Aha, thankyou Saurav and Ben. I also use the of-dpa just as Saurav said. As i kown, Broadcom switch product named of-dpa support all of the openflow1.3 including the group chaining. When i testing the experiments in ovs, i found their is some difference between the ovs and of-dpa.
I think it maybe necessary to support the group chaining in the ovs because the softeware switch should get close to the hardware switch
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