Configure SCU and DCU for Layer 3 VPNs
For information on how to configure source class usage (SCU) for a Layer 3 VPN loopback interface, see the JUNOS Internet Software Configuration Guide: Network Management.
For information on how to configure SCU and destination class usage (DCU) to count packets on Layer 3 VPNs, see the JUNOS Internet Software Configuration Guide: Interfaces and Class of Service.