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]; h1 -> s1 [src_port=0, dst_port=0, cost=1];
s1 -> h2 [src_port=1, dst_port=0, cost=1]; h2 -> s1 [src_port=0, dst_port=1, cost=1];
h1 -> h1 [src_port=1, dst_port=2, cost=1]; h2 -> h2 [src_port=1, dst_port=2, cost=1]; }