Automatic Destination Field Screening

Network management messages can be screened automatically by gateway screening without configuring an Allowed Affected Destination Field screen. The destfld=yes parameter specified with the ent-scrset or chg-scrset commands turns on automatic screening of the affected destination point code (see Figure 7-2) in the network management messages. Network management messages contain the value 0 in the service indicator field of the SIO. The network management messages are screened against the routing table, the EAGLE’s point code, and capability point codes. If the affected destination point code matches the EAGLE’s point code, capability point codes, or point codes in the routing table, the message is allowed into the EAGLE. The automatic screening is applied after the last screen in the screening process, containing the nsfi=stop parameter, for that screen set.

These network management messages are automatically screened by gateway screening: TFP, TFA, TFR, TFC, UPU, SRST (RSP, RSR). All other network management messages are allowed into the EAGLE.