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LAN Addressing
The thirty two bit private LAN address is defined as follows:
nnnnnnnn. mmmmmmmm . pppppppp . eeeeeeee
The value of mmmmmmmm determines the meaning of the values of pppppppp
and eeeeeeee.
LAN Address
The LAN address = nnnnnnnn = 10
Cabinet ID
Cabinet IDs are unique and are determined by the setting of the OCP push-
wheel on each cabinet door. Each cabinet must have a unique number. Cabinet
IDs are represented in network addresses in two ways depending upon whether
you are addressing components in system space or components in IO space:
1. When addressing system space components like MBMs, CMMs, and
CPUs, the upper 4 bits of mmmmmmmm are the cabinet ID number.
2. When addressing IO space components like the PBM, mmmmmmmm =
254 and eeeeeeee = the cabinet ID.
The valid range for the cabinet ID set by the push-wheel on the cabinet door is 0
to 7.
MBM ID
The MBM ID is set by the push-wheel on the 2P or 8P drawer. This ID
corresponds to the address of the backplane in the drawer and is fundamental in
determining other physical addresses for both the system and the server
management LAN. The lower four bits of mmmmmmmm are the MBM ID
number. Thus mmmmmmmm = a specific MBM in a specific cabinet. With this
unique number, firmware determines addresses for memory, CPUs, and the port
locations for north, south, east, and west IP ports.
The valid range for the MBM ID set by the push-wheel on both the 2P and 8P
drawers are 0 to 3.
PBM ID
The PBM ID is set by the push-wheel on the IO drawer. When mmmmmmmm =
254, pppppppp = the PMB ID set by the push-wheel on the OCP of the IO
drawer.
Network ID Table
If mmmmmmmm =
Cabinet ID + MBM
If mmmmmmmm =
PBM fla
254
If mmmmmmmm =
special (253 decimal)
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