Classes, Scheduling, Policing, and Shaping - Quality of Service (Part 3)
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3 سال پیش
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This video will look at
This video will look at how we can take our markings, and take action on each traffic class!
When traffic is classified, it is put into a class. This means that traffic is grouped together based on similar requirements. Technically, this is done per device, so each device needs to be configured correctly. This is called Per Hop Behaviour (PHB). Once traffic is classified, the packets are added to a queue. More important queues are serviced more often. We can configure how much bandwidth to allocate to each queue.
Policing is a QoS tool that sets a hard limit on the amount of bandwidth a class can use. Anything above this limit is non-conforming, and is dropped.
Shaping is similar to policing. However, non-conforming traffic is not immediately dropped, but added to a queue. When bandwidth is available, the packets can be sent out. If the queue is filled up, then the packets will tail-drop.
RED (Random Early Detection) uses TCP to help congestion. As a queue starts to fill up, a TCP packet is dropped. This causes the sender to shrink the window size, and slow down. Weighted RED (WRED) is clever, as it will drop packets from less important queues more often than the important ones.
Overview of this video:
0:00 Introduction
0:19 Classes and Schedulers
5:28 Policing
7:59 Shaping
10:06 RED and WRED
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