Medianet Reference Guide - Cisco

Cisco Network Analysis Module
Chapter 6
Medianet Management and Visibility Design Considerations
Figure 6-12
Traffic Statistics per Service Class from an NDE Source
The example above shows the breakout of traffic flows from a campus core to a WAN edge switch (as
shown in Figure 6-1). This level of traffic analysis may be used to assist in determining whether the
provisioning of traffic on existing WAN policy maps is appropriate for the actual traffic levels that cross
the WAN interfaces. Policy maps on Cisco IOS router platforms are often configured to allow
applications to exceed the allocated bandwidth for a particular service class, if available bandwidth
exists on the WAN link. Therefore, just because no drops are being seen on a particular service class on
a WAN link, does not mean the provisioned bandwidth is sufficient for the traffic within that service
class. The service class may be borrowing from other service classes. Visibility into the amount of actual
traffic flows per service class can help ensure that you allocate the appropriate amount of bandwidth per
service class.
You can drill down further into each service class to identify particular application flows, based on their
TCP or UDP port numbers. This is done through the Diffserv Application Statistics screen, as shown in
Figure 6-13.
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Medianet Reference Guide
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