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Troubleshooting Routers
1-4 117379-A Rev. A
Handling Flash Memory Cards to Prevent Static Damage
Always use an antistatic wrist strap when handling flash memory cards; static
electricity can damage them.
Responding to a Failed prom Command
If you reboot after the prom command fails, a Bay Networks representative must
insert new PROM (programmable read-only memory) components on the router
baseboard and write new PROM software to them before the router can recover.
Preparing to Troubleshoot
The following sections describe how to prepare to troubleshoot router problems:
• “Getting Acquainted with the Troubleshooting Tools”
• “T
aking a Snapshot of Your Network”
Getting Acquainted with the Troubleshooting Tools
Troubleshooting is much more complicated when you have to solve a problem
that requires an urgent solution, and at the same time learn how to use the tools to
solve the problem. Read this section and familiarize yourself with the tools before
you begin troubleshooting. The instructions later in this guide assume you can use
the tools described in this section.
Read the following sections:
• “Using the System Lo
g to Display Event Messages”
• “Displa
ying and Changing Configuration Settings and Statistics”
• “Using the ping Command
”
• “Using the P
acket Capture Tool”
• “Using Inbound
Telnet to Access the Technician Interface”
Caution: If the Technician Interface prom command fails, do not reboot.
Instead, call the Bay Networks Technical Solutions Center.
- Troubleshooting Routers 1
- Contents 5
- 117379-A Rev. A 10
- About This Guide 15
- Before You Begin 16
- Conventions 17
- Acronyms 18
- Bay Networks Customer Service 23
- How to Get Help 23
- Chapter 1 25
- Introduction 25
- Caution: 26
- Backing Up Your Files 27
- Preparing to Troubleshoot 28
- Filtering Event Messages 30
- 1-8 117379-A Rev. A 32
- 1-10 117379-A Rev. A 34
- 1-12 117379-A Rev. A 36
- • get 1.3.10.Pleasant.Easton 36
- <object> 37
- <attribute> 41
- Unknown Network or Network 44
- Unreachable 44
- <volume> 46
- Documenting Each Step 47
- 1-24 117379-A Rev. A 48
- Chapter 2 49
- 117379-A Rev. A 2-3 51
- Chapter 3 53
- Damaged Router 54
- Power Problem 54
- Blown Fuse 54
- LEDs Are Off 55
- Router Won’t Boot 55
- TRB0001A 57
- Checking the Boot PROMs 58
- Example 59
- Lost Password (BN Routers) 62
- No Space Left on Memory Card 63
- Memory or Buffer Problem 64
- 3-16 117379-A Rev. A 68
- TRB0002A 69
- TRB0005A 71
- Fault Message 72
- Chapter 4 73
- 4-2 117379-A Rev. A 74
- 117379-A Rev. A 4-3 75
- 117379-A Rev. A 4-5 77
- Chapter 5 79
- Interface Problems 80
- 5-4 117379-A Rev. A 82
- Troubleshooting ATM LANE 85
- 5-8 117379-A Rev. A 86
- 5-10 117379-A Rev. A 88
- 117379-A Rev. A 5-11 89
- 117379-A Rev. A 5-13 91
- 117379-A Rev. A 5-19 97
- <slot_no.> 100
- <slot> 101
- 117379-A Rev. A 5-25 103
- <connector_no.> 104
- <setting> 104
- <instance> 106
- <ENTITY> 107
- 5-30 117379-A Rev. A 108
- Chapter 6 109
- Troubleshooting AppleTalk 110
- 117379-A Rev. A 6-3 111
- Troubleshooting DLSw 112
- 117379-A Rev. A 6-5 113
- Troubleshooting IP 114
- <TELNET 116
- Ping Does Not Work 117
- <slot_no.> 119
- Network Unreachable Message 120
- Host Did Not Respond Message 120
- TRB0006A 121
- Troubleshooting RIP 122
- Troubleshooting OSPF 123
- Troubleshooting IPX 124
- 6-18 117379-A Rev. A 126
- <destination_address> 127
- <service_name> 128
- Troubleshooting OSI 129
- 117379-A Rev. A 6-25 133
- 6-26 117379-A Rev. A 134
- 117379-A Rev. A 6-29 137
- 117379-A Rev. A 6-31 139
- Chapter 7 141
- 117379-A Rev. A 7-3 143
- <community index> 146
- <IP address> 146
- (continued) 146
- 117379-A Rev. A 7-7 147
- <pathname> 149
- Chapter 8 151
- Getting Help 151
- Sending and Retrieving Files 153
- <filename> 154
- Appendix A 155
- Reading the Event Log 155
- System Startup 156
- A-4 117379-A Rev. A 158
- A-6 117379-A Rev. A 160
- A-8 117379-A Rev. A 162
- A-10 117379-A Rev. A 164
- A-12 117379-A Rev. A 166
- A-14 117379-A Rev. A 168
- A-16 117379-A Rev. A 170
- Dial-on-Demand Raise DTR Log 171
- A-18 117379-A Rev. A 172
- A-20 117379-A Rev. A 174
- Dial-on-Demand V.25bis 176
- A-24 117379-A Rev. A 178
- A-26 117379-A Rev. A 180
- A-28 117379-A Rev. A 182
- A-30 117379-A Rev. A 184
- A-32 117379-A Rev. A 186
- A-34 117379-A Rev. A 188
- A-36 117379-A Rev. A 190
- Appendix B 193
- Run Packet Capture 193
- Overview 194
- 117379-A Rev. A B-3 195
- Implementation Notes 196
- Getting Started 197
- B-6 117379-A Rev. A 198
- Creating an Instance for MCT1 199
- 10902101 200
- 117379-A Rev. A B-9 201
- Example 1 202
- Example 2 202
- <line_no.> 203
- <value> 203
- Starting Packet Capture 205
- Terminating Packet Capture 205
- Capture file: 208
- Example 4 209
- Using Optional Features 210
- Assigning Filters 213
- <attribute_no.> 214
- Specifying the Reference 216
- Specifying the Offset 217
- Configuration Examples 219
- Example 3 220
- Example 5 221
- Settings 222
- <IP_address> 225
- B-36 117379-A Rev. A 228
- Examples 229
- B-38 117379-A Rev. A 230
- 232
- 233
- 234
- <slot no.> 235
- 236
- B-46 117379-A Rev. A 238
- B-48 117379-A Rev. A 240
- B-50 117379-A Rev. A 242
- 243
- B-52 117379-A Rev. A 244
- Bisynchronous 245
- Frame Relay 245
- Passthru 246
- Standard PPP 246
- Bay Networks Proprietary PPP 246
- B-56 117379-A Rev. A 248
- B-58 117379-A Rev. A 250
- Appendix C 251
- Packet Configuration 251
- Using the Line Subcommand 252
- Packet Configuration 253
- C-4 117379-A Rev. A 254
- Using the Load Subcommand 255
- Using the Unload Subcommand 255
- 117379-A Rev. A Index-1 257
- 117379-A Rev. A Index-3 259
- 117379-A Rev. A Index-5 261
- Packet Size, B-12, B-44 262
- 117379-A Rev. A Index-7 263
- B-47, B-48 265
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