68Chapter 3: Overview of QOS Support on Catalyst Platforms
From a platform perspective, the Catalyst 4000 CatOS Family of switches must be distin-
guished from the Catalyst 4000 Cisco IOS Family of switches due to individual differences
in QoS features and configuration. The supervisor engine model determines whether a
Catalyst 4000 switch operates on CatOS or Cisco IOS. In addition, the Catalyst 4000 Layer
3 services module also has exclusive Layer 3 QoS features (discussed in Chapter 7,
“Advanced QoS Features Available on the Catalyst 4000 IOS Family of Switches and the
Catalyst G-L3 Family of Switches”). Thischapter is only applicable to the ...
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