VDC's - Virtual Device Contexts. Means I can split a physical nexus in to logical nexus which are totally isolated. If I want to connect VDC's together from within the same chassis there would be a cable coming out of one port on the nexus belonging to VDC 1 and physically plugging back to the same chassis to a different VDC e.g. VDC 2.
VPC - Virtual Port Channel. Its a means to provide an end host or switch(s) with multiple physical links to from two separate Nexus devices, be it the 7Ks or the 5Ks, that is one virtual link, like port-channel or etherchannel. But is not a stacking technology for Nexus.
VSS - Virtual switching system. This is a great technology whereby two physical chassis like c6500's can form in to one virtual device - this is like a stacking technology, you have one of the chassis active in the control plane, but both are forwarding data plane traffic.
The Cisco ASR 9000 is probably more of a service provider router - very powerful for routing and extremely controlled! OS and command line is a lot different that normal IOS or NXOS.
The Cisco Nexus is more a Data Center or Core network switch where it has a fairly rich feature set to support data center applications with technologies like OTV inbuilt.
Hope this helps.
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常见的数据中心之间通信均会采用运营商MSTP/OTN专线进行互联实现通信，由于长途线路价格昂贵通常我们需要最大化使用线路带宽，传统的网络传输中通常是尽力而为传输一旦突发流量较大就会发生线路拥塞的情况，从而影响业务正常通信传输。这时候我们可以采用Qos技术来实现数据中心思科设备之间关键网络流量保障，从而实现链路最大化利用。拓扑图场景如下：如上图，SW01是位于数据中心A的广域网接入Cisco Nexus 3048交换机，SW02是位于数据中心B的广域网接...
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