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8-5
Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 8 Quality of Service
WAN QoS Model
Figure 8-2 Provisioning a Converged Network
WAN QoS Tools
This section discusses the tools used to implement QoS for IP telephony
applications over the enterprise WAN. These tools include traffic prioritization,
link fragmentation and interleaving (LFI), and traffic shaping. This section
concludes with a summary of best practices for each of the applicable data link
protocols.
Traffic Prioritization
In choosing from among the many available prioritization schemes, the major
factors to consider include the type of traffic being put on the network and the
wide area media to be traversed. For multiservice traffic over an IP WAN, Cisco
recommends low-latency queuing for low-speed links. This allows up to 64 traffic
classes with the ability to specify, for example, priority queuing behavior for
voice and interactive video, a minimum bandwidth for Systems Network
Architecture (SNA) data and market data feeds, and weighted fair queuing to
other traffic types.
Video
0.75 x link capacity
Link capacity
Voice
Ctrl
SNA
Routing
etc.
Voice
Data
40820
Bandwidth Provisioning
BW = (Min BW for Voice + Min BW for video + Min BW for Data) /0.75
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