OID value: 1.3.6.1.2.1.2.2
OID description:
ifTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF IfEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "A list of interface entries.  The number of
                      entries is given by the value of ifNumber."
              ::= { interfaces 2 }
See also the OID Repository website reference for 1.3.6.1.2.1.2.2