Enabling Tcp Dumps - Dell S4048–ON Configuration Manual

When a member or standby unit crashes, the mini core file gets uploaded to master unit. When the master unit crashes, the mini
core file is uploaded to new master.
The panic string contains key information regarding the crash. Several panic string types exist, and they are displayed in regular
English text to enable easier understanding of the crash cause.
Example of Application Mini Core Dump Listings
Dell#dir
Directory of flash:
1 drw- 16384 Jan 01 1980 00:00:00 +00:00 .
2 drwx 1536 Sep 03 2009 16:51:02 +00:00 ..
3 drw- 512 Aug 07 2009 13:05:58 +00:00 TRACE_LOG_DIR
4 d--- 512 Aug 07 2009 13:06:00 +00:00 ADMIN_DIR
5 -rw- 8693 Sep 03 2009 16:50:56 +00:00 startup-config
6 -rw- 8693 Sep 03 2009 16:44:22 +00:00 startup-config.bak
7 -rw- 156 Aug 28 2009 16:16:10 +00:00 f10StkUnit0.mrtm.acore.mini.txt
8 -rw- 156 Aug 28 2009 17:17:24 +00:00 f10StkUnit0.vrrp.acore.mini.txt
9 -rw- 156 Aug 28 2009 18:25:18 +00:00 f10StkUnit0.sysd.acore.mini.txt
10 -rw- 156 Aug 28 2009 19:07:36 +00:00 f10StkUnit0.frrp.acore.mini.txt
11 -rw- 156 Aug 31 2009 16:18:50 +00:00 f10StkUnit2.sysd.acore.mini.txt
12 -rw- 156 Aug 29 2009 14:28:34 +00:00 f10StkUnit0.ipm1.acore.mini.txt
13 -rw- 156 Aug 31 2009 16:14:56 +00:00 f10StkUnit0.acl.acore.mini.txt
flash: 3104256 bytes total (2959872 bytes free)
Dell#
Example of a Mini Core Text File
VALID MAGIC
-----------------PANIC STRING -----------------
panic string is :<null>
---------------STACK TRACE START---------------
0035d60c <f10_save_mmu+0x120>:
00274f8c <panic+0x144>:
0024e2b0 <db_fncall+0x134>:
0024dee8 <db_command+0x258>:
0024d9c4 <db_command_loop+0xc4>:
002522b0 <db_trap+0x158>:
0026a8d0 <mi_switch+0x1b0>:
0026a00c <bpendtsleep>:
----------------STACK TRACE END----------------
--------------------FREE MEMORY---------------
uvmexp.free = 0x2312

Enabling TCP Dumps

A TCP dump captures CPU-bound control plane traffic to improve troubleshooting and system manageability. When you enable TCP
dump, it captures all the packets on the local CPU, as specified in the CLI.
You can save the traffic capture files to flash, FTP, SCP, or TFTP. The files saved on the flash are located in the flash://
TCP_DUMP_DIR/Tcpdump_<time_stamp_dir>/ directory and labeled tcpdump_*.pcap. There can be up to 20
Tcpdump_<time_stamp_dir> directories. The 21st file 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 tcpdump 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 a 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 is met. That means that even if the duration timer is 9000 seconds, if the maximum file count parameter is met first, the
dumps stop.
Debugging and Diagnostics
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