For downstream LUs, the PeerLuLocalAddress identifies
the NAU address of the upstream LU to which this
downstream LU is assigned.
For upstream LUs, the PeerLuLocalAddress identifies
the NAU address of the downstream LU to which this
upstream LU is assigned.
If the PeerLuLocalAddress is zero, the LU is a pooled LU
and has not been assigned a peer LU from the pool.