Prerequisites for QoS
Before configuring standard Quality of Service (QoS), you must have a thorough understanding of these items:
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Standard QoS concepts.
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Classic Cisco IOS QoS.
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Modular QoS CLI (MQC).
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Understanding of Virtual Output Queuing (VOQ) architecture.
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The types of applications used and the traffic patterns on your network.
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Traffic characteristics and needs of your network. For example, is the traffic on your network bursty? Do you need to reserve bandwidth for voice and video streams?
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Bandwidth requirements and speed of the network.
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Location of congestion points in the network.