The state of this trusted trap destination entry. Enable (1)
defines an entry that is valid. Disable (2) defines an entry
that is valid but not enabled. Delete (3) removes an entry
from the table. Invalid (4) defines an entry that is no
longer valid (e.g., an entry that was deleted) and should be
ignored. An attempt to set a value of invalid (4) causes the
agent to return SNMP_BADVALUE.