[BCP130]   Best Current Practice 130,
              <https://www.rfc-editor.org/info/bcp130>.
              At the time of writing, this BCP comprises the following:

              Kompella, K. and B. Fenner, "IANA Considerations for
              OSPF", BCP 130, RFC 4940, DOI 10.17487/RFC4940, July 2007,
              <https://www.rfc-editor.org/info/rfc4940>.