Cisco CCNP / BCMSN Exam Tutorial: Switches, QoS, And Cisco's Networking Model

QoS is a big topic on your BCMSN and CCNPappropriate distribution layer switches.Any traffic
exams, and for good reason. As more and morereceived by core switches should already be
traffic flows through today's networks, accuratelyclassified and marked as needed. The key with
applying QoS to both your routers and switchescore switches is to use a simple queuing setup to
becomes more important.Note the phrasekeep the switching process fast. Fast, fast,
"accurately applying". You must have a plan infast!Real-world note - Low Latency Queuing (LLQ)
place before you start configuring QoS on youris an excellent choice for core switches. The
switches, and to create such a plan you shouldname says it all - low latency! The configuration of
use Cisco's Three-layer Hierarchical Model.ThisLLQ is not a BCMSN topic, but a quick search on
model breaks switches down into three mainthe term low latency queuing will quickly bring up
groups - Access, Distribution, and Core. You'reseveral Cisco LLQ configuration
familiar with these groups from your CCNAdocuments.Knowing the three layers of Cisco's
studies, and now you've got to apply thisnetworking model and the basic QoS operation
knowledge.The QoS workload should be borne byand commands is vital to passing the CCNP
the Access and Distribution layers, because theexams, but even more importantly, you've got to
Core layer switches need to be left alone asapply this knowledge carefully and accurately to
much as possible to their primary purpose -make QoS work for you in today's production
switching!Traffic should generally be classified andnetworks.Chris Bryant, CCIE #12933, is the owner
marked at the Access layer. This allows traffic toof The Bryant Advantage, home of free CCNP
be assigned the desired QoS values and carryand CCNA tutorials, The Ultimate CCNA Study
that value throughout the network.If you choosePackage, and Ultimate CCNP Study Packages.You
to change CoS-DSCP mappings, this will generallycan also join his RSS feed and visit his blog, which
be done at the Distribution layer. Since distributionis updated several times daily with new Cisco
layer switches will be receiving frames andcertification articles, free tutorials, and daily CCNA
packets with QoS values from the access layerCCNP exam questions! Details are on the
switches, the appropriate "trust" and "no trust"website.
statements should be configured on the