If the sending node is MultiRail and the receiving node is non-MultiRail,
the sending node use always the same NI (even if the sending NI is blocken, the blocken NI is used).
This may be the specification of MultiRail, but blocken device should be used.

    REMOTE  IB0              (non-MultiRail node)
            ↑
            x
            |
     LOCAL  IB0      IB1     <- always use IB0(not in round-robin fashion)
            failure    

If the receiving node is non-MultiRail, we check whether its device is normal or out of service and reset the device in case of failure.