Configuring SCU with Layer 3 VPNs

SCU can be implemented over regular interfaces; it is also used in combination with Layer 3 VPNs. When you view SCU traffic on an ingress PE router, use the standard procedure outlined in Configuring SCU. However, when you enable packet counting for Layer 3 VPNs at the egress point of the MPLS tunnel, you need to take some additional steps. To configure SCU on the egress router in a Layer 3 VPN, perform the following steps:

• Configure Input SCU on the vt Interface of the Egress PE Router
• Map the SCU-enabled vt Interface to the VRF Instance
• Configure SCU on the Output Interface

SCU over Layer 3 VPNs is not supported when the vrf table label is configured. Also, SCU is not supported over Layer 2 VPNs.

To view examples of SCU with Layer 3 VPNs, go to the following sections:

• Example: SCU in a Layer 3 VPN Configuration
• Check Your Work