•The fault service daemon runs on all switch nodes in the RS/6000 SP, but not on the dependent node. Therefore, the dependent node does not have the full functionality of a normal RS/6000 SP Switch node.
•The dependent node requires the SP Switch’s primary node to compute its switch routes. Therefore, the primary node must have at least PSSP 2.3 installed, otherwise the dependent node cannot work with the RS/6000 SP.
•In the RS/6000 SP, SP Switch nodes occasionally send service packets from one node to the next to keep track of status and links. Sometimes these packets are sent indirectly through another switch node. As the dependent node is not a standard RS/6000 SP Switch node, it cannot be used to forward service packets to other nodes.
