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Hi,
In fact, we can split Quantum network Node into two categories:
one is for dhcp, which install ovs agent and dhcp agent. We can have one 
such kind of node
one is for l3 agent, we can deal with one external network on one l3 
agent. We can have many nodes of this kind.

Regards,

Yong Sheng Gong
On 10/30/2012 02:27 PM, balaji patnala wrote:
> Hi Salvatore,
> Just want to understand more on Network Node in the below given 
> app_demo page.
> As i see in the setup, it looks like there will be one Quantum Network 
> Node for one Data centre setup. Please correct me if my assumptions 
> are wrong.
> This Quantum Network Node will have all the virtual routers, gateway 
> which can be created with quantum-l3-agent plugin.
> Also my assumption is that this quantum Network Node will serve all 
> the Tenant virtual gateways and routers created using quantum.
> Please give us some more information on this to understand the setup.
> Also do we have any specific reason for having quantum Network Node 
> instead of keeping these plugin on the Controller Node similar to 
> earlier release like Essex.
> Thanks in advance.
> Regards,
> Balaji
>
> On Fri, Oct 26, 2012 at 3:31 PM, Salvatore Orlando 
> <sorlando at nicira.com <mailto:sorlando at nicira.com>> wrote:
>
>     Hi Trinath,
>
>     Even if is perfectly reasonable to run the DHCP/L3 agents in the
>     controller node, the advice we give in the administration guide is
>     slightly different.
>     As suggested in [1], the only Quantum component running on the
>     controller node should be the API server.
>     The DHCP and L3 agents might run in a dedicated "network node".
>     Please note you will need also the L2 agent running on that node.
>
>     Regards,
>     Salvatore
>
>     [1]
>     http://docs.openstack.org/trunk/openstack-network/admin/content/app_demo.html
>
>     On 26 October 2012 10:50, Trinath Somanchi
>     <trinath.somanchi at gmail.com <mailto:trinath.somanchi at gmail.com>>
>     wrote:
>
>         Hi Stackers-
>
>         I have found many installation and configuration manuals for
>         Openstack Folsom which state the installation and
>         configuration of Quantum-DHCP-Agent in the Controller machine.
>
>         But I have doubt here,
>
>         Can't we have the Quantum-DHCP/L3-Agent to be running in the
>         Compute NODE rather than in the controller.
>
>         How does the Installation and configuration change with this
>         type of Installation?
>
>         Please guide me on How to achieve the same.
>
>         Thanking you
>
>         -- 
>         Regards,
>         ----------------------------------------------
>         Trinath Somanchi,
>         +91 9866 235 130 <tel:%2B91%209866%20235%20130>
>
>
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