NVRAM based level of the system selftest. It is supported only by the MegaSwitch II family. The values are : ststNone - meaning that no selftest will be executed upon boot-up ststShort- meaning that a short selftest, of approx 10-20 seconds will be executed upon boot-up ststLong - meaning that a long/extensive selftest will be executed upon boot-up ststDiagnostics - meaning that upon boot-up the diagnostics mode is entered. In this mode it is possible to interactively select the test or the group of tests that will be executed. This value may not be set through an SNMP set command.