IBM RS/6000 SP Handbook page 377

In this case, the lowest IP address is node 1. However, you cannot assign IP
addresses to SP Switch adapters as follows:
spadaptrs 3 1 3 css0 129.33.34.13 255.255.255.0
Instead, use the IP address of the node with the lowest node number as follows:
spadaptrs 1 1 3 css0 129.33.34.11 255.255.255.0
The potential problem of changing from a CES system to an SP-attached system
is that the frame numbers configured in the CES system might duplicate those
used in the SP system. In such a case, you have to re-configure the frame
numbers and switch port numbers of all the SP and SP-attached nodes such that
the SP environment can be rebuilt. To avoid this problem, it is recommended to
reserve some frame numbers and switch port numbers for possible future SP
attachment.
For example, in Figure 10-17 on page 353, you have an CES system with frame
1 and frame 2 assigned with switch port numbers 0 and 1 respectively. If you add
switchless
a SP frame in the future, you have to assign the frame number 3 to the
SP, and then you have to switch port numbers 32-47 in the SP frame according
to the switch port numbering methodology.
You might find that the enterprise servers cannot use the switch port number 0
and 1 anymore since they are changed to SP-attached servers and must use the
switch port numbers in the SP system. However, switch port number 0 and 1 do
not exist.
CES system
Frame no. =1 Frame no. =2
Switch port no. = 0 Switch port no. = 1
Figure 10-17 Problem for CES to SP-attached migration
To make the migration possible, you have to reconfigure the frame numbers of
the enterprise servers to a larger number, for example 2 and 3, such that the SP
Add a switchless
SP frame
Frame no. = 3
(Switch port numbers: 32-47)
Switch port no. 0
and 1 does not exist
in the SP frame
Chapter 10. Clustering configurations
46 47
44 45
42 43
40 41
38 39
36 37
34 35
32 33
353