The IBM eServer BladeCenter JS20 - IBM Redbooks
The IBM eServer BladeCenter JS20 - IBM Redbooks
The IBM eServer BladeCenter JS20 - IBM Redbooks
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Hardware management subnet<br />
We recommend that you establish a dedicated hardware management subnet.<br />
<strong>The</strong> 10/100BaseT Ethernet interface on the Management Modules installed in<br />
each <strong>BladeCenter</strong> chassis provides the gateway to this subnet for each<br />
<strong>BladeCenter</strong> chassis. You need to install external LAN switches or hubs to<br />
interconnect the 10/100BaseT Ethernet interface on the Management Modules<br />
of each <strong>BladeCenter</strong> chassis with external management systems.<br />
You use this subnet to access the Management Module Web interface and<br />
command line interface (CLI). You also use this subnet to access the Web<br />
interface and CLI of I/O modules.<br />
System management applications such as <strong>IBM</strong> Director or <strong>IBM</strong> Cluster Systems<br />
Management (CSM) also use this subnet to communicate with the hardware<br />
management functions of the <strong>BladeCenter</strong> infrastructure.<br />
Restrict access to this subnet to those management systems, system<br />
administrators, and operators who have responsibility for managing the<br />
<strong>BladeCenter</strong> infrastructure.<br />
You need to allocate multiple IP addresses to each <strong>BladeCenter</strong> chassis on this<br />
subnet, including:<br />
► One IP address for the external interface of the Management Module in each<br />
<strong>BladeCenter</strong> chassis<br />
► One IP address for the internal interface of the Management Module in each<br />
<strong>BladeCenter</strong> chassis<br />
► One IP address for the management interface of each I/O module in each<br />
<strong>BladeCenter</strong> chassis<br />
Note: Although the logical network view illustrated in Figure 4-1 shows the I/O<br />
Management Module interfaces connecting directly to the hardware<br />
management subnet, they are physically connected via the Management<br />
Module, which acts as gateway to those interfaces. <strong>The</strong> Management Module<br />
performs a proxy Address Resolution Protocol (ARP) function to make it<br />
appear as though the I/O module management interfaces are attached to the<br />
hardware management subnet.<br />
It is possible to use a different subnet for the Management Module internal<br />
network interface and I/O module management interfaces. However, we do not<br />
recommend this configuration.<br />
Learn how to configure these IP addresses in Chapter 5, “Hardware setup” on<br />
page 69.<br />
56 <strong>The</strong> <strong>IBM</strong> Eserver <strong>BladeCenter</strong> <strong>JS20</strong>