hwIFExtOutputHighOctetRate 1.3.6.1.4.1.2011.5.25.41.1.1.1.1.22

This object indicates the octet rate of the outgoing traffic on an interface. The rate value is 64 bits. hwIFExtOutputOctetRate indicates the lower 32 bits, while hwIFExtOutputHighOctetRate indicates the higher 32 bits.