Flow Monitoring and Discard Accounting Overview

Using a Juniper Networks M-series router, a selection of PICs (including the Monitoring Services PIC or Adaptive Services PIC and other networking hardware, you can monitor traffic flow and export the monitored traffic. Monitoring traffic allows you to do the following:

• Gather and export detailed information about IPv4 traffic flows between source and destination nodes in your network.
• Sample all incoming IPv4 traffic on the monitoring interface and present the data in cflowd record format.
• Perform discard accounting on an incoming traffic flow.
• Encrypt or tunnel outgoing cflowd records, intercepted IPv4 traffic, or both.
• Direct filtered traffic to different packet analyzers and present the data in its original format (port mirror).

This section provides general information on the following topics:

• Passive Flow Monitoring
• Active Flow Monitoring
• Complete Monitoring Services Interface Configuration Hierarchy