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IBM Flex System and PureFlex System Network Implementation with Juniper Networks by Tiago Nunes dos Santos, Gaston Sancassano Rodriguez, William King, David Cain, Jure Arzensek, Jon Tate

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Layer 3 Overview
This chapter provides an overview of Layer 3.
4.1 Layer 3
Without Layer 3 IP routing at the switch level, all cross-subnet traffic is relayed to the default gateway. That gateway provides the necessary IP address information and sends the data back down to the Layer 2 switch. Placing Layer 3 IP routing on the switch allows for cross-subnet traffic within the switch, which frees up the upstream router to handle only in-bound and out-bound traffic. Because IBM System networking switches use application-specific integrated circuits ...

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