Analogous to the HEC on the hosts, the corresponding MyRTP component on the switches is the SEC. The internal architecture of the SEC is similar to that of the HEC, as illustrated in Figure 4. The difference being the number of possible State Machines. In an SEC, there are as many State Machines are there are ports on the switch. In addition to maintaining similar information tables as the HEC, the SEC has to maintain additional lists containing information about the incoming and outgoing links of active connections and the routes to other SECs and HECs in the network.