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Cisco Nexus Switches designed for data center, it runs NX-OS which support high performance and high reliability for data centers.
NX-OS and IOS are same as previously PIX OS and IOS.. they can do allot of things similar but configuration concepts, default values, commands are different.
NX-OS is majorly focused on Datacenter technologies and has allot of improvments on IOS.
i.e.
HSRP
... in iOS on1 device will be active.
... in NX-OS both can be active ... same as GSLB in iOS
vDC and vPC are the major advancements on iOS
Nexus switches are designed for datacenter management, virtulisation, storage technologies andUCS setupThere are so many features with Nexus like Vpc, Vdc, Otv etc
