7.1 Single Server CTN In this section, we discuss recovery scenarios for a single server STP-only CTN. The scenario diagram is shown in Figure 7-2. Note that only one server is configured. CEC 1 PTS S1 z/OS A Figure 7-2 Single CEC configuration - STP Stratum 1 The example configuration has one server configured as Preferred Time Server (PTS) and Current Time Server (CTS - Stratum 1). 7.1.1 Prerequisites For single-server bounded CTNs, the CTN must contain only a single server and be operating in STP-only mode. This feature (saving STP configuration across PORs) applies to z990, z890, z9, and z10 servers. To enable this feature, the CTN must be configured with the checkbox Only allow the server(s) specified above to be in the CTN selected, as shown in Figure 7-3. The configuration data saved includes both the server's role as the PTS/CTS reflected in the Network Configuration tab. Figure 7-3 Configuring a single CEC "bounded" CTN - Network Configuration tab Chapter 7. Restoring STP configuration across PORs in a single or dual CEC CTN 207