Flow Monitoring

The flow monitoring application performs traffic flow monitoring and enables lawful interception of packets transiting between two routers. Traffic flows can either be passively monitored by an offline router or actively monitored by a router participating in the network.

This feature guide covers the following topics:

• Overview

• Passive Flow Monitoring
• Active Flow Monitoring

• System Requirements
• Terms and Acronyms
• Configure Passive Flow Monitoring

• Hardware and Software Considerations
• Example: Passive Flow Monitoring Configuration
• Check Your Work
• Example: Flow Collector Interface Configuration
• Check Your Work

• Configure Active Flow Monitoring

• Example: Sampling Configuration
• Check Your Work
• Example: Sampling and Discard Accounting Configuration
• Check Your Work
• Example: Multiple Port Mirroring with Next-Hop Groups Configuration

• cflowd Output Formats
• For More Information
• Revision History