Monthly Archives: November 2009

QoS Outline

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 … Continue reading

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Congestion Management and Queuing

Definitions: Tail drop — When a queue becomes full and new packets are dropped. Speed mismatch— The incoming interface speed exceeds the outgoing interface speed. Aggregation problem — The traffic from many interfaces aggregates into one interface that does not … Continue reading

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Congestion, Link Efficiency, Traffic Policing and Shaping

There are three main quality of service concepts: congestion avoidance, traffic shaping and policing, and link efficiency mechanisms. Congestion Avoidance: Tail Drop Tail drop causes problems with the network because it is not “smart” in how it deals with dropping … Continue reading

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QoS Pre-Classify and End-to-End QoS

Qos Pre-Classify The point of the qos pre-classify command is to be able to read and manipulate the IP header of a packet going through a VPN. The problem is that when a packet enters a VPN it is encrypted, … Continue reading

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AutoQoS

Auto QoS has two versions AutoQoS VOIP for switches and routers which was developed first to deploy QoS without the need for QoS experience. The second is AutoQoS Enterprise, is for routers only and requires a two step deployment process. … Continue reading

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QoS Models

There are three QoS Models: Best-Effort Integrated Services Model Differentiated Services Model Best-Effort Delivery/FIFO: Switches and routers work to deliver packets as quickly as possible with no regard for the type of traffic or need for priority. There is no … Continue reading

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Flashcards

For both of those people who read my blog regularly, hi Mom, I want to say that I have not really been slacking. I have been typing up flashcards for the iPhone. I downloaded a number of flashcard apps for … Continue reading

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