Cannot learn on a third party device. No destination address in the third party devices I-Am response.


MSTP capture shows no destination network in the I-Am packet from the third party device. 

Product Line

Andover Continuum


  • BACnet
  • Third party device
  • Zone IO 583
  • I-am
  • Who-is
  • MSTP
  • Wireshark


The third party device may still respond to the Who-Is broadcast from Cyberstation, but is programmed to exclude the Destination Network in its I-Am response when the Network ID (UDP) is set to a value of 1. 


Use a Network ID that is an integer other than 1, or have the third party vendor correct the configuration issue.