Enterprise QoS Solution Reference Network Design Guide

QoS Design Overview
Version 3.3
Campus QoS Design
CHAPTER
This chapter includes the following topics:
QoS Design Overview
Catalyst 2950—QoS Considerations and Design
Catalyst 3550—QoS Considerations and Design
Catalyst 2970/3560/3750—QoS Considerations and Design
Catalyst 4500 Supervisor II+/III/IV/V—QoS Considerations and Design
Catalyst 6500 PFC2/PFC3—QoS Considerations and Design
WAN Aggregator/Branch Router Handoff Considerations
This section includes the following topics:
Where is QoS Needed in a Campus?
DoS/Worm Mitigation
Call Signaling Ports
Access Edge Trust Models
Cisco IP Phones
WAN Aggregator/Branch Router Connections
Where is QoS Needed in a Campus?
Enterprise QoS Solution Reference Network Design Guide
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The case for Quality of Service (QoS) in WANs/VPNs is largely self-evident because of its
low-bandwidth links compared to the high-bandwidth requirements of most applications. However, the
need for QoS is sometimes overlooked or even challenged in high-bandwidth Gigabit/TenGigabit
campus LAN environments.
Although network administrators sometimes equate QoS only with queuing, the QoS toolset extends
considerably beyond just queuing tools. Classification, marking and policing are all important QoS
functions that are optimally performed within the campus network, particularly at the access layer
ingress edge (access edge).
Three important QoS design principles are important when deploying campus QoS policies:
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