The value of tmnxOspfVirtIfMD5TransmitKeyId indicates the index value
used to access the row entry in the tmnxOspfVirtIfMD5KeyTable that
specifies the authentication type and key transmitted on this
OSPF virtual interface. This object is valid only when
tmnxOspfVersion has the value 'version2'.
If tmnxOspfVirtIfMD5TransmitKeyId has a value of 0, it means that no
keys are configured.