I'm interested in finding a succinct explanation of the difference between CoS and QoS. So, what is the difference between QoS and CoS?
QoS vs. CoS
Sep 14, 2007
2 Replies
CoS is the classification of specific traffic (at layer 2) by manipulating the class of service bits (in the frame header). It effectively 'marks' the traffic so that QoS can use this identification/classification as a means to actually manipulate the traffic according to your policy. It is one way to identify traffic (along with ToS, ACLs, etc) so that QoS knows what to manipulate and how.
Here is a link to Cisco's QoS overview, and you can read about all of the ways to mark and prioritize/manipulate traffic:
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