If you mean ESX check out the below links, you basically create a vSwitch and assign multiple physical NIC's to it for load balancing and failover.
VMware ESX Server 3 802.1Q VLAN Solutions - http://www.vmware.com/pdf/esx3_vlan_wp.pdf
Networking Virtual Machines - http://download3.vmware.com/vmworld/2006/TAC9689-A.pdf
Networking Scenarios & Troubleshooting - http://download3.vmware.com/vmworld/2006/tac9689-b.pdf
ESX3 Networking Internals - http://www.vmware-tsx.com/download.php?asset_id=41
ESX Server, NIC Teaming and VLAN Trunking - http://blog.scottlowe.org/2006/12/04/esx-server-nic-teaming-and-vlan-trunking/
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Thanks, Eric
Visit my website: http://vmware-land.com
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