Description: There are two parts for the index depicted as follows:

31                15             0
+++++++++++++++++++++++++++++++++++
+ physical index   +  package index +
+++++++++++++++++++++++++++++++++++

From bit0 to bit15 (two bytes) is the Package index; Package file Index
is a monotonically increasing integer for the sole purpose of indexing
events.  When it reaches the maximum value, an extremely unlikely
event, the agent wraps the value back to 1 and may flush existing
entries.

From bit16 to bit31 (two bytes) is the physical index the same as the
entPhysicalIndex specified in ENTITY-MIB.

Any index beyond the above range will not be supported.

If a file is added in, its h3cSysPackageIndex will be the maximum
image index plus one.
If the package file is removed, renamed, or moved from one place to
another, its h3cSysPackageIndex is not reallocated.
If the package file's content is replaced, its h3cSysPackageIndex will
not change.