The switch system periodically saves the information from the log buffer to a user log file (log.log) and a diagnostic log file (log.dblg), which are saved in the logfile folder. When the two log files exceed the specified size, the system compresses them into zip packages and names the compressed files date time.log.zip and date time.dblg.zip, for example, 2013-08-14.04-55-23.log.zip and 2013-09-05.05-15-23.dblg.zip.

When a device is encountering a failure an important practice is to collect the logs and alarms which can help us know what happened during device operation and where the fault occurred.

Example:

<R6_U29_S5720>dir                                                                                                                  

Directory of flash:/logfile/                                                                                                                                                                                                                          

  Idx  Attr     Size(Byte)  Date        Time       FileName                                                                         

    2  -rw-         29,429  Jun 17 2016 02:39:11   2016-06-16.22-39-08.dblg.zip                                                    

    4  -rw-      6,339,752  Aug 10 2016 14:20:02   log.log                                                                          

    5  -rw-        408,919  Jun 17 2016 00:39:17   2016-06-16.22-18-01.dblg.zip                                                    

    6  -rw-        921,090  Aug 11 2016 10:50:21   2016-08-11.10-50-06.dblg.zip                                                     

   10  -rw-         33,508  Aug 11 2016 10:50:22   log.dblg

<?xml:namespace prefix = "o" />

In a SVF system, the log information collected from the parent might not be sufficient to identify problems that appear on the AS and we would need to also obtain these logs from the AS itself in order to find the root cause of the issue .