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Answer Upon - Cisco CCNP / BCMSN Exam Tutorial: Switches, QoS, And Cisco's Networking Model
From our deconstruction of hundreds of Hollywood blockbusters and an overview of Steven Spielberg's material - from Schindler's List to Jurassic Park, this man sticks to the Hero's Journey Template....The Hero's Journey is the template upon which the vast m
Any traffic received by core switches should already be classified and marked as needed. The key with core switches is to use a simple queuing setup to keep the switching process fast. Fast, fast, fast!
Re
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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 generally be done at the Distribution layer. Since distribution layer switches will be receiving frames and packets with QoS values from the access layer switches, the appropriate "trust" and "no trust" statements should be configured on the appropriate distribution layer switches.
Any traffic received by core switches should already be classified and marked as needed. The key with core switches is to use a simple queuing setup to keep the switching process fast. Fast, fast, fast!
Re
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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 generally be done at the Distribution layer. Since distribution layer switches will be receiving frames and packets with QoS values from the access layer switches, the appropriate "trust" and "no trust" statements should be configured on the appropriate distribution layer switches.
Any traffic received by core switches should already be classified and marked as needed. The key with core switches is to use a simple queuing setup to keep the switching process fast. Fast, fast, fast!
Re
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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 generally be done at the Distribution layer. Since distribution layer switches will be receiving frames and packets with QoS values from the access layer switches, the appropriate "trust" and "no trust" statements should be configured on the appropriate distribution layer switches.
Any traffic received by core switches should already be classified and marked as needed. The key with core switches is to use a simple queuing setup to keep the switching process fast. Fast, fast, fast!
Re
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If you choose to change CoS-DSCP mappings, this will generally be done at the Distribution layer. Since distribution layer switches will be receiving frames and packets with QoS values from the access layer switches, the appropriate "trust" and "no trust" statements should be configured on the appropriate distribution layer switches.
Any traffic received by core switches should already be classified and marked as needed. The key with core switches is to use a simple queuing setup to keep the switching process fast. Fast, fast, fast!
Re
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Any traffic received by core switches should already be classified and marked as needed. The key with core switches is to use a simple queuing setup to keep the switching process fast. Fast, fast, fast!
Real-world note - Low Latency Queuing (LLQ) is an excellent choice for core switches. The name says it all - low latency! The configuration of LLQ is not a BCMSN topic, but a quick search on the term low latency queuing will quickly bring up several Cisco LLQ configuration documents.
Knowing the three layers of Cisco's networking model and the basic QoS operation and commands is vital to passing the CCNP exams, but even more importantly, you've got to apply this knowledge carefully and accurately to make QoS work for you in today's production networks.
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