Trying to get to the bottom of why some DFM alerts show the alerting device as an IP address instead of the name.
From what I can see the devices that do this are not listed in DFM Known Devices even though the Object Finder applet and Device Center both show the devices as being managed by DFM. DFM is set to auto populate from the DCR
At first I got to thinking that the problem was caused by the device's snmp trap source IP address not being the same as the managed address in LMS / DNS /ACS. But I have since found that there are some layer2 only switches in there that have only one IP address. I have also checked a few with "resolver.pl" and all looks good.
What would cause this in DFM?