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Chapter 2
Determining the Scope of a Problem
Chapter 3
Troubleshooting an Operational Problem
Damaged Router ............................................................................................................3-2
Power Problem ...............................................................................................................3-2
Blown Fuse .....................................................................................................................3-2
LEDs Are Off ..................................................................................................................3-3
Router Won’t Boot ..........................................................................................................3-3
Checking the Boot PROMs .............................................................................................3-6
Making Sure the Router Software Image Is Correct .......................................................3-6
Making Sure All Slots Use the Same Router Software Image and Configuration File ....3-6
Verifying That the Router Software Images in Each Processor Match ....................3-7
Verifying That the Configuration Files in Each Processor Match .............................3-9
Lost Password (BN Routers) ........................................................................................3-10
No Space Left on Memory Card ...................................................................................3-11
Memory or Buffer Problem ...........................................................................................3-12
Bad Forward Receive Buffer Checksum Errors ............................................................3-17
Finding the Slot That Sent a Bad Backplane BofL Packet .....................................3-18
Finding the Slot That Sent a Bad Packet That Was Not a BofL Packet ..................3-19
Fault Message ..............................................................................................................3-20
Chapter 4
Troubleshooting a Physical Media Problem
Making Sure the Link Module Is Working .......................................................................4-1
Determining the Media-Specific State ............................................................................4-1
Troubleshooting the Cable Connection ...........................................................................4-3
Chapter 5
Troubleshooting a Data Link Layer Problem
Troubleshooting an ATM Connection ..............................................................................5-2
Interface Problems ...................................................................................................5-2
Dropped Frames ................................................................................................5-5
ATM VC Mod Failed Message ...........................................................................5-5
Upper-Layer Protocols Failing to Pass Packets .................................................5-6
PVC Problems ...................................................................................................5-7
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