Timeliness Checks

The switch performs timeliness checks to ensure that PDUs are not reordered, delayed or replayed. These timeliness checks include the following information:

• Number of reboots since the switch was upgraded from v5.x application software to v6.x or since the last initialization of NVRAM.
• Number of seconds since the last switch reboot.

When the NMS starts up, it sends the switch a request message for this information. The switch responds with a report PDU that contains the information. Once the NMS and switch have synchronized this information, the NMS inserts it in all PDUs that it sends to the switch.

The switch discards any PDUs that contain:

• The incorrect number of switch reboots
• A 150-second or greater discrepancy in the number of seconds since the last switch reboot.