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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
Posted in Routing
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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
Posted in Routing, Uncategorized
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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
Posted in Routing
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HP vs. Cisco
I just read an article in the NY Times about the HP 3Com merger. Analysts were touting how HP ProCurve was going to battle Cisco for dominance in the data center. I believe that I am uniquely positioned to offer … Continue reading
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Congestion, Traffic Policing and Shaping
Note: There are two posts with similar titles and this being historical, more for people to see my progression I went ahead and added this one as well. There are three main quality of service concepts: congestion avoidance, traffic shaping … Continue reading
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QoS Implementation
2009-10-12 17:36:56 QoS Implementation Command Line: Not even the Cisco QoS Exam Certification guide covers the old command line configuration. Modular QoS Command Line (MQC): This tool separates classification of the traffic from the policy of the per hop behavior … Continue reading
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ChainRingCircus 