Operating instructions
Chapter 2. IBM eServer BladeCenter overview 7
Management Module 1 Ethernet 3
→ Expansion Switch Module 3 Ethernet 15
Management Module 1 Ethernet 4
→ Expansion Switch Module 4 Ethernet 15
Management Module 2 Ethernet 1
→ Switch Module 1 Ethernet 16
Management Module 2 Ethernet 2
→ Switch Module 2 Ethernet 16
Management Module 2 Ethernet 3
→ Expansion Switch Module 3 Ethernet 16
Management Module 2 Ethernet 4
→ Expansion Switch Module 4 Ethernet 16
Figure 2-3 Management Module Ethernet interface
2.1.3 Gigabit Ethernet path
Discussed in Figure 2-4 on page 8 is the Gigabit Ethernet path. Each processor blade has a
minimum of two and a maximum of four EtherLAN interfaces. In particular, the BladeCenter
HS20 processor blade has two SERDES-based Gb Ethernet interfaces, one for each
midplane connector. With a daughter card installed, two more network interfaces can be
added. Each switch module (SW Module) receives one LAN input from each processor blade,
for a total of 14 inputs. The following partial listing illustrates the routing:
Processor blade 1 LAN 1
→ Switch Module 1 input 1
Processor blade 1 LAN 2
→ Switch Module 2 input 1
Processor blade 1 LAN 3
→ Expansion Switch Module 3 input 1
Processor blade 1 LAN 4
→ Expansion Switch Module 4 input 1
Processor blade 2 LAN 1
→ Switch Module 1 input 2
Processor blade 2 LAN 2
→ Switch Module 2 input 2
Processor blade 2 LAN 3
→ Expansion Switch Module 3 input 2
Processor blade 2 LAN 4
→ Expansion Switch Module 4 input 2
On processor blade, LAN 1 and LAN 2 are the on-board SERDES Gbit Ethernet interfaces,
and are routed to Switch Module 1 and Switch Module 2, respectively, for every processor
blade. LAN 3 and LAN 4 go to the Expansion Switch Modules 3 and 4, respectively, and are
IBM
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BladeCenter™ -
Management Module Ethernet Interface
Management
Module 1
Management
Module 2
CPU
Blade
1
CPU
Blade
2
CPU
Blade
14
Blower
Blower
Power
Module
Power
Module
Power
Module
Power
Module
Front
Panel/Media
Tray
Switch
Module
Switch
Module
Switch
Module
Switch
Module