On my ESXi 3.5 servers, I occasionally see a problem where - on newly started VMs - I see no traffic at all on their virtual network interfaces. I have to go into the VM settings and remove, then re-add the network interfaces before I see any traffic.
Has anyone seen this before? Is it possible I need to configure my physical switches (Cisco) differently to support this?
I'm using portgroups to present VLAN traffic to VMs - I've seen this happen on both trunked and untrunked ports, if that matters.