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.
Laptop Battery 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.
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Thinkpad 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.
Core layer switches are usually the most powerful in your network, capable of higher throughput than any other switches in the network. Remember, everything we do on a Cisco router or switch has a cost in CPU or memory, so we're going to leave most frame manipulation and filtering to other layers. The exception is Cisco QoS, or Quality of Service. QoS is generally performed at the core layer. We'll go into much more detail regarding QoS in another tutorial, but for now, speed queuing where special consideration can be given to certain data in certain queues. (You'll soon find that this is a very basic definition!)
Microsoft 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!
To become a Cisco Certified Network Associate (CCNA), you must learn the hundreds of IOS commands used by Cisco routers and switches. This handy reference from Cisco networking authority Todd Lammle is just what you need to master those commands. From a thorough introduction to Ciscos basic operating system to making the transition to IPv6, Todd Lammle walks you through hundreds of commands with short, world examples.
Laptop Computers 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.
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Laptop Computer 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.
Cisco Systems, Inc., is the largest manufacturer of networking systems in the world. It dominates the router and switch market to the extent that Cisco routers and switches are considered by many networking professionals to set the standard for all other companies. Cisco routers, switches, and other equipment keep running without problems, are readily upgraded, are easily adapted to new network configurations, and are compatible with virtually every transport or access method.
Desktop Computer 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!
Notebooks 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.
Lenovo 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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