Nimbostratus
CirrusHi @LA Medina - Does the below help?
tmsh modify sys db log.zxfrd.level value "debug"
tail -f /var/log/ltm
tmsh show ltm dns zone | more
Default Refresh interval for a zone is 10800 seconds/3 hours
You can lower that to accommodate the scale for your environment. Below in the log output, you can see it is set to 60s for lab purposes. This interval is used to proactively check the master nameserver for zone updates.
Jun 22 14:49:38 gtm1 debug zxfrd[4251]: 01531023:7: Scheduling zone transfer in 60s for dnsx.com from 203.0.113.15.
Jun 22 14:49:38 gtm1 debug zxfrd[4251]: 01531106:7: Availability status of dnsx.com changed from YELLOW to GREEN.
Jun 22 14:50:38 gtm1 debug zxfrd[4251]: 01531025:7: Serials equal (2017062201); transfer for zone dnsx.com complete.
Jun 22 14:50:38 gtm1 debug zxfrd[4251]: 01531008:7: Resetting transfer state for zone dnsx.com.
Jun 22 14:50:38 gtm1 debug zxfrd[4251]: 01531023:7: Scheduling zone transfer in 60s for dnsx.com from 203.0.113.15