Just to get this out of the way: This had better be for lab purposes because Dell hardware is explicitly not supported by Cisco for production, even on Specs-Bassed deployments.
The following are NOT supported:
Cisco, HP or IBM server models that do not satisfy the rules of this policy.
Cisco 7800 Series Media Convergence Servers (MCS 7800) regardless of CPU model
Cisco UCS Express (SRE-V 9xx on ISR router hardware)
Cisco UCS E-Series Blade Servers (E14x/16x on ISR router hardware)
Any other 3rd-party server vendor (such as Dell, Fujitsu, Oracle/Sun, NEC, etc.)
Cisco TAC is not obligated to troubleshoot UC app issues if the apps are deployed on unsupported hardware.
Having said that this is a generic ESXi question that is not specific to CUCM. Here's a document to get you started:
http://www.vmware.com/files/pdf/virtual_networking_concepts.pdf Beyond that the general idea is a basic vSwitch with a few active ports in it. You can use an EtherChannel if you wish.
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