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APPENDIX
Cisco 4000 Series Virtual Configuration Register D-1
D
Cisco 4000 Series Virtual
Configuration Register
This appendix describes the Cisco 4000 series virtual configuration register, the
factory-default settings, and the procedures for changing those settings.
Virtual Configuration Register Settings
The Cisco 4000 series has a 16-bit virtual register, which is written into the nonvolatile
random access memory (NVRAM). Use the processor configuration register information
contained in this appendix to do the following:
• Set and display the configuration register value
• Force the system into the bootstrap program
• Select a boot source and default boot filename
• Enable or disable the Break function
• Control broadcast addresses
• Set the console terminal baud rate
• Load operating software from ROM
• Enable booting from a Trivial File Transfer Protocol (TFTP) server
Table D-1 lists the meaning of each of the virtual configuration memory bits.
- About This Guide 1
- Document Organization 2
- Document Conventions 3
- Overview of the Cisco 4000 5
- Series Routers 5
- Series Specifications 8
- Software Compatibility 10
- Series Specifications 12
- Memory Systems 13
- Shared Memory Requirements 15
- Main Memory Requirements 17
- Cisco RPS Support 18
- Overview 19
- Fully Redundant Power 20
- RPS Features 21
- Preparing to Install 23
- Cisco 4000 Series Routers 23
- Safety with Electricity 24
- Safety Recommendations 25
- General Site Requirements 26
- Site Configuration Precautions 27
- Equipment Racks 28
- Power Supply Features 28
- Installation Checklist 29
- Site Log 30
- Required Tools and Equipment 30
- Inspecting the System 31
- • This publication 32
- • Cisco Information Packet 32
- Configuring the Cisco 4000 33
- Series Chassis 33
- Removing the Component Tray 34
- Replacing the Component Tray 41
- Making External Connections 43
- Unit Numbering 44
- AUX CONSOLE 46
- Use of the Slot Filler Panel 47
- Considerations 48
- Console Port Connections 49
- Auxiliary Port Connections 49
- Ethernet Connections 50
- Connectors 51
- Connection 52
- ETHERNET AUI 54
- Six-Port Ethernet Module 55
- Token Ring Connections 56
- IN-RING A 57
- IN-RING B 57
- Serial Connections 59
- EIA/TIA-232 Connections 60
- EIA/TIA-449 Connections 61
- V.35 Connections 62
- X.21 Connections 62
- EIA-530 Connections 63
- Interference Considerations 63
- Configuring Serial Connections 64
- Router connections 66
- EIA/TIA-449 V.35 X.21 66
- EIA/TIA-232 EIA-530 66
- G.703/G.704 Cable Connections 72
- • Multimode dual-attachment 74
- • Multimode single-attachment 74
- • Single-mode dual-attachment 74
- Connectors—End View 76
- CLASS 1 LASER PRODUCT 77
- LASERKLASSE 1 77
- OPT-BYPASS 79
- 87654321 81
- 1. kHz = kilohertz 82
- 2. nF = nanoFarad 82
- LOOPBACK 83
- LOCAL ALARM 83
- REMOTE ALARM 83
- T1 Cabling 84
- E1 Cabling 87
- ATM Connections 88
- XMTR RCVR 89
- RX ALARM 89
- RX CELLSBUSY 89
- RX CELLS 90
- ATM Cabling 91
- Figure 4-54 ST2 Connector 92
- Simplex (2) 94
- Duplex (1) 94
- BNC to RCVR 94
- BNC to XMTR 94
- Power Budget 97
- 500 MHz/km 98
- Single-Mode Transmission 101
- For Further Reference 102
- AC power supply 103
- DC power supply 104
- Terminal block cover 104
- Powering Up the Router 107
- Software Configuration 109
- Configuring the Router 111
- Configuring the Router 112
- Software Configuration 5-5 113
- Software Configuration 5-9 117
- Additional Configuration Tasks 118
- Software Configuration 5-11 119
- Configuring the T1 Interface 121
- Configuring the E1 Interface 123
- • Network protocol addresses 126
- Software Configuration 5-23 131
- Software Configuration 5-25 133
- Router# config terminal 134
- Router(config)# 134
- Router(config-if)# 134
- Router# disable 136
- Router> 136
- Software Configuration 5-29 137
- Software Configuration 5-31 139
- If You Need More Information 140
- Cabling Specifications 141
- 1. GND = Ground 143
- 2. CD = Carrier Detect 143
- Serial Cables 145
- <— indicates DCE to DTE 165
- DCE to DTE 172
- E1-G.703/G.704 Cable Pinouts 214
- HSSI Cable Pinouts 215
- HSSI Null- Modem Cable 216
- Ethernet Cable Pinouts 218
- 10BaseT Connector Pinouts 219
- 100BaseT Connector Pinouts 220
- 8 7 6 5 4 3 2 1 221
- Jackscrew Pin 21 223
- Token Ring Port Pinouts 225
- BRI Pinouts 226
- Channelized T1 Pinouts 227
- Channelized E1 Pinouts 228
- Replacing Memory in 233
- Replacing Main Memory SIMMs 236
- Removing Main Memory SIMMS 237
- Top view 238
- Front of the chassis 238
- Side view 238
- Installing Main Memory SIMMs 239
- Replacing Shared-Memory SIMMs 241
- Side view, SIMM inserted 243
- Helper Flash Memory SIMM 244
- Polarization notch 245
- System-code SIMM card 245
- Installing Flash-Memory SIMMs 246
- Figure C-9 Boot ROM Locations 249
- Cisco 4000 Series Virtual 251
- Configuration Register 251
- • Recover a lost password 252
- Configuring the Boot Field 254
- Cisco 4000-M ROM Monitor 259
- Cisco 4000-M ROM Monitor E-3 261
- > t m 262
- Running the Diagnostics 263
- Cisco 4500-M and 265
- Cisco 4700-M ROM Monitor 265
- Debugging Commands 268
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