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Troubleshooting a Data Link Layer Problem
117379-A Rev. A 5-25
If transmission and reception statistics increment equally without errors, conduct
a loopback test of the remote CSU/DSU if at least one of the following is true:
• You configured the synchronous line as standard with explicit addressing.
• You configured the data terminal equipment/data communications equipment
(DTE/DCE) with promiscuous mode turned on.
The remote loopback test allows data to leave the router, cross the synchronous
circuit to the remote CSU/DSU, and return to the router.
If the transmission and reception statistics increment without errors, perform the
local and remote loopback tests on the remote side.
If the local loopback test did not cause any error count to be incremented, but the
remote loopback test did, request that the carrier test the line and remote
CSU/DSU.
If the local loopback test causes the error counts to continue to increment,
complete one of the following procedures to isolate the problem:
• Disconnect the cable from the port of the router reporting the errors and plug
it into another port on the router you know works correctly.
If the synchronous errors persist, verify that you properly configured the
newly tested port, test the cable, and test the local CSU/DSU.
If the errors stop, compare the newly tested port’s configuration with that of
the original port. If the port configurations are the same, try swapping the link
module with a new link module.
• Connect the port of the router reporting the errors to another CSU/DSU and
monitor the line statistics.
If the errors persist, try another cable or try swapping the link module with a
new link module.
- 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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