IBM 8852 User Guide - Page 52

BladeCenter networking guidelines, to flow from one internal switch to the other.

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Page 52 highlights

BladeCenter networking guidelines Make sure the network infrastructure is configured before you connect the BladeCenter unit to a LAN switch or similar network device. Each blade server has two independent Ethernet controllers, each with its own MAC address and a dedicated 1000-Mbps link to one of the switch modules in I/O module bays 1 and 2. There is no internal data path between the two switches within the BladeCenter unit; an external network device is required for data packets to flow from one internal switch to the other. The management module has a separate internal 100-Mbps link to each switch. These links are for internal management and control only. No data packets are allowed to flow from application programs on the blade servers to the management module over this path. 36 BladeCenter H Type 8852, 7989, and 1886: Installation and User's Guide

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BladeCenter networking guidelines
Make sure the network infrastructure is configured before you connect the
BladeCenter unit to a LAN switch or similar network device.
Each blade server has two independent Ethernet controllers, each with its own
MAC address and a dedicated 1000-Mbps link to one of the switch modules in I/O
module bays 1 and 2. There is no internal data path between the two switches
within the BladeCenter unit; an external network device is required for data packets
to flow from one internal switch to the other.
The management module has a separate internal 100-Mbps link to each switch.
These links are for internal management and control only. No data packets are
allowed to flow from application programs on the blade servers to the management
module over this path.
36
BladeCenter H Type 8852, 7989, and 1886: Installation and User’s Guide