item's status is error when network error with using dynamic index.
but item's status is not error when network error without using dynamic index.
different result in normal oid or dynamic index.

source:
checks_snmp.c
get_value_snmp()
[using dynamic index]
snmp_get_index function returned NETWORK_ERROR when snmp timeout.
but parent get_value_snmp returned NOTSUPPORTED.

[normal oid]
get_value_snmp returned NETWORK_ERROR in normal oid.