Chapter 25. Data Center Core (Nexus 7000) QoS Design
The primary quality of service (QoS) role of the data center core switch is to manage packet loss. Class of service (CoS) or differentiated services code point (DSCP) markings have already been set at the access layer or the virtual access layer of the data center, and therefore explicit classification, marking, and policing policies are usually not required at the core layer. So, the data center core switch should trust CoS and DSCP on ingress (which are NX-OS defaults) and perform ingress and egress queuing, as shown in Figure 25-1.
Figure 25-1 Data Center Core Switch Port QoS Roles
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