digraph g1 {
h1; h2; m1; s1[type=switch, ip=“11.0.0.1”, id=1];
s1 -> h1 [src_port=0, dst_port=0, cost=1, capacity=“1Gbps”]; h1 -> s1 [src_port=0, dst_port=0, cost=1, capacity=“1Gbps”];
s1 -> h2 [src_port=1, dst_port=0, cost=1, capacity=“1Gbps”]; h2 -> s1 [src_port=0, dst_port=1, cost=1, capacity=“1Gbps”];
s1 -> m1 [src_port=2, dst_port=0, cost=1, capacity=“1Gbps”]; m1 -> s1 [src_port=0, dst_port=2, cost=1, capacity=“1Gbps”];
h1 -> h1 [src_port=1, dst_port=2, cost=1, capacity=“1Gbps”]; h2 -> h2 [src_port=1, dst_port=2, cost=1, capacity=“1Gbps”]; m1 -> m1 [src_port=1, dst_port=2, cost=1, capacity=“1Gbps”]; }