Material Presentation for Catalyst Switching Platforms 73
Material Presentation for Catalyst Switching Platforms
Figure 3-1 shows the general QoS packet-flow architecture for Cisco Catalyst switches. The
architecture presents only the standard model for QoS features on each Catalyst platform.
However, support for each feature of the architecture is platform dependent and varies
significantly for each Catalyst switch.
For each Catalyst platform, this book discusses QoS features using the following flowchart:
• QoS Architecture Overview
• Input Scheduling
• Classification and Marking
• Policing
• Congestion Management and Avoidance
• Sample Configurations and Case Studies
• Summary
As indicated in the Tables 3-1 through 3-5, not every Cisco Catalyst platform supports all
the QoS components and features. For those platforms, the QoS component is omitted or
discussed as an unsupported feature. Chapter 10, “End-to-End QoS Case Studies,”
concludes with comprehensive case studies using several Cisco Catalyst switches and QoS
features.
Cisco Catalyst Platform
Output
Scheduling Scheduling Queues
Catalyst 4000 CatOS Family Yes 2q1t
Catalyst 4000 Cisco IOS Family
(Supervisor III and IV)
Yes 1p3q1t, 4q1t
Catalyst 5500 w/NFFC II Yes 1q4t
Catalyst 6500 Yes Ingress: 1q4t, 1p1q4t, 1p1q, 1p2q1t
Egress: 2q2t, 1p2q2t, 1p3q1t, 1p2q1t,
1p1q8t, and 1p1q0t
Table 3-5 Catalyst Platform Congestion Management Support (Continued)
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