Hi Carlos,
Thank you for your reply!
As you said, the OpenFlow Spec does not restrict Switches must initiate
connection to Controllers.
But initiating connection by Controllers seems to be the "optional" feature.
===
Quote: OpenFlow Spec 1.3.5 "6.3.3 Connection Setup"
===
Optionally, the switch may allow the controller to initiate the connection. In this case, the switch
should
accept incoming standard TLS or TCP connections from the controller, using
either a user-specified
transport port or the default OpenFlow transport port 6653. Connections
initiated by the switch and
the controller behave the same once the transport connection is established.
===
If OVS does not know on where Ryu is listening when OVS starting up, how about
using OVSDB library
to tell controller's IP:Port to OVS?
If OVS listening on OVSDB connection, "set-controller" API can tell its own
address to OVS.
https://github.com/osrg/ryu/blob/6e69e9b8a6ebd2bb06aa864cc76ef0b79d1ac9c3/ryu/lib/ovs/bridge.py#L128
And apart from that, initiating connection by Controllers looks interesting
feature for me.
Thanks,
Iwase
On 2017年10月04日 08:57, Carlos Ferreira wrote:
This is just a question, not a critic.
Doesn't the OpenFlow standard stipulates that it is the Switch that
must connect to a Controller, and not the other way around?
Carlos Ferreira
On 4 October 2017 at 00:42, Iwase Yusuke <iwase.yusu...@gmail.com> wrote:
Hi Matt,
As far as I know, Ryu does not provide such feature (only do wait incoming
connection like server).
Would you share us if you have any use-case or situation where Ryu must act as
a client?
If there are useful use-cases, better to implement it, I guess!
Thanks,
Iwase
On 2017年10月04日 07:16, Matthew Moskowitz wrote:
Hi,
By default when a Ryu application is started, it is listening for a connection
request that comes from the switch. (For instance, using ovs, you would run
ovs-vsctl set-controller to tell it where to talk to the Ryu application).
However, OpenvSwitch can also behave like a server and wait for a request from
an openflow controller.
Is there an existing setting that allows a Ryu application act as a client such
that the Ryu app will make the initial request to connect with the openflow
switch?
Thanks,
Matt
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