Jeng, H., Uttaro, J., Jalil, L., Decraene, B., Rekhter, Y., and R. Aggarwal, "Virtual Hub-and-Spoke in BGP/MPLS VPNs", RFC 7024, DOI 10.17487/RFC7024, October 2013, <https://www.rfc-editor.org/info/rfc7024>.