Cisco CCNP / BCMSN Exam Tutorial: Switches, QoS, And Cisco’s Networking Model
QoS is a big topic on your BCMSN and CCNP exams, and for good reason. As more and more traffic flows through today’s networks, accurately applying QoS to both your routers and switches becomes more important.
Note the phrase “accurately applying”. You must have a plan in place before you start configuring QoS on your switches, and to create such a plan you should use Cisco’s Three-layer Hierarchical Model.
This model breaks switches down into three main groups – Access, Distribution, and Core. You’re familiar with these groups from your CCNA studies, and now you’ve got to apply this knowledge.
The QoS workload should be borne by the Access and Distribution layers, because the Core layer switches need to be left alone as much as possible to their primary purpose – switching!
Traffic should generally be classified and marked at the Access layer. This allows traffic to be assigned the desired QoS values and carry that value throughout the network.
If you choose to change CoS-DSCP mappings, this will...
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