Netflow Component for Tracking IPv4 Traffic

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NetFlow is a Cisco technology that provides visibility into network traffic flows by capturing and analyzing data about the traffic. NetFlow provides detailed information about the traffic flows, including the source and destination IP addresses, the amount of traffic, and the application and protocol used.

To apply NetFlow to an interface to track IPv4 traffic, you need to configure the following NetFlow components:

1. Flow record: A flow record is a definition of the fields that NetFlow will collect for each flow. The flow record includes information such as the source and destination IP addresses, the source and destination ports, the protocol, and the number of bytes and packets. You can configure a flow record using the "ip flow-export" command.

2. Flow exporter: A flow exporter is responsible for exporting the NetFlow data to a collector or analyzer. The flow exporter specifies the IP address and port number of the collector, the version of NetFlow to use, and the format of the exported data. You can configure a flow exporter using the "ip flow-export" command.

3. Flow monitor: A flow monitor is a combination of a flow record and a flow exporter. It defines the set of flows that will be monitored and the data that will be collected and exported. You can configure a flow monitor using the "ip flow-monitor" command.

4. Flow sampler: A flow sampler is used to randomly sample a subset of the traffic passing through an interface. This can be useful for reducing the amount of data that needs to be collected and exported. You can configure a flow sampler using the "ip flow-sampler" command.

Therefore, to track IPv4 traffic on an interface using NetFlow, you would need to configure a flow record that includes the relevant fields for IPv4 traffic, configure a flow exporter to export the data to a collector, configure a flow monitor that combines the flow record and flow exporter, and optionally configure a flow sampler to sample the traffic. The component that can be applied to an interface to track IPv4 traffic is the flow monitor.