links.push({
"source": lst[i].port.dpid, "target": lst[i].mac, "value": 2,
"port": { "source": lst[i].port.port_no, "target": 0 }
links.push({
"source": lst[i].port.dpid, "target": lst[i].mac, "value": 2,
"port": { "source": lst[i].port.port_no, "target": 0 }