The BOF persist parameter can specify whether the system should preserve system indexes when a save command is executed. During a subsequent boot, the index file is read along with the configuration file. As a result, a number of system indexes are preserved between reboots, including the interface index, LSP IDs, and path IDs. If persistence is not required and the configuration file is successfully processed, the system becomes operational. If persistence is required, a matching x.ndx file must be located and successfully processed before the system can become operational. Matching files (configuration and index files) must have the same filename prefix, such as test123.cfg and test123.ndx, and are created at the same time when a save command is executed. The persistence option must be enabled to deploy the Network Management System (NMS). The default is off.
Traps, logs, and console messages are generated if problems occur, and SNMP shuts down for all SNMP gets and sets; however, traps are issued.