What Is EIGRP’s Reliable Transport Protocol (RTP)?
EIGRP doesn’t use TCP or UDP to deliver its packets. Instead, it uses its own purpose-built delivery mechanism called Reliable Transport Protocol (RTP) — not to be confused with the unrelated Real-time Transport Protocol used in VoIP and streaming, which shares the same acronym but nothing else. EIGRP’s RTP is what guarantees Update, Query, and...
