October 2002
Intermediate to advanced
560 pages
12h 13m
English
Content preview from Cisco® Field Manual: Catalyst® Switch ConfigurationBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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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