Hi Wayne,
OpenFlowJ is an implementation of the OpenFlow protocol in Java, it has
methods that handle serialization and deserialization of OpenFlow
messages from ByteBuffers used by Java's NIO package. You can think of
it as an object oriented conversion of openflow.h to Java plus
serialization. There are also some simple examples of how you could
create a controller using it. Beacon in specific uses OFJ for these
tasks, then layers logic on top to handle and abstract the connections
to switches, provide APIs to register for switch events and specific
OpenFlow messages, and other commonly-used networking functions like
switching and routing, and the web UI you mentioned. You could
certainly use OFJ as a building block for your own controller if you
want to do something simple or mostly from scratch. If you just want to
create your own control logic it might be faster for you to build on top
of one of the controllers mentioned.
-David
On 6/23/2011 8:29 PM, Wei-Chih Chen wrote:
Dear all,
(I've sent this to openflow-support yesterday, but perhaps
openflow-discuss is more suitable?)
I am using XCP (Xen Cloud Platform), which includes *Open vSwitch*
(also an OpenFlow switch).
I would like to create virtual bridges of Open vSwitch and attach them
to VMs on XCP.
However, from the XCP community, they suggest to use OpenFlow
controllers to control Open vSwitch instead of using ovs- commands
directly.
I just tried *Beacon* and found that there is *openflowj*, which seems
official Java library for OpenFlow.
It seems that Beacon provides a web UI (and perhaps also provides some
useful functions) calling openflowj as backend.
For automatical configuration, my system needs a set of APIs to
control Open vSwitch through OpenFlow.
Does openflowj provide all functions that can fully configure OpenFlow
switches?
(That is, can I fully control OpenFlow switches by just using openflowj?)
Moreover, I take a look at *Maestro*, another Java-based OpenFlow
controller.
It seems to implement its own codes for communicating with OpenFlow
switches, not openflowj.
If this is true, which is recommended, *openflowj or Maestro*? (For
production enterprise network. Friendly GUI is not necessary)
Thanks!
Regards,
Wayne
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