OID value: 1.3.6.1.2.1.4.22.1.1
OID description:
ipNetToMediaIfIndex OBJECT-TYPE SYNTAX INTEGER ACCESS read-write STATUS mandatory DESCRIPTION "The interface on which this entry's equivalence is effective. The interface identified by a particular value of this index is the same interface as identified by the same value of ifIndex." ::= { ipNetToMediaEntry 1 }
See also the OID Repository website reference for 1.3.6.1.2.1.4.22.1.1