Two notes to remember with a single nic setup:
1) Promiscuous needs to be enabled on the portgroup/vlan level (i.e. not vSwitch):
(http://wanos.org/wan-optimization/wp-content/uploads/2014/05/wan-acceleration-esxi-promiscuous.png)
2) Depending on the switch config, bpdufilter might be required:
interface FastEthernet0/5
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 30,101
switchport mode trunk
spanning-tree portfast trunk
spanning-tree bpdufilter enable