QoS Part II (Advanced)
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For more information on Network Management , visit: http://www.solarwinds.com/network-management-software.aspx Watch this webcast: http://www.solarwinds.com/resources/webcasts/qos-live-part-2.html Quality of Service (QoS) is back by popular demand! Part II of our Webcast series on QoS is a more technical, deeper dive into this technology. This webcast covers: • A quick refresher on QoS • Traffic shaping • Scheduling and queuing algorithms • Congestion avoidance Cisco's Class-Based Quality of Service or CBQoS It’s hard to imagine a network in today’s world that doesn’t or couldn’t benefit from implementing some form of QoS. Watch this webcast and learn some of the things you need to know in order to successfully implement, manage, and monitor QoS on your network.
![SOLARWINDS CONFIDENTIAL Geek Speak: QoS Part II Geek Speak Webcasts are created and sponsored by SolarWinds. If you are not a SolarWinds customer, it is recommended that you download 30-Day Trial evaluations of the products mentioned during the webcast. This will ensure a better understanding of the material being presented. SolarWindsTrials to Download for QoS Part II: ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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QoS Part II (Advanced)
- 3. Orion IP SLA Manager: Download Now>>Link: Orion NPM) (Link Orion IP SLA Manager )
- 4. A big “Howdy” from SolarWinds based in Austin, Texas Josh Stephens - Head Geek, Monster Blogger, Constant Tweeter Chris LaPoint – Senior Product Manager Today’s Topic: Quality of Service (QoS) – Part II Who is SolarWinds? What we do… Who are our customers? The SolarWinds community… Introduction
- 6. If not, use the WebEx Q&A panel to contact the moderator
- 7. How do you win the free stuff?
- 8. How do you ask questions?
- 10. Traffic Shaping
- 11. Scheduling and Queuing Algorithms
- 12. T-shirt Giveaway
- 14. Cisco’s Class Based Quality of Service (CBQoS)
- 15. Using Orion to monitor QoS
- 17. It is not a measure of achieved quality or a guarantee of quality.
- 18. It is a workaround for congestion.
- 19. It’s especially important with latency sensitive applications.
- 20. QoS may be referred to as:
- 21. DSCP
- 22. ToS
- 24. Anytime you have worry of congestion
- 25. If you have latency sensitive and latency insensitive traffic on the same links
- 26. As an alternative to buying more bandwidth
- 27. Tips for implementing QoS
- 28. Don’t be afraid – it isn’t as hard as it sounds
- 29. Leverage templates provided by the hardware vendors (Cisco SBA for instance)
- 32. Rate Limiting
- 33. GCRA (Generic Cell Rate Algorithm)* More complete definition at wikipedia.org
- 36. Policing (discarding excess packets)
- 37. Queuing (delaying packets in transit)
- 41. Class Based Weighted Fair Queuing
- 43. Deficit Weighted Round Robin
- 45. Traffic flows into the queue at variable rates
- 46. Traffic always flows out of the queue at the same rate
- 47. Doesn’t allow for bursting even when there’s available bandwidth
- 49. A token is added to the bucket every 1 / r seconds.
- 50. The bucket can hold at the most b tokens. If a token arrives when the bucket is full, it is discarded.
- 51. When a packet (network layer PDU) of n bytes arrives, n tokens are removed from the bucket, and the packet is sent to the network.
- 53. To calculate the time for which the Token Bucket Algorithm allows burst of maximum possible size, assume that the capacity of the Token Bucket is C bytes, the token arrival rate is R bytes/second and the maximum possible transmission rate is M bytes/second and S is the number of seconds for which it is possible to transmit at maximum rate.
- 54. Then, the following equality holds C + R * S = M * S which gives S = C / (M − R) seconds
- 57. Class Based Weighted Fair Queuing
- 59. Deficit Weighted Round Robin
- 61. Policing
- 63. Active queue management algorithm (also a congestion avoidance algorithm)
- 65. Treats bursty traffic fairly – more fair than tail drop
- 66. Makes QoS differentiation impossible
- 67. WRED
- 68. Extension to RED
- 69. Each queue has different queue thresholds associated to different IP precedence
- 71. Actively makes changes to enforce the contract
- 72. May apply traffic shaping
- 74. End-to-end notification of network congestion
- 75. Only used with both endpoints signal they want to use it
- 76. Can be used to avoid packet drops
- 80. How it’s different from regular QoS methods
- 81. It’s dynamic
- 82. Automatically adjusts queue sizes
- 83. Automatically adjusts application responses
- 85. - Slide 23 - Monitoring CBQoS
- 87. Orion IP SLA Manager: Download Now>>Link: Orion NPM) (Link Orion IP SLA Manager )
- 88. Summary and Q&A Thank you for attending! To learn more or to download free 30-day trials of SolarWinds products visit: www.SolarWinds.com Contact information Josh Stephens, Head Geek headgeek@solarwinds.com twitter: sw_headgeek Blog: http://thwack.com/blogs/geekspeak/ p.s. Remember to renew your maintenance!!!