Determining the network ID for a Virtual Network Adapter?

I am trying to gather all the networking information on each VM on my ESX hosts through

VCenter and the Java SDK. I get the MOR for each of  the VMs and retrieve the "VirtualMachineConfigInfo".

From that I am able to look atn the VirutualHardware and find all the Ethernet cards. I get the

mac address and the name (string) of the portgroup. But the port group name is not unique

across ESX hosts. I need to get the network ID.

The olny way I can see to do that is to look at all the networks for that VM. I have to use each

network MOR to retreive the NetworkSummary. I then have to match the String names to get the

network ID.

Is there a better way to do this?