The PowerVM internal network on POWER machines operates just like a physical network.

1. If two LPAR are on the same internal network and the root user puts the virtual adapter in to promiscuous mode then it can see all packets.
• Just like a physical network.
2. If the two LPARs are on different internal networks then they can never see the other LPARs packets.
• Just like two physical networks.
3. If two LPAR are on the same internal network but on different VLANs then they can never see the other LPARs packets.
• Just like a physical network using VLANs.

If in doubt think: "Just like a physical network" and you will not go far wrong.
 
Cheers Nigel