Cisco Nexus 1000V System Overview
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The Cisco Nexus 1000V is a software-based solution that works with any upstream physical switching system to provide standard networking functionality and controls to the virtual machine environment. For your clarity and understanding, Figure 18-17 shows a comparison of Cisco Nexus 1000V solution to a physical switch.

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Figure 18-17 Cisco Nexus 1000V Analogy to a Modular Physical Switch

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With the introduction of VMware vSphere 4, you had the option of three virtual networking solutions: VMware vSwitch, vDS, ...

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