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Troubleshooting a Data Link Layer Problem
308656-14.00 Rev 00
5-27
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 the Internal Clock Settings (Lab Environments Only)
If you are using crossover cables to connect to two back-to-back routers in a lab
environment, make sure all interfaces on a given slot have consistent clock source
and speed settings. A message such as the following appears if two interfaces on a
slot have inconsistent clock settings:
Warning Sync Code: 40 “Connector COM2: clock speed does not match
other ports.”
Check the clock source and speed settings as follows:
1.
Enter the following command to display the clock source setting for each
slot and connector in the router:
get wfSyncEntry.13.*
Note:
All internally clocked ports on a slot change to the last configured
internal clock speed when you boot, save a dynamic configuration change, or
enter the
config
command.
- Troubleshooting Routers 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308656-14.00 Rev 00 10
- Before You Begin 15
- Text Conventions 16
- Acronyms 17
- Hard-Copy Technical Manuals 23
- How to Get Help 23
- Chapter 1 25
- Introduction 25
- Backing Up Your Files 27
- Preparing to Troubleshoot 28
- Filtering Event Messages 30
- • get 1.3.10.Pleasant.Easton 36
- <object> 37
- <attribute> 41
- <volume> 46
- Documenting Each Step 47
- Chapter 2 49
- 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
- TRB0002A 69
- TRB0005A 71
- Fault Message 72
- Chapter 4 73
- Chapter 5 79
- Interface Problems 80
- Troubleshooting ATM LANE 85
- , and take the 86
- <slot_no.> 100
- <slot> 102
- Caution: 104
- <instance> 107
- <ENTITY> 108
- Chapter 6 111
- Troubleshooting AppleTalk 112
- Troubleshooting DLSw 114
- Troubleshooting IP 116
- <TELNET 118
- Ping Does Not Work 119
- <slot_no.> 120
- Network Unreachable Message 121
- Host Did Not Respond Message 122
- TRB0006A 123
- Troubleshooting RIP 124
- Troubleshooting OSPF 125
- Troubleshooting IPX 126
- <destination_address> 129
- <service_name> 130
- Troubleshooting OSI 131
- Chapter 7 143
- (continued) 148
- <pathname> 151
- Chapter 8 153
- Getting Help 153
- Sending and Retrieving Files 155
- <filename> 156
- Appendix A 157
- Reading the Event Log 157
- System Startup 158
- Dial-on-Demand Raise DTR Log 174
- Dial-on-Demand V.25bis 179
- Appendix B 195
- Overview 196
- Implementation Notes 198
- Getting Started 199
- Creating an Instance for MCT1 201
- Example 1 204
- Example 2 204
- <line_no.> 205
- <value> 205
- Starting Packet Capture 207
- Terminating Packet Capture 207
- Capture file: 210
- Example 4 211
- Using Optional Features 212
- Assigning Filters 215
- <attribute_no.> 216
- Specifying the Reference 218
- Specifying the Offset 219
- Configuration Examples 221
- Example 3 222
- Example 5 223
- Settings 224
- <IP_address> 227
- Examples 231
- <slot no.> 237
- Bisynchronous 247
- Frame Relay 247
- Passthru 248
- Standard PPP 248
- Appendix C 253
- Packet Configuration 253
- Using the Line Subcommand 254
- Using the Load Subcommand 257
- Using the Unload Subcommand 257
- B-21, B-25, B-48 264
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