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Cisco QOS Exam Certification Guide (IP Telephony Self-Study), Second Edition by Michael J. Cavanaugh, Wendell CCIE No. 1624 Odom

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Appendix D. LAN QoS Reference

“Why would I go through the hassle of configuring and managing QoS on my LAN, which is already overprovisioned? If I have to, I will just add more bandwidth!”

This is a common statement. Conventional wisdom dictates, “If you have enough bandwidth, you do not need QoS. QoS is only used for WAN links that do not have enough bandwidth. LANs have plenty of bandwidth, so you are safe.”

Although this sounds reasonable, it is not entirely accurate. Bandwidth is only one of the factors that need to be taken into consideration for a network that supports real-time applications.

This chapter discusses the capabilities of Cisco Catalyst LAN switches and examines some recommended configurations designed to prioritized real-time ...

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