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How to Capture the OpenFlow Messages?


Step by Step Capture the OpenFlow Messages

    Description:

       OpenFlow is a protocol that allows a server to tell network switches where to transmit packets. OpenFlow messages manipulated the flow entries in the flow table where messages are interchanged between the switch and controller via a secure channel. By maintaining a flow table, the switch can make forwarding decisions for incoming packets using a simple look at the entries of its flow table. The OpenFlow Protocol supports three message types, each with its own sub-types setup: 1. Controller-to-switch 2. Asynchronous, and 3. Symmetric. The Controller-to-switch Messages include Features, Configuration, Modify-State, Read-States, Packet Outs, Barrier, Role-Request, and Asynchronous-Configuration. The Asynchronous messages include Packet-in, Flow-Removed, Port Status, and Error. The Symmetric messages include Hello, Echo and Experimenter. To capture the OpenFlow messages, users have to follow the samples discussed in the below section:

    Open 4 Terminals:

      In Terminal1,

       sudo wireshark


      And start the capture for "loopback" or "any" interface


    In Terminal2,

      ryu-manager ryu.app.simple_switch_13


    In Terminal3,

      Sudomn --controller=remote,ip=127.0.0.1 --mac

      --switch=ovsk,protocols=OpenFlow13 --topo=single,4


      You will get the mininet prompt.

      In the mininet prompt, type pingall command

      pingall


    In Terminal4,

      sudo ovs-vsctl show


      sudo ovs-ofctl -O OpenFlow13 dump-flows s1


      Check the OpenFlow messages in Wireshark,

      Stop the Wireshark capture,

      In the filter, type "openflow_v4" to see the OpenFlow Messages.