To ping a Layer 3 VPN, use the following command:
ping mpls l3vpn l3vpn-nameprefixprefix <count count>
Ping a combination of a IPv4 destination prefix and a Layer 3 VPN name on the destination PE Services Router to test the integrity of the VPN connection between the source and destination Services Routers. The destination prefix corresponds to a prefix in the Layer 3 VPN. However, ping tests only whether the prefix is present in a PE VRF table.