How do I bridge multiple physical ports in ESXi 5.x?
Solution 1:
Based on what you're trying to accomplish I think what you could probably do is to create a new vSwitch for pNic 2 and then create a VM with two vNic's, one vNic connected to vSwitch1 and one to vSwitch2 and set it up to route/bridge/proxy traffic between the two vSwitches.
Solution 2:
You would accomplish by creating a separate vSwitch. Your uplinks would be discrete. There's no reason all of the VMs would need to reside on the same vSwitch.
Given the diagram, why wouldn't you plug the standalone host into the network, bypassing the ESXi host?