PCIe Root Complex Connections (Dual-Processor Configurations)
This topic describes the PCIe root complex topology in servers with two processor modules installed and operational.
This diagram illustrates the root complex connections between the four CPUs and the 16 PCIe I/O slots. Each CPU supports two I/O root complex fabrics. Each root complex connects to two I/O slots through one of five multiplexing switches.
The port ID values shown in the diagram correspond to the pci@ values reported in the showdevs command output. For example:
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If you are reviewing root complex changes after adding a second processor module, return to Server Upgrade Process.