OID value: 1.3.6.1.2.1.2.2.1.15
OID description:
ifInUnknownProtos OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The number of packets received via the interface which were discarded because of an unknown or unsupported protocol." ::= { ifEntry 15 }
See also the OID Repository website reference for 1.3.6.1.2.1.2.2.1.15