IBM TotalStorage DS300 Best Practices Manual page 245

Figure 7-1 Configuration setup
The QLogic iSCSI Expansion Card is installed in an HS20 blade.
No special configuration of the D-Link gigabit ethernet switch modules in module
bay 1 and 2 or the Nortel layer 2/3 gigabit ethernet switch modules in bay 3 and 4
is required. The switches are in factory default state. External ports where
enabled to get the connect to the external Cisco 3550 series gigabit ethernet
switches for iSCSI traffic and public LAN access.
The BladeCenter has two management modules installed and all four module
bays are populated with gigabit ethernet switch modules. That is the reason that
the management modules are connected into the management network which
has no direct connect to either of the networks used for the switch modules in the
blade center. When the management modules are direct connected into one of
the networks used with the switch modules, the switches can see MAC
addresses from devices twice. One time they can see it over the management
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Chapter 7. TotalStorage DS300 installation