Open Stack

I have been looking at 
http://docs.openstack.org/developer/devstack/guides/neutron.html and 
wonder about a few things.

In the section 
http://docs.openstack.org/developer/devstack/guides/neutron.html#using-neutron-with-a-single-interface 
there is a helpful display of localrc contents.  It says, among other 
things,

        OVS_PHYSICAL_BRIDGE=br-ex
        PUBLIC_BRIDGE=br-ex

In the next top-level section, 
http://docs.openstack.org/developer/devstack/guides/neutron.html#using-neutron-with-multiple-interfaces 
, there is no display of revised localrc contents and no mention of 
changing either bridge setting.  That is an oversight, right?  I am 
guessing I need to set OVS_PHYSICAL_BRIDGE and PUBLIC_BRIDGE to different 
values, and the exhibited `ovs-vsctl` commands in this section apply to 
$OVS_PHYSICAL_BRIDGE.  Is that right?  Are there other revisions I need to 
make to localrc?

Looking at 
http://docs.openstack.org/networking-guide/scenario_legacy_ovs.html (or, 
in former days, the doc now preserved at 
http://docs.ocselected.org/openstack-manuals/kilo/networking-guide/content/under_the_hood_openvswitch.html
) I see the name br-ex used for $PUBLIC_BRIDGE --- not $
OVS_PHYSICAL_BRIDGE, right?  Wouldn't it be less confusing if 
http://docs.openstack.org/developer/devstack/guides/neutron.html used a 
name other than "br-ex" for the exhibited commands that apply to 
$OVS_PHYSICAL_BRIDGE?

The section 
http://docs.openstack.org/developer/devstack/guides/neutron.html#neutron-networking-with-open-vswitch 
builds on 
http://docs.openstack.org/developer/devstack/guides/neutron.html#using-neutron-with-multiple-interfaces 
NOT 
http://docs.openstack.org/developer/devstack/guides/neutron.html#using-neutron-with-a-single-interface 
--- right?  Could I stop after reading that section, or must I go on to 
http://docs.openstack.org/developer/devstack/guides/neutron.html#neutron-networking-with-open-vswitch-and-provider-networks 
?

The exhibited localrc contents in section 
http://docs.openstack.org/developer/devstack/guides/neutron.html#using-neutron-with-a-single-interface 
include both of these:

        Q_L3_ENABLED=True
        Q_USE_PROVIDERNET_FOR_PUBLIC=True

and nothing gainsays either of them until section 
http://docs.openstack.org/developer/devstack/guides/neutron.html#neutron-networking-with-open-vswitch-and-provider-networks 
--- where we first see

        Q_L3_ENABLED=False

Is it true that all the other sections want both Q_L3_ENABLED and 
Q_USE_PROVIDERNET_FOR_PUBLIC to be True ?

Thanks,
Mike

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