After binding to an SCCP user SAP, the application receives a SCCPRUNSTATEIND event indicating the redundancy state of the SCCP layer on the board. The event type associated with this event indicates one of the following states:
|
Event type |
Description |
|
SPRS_STANDALONE |
Application is in a non-redundant configuration. Normal operation can begin. |
|
SPRS_PRIMARY |
SCCP task on this board is currently the primary board in a redundant board pair. Normal operation is allowed as long as the board remains the primary. |
|
SPRS_BACKUP |
SCCP task on this board is currently the backup board in a redundant board pair, monitoring the status of the primary. No active traffic passes through this SAP until the board becomes the primary member of the pair. |
The SCCPRUNSTATEIND event is the first message posted to the application's queue for each SAP after the binding is confirmed. No data traffic (unitdata or connections requests) should be directed to this SAP until this event is received.
Refer to the SS7 Health Management Developer's Reference Manual for information on writing redundant SCCP applications.