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Cisco AVVID Network Infrastructure Enterprise Quality of Service Design
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Chapter 1 Overview
Why is Quality of Service Required for AVVID?
Service-Provider QoS Requirements
End-to-end QoS is like a chain, which is only as strong as the weakest link. Therefore, it's essential for
enterprises to use service providers that can provide the service-level agreements required for AVVID
applications. For example, the end-to-end requirements of voice and video conferencing are:
·
No more than 1% loss
·
No more than 150 ms of one-way latency from mouth-to-ear (per ITU G.114 standard)
·
No more than 30 ms jitter
Thus, the service provider's component (a subset of the trip) must be considerably tighter, as shown
below and in
.
·
No more than 0.5% loss
·
No more than 60 ms of one-way latency from edge-to-edge
·
No more than 20 ms jitter
Figure 1-6
Service-Provider Service-Level Agreements Required for AVVID
To achieve such values, enterprises and service-providers must cooperate and be consistent in
classifying, provisioning and integrating their respective QoS solutions.
Maximum One-Way
Service-Provider
Service-Levels
Latency <= 60 ms
Jitter <= 20 ms
Loss <= 0.5%
Maximum One-Way Service-Levels
Latency < 150 ms / Jitter < 30 ms / Loss < 1%
Service Provider
Enterprise
branch
office
Enterprise
headquarters
74647
IP
IP