https://app.knowbase.one/vault/rfc/docid/3882
RFC3518: Point-to-Point Protocol (PPP) Bridging Control Protocol (BCP)
Network Working Group M. Higashiyama Request for Comments: 3518 Anritsu Obsoletes: 2878 F. Baker Category: Standards Track T. Liao ...
https://app.knowbase.one/vault/rfc/docid/5640
RFC5171: Cisco Systems UniDirectional Link Detection (UDLD) Protocol
Network Working Group M. Foschiano Request for Comments: 5171 Cisco Systems Category: Informational April 2008 Cisco Systems UniDirectional Link Detection (UDLD) Protocol Status...