mininet> dpctl dump-flows mismatch with OvS 2.9.0

[LaochMumhain]

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Expected/Desired Behavior:

mininet> dpctl dump-flows # Would show flows in OvS.

Actual Behavior:

2018-12-03T13:58:10Z|00001|vconn|WARN|unix:/var/run/openvswitch/s1.mgmt: version negotiation failed (we support version 0x01, peer supports version 0x04)
ovs-ofctl: s1: failed to connect to socket (Broken pipe)

Detailed Steps to Reproduce the Behavior:

sudo apt install -y openvswitch-switch
git -C /home/ryu/ clone git://github.com/mininet/mininet
sudo /home/ryu/mininet/util/install.sh -n
sudo mn --version
2.3.0d4

Additional Information:

[gabay]

@LaochMumhain This error means the switch openflow version(0x04) differs from dpctl's version(0x01)

You can explicitly specify the switch's version like this: OpenFlow1.0: sudo mn --switch=ovs,protocols=OpenFlow10 OpenFlow1.3: sudo mn --switch=ovs,protocols=OpenFlow13

You can also specify dpctl's version using the -O option:

mininet> dpctl dump-flows
*** s1 ------------------------------------------------------------------------
2019-01-17T20:41:27Z|00001|vconn|WARN|unix:/var/run/openvswitch/s1.mgmt: version negotiation failed (we support version 0x01, peer supports version 0x04)
ovs-ofctl: s1: failed to connect to socket (Broken pipe)
mininet> dpctl dump-flows -O OpenFlow13
*** s1 ------------------------------------------------------------------------
OFPST_FLOW reply (OF1.3) (xid=0x2):