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Configuring Input SCU on the vt Interface of the Egress PE Router

To enable SCU in a Layer 3 VPN, configure source class usage on the virtual loopback tunnel (vt) interface of the egress PE router that is either configured for or equipped with a Tunnel PIC. The interface is equivalent to the inbound SCU interface, so use the input statement at the [edit interfaces vt-interface-number unit 0 family inet accounting source-class-usage] hierarchy level: