With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global d...
So -subtable parameter just gives name for table and it does not have anything to do with main table (without -subtable argument). ? So I can think that -subtable means actually -table (although parameter is not that)
that is: it is not nested table.
( keys on table are not on relation on keys of main (unnamed) table )