No VLANs either on v6 x86 on VMware ESXi 5.1 with E1000. Traffic without VLANs ist working normal. I can see Packets being send and received on the VLAN-Interface when doing nothing but ping to the IP of the VLAN-Interface. But I do not get an answer. Maybe the VLAN-RX is missimplemented so the switch drops the frames.
After downgrade to 5.25 everything works as expected. So no configuration issue.
Also VLANs on RB2011UAS (mipsbe) are working as expected under v6.
I will send a support.rif in a few minutes.