Now that my ESX servers are setup, I’m setting up my storage. As I might have said before, I’d like to segregate my storage traffic on another VLAN. Having just plugged the cables in I had never bothered to check which NIC had what relationship with the VMNICs and on what ports they were on. I found out a couple of months ago that vSphere can pull information via CDP(Cisco Discovery Protocol) for the NICs located on ports that have this enabled. If you click that little thought bubble next to the VMNIC in Networking, you’ll see this lovely information, you might have more than me depending on the switch’s model.

If you don’t know if you have CDP enabled on a port, it’s very simple to do via these commands:
Cisco#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Cisco(config)#int fa0/3
Cisco(config-if)#cdp run
Cisco(config)#^Z
Cisco#
After that I was able to segregate all of the ports I wanted to use for iSCSI over to the VLAN I had made prior.