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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>

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