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 | Caution Use the commands discussed in this appendix only in coordination with a qualified technical support representative. The resulting binary file must be directed to a specific syslog server and subsequently interpreted by qualified technical personnel. |
When the router crashes, it can be very useful to obtain a a full copy of the memory image (core dump) to analyze the cause of the crash. Core dumps generally are only useful to your router technical support representative.
To obtain a core dump, use the exception dump IP-address global configuration command. IP-address is the address of your TFTP server. The core dump is written to a file named hostname-core on your TFTP server, where hostname is the name of the router, as assigned using the hostname global configuration command. Using this command causes the router to attempt to make a core dump when it crashes.
This procedure cannot be guaranteed to work. It can fail if the system crash is serious. If successful, the core dump file will be the size of the memory available on the processor (for example, 4 Mbytes for a CSC/3).
Depending on your TFTP server, you may need to create a target file before the router can write to it. You can test this by attempting to use the TFTP put command from a workstation.
You also can test core dumps by using the EXEC command write core. This command causes the router to generate a dump and is useful if the router is malfunctioning but has not crashed.
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