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On 12/11/2012 11:38 AM, Trinath Somanchi wrote:
> Hi-
>
> Thanks for the reply. I still have some more doubts ... please find 
> then inline.
>
> Kindly help me understand these...
>
>
> On Tue, Dec 11, 2012 at 2:59 PM, Gary Kotton <gkotton at redhat.com 
> <mailto:gkotton at redhat.com>> wrote:
>
>     On 12/11/2012 09:50 AM, Trinath Somanchi wrote:
>>     Hi-
>>
>>     I have the following first set of doubts regarding the Folsom Quantum
>>
>>     [1] With regard of Quantum Plug-in, How does the RPC
>>     communication take place between the Agent and the plug-n ? In
>>     the source code, ovs_quantum_plugin.py, I find the setup_rpc
>>     method and AgentRPCAPI class what does the reverse RPC tasks. Can
>>     any one guide me on understanding this.
>
>     When the OVS detects that a new interface has been added it will
>     query the plugin for the interface details. This will enable it to
>     create the relevant networking for the specific interface, for
>     example tags etc. The agent requests information from the plugin
>     when it detects that there is a new resources.
>     In addition to this there are cases when the plugin will notify
>     the agent - for example if the admin status of a port has changed.
>
>
>>
>>     [2] What is the significance of the file
>>     quantum/db/dhcp_rpc_base.py? Many plugins in the quantum/plugins
>>     directory use the methods in the class.
>
>     This enables the DHCP agent to request information from the plugin.
>
> Trinath>> But then dhcp-agent has to use this api. But why the plugins 
> are using this api? I see in the source code that, ryu, nec and ovs 
> plugins use this dhcp_rpc_base for redirected processing of data.

The DHCP agent makes use of RPC call to access the information. The 
plugin needs to treat these calls. Each plugin is responsible for the 
persistent data hence the code that you have mentioned.

>
>
>>
>>     [3] With core_plugin configuration being in place, can we have
>>     some other plugin too existing in Quantum? Can any one guide me
>>     on how to achieve the same, like a Fake plugin?
>
>     In V2 there is no fake plugin. There are a number of different
>     plugins that make sue of the base DB plugin - for example the
>     linuxbridge, openvswitch, NEC, RYU etc.
>
>
>>
>>     [4] Why OVS quantum Plug-in doesn't support create/update/delete
>>     of port and subnets?
>
>     The OVS plugin inherits the base plugin. If it does not need to
>     make any additions then it will use the base methods
>     implementation. If you look at
>     https://review.openstack.org/#/c/16210/ you will see that in some
>     cases changes need to be made - for example extending the ports to
>     support security groups.
>
>
>>
>>
>>     Kindly help me understand these ...
>
>     It is all pretty complicated. My suggestion would be to get a
>     evstack installation up and running and playing around with the
>     configurations and the agents. Once you start to understand how
>     all of the components interact it will be easier to follow.
>
>>
>>     Thanks in advance
>>
>>
>>
>>     -- 
>>     Regards,
>>     ----------------------------------------------
>>     Trinath Somanchi,
>>     +91 9866 235 130 <tel:%2B91%209866%20235%20130>
>>
>>
>>
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>
> -- 
> Regards,
> ----------------------------------------------
> Trinath Somanchi,
> +91 9866 235 130
>

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