Hardware Management Console Best Practices
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A server with dual HMCs would be connected to two private networks with each
HMC acting as a DHCP server on a unique, non-routable subnet.
In order to attach multiple p5 servers to one or a pair of HMCs, network switches
may be required. If you are planning to implement private networks over a switch
that supports VLAN (Virtual Local Area Network) technology, be sure that a
broadcast from the FSP will reach the HMC DHCP server quickly before the FSP
port goes to its default IP address. For example, if the switch port must have
spanning tree enabled, it should also have PortFast or the equivalent enabled.
As an additional step, determine whether the switch requires that the network
interface on the HMC be set to a specific speed or whether auto-detect may be
used. Hubs generally require the HMC to be set to a specific speed and duplex
setting.
2.5 Private vs. Open
The network connection between the HMC and the FSP can be either private or
open on low-end to mid-range servers. Private is preferred, and therefore a best
practice. A private network is required for systems that have a BPA, such as the
models 590, 595 and 575.
On a private network, the HMC acts as a DHCP server for the managed systems’
FSPs and BPCs. The IP address is assigned from a range of non-routable
addresses selected by the systems administrator when he configures DHCP on the
HMC. There are 20 possible ranges to choose from, and all are non-routable
subnets. The non-routable subnets isolate the HMC and the FSPs from other
HMC network interfaces.
An HMC may also manage FSPs over an open network on low-end and mid-
range systems. This scenario requires that the FSPs be network reachable from
the HMC. All HMC-to-FSP communication is SSL encrypted, whether over a
private or open network.
In an open configuration, the FSP’s IP addresses must be set manually on each
managed server. They cannot be DHCP clients of any server other than a
managing HMC.
Addresses can be set using the Advanced System Management Interface (ASMI)
on the FSP. This involves directly connecting a laptop to one of the ports on the
FSP and using HTTPS to log into one of the two pre-defined IP addresses. The
HMC1 port defaults to 192.168.2.147; HMC2 defaults to 192.168.3.147. The
systems administrator can login as user “admin” using the default password
“admin,” which should be changed during the initial installation for security
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