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Thank you Sean K Mooney and Moshe Levi for your comments.

I have few follow-up questions. Not looking for a detailed answer(I
know you guys must be busy J). Looking for some basic info and will be
obliged if you can point me to a direction(link to code or docs) where
I can continue my research to understand more deeply.


1. What is the difference between neutron port_binding extension
vif_type and vnic_type?

2.How is a vif object in os_vif(eg VifHostDevice) gets related with a
vif_type(direct)?

3.Where does port_profile related data gets populated?

4.How is the decision of picking the correct networking back-end
os_vif plugin is made?

I guess everything comes under port binding negotiation.

-Pranab