We're running vSphere 5.1 where I had one of our network guys create a new VLAN for us to be used as a private connection for a cluster heartbeat between 2 VMs. On a couple ESX hosts, I added the port group to an existing vSwitch; specifying a name and the VLAN ID. However, even before this I noticed that under the Network Adapters tab, the VLAN was popping in/out under the Status->Networks section of the vSwitch Properties on both hosts. The ports are trunked where I consistently see all of the other VLANs under Networks but only the new one shows up sometimes and isn't in the list most of the time. Has anyone seen this type of behavior before? Our network guys say they don't see anything wrong on their end so has to be a vSphere issue but I'm at a loss on how to troubleshoot this. Thanks in advance!
Clint