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Unsure what bridges to create?

I'm currently following the OpenStack Juno guide for Ubuntu 14.04:

http://docs.openstack.org/juno/install-guide/install/apt/content/

The only bit I'm confused on is where to configure network bridges for use with OVS? From what I can tell, the guide only wants a bridge created for the external network on the network node. However, I'm unsure if I also have to create a bridge for the tunnel network between my compute node and network node? I keep reading about br-int for internal traffic in the OVS but am unsure if this actually needs creating in the interfaces file itself?

I'm attempting a three node setup.

Many Thanks

OH