SNMP server HP Open View can ping NE 16 but all SNMP packets were discarded.
Constant bad SNMP version errors
in such cases following command should be used
snmp-server enable version v1 v2c.
Otherwise SNMP PDU''s will be discarded although on lower levels managed devise might be pingable.
After analyzing the phenomena it is noticed that HP open view works with SNMP version 2C and NE is set by default to version 3.