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Cisco ACI Cookbook by Stuart Fordham

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Apart from the three user-defined classes, there are three reserved classes. The reserved classes are not configurable by the user, however.

The three reserved classes are:

  • IFC 
  • Control
  • SPAN

The IFC class classifies all traffic originating from or destined for the APIC. It is a strict priority class (whereby minimum and maximum bandwidth is guaranteed). 

The control class is also a strict priority class and prioritizes control traffic, such as protocol packets, and all SUP traffic (supervisor engine).

The SPAN class is a best-effort class, utilizing deficit weighted round robin (DWRR). DWRR serves to equal out the amount of bandwidth used; an example would be that if on one "turn" the queue uses 25% of the bandwidth, bursting ...

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