Medianet - Cisco Catalyst 6500-E Series Manual

Figure 22. Flexible NetFlow Operation
After the first packet, the NetFlow cache has one entry that is built based upon the primary fields (source IP,
destination IP, source port, destination port, Layer 3 protocol, and TOS byte) in the flow record definition. When
the second packet enters the system, the forwarding engine sees that it is identical to the first packet, so it simply
increments the packet count to 2 for the entry previously created in the NetFlow cache. When the third packet
enters the system, the forwarding engine builds a new entry in the NetFlow cache because the source IP address
has changed (although nothing else has).
After the flow exporters and flow records are defined, the next step is to define the flow monitor. Referring back to
Figure 21, notice that the flow monitor is simply the combination of the flow exporter and the flow record. It is
important to note that flow monitors can share exporters, can be applied in different directions (ingress or egress),
and can have multiple exporters per flow monitor. If the network administrator wants to turn on NetFlow sampling,
the flow monitor is where the sampler would be defined. With the Supervisor Engine 2T, all sampling is done in
hardware and provides the granularity to sample one packet out of a total pool of 2 to 32K packets.

Medianet

The introduction of new devices into the enterprise campus architecture as a result of BYOD means that there will
be more traffic with which existing applications will have to contend. Many organizations have made heavy
investments into video and collaboration infrastructures and need to make sure that these functions are not
degraded as a result of the increased traffic. Cisco Medianet is an end-to-end architecture for a network including
advanced, intelligent technologies and devices in a platform optimized for the delivery of rich-media experiences.
A medianet architecture helps IT organizations deliver the best possible user experience, with exceptional
efficiency, across a range of use cases.
As the primary component of the backbone of the unified access campus architecture, the Cisco Catalyst 6500-E
with Supervisor Engine 2T and Cisco IOS Software Release 15.0(1)SY and newer support many of the medianet
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