HI,

Please maintain the MTU at 1500. The BURT clearly indicates that there are issues in discovery with non default MTU size.

If the MTU is different than 1500 then set it back to 1500 and see if the issue goes off.

If not, Could you check in /opt/NTAPdfm/dfmmonitor.log for any discovery errors or issues.  Could you paste here if any.

Thanks,

  Arun