Supporting Routed GOOSE (R-GOOSE) Traffic over IP/MPLS Using Multicast VPNs

Substation Event messaging (R-GOOSE), which extends traditional Layer-2 GOOSE beyond the substation using routable IP multicast. This enables deterministic and secure exchange of protection and control signals across wide geographic areas, including between substations and field devices.

R-GOOSE places stringent demands on the underlying network, including deterministic lowlatency multicast delivery, scalable traffic distribution, fast recovery from failures, and strong cybersecurity controls. These requirements are increasingly critical as utilities manage rising system complexity driven by distributed energy resources (DERs) interconnections, widespread electric vehicle (EV) charging, and growing data-center loads.

IP/MPLS (Internet Protocol over Multiprotocol Label Switching) is a proven communications technology that utilities have been deploying to support mission-critical services for more than a decade. Its ability to transport legacy TDM and SDH/PDH traffic (typically for tele protection) alongside modern high-bandwidth applications makes it well suited for network convergence. IP/MPLS provides secure, scalable, and deterministic transport through welldefined quality-of-service mechanisms, including applications that require multicasting services. By extending Layer-3 VPN architectures to support multicast routing, multicast VPNs enable efficient replication, per-VPN traffic isolation, and predictable performance. Together,

IP/MPLS and mVPNs form a robust, scalable foundation for wide-area R-GOOSE while supporting regulatory compliance during the transition to converged packet networks.