Users Guide

• Kernel full core dump from LP application
f10Ch<Chassis ID>_lp<slot#>_<timestamp>.kcore.gz
Enabling TCP Dumps
A TCP dump captures CPU-bound control-plane traffic to improve troubleshooting and system
manageability. You can perform a TCP dump on the Control Processor (CP) and Route Processor (RP)
CPUs.
When you enable TCP dumps, a dump captures all the packets on the local CPU, as specified in the CLI.
You can save the traffic capture files to flash, to FTP, SCP, or TFTP. The files saved on the flash are located
in the flash://TCP_DUMP_DIR/tcpdump_<time_stamp_dir>/ directory and are labeled tcpdump_*.pcap.
There can be up to 20 tcpdump_<time_stamp_dir> directories. The file after 20 overwrites the oldest
saved file. The maximum file size for a TCP dump capture is 1MB. When a file reaches 1MB, a new file is
created, up to the specified total number of files.
Maximize the number of packets recorded in a file by specifying the snap-length to capture the file
headers only.
The tcpdump command has a finite run process. When you enable the command, it runs until the
capture-duration timer and/or the packet-count counter threshold is met. If you do not set a threshold,
the system uses a default of 5 minute capture-duration and/or a single 1k file as the stopping point for
the dump.
You can use the capture-duration timer and the packet-count counter at the same time. The TCP dump
stops when the first of the thresholds are met. That means that even if the duration timer is 9000
seconds, if the maximum file count parameter is met first, the dumps stop.
• Enable a TCP dump for CPU bound traffic.
CONFIGURATION mode
tcpdump {cp | rp} [capture-duration time | filter expression | max-file-count
value | packet-count value | snap-length value | write-to path]
Accessing Port Extender Core and Mini Core Dumps
For port extenders (PE), the application core dump and the mini core dump of the port extenders are
uploaded to the controller bridge’s flash inside directory /flash/CORE_DUMP_DIR.
The format of a PE application core uploaded to CB are as follows:
f10pe<PEID#>_<Process Name>_<timestamp>_Stk<slot#>.acore.gz
The format for a mini core dump uploaded to CB are as follows:
f10pe<PEID#>_ StkUnit<slot#>_<timestamp>.kcore.mini.txt
Debugging and Diagnostics
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