The limit scalability of control plane restrict the scale of Software-defined Ad Hoc. The current solutions neither coexist with different controllers nor provide hightransmission efficiency. Thus
we propose an efficient West-East protocol for software defined Ad hoc: Open e Xchange protocol(OXP)
which supports heterogeneous controllers to cooperate together. We implemented OXP on the test bed to evaluate the performance. The result shows that OXP is a more efficient protocol