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From Murali Reddy <>
Subject Re: Review Request: BigSwitch VNS Networking Plugin
Date Thu, 31 Jan 2013 06:11:21 GMT

Thanks for the detailed explantation. I get the end-to-end flow now. If I understand correctly,
every flow across the VM's in same virtual network,  at initiation, still needs to go through
the controller right?

How do you expect 'shared network' be treated. Do you expect admin to setup the necessary
flow information through controller for shared networks?


From: Kanzhe Jiang <<>>
Date: Thursday, 31 January 2013 1:28 AM
To: Murali Reddy <<>>
Cc: "<>"
Subject: Re: Review Request: BigSwitch VNS Networking Plugin

Hi Murali,

When creating network, the plugin will capture the networkUUID, tenantID, vlan and send a
request to the controller to create a virtual network.
Controller will create an addressSpace construct to match the vlan so that all device in the
addressSpace has unique mac and ip, then create a virtual network. The membership of the virtualNetwork
is based on a tag rule. A tag rule is that any device with the tag will be classified to the
virtual network.

When a VM is created, will send a request to the controller to create
a port and attachment for the VM. The port contains the networkuuid. The attachment contains
the VM's mac address. The controller then associates the VM with its network tag.

At this point, nothing is happening to the switches yet.

When VM sends packets, the VM's network association is determined based on its first packet.
If the destination is in the same virtual network, the controller will permit the flow and
set up a end-to-end flow. When setting up the flow, vlan is programmed on the switches along
the route. The switches can be virtual or OF-enabled physical switches.

Then the network is destroyed, the plugin notifies the controller, which then removes the
tag and virtual network.

Hope the explanation clarifies the workflow.
Let me know if you have more question.


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