, Table A-2, page A-3 • RS-232 synchronous serial DTE, Table A-3, page A-5 • RS-232 synchronous serial DCE, Table A-4, page A-7 •...

  • Page 45: Appendix A Cabling Specifications

    Appendix A: Cabling Specifications A.1 Console Port Signals and Pinouts The console port is configured as data communications equipment (DCE). The console uses RJ-45 connectors. RJ-45 to DB-25 adapters are available for connection to modems and other external communications equipment. Following are the pinouts for the console port and adapter (see Table A-1): Table A-1.

  • Page 46: Serial Cable Assemblies And Pinouts

    Serial Cable Assemblies and Pinouts A.2 Serial Cable Assemblies and Pinouts The following illustrations and tables provide assembly drawings and pinouts for the EIA-530 DCE, and RS-232, RS-449, V.35, and X.21 DTE and DCE cables. A.2.1 EIA-530 Figure A-1 shows the EIA-530 serial cable assembly, and Table A-2 lists the pinouts.
  • Page 47 Appendix A: Cabling Specifications Table A-2. EIA-530 DTE Cable Pinout (DB-60 to DB-25) Direc- Direc- tion tion 60 Pin Signal 25 Pin Signal 60 Pin Signal 25 Pin Signal J1-11 TxD/ J2-2 BA(A), —> J1-5 DCD/ J2-8 CF(A), <— J1-12 RxD+ J2-14 TxD+...

  • Page 48: Rs-232

    Serial Cable Assemblies and Pinouts A.2.2 RS-232 Figure A-2 shows the RS-232 cable assembly; Table A-3 lists the DTE pinout; and Table A-4 lists the DCE pinout. Arrows indicate signal direction: —> indicates DTE to DCE, and <— indicates DCE to DTE. J1-46 60-pin connector 25-pin connector...
  • Page 49 Appendix A: Cabling Specifications Table A-3. RS-232 DTE Cable Pinout (DB-60 to DB-25) (Continued) 60 Pin Signal Note Direction 25 Pin Signal J1-35 CTS/RTS Twisted pair no. 10 <— J2-5 Shield – – Shield – J1-34 DSR/DTR Twisted pair no. 11 <—...

  • Page 50: Hardware Installation Guide

    Serial Cable Assemblies and Pinouts Table A-4. RS-232 DCE Cable Pinout (DB-60 to DB-25) 60 Pin Signal Note Direction 25 Pin Signal J1-50 MODE_0 Shorting – – – J1-51 Group J1-46 Shield GND Single – J2-1 Shield GND J1-36 RxD/TxD Twisted pair no.

  • Page 51: Rs-449

    Appendix A: Cabling Specifications A.2.3 RS-449 Figure A-3 shows the RS-449 cable assembly; Table A-5 lists the DTE pinout; Table A-8 lists the DCE pinout. Arrows indicate signal direction: —> indicates DTE to DCE, and <— indicates DCE to DTE. 60-pin connector (J1) J1-46 37-pin connector (J2)
  • Page 52 Serial Cable Assemblies and Pinouts Table A-5. RS-449 DTE Cable Pinout (DB-60 to DB-37) (Continued) Signal Note Direction 37 Pin Signal J1-28 RxD/TxD+ Twisted pair no. 11 <— J2-6 J1-27 RxD/TxD– <— J2-24 RD– J1-9 RTS/CTS+ Twisted pair no. 5 —>...
  • Page 53 Appendix A: Cabling Specifications Table A-6. RS-449 DCE Cable Pinout (DB-60 to DB-37) Signal Note Direction 37 Pin Signal J1-49 MODE_1 Shorting group – – – J1-48 J1-46 Shield_GND Single – J2-1 Shield GND J1-28 RxD/TxD+ Twisted pair no. 11 <—...

  • Page 54: V.35

    Serial Cable Assemblies and Pinouts A.2.4 V.35 Figure A-4 shows the V.35 cable assembly; Table A-7 lists the DTE pinout; Table A-8 lists the DCE pinout. Arrows indicate signal direction: —> indicates DTE to DCE, and <— indicates DCE to DTE. 60-pin connector (J1) 15-pin connector (J2) J1-46...
  • Page 55 Appendix A: Cabling Specifications Table A-7. V.35 DTE Cable Pinout (DB-60 to Winchester-Type 34 Pin) 60 Pin Signal Note Direction 34 Pin Signal Circuit_GND J1-45 Twisted pair no. 12 – J2-B Circuit GND Shield – – Shield – J1-42 RTS/CTS Twisted pair no.
  • Page 56 Serial Cable Assemblies and Pinouts Table A-8. V.35 DCE Cable Pinout (DB-60 to Winchester-Type 34 Pin) 60 Pin Signal Note Direction 34 Pin Signal J1-49 MODE_1 Shorting Group – – – J1-48 J1-50 MODE_0 Shorting Group – – – J1-51 J1-53 TxC/NIL Shorting Group...

  • Page 57: X.21

    Appendix A: Cabling Specifications Table A-8. V.35 DCE Cable Pinout (DB-60 to Winchester-Type 34 Pin) (Continued) 60 Pin Signal Note Direction 34 Pin Signal J1-22 NIL/RxC+ Twisted pair no. 3 —> J2-V SCR+ J1-21 NIL/RxC– —> J2-X SCR– J1-20 TxCE/TxC+ Twisted pair no.
  • Page 58 Serial Cable Assemblies and Pinouts Table A-9. X.21 DTE Cable Pinout (DB-60 to DB-15) 60 Pin Signal Note Direction 15 Pin Signal J1-48 Shorting Group – – J1-47 MODE_2 J1-51 Shorting Group – – – J1-52 MODE_DCE J1-46 Shield_GND Single –...
  • Page 59 Appendix A: Cabling Specifications Table A-10. X.21 DCE Cable Pinout (DB-60 to DB-15) 60 Pin Signal Note Direction 15 Pin Signal J1-48 Shorting Group – – – J1-47 MODE_2 J1-46 Shield_GND Single – J2-1 Shield GND J1-28 RxD/TxD+ Twisted pair no. 6 <—...

  • Page 60: Appendix B Virtual Configuration Register

    Appendix B Virtual Configuration Register This appendix describes the CRBRIM-W/E virtual configuration register, the factory default settings, and procedures for changing settings. Following is the information included in this appendix: • Virtual configuration register settings • Explanation of boot field •...
  • Page 61 Appendix B: Virtual Configuration Register To avoid possibly hanging the CRBRIM-W/E, remember that valid configuration register settings might be combinations of settings and not just the individual settings listed in Table B-1. For CAUTION example, the factory default value of 0x2102 is a combination of settings.

  • Page 62: Changing Configuration Register Settings

    Virtual Configuration Register Settings Table B-2. Explanation of Boot Field (Configuration Register Bits 00 to 03) Boot Meaning Field Stays at the system bootstrap prompt Boots system image in system ROM 02 to 0F Specifies a default netboot filename Enables boot system commands that override default netboot filename B.1.1 Changing Configuration Register Settings Some common reasons to modify the value of the virtual configuration register...
  • Page 63 Appendix B: Virtual Configuration Register Enter the enable command and your password to enter the privileged level, as follows: Router> enable Password: Router# At the privileged-level system prompt (CRBRIM-W/E #), enter the command You will be prompted as shown in the following example: configure terminal.

  • Page 64: Virtual Configuration Register Bit Meanings

    Virtual Configuration Register Settings B.1.2 Virtual Configuration Register Bit Meanings The lowest four bits of the virtual configuration register (bits 3, 2, 1, and 0) form the boot field. (See Table B-2.) The boot field specifies a number in binary. If you set the boot field value to 0, you must boot the operating system manually by entering the b command at the bootstrap prompt as follows: >...
  • Page 65 Appendix B: Virtual Configuration Register A boot system command in the router configuration in NVRAM NOTES overrides the default netboot filename. Table B-3. Default Boot Filenames Action/File Name Bit 3 Bit 2 Bit 1 Bit 0 bootstrap mode ROM software cisco2-igs cisco3-igs cisco4-igs...
  • Page 66 Virtual Configuration Register Settings Bit 8 controls the console Break key. Setting bit 8 (the factory default) causes the processor to ignore the console Break key. Clearing bit 8 causes the processor to interpret the Break key as a command to force the system into the bootstrap monitor, thereby halting normal operation.

  • Page 67: Enabling Booting From Flash

    Appendix B: Virtual Configuration Register Bit 13 determines the server response to a bootload failure. Setting bit 13 causes the server to load operating software from ROM after five unsuccessful attempts to load a boot file from the network. Clearing bit 13 causes the server to continue attempting to load a boot file from the network indefinitely.

  • Page 68: Appendix C Bootstrap Program

    Appendix C Bootstrap Program The bootstrap program can help you isolate or rule out hardware problems encountered when installing your router. A summary of the bootstrap diagnostic tests and command options is provided. C.1 Entering the Bootstrap Program The bootstrap diagnostics help initialize the processor hardware and boot the main operating system software.

  • Page 69: Available Bootstrap Commands

    Appendix C: Bootstrap Program The new configuration register value, 0x0, takes effect after the router is rebooted. If you set the configuration to 0x0, you will have to manually boot the system each time you reboot the router. Break (system interrupt) is always enabled for 60 seconds after rebooting the system, even if break is configured to be off by setting the configuration register.
  • Page 70 Entering the Bootstrap Program The following system bootstrap commands are among the most useful: • Boot—The b command with no argument reboots the system and boots the default software from ROM as defined by the lower four bits of the configuration register which form the boot field.
  • Page 71 Appendix C: Bootstrap Program • To reset, enter the following at the > prompt: Table C-1 lists additional o command options. Table C-1. o Command Options Monitor Function Command Displays the virtual configuration register, currently in effect, with a description of the bits Resets the virtual configuration register as follows: 9600 baud console UART speed Break/abort has no effect...

  • Page 72: Running The Diagnostics

    Entering the Bootstrap Program To test memory, enter the t command with the m option at the > prompt, as follows: To use the default addresses and select the default tests, press the Return key after each prompt displayed. The time taken to run a diagnostic is memory-size dependent, but will require a minimum of ten minutes.

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