Primary And Secondary Hmc To Bpc Connections - IBM p5 590 System Handbook

The Bulk Power Controllers are dependent upon the HMC to provide them
with DHCP addresses (there is no way to set a static addresses)
The HMC must distribute information to the service processors and BPCs
about the topology of the network.
The service processors acquire their TCP/IP address information from the
HMC as they are connected to the HMC through an internal hub in the BPC,
and then through the network connection from the BPC to the HMC.
The use of two HMCs requires the use of different DHCP address ranges, so that
the two Ethernet interfaces in each service processor and BPC are configured on
different subnets.
If there are multiple systems (additional Managed Server Frames) then an
external hub or switch is required for each of the private networks.
Figure 8-4 shows the connections between a primary and secondary HMC and
the redundant BPCs in a system frame. If additional powered frames are
attached, hubs are used to connect the network. Notice the need for a network
connection between each HMC and the corresponding BPC in a given
configuration.
Primary HMC
For single-frame
systems, these external
switches not required
Figure 8-4 Primary and secondary HMC to BPC connections
IBM Eserver p5 590 and 595 System Handbook
206
To other system
Hub
9119 system frame
BPC-A
Internal
Hub
Service
Processor 0
TCP/IP Ethernet connections
Hub
Secondary HMC
Hub
frames
BPC-B
Internal
Hub
Service
Processor 1
Public
network
Private
network