I have a ver strange situation in my network, recently i upgrade my switch from Cisco 2960 to Cisco 9300 48T with IOS XE and version Fuji 16.9.2. With the same basic configuration.
I have got a very simple scenario, before and now, I have an 9300 stack with ESXi server conected to the stack without portchannel, ( esxi got the control of both wires),
I have this port configured as Trunk, and in theESXi have several virtual machines configured. The problem is sometimes and randomly , The ESXI stop learning MAC in the same VLAN. And the Virtual Machines stop seeing each others ...
To solve the problem I need to regenerate the MAC in the Vcenter of the affeced Virtual machine, and magically works... With the previous switch this behaviour not happen never!.
I have got wireshark traces and nothing rare appears... Except some VN tag frames ...