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ITM Process Integrated Traffic Monitoring

Traffic Flow Data Collection

Information about traffic flows is captured at observation points. Observation points in the ITM

application are most often network interfaces. On platforms with RapidRoute enabled, RapidRoute

architecture behaves as additional observation points by noticing any IP packets not already classified in a

traffic flow. The following illustration depicts the operation of observation points within the ITM

architecture.

Figure 2. ITM Internal Process

Once traffic flows have been observed by an observation point, the observation point initializes a metering

process on the part of the flow cache.

Traffic Flow Data Sampling and Filtering

Sampling and filtering are two methods which provide a cross-section view of traffic flow while reducing

the amount of data collected and stored via ITM.

Sampling provides a snapshot of traffic flow activity. By reducing the amount of traffic flow data

collected, sampling minimizes memory and CPU usage. Sampling allows an interface to collect only one

of a specified number of IP packets that the interface is receiving or sending. To ensure an accurate

sampling of traffic flow patterns, the sampling method can be either random or fixed.

Filtering occurs by including an access control list (ACL) when ITM is enabled. By including an ACL in

ITM, undesired traffic can be filtered out of the accumulating traffic flow data. For example, all traffic to a

Web server could be filtered out if the monitoring focus is on abnormal traffic activity.

To further reduce the amount of traffic flow data collected, sampling can be used in conjunction with an

ACL. In this case, fewer data packets are inspected because of sampling, and the packets inspected are

filtered through the ACL for further reduction.

Network Interface/

Observation Point:

Collects traffic flow

information

Metering Process: Records

traffic flows and creates traffic

flow entries

Flow Cache: Stores traffic

flow entries until expiration

Export Process:

Exports expired traffic flow

entries to the external data

collector

Traffic flow data sent to

external data collector

IP Packet Traffic

AOS Product

Top Traffic Collector:

Captures a snapshot of

traffic flow statistics

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