On Wed, 27 Jun 2018 23:59:53 +0900,
Soliman Awad Alshra´a Abdullah TU Ilmenau wrote:
> What are the reasons to see the next lines ?

The reason is probably written in your original email.

> switch features ev 
> version=0x4,msg_type=0x6,msg_len=0x20,xid=0x4109cbb7,OFPSwitchFeatures(auxiliary_id=0,capabilities=79,datapath_id=276,n_buffers=256,n_tables=254)
> Datapath in process of terminating; send() to ('127.0.0.1', 41540) discarded.

Take a look at the Datapath.send method.
Probably OFPHandler.switch_features_handler tried to send a
OFPPortDescStatsRequest, but the datapath was being terminated.
So the request couldn't be enqueued and was discarded.

--
IWAMOTO Toshihiro

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