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ccna 200 301 bookshare phone.The newer Nexus switches take flexibility to a new level by providing us with UnifiedPort, or UP, which is available for both Ethernet and Light Channel transceivers. We can choose which port type we want to use when configuring the device, and for both of these important port modes of operation, UnifiedPort gives us more flexibility than ever before!Don't be confused - you still need to use a separate SFP+ module to get the Ethernet port and the Light Channel port. Only we can now configure both modes on any UP port on a Nexus device, but not all Nexus switches support UP ports either, and you can find out which Nexus switches support UP ports by looking at the suffix UP in the device naming. For example, the CiscoNexus 5548UP and 5596UP, both of which offer highly flexible unified ports, have the UP suffix in their naming and the indicator bar next to the port is orange. Figure 7.7 illustrates the Nexus 5000 switch family.7.2 NX-0S Software OverviewIn comparing the Nexus hardware to the IOS hardware, we have been amazed at the many benefits that the Nexus hardware offers us, but the hardware differences are nothing in the face of the software differences between the two, and it is the software that makes the Nexus platform so outstanding. If you want to pass the exam, you must understand the NX-OS software and its components carefully!It is the design of NX-OS that makes it perfect for implementing mission-critical and data center services in an environment where reliability and fault tolerance are critical, while the rate aspect cannot be relaxed. Trying to accomplish these requirements is difficult, but the Nexus and MDS9000 platforms meet these needs by loading the powerful NX-OS to provide maximum capacity for data center network interconnect environments. The MDS platform previously used another operating system, called SAN.OS, but with NX-OS version 4.1, these two different hardware architectures can now use one OS at the same time!7.2.1 NX-OS ArchitectureSince the NX-OS architecture has the ability to handle Layer 2, Layer 3 and storage protocols, it is thus able to perform 3 different functions. Like most modern network interconnects today, NX-OS is based on the Linux kernel and is built on a reliable multitasking OS. The ASIC (Application Specific Integrated Circuit) is added on top of this to create a high-performance cross-system architecture. In summary, NX.OS is capable of supporting multiprocessors and CPUs, as well as line card processors ...... But how does it do so?For starters, it is important to first establish the concept of the control plane and data plane, which are separate from each other and therefore provide uninterrupted data forwarding, minimizing the chance of data interruptions. Also, those that need to consume a lot ofFigure 7.7 Nexus 5000 FamilyChapter 7 Introduction to the Nexus