C-Type (Value),Description,Reference
0-1,Interface Role field,[RFC5837]
2,Unallocated - allocatable with Standards Action,[RFC5837]
3,Unallocated - allocatable with Standards Action,[RFC5837]
4,ifIndex included,[RFC5837]
5,IP Address Sub-object included,[RFC5837]
6,Name Sub-object included,[RFC5837]
7,MTU included,[RFC5837]