Open Stack

Hi,
I am working with a vendor who has virtualized his appliance.The vendor's appliance is essentially a bump-in-the-wire appliance.
Consider the diagram below.The vendor's appliance is B connected to ports 2 and 3.Whatever comes into B from port 2 is acted upon and then the samepacket is sent towards port 3.  Similarly, anything that comes into B from port 3 is acted up and then thesame packet is sent towards port 2.

A      B   C

|     | |  |

1    2  3   4

--------------

OpenVswitch

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Obviously, there are issues with implementing such a function with Openstackdue to flooding and unknown unicast MAC issues.Has anyone successfully implemented a bump-in-the-wire function such as B with openstack ?
thanks,Farhad.
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