hwIFExtInputHighOctetRate 1.3.6.1.4.1.2011.5.25.41.1.1.1.1.20

This object indicates the octet rate of the incoming traffic on an interface. The rate value is 64 bits. hwIFExtInputOctetRate indicates the lower 32 bits, while hwIFExtInputHighOctetRate indicates the higher 32 bits.