when devices do go to the Unconnected View, it is usually one of two situations:
1. CDP information is not propagating properly or configured
CDP is vital for the device to show up on your Layer 2 View. Campus Manager in LMS queries the CDP table from each Cisco device and see if there's a matching entry on another Cisco device. When that is confirmed, then and only then that device shows up in your Layer 2 view.
2. SNMP issue: either timeouts or not configured
SNMP timeouts are a very common problem when dealing with a network of a large scale and/or a network with many switches. At times, when the SNMP queries a Cisco Device, the request times out trying to respond.
try only deleting and re-adding on the problenmatic device from common service and then run a new data collection followed by user tracking acquisition.
once data collection and user tracking get finished then run the topology and check the issue.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...