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v2.0 in authentication or not?

Hello! I'm following http://docs.openstack.org/icehouse/install-guide/install/apt/content/neutron-ml2-compute-node.html to set up OpenStack on some QEMU instances.

I'm confused by the auth_url format: some like 'http://controller:xxxx/v2.0' and some just like 'http://controller:xxx' and without v2.0. I found in Havana the 'v2.0' may be a bug in authenticating process. So I want to know what should I do?

I followed the intructions on that page exactly and I met with 'Unauthorized: Authentication required' error when Neutron tried to create port on my 'demo-net'. So the problem is critical to me.

Great thanks!