2009-11-13 15:02:03
QoS Outline
The point of this post is to outline where I am headed in my studies. I have been reading three different books in regards to QoS and am starting to believe I have gotten off track on what I need to know for ONT. I’m not too worried about reading too much, but I am worried about retention and memorization for the test. So this post is an outline of what is covered in the ONT book, I will then backfill notes in different posts from all three books. My goal is to formalize my understanding of the topics and keep them in a logical order for when I go back through and start doing exam prep questions from the different books.

Chapter 2 — IP Quality of Service

QoS is affected by:

• Bandwidth
• Delay
• Jitter
• Packet Loss

QoS Models:

• Best-Effort
• IntServ
• DiffServ
  • DSCP
  • PHB

QoS Implementation:

• Command Line
• MQC — Cisco Recommended
• AutoQoS
• SDM QoS Wizard

Chapter 3 — Classification, Marking and NBAR

• Classification
  • Header fields for marking
  • Done through something like an ACL
• Marking
  • Setting fields in header
  • IP Header Fields
    • DSCP
    • Precedence
    • Lan CoS, 802.1Q ISL
• NBAR
• QOS Service Class
• Trust Boundaries

Chapter 4 — Congestion Management and Queuing

• FIFO
• PQ
• RR
• WRR
• WFQ
• CBWFQ
• LLQ

Chapter 5 — Congestion Avoidance, Policing, Shaping and Link Efficiency Mechanisms

• Congestion Avoidance
  • Tail Drop
  • RED
  • WRED
  • CBWRED
• Traffic Shaping and Policing
  • Measuring Traffic Rates
• Link Efficiency
  • L2 Compression
  • Header Compression
  • LFI

Chapter 6 — Implementing QoS Pre-Classify and Deploying End-to-End Qos

• VPN
• Pre-Classification
• Deploying End-to-End

Chapter 7 — Implementing AutoQoS

• Deploying AutoQoS
• Verifying AutoQoS
• Common AutoQoS problems
• Interpreting and Modifying AutoQoS