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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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13-1. QoS Theory

  • QoS defines policies on how switches and routers deliver different types of traffic. A QoS domain is the entire collection of network devices that are administered so that they adhere to the QoS policies.

  • To guarantee that QoS policies are met, QoS must be configured on all switches and routers end-to-end across the network.

  • Traffic should be classified at the edges of the QoS domain. Where this isn't possible, classify traffic as close as possible to the source. Classification can occur at Layer 2 or Layer 3, depending on the network functions available at the edge.

  • The top portion of Figure 13-1 shows QoS operations on a Catalyst switch, including the following:

    - Classification— Selects specific traffic to which a QoS policy can ...

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