Hmc Network Interfaces - IBM p5 590 System Handbook

HMC to logical partition
HMC to logical partition is a type of communication that is used to collect
platform-related information (hardware error events, hardware inventory) from
the operating systems running in the logical partitions, as well as to coordinate
platform activities (such as dynamic LPAR and concurrent maintenance) with
those operating systems. If you want to use service and error notification
features, it is important that you make this connection.
HMC to remote users
HMC to remote users is a type of communication that provides remote users with
access to HMC functions. Remote users can access the HMC in the following
ways:
By using the remote client to access all the HMC GUI functions remotely
By using SSH to access the HMC command line interface remotely
By using a virtual terminal server for remote access to virtual logical partition
consoles
HMC to service provider
HMC to service provided is a type of communication that is used to transmit data,
such as hardware error reports, inventory data, and firmware updates, to and
from your service provider. You can use this communications path to make
automatic service calls.

8.3 HMC network interfaces

The HMC supports up to three separate physical Ethernet interfaces. In the
desktop version of the HMC, this consists of one integrated Ethernet and up to
two plug-in adapters. In the rack-mounted version, this consists of two integrated
Ethernet adapters and up to one plug-in adapter. Use each of these interfaces in
the following ways:
One network interface can be used exclusively for HMC-to-managed system
communications (and must be the eth0 connection on the HMC). This means
that only the HMC, Bulk-Power Controllers (BPC) and service processors of
the managed systems would be on that network. Even though the network
interfaces into the service processors are SSL-encrypted and
password-protected, having a separate dedicated network can provide a
higher level of security for these interfaces.
Another network interface would typically be used for the network connection
between the HMC and the logical partitions on the managed systems, for the
HMC-to-logical partition communications.
IBM Eserver p5 590 and 595 System Handbook
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