400 Chapter 10: End-to-End QoS Case Studies
Although the configuration syntax differs, the Native IOS QoS features used in Example
10-7 are identical to the Hybrid CatOS and MSFC IOS configurations from Examples 10-5
and 10-6. The Native IOS configuration models the CLI from the Catalyst 3550 and
Catalyst 4500 Family of switches. Because both the Catalyst 6500s in Figure 10-1 use
identical line modules, both switches operate identically in all aspects of QoS.
Summary
This chapter reviewed some of the common QoS features applied to a sample campus
network topology. Many alternative configurations exist for campus network designs;
however, this chapter evaluated the common features in application. Although not explicitly
stated, this chapter highlighted the following QoS principles:
• As evident from the configurations, understanding packet flow and traffic profile is
essential to building any Campus QoS design and topology.
• Classification on access layer switch interfaces is viable using policy maps with ACLs
or trusting based on an attached Cisco IP Phone.
• Deploy reclassification and marking as needed throughout the campus to differentiate
service in more levels than possible with access layer switches.
• Use policers to restrict unwanted traffic flows such as Internet gaming and file sharing.
• Deploying WAN interfaces on Catalyst switches eases configuration and provides for
additional QoS features.
• Use a method of Priority Queuing when scheduling voice packets from transmit
queues.
• Carefully administer QoS maps to maintain desired queuing and scheduling behavior.
• Use congestion avoidance techniques on any interface where congestion is common.
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