<div dir="ltr">Thanks Bob :)<div><br></div><div>Its really a nice explanation.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jan 23, 2015 at 1:01 PM, Harish Patil <span dir="ltr"><<a href="mailto:harish.patil@qlogic.com" target="_blank">harish.patil@qlogic.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">><br>
<br>
>Hi Harish,<br>
><br>
>Port binding in ML2 is the process by which a mechanism driver (or once<br>
><a href="https://blueprints.launchpad.net/openstack/?searchtext=ml2-hierarchical-po" target="_blank">https://blueprints.launchpad.net/openstack/?searchtext=ml2-hierarchical-po</a><br>
>rt-binding<br>
>is merged, potentially a set of mechanism drivers) is selected for the<br>
>port, determining how connectivity is provided for that port. Since ML2<br>
>is designed to support heterogeneous deployments, its possible for<br>
>different ports to be bound using different mechanism drivers.<br>
><br>
>The end results of port binding visible outside ML2 are the values of<br>
>the binding:vif_type and binding:vif_details port attributes that<br>
>control the Nova VIF driver behavior. The inputs to the port binding<br>
>process are the port and the network to which the port belongs,<br>
>including the network's set of segments, as well as the values of the<br>
>binding:host_id, binding:vnic_type, and binding:profile port attributes.<br>
>Nova (or any L3, DHCP, or service agent owning the port) sets<br>
>binding:host_id to indicate the host on which the port is being bound.<br>
>The setting of this attribute triggers the port binding process.<br>
><br>
>During port binding, the bind_port() method is called by ML2 on each<br>
>registered mechanism driver until one driver indicates it has succeeded<br>
>by calling PortContext.set_binding(). The driver calls<br>
>PortContext.set_binding() with the identity of the network segment it<br>
>bound, and the values for the binding:vif_type and binding:vif_details<br>
>attributes. Typical mechanism drivers for L2 agents decide whether they<br>
>can bind the port by looking through the list of network segment for one<br>
>with a network_type value that the agent on the host identified by<br>
>binding:host_id can handle, and if relevant, a physical_network value<br>
>for which that agent has connectivity. The current L2 agent mechanism<br>
>drivers use agents_db info sent from the agents to the service via RPC,<br>
>including the agent's health and the bridge_mappings or<br>
>interface_mappings value that describes its connectivity to<br>
>physical_networks.<br>
><br>
>The doc strings in neutron.plugins.ml2.driver_api provide more detail on<br>
>port binding and the classes and methods involved.<br>
><br>
>Hope this helps,<br>
<br>
</div></div>Sure it does, thanks very much Bob.<br>
<div class="HOEnZb"><div class="h5"><br>
><br>
>-Bob<br>
><br>
>On 1/21/15 9:42 PM, Harish Patil wrote:<br>
>> Hello,<br>
>> I’m a newbie here. Can someone please explain to me as to what exactly<br>
>>is<br>
>> involved in ‘port_binding’ in ML2 mechanism driver and any specific<br>
>> pointers? Is it just an association with its corresponding L2 agent?<br>
>>What<br>
>> is mechanism driver expected to return back to port_bind?<br>
>><br>
>> Thanks<br>
>><br>
>> Harish<br>
>><br>
>><br>
>><br>
>><br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><b style="color:rgb(102,102,102)">Regards,</b><div><b style="color:rgb(102,102,102)">Romil <br></b><br></div></div></div>
</div>