...
*ATTENTION*: In this way the system will run a trace and will write 1 file till it reaches 50MB. After that the file will be overwritten.
Where <DEVICE_IP> is the IP address of your device.
Method 2 (if you need to run syslog trace log time)
...
# sudo tcpdump -A -r /mnt/backups/traces/<FILE_NAME>.pcap | sed '/^\s*$/d' | grep -v "SYSLOG" > /homemnt/backups/admintraces/syslog_device_YYYY-MM-DD.log
...