Hitachi Compute Blade 2000 User Manual page 1357

Divide a virtual network into multiple broadcast domains for each virtual NIC

On the Virtual NIC (VNIC) Assignment screen, specify "untagged port" for the
virtual NIC and the VLAN ID to which it belongs. There is no need to make
VLAN settings in the guest OS because there will be no tags on the packets
received by the virtual NIC.
This means that the guest OS will not be aware of the VLAN, so you can divide
the broadcast domain for each virtual NIC.
Assign one virtual NIC to multiple broadcast domains within the same virtual

network
By making VLAN settings for the virtual NIC from the guest OS, you can use the
functions equivalent to the physical NIC to operate tags and perform frame
filtering. In addition, on the Virtual NIC (VNIC) Assignment screen, specify
"tagged port" for the virtual NIC, and specify all the VLAN IDs specified for the
virtual NIC in the guest OS.
This will make it possible to handle more than one VLAN ID per virtual NIC and
assign the virtual NIC to more than one broadcast domain.
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