hwifEthernetAutoSpeed
1.3.6.1.4.1.43.45.1.2.23.1.5.1.4.1.20
This object indicates which kinds of speed mode are negotiable
on this port.
Only when a bit of hwifEthernetAutoSpeedMask is '1', the corresponding
bit of this object can be set to '1', indicating the corresponding
speed mode is negotiable.
For example, if the value of hwifEthernetAutoSpeedMask is 0xA0,
which indicates speed mode 's10M' and 's1000M' are negotiable,
the possible value of this object should be one of the four values
(0x00, 0x20, 0x80 and 0xA0).
If the value of hwifEthernetSpeed is not 'auto', the value of this
object is insignificant and should be ignored. The value length of
this object should be as long as that of hwifEthernetAutoSpeedMask.