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Cisco AVVID Network Infrastructure Enterprise Quality of Service Design
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C O N T E N T S
About this Document
xi
Intended Audience
xi
Document Organization
xi
Document Conventions
xii
Obtaining Documentation
xiii
World Wide Web
xiii
Documentation CD-ROM
xiii
Ordering Documentation
xiii
Documentation Feedback
xiii
Obtaining Technical Assistance
xiv
Cisco.com
xiv
Technical Assistance Center
xiv
Cisco TAC Web Site
xv
Cisco TAC Escalation Center
xv
C H A P T E R
1
Overview
1-1
Why is Quality of Service Required for AVVID?
1-1
Understanding QoS
1-1
Loss
1-2
Delay
1-3
Delay Variation
1-3
Quality of Service Requirements for Voice
1-3
Voice Traffic
1-4
Voice Control Traffic
1-5
Quality of Service Requirements for Video
1-6
Streaming Video
1-6
Video conferencing
1-7
Quality of Service Requirements for Data
1-7
Relative Priority vs. Over-Engineering Bandwidth Provisioning
1-8
Determining the Classes of Data Traffic
1-9
Provisioning for Important Data Traffic
1-9
Reactive vs. Proactive Policies
1-10
Non-Technical QoS Considerations of Data
1-10
Service-Provider QoS Requirements
1-11
