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Integrated Traffic Monitoring ITM Process

Traffic Flow Data Metering

The AOS product’s flow cache monitors the traffic flow information. It collects IP header information,

organizes the packets into traffic flows, and determines when traffic flows have expired and are ready for

export. Once the ITM flow cache has been notified by the network interface (observation point), it

organizes the traffic flows into flow entries and determines when the entries will be exported to the

external data collector.

Traffic Flow Data Storage

Traffic flow entries are stored in the flow cache until they expire. Entry expiration occurs in one of three

ways: (1) the configured expiration time has passed; (2) the Transmission Control Protocol (TCP)

connection between the cache and the flow collector has expired due to FINISH/RESET signaling; or

(3) critical configuration changes have been made (for example, changing the sampling rate). The default

mode of expiration is based on a configured number of minutes (default is 30 minutes) for the traffic flow

entry to be stored in the cache.

Traffic Flow Data Collection

There are a couple of options with regard to traffic flow data collection. Traffic flow data can be sent either

to an external collector, collected internally through Top Traffic, or both.

Traffic Flow Data Export to External Collector

Once the traffic flow entries have expired, they are ready for export. When exporting traffic flow data,

there are multiple types of information sent to the external flow data collector. There is data information

about each traffic flow, as well as system information about each traffic flow, and the traffic flow record

itself. The information about the traffic flow record is called a template. Templates are used to describe the

types and lengths of individual header fields within a traffic flow data record, and communicate to the

external data collector what type of information to expect in the ITM flow record. The following tables

describe the information contained in each template.

External Data Collectors provide a more detailed view of traffic flow entries, but are not

required for ITM to function. Collected data may be sent to an external collector for more

detailed information, or sent through ITM’s internal Top Traffic data collector for general

usage overviews. ITM’s Top Traffic feature is detailed on page 7 of this guide.

Table 1. Data Template Information

Ingress Data Template Egress Data Template

Source IP Address Source IP Address

Destination IP Address Destination IP Address

Transport Protocol Type Transport Protocol Type

Source Port Source Port

Destination Port Destination Port

1 2 3 4 5 6 7 8 9 10 ... 49 50

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