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STP with redundant switches?

I am new to STP and am trying to figure out if it can be used to supply switch redundancy or just link redundancy. Scenario:

- Server with teamed NICs
- Each NIC in the team is going to a different switch
- Each Switch is connected to a main switch

Here is crude diagram:

Network Diagram
Will STP work in this situation? Or will there only be 1 path in use here?

If the current path to the server is through switch B, and the A <-> B link goes down, will STP enable the link between A <-> C?

After doing some research my instinct tells me that the answer to the above question is no, STP will not work in this case. To get what I want I need to put Switches B and C in a stack, and at that point STP would work with the stacked switches?

If someone could clarify for me it would be appreciated.

2 Solutions
Andrej PirmanCommented:
STP is a technique to prevent loops inside redundant switching topology. It is not for providing redundancy.

If you have NIC Teaming in failover or Active-passive config, then there is no problem. But if you agregate them to get more speed, then NIC driver should be STP compliant, and all devices should use same STP version to work properly.
Spanning tree would not work in this example because the server is not a spanning tree bridge participant but just an end station.
nick-pecoraroAuthor Commented:
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