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Interesting question.

I've not used neutron in that way, if you don't get any relevant
responses here I'd suggest reposting under a different subject like
"programatically binding to neutron ports" or something similar, you
may get a different set of readers, perhaps posting to the
openstack-dev list (if you do be sure to include '[Neutron]' in your
subject) as this is something typically done by services
(nuetron-dhcp-agent, neutron-l3-agent, nova-compute) rather than a
manual action by an operator or end user.

-Jon

On Tue, Jan 7, 2014 at 11:33 PM, Ageeleshwar Kandavelu
<Ageeleshwar.Kandavelu at csscorp.com> wrote:
> Lets say I do not want to launch nova instances that connect to a port. I want to introduce a service that binds to that port similar to dnsmasq. How do I make neutron perform this for me.
> ________________________________________
> From: jonathan.proulx at gmail.com [jonathan.proulx at gmail.com] on behalf of Jonathan Proulx [jon at jonproulx.com]
> Sent: Tuesday, January 07, 2014 8:33 PM
> To: Ageeleshwar Kandavelu
> Cc: openstack at lists.openstack.org
> Subject: Re: [Openstack] Neutron port-create command
>
> On Tue, Jan 7, 2014 at 12:22 AM, Ageeleshwar Kandavelu
> <Ageeleshwar.Kandavelu at csscorp.com> wrote:
>> I am using neutron openvswitch plugin. I successfully created a port using
>> neutron port-create, but I do not see the newly created port when I do
>> 'ovs-vsctl show'. Is it that the port created is just a logical entity that
>> just exists only in DB and only when a VM is launched It is created in
>> openvswitch?
>
> port-create creates the port in the database, it's on a 'real thing'
> until it is associated with an instance.  At that point you can see it
> in ovs tools.
>
> Note you don't need to create ports if you associate in instance with
> a network it will dynamically create ports that are removed on shut
> down.  This is the more 'normal' use case.  I use port-create to get
> static MAC addresses for certain node locked software services (flexlm
> license server in my case), there are likely other uses and I wouldn't
> be surprised if using pre defined ports could shave a few seconds off
> start up times, but not personally certain about that.
>
> -Jon
> http://www.csscorp.com/common/email-disclaimer.php