Li, Z., Zhuang, S., Talaulikar, K., Ed., Aldrin, S., Tantsura, J., and G. Mirsky, "BGP - Link State (BGP-LS) Extensions for Seamless Bidirectional Forwarding Detection (S-BFD)", RFC 9247, DOI 10.17487/RFC9247, June 2022, <https://www.rfc-editor.org/info/rfc9247>.