text: OpenShift SDN nodes also watch for subnet updates from the SDN master. When a subnet is 
  added, the node adds OpenFlow rules on br0 so that packets with a destination IP address in 
  the remote subnet go to vxlan0 (port 1 on br0) and thus out onto the network. The ovs-subnet 
  plug-in sends all packets across the VXLAN with VNID 0, but the ovs-multitenant plug-in uses 
  the suitable VNID for the source container. 
  
  Figure 4-4 shows the components that are involved in pods communication. 