Source Class Usage

Source class usage (SCU) is a method of monitoring traffic in Juniper Networks routers. It extends the functionality of an existing accounting method called destination class usage (DCU). Like DCU, SCU gives you a way to define certain traffic as a group and monitor that group traffic using command-line interface (CLI) show commands, accounting profiles, or the Simple Network Management Protocol (SNMP). Instead of using the standard destination address lookup required by DCU, SCU performs the lookup on the source address. This functionality of SCU gives you greater flexibility in selecting which traffic to meter.

DCU commonly profiles traffic traveling from the customer edge to the provider core. SCU primarily tracks packets moving from the provider core to the customer edge.

This guide explains three methods of using SCU: setting up standard SCU for CLI monitoring, using SCU with Layer 3 VPNs, and establishing accounting profiles based on SCU source classes.

This feature guide covers these topics:

• Overview
• System Requirements
• Terms and Acronyms
• Configuring SCU
• SCU Configuration Example
• Configuring SCU with Layer 3 VPNs
• SCU with Layer 3 VPNs Configuration Example
• Configuring Accounting Profiles with SCU
• For More Information
• Revision History

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