What is Rapid Transport Protocol?

Rapid Transport Protocol (RTP) is a transport layer protocol that provides the following benefits:

• Flow control.

• End-to-end error recovery.

• Selective retransmission of lost packets.

• Nondisruptive rerouting of sessions.

• Segmenting and reassembly of packets.

• Translation of APPN to HPR protocols (boundary function) for sessions that have both HPR and non-HPR portions.

• Translation of subarea to HPR protocols for sessions that have subarea and HPR portions. This translation is limited to routes that have a: (1) Non-HPR VR-based TG adjacent to an HPR route, (2) Subarea portion adjacent to a one-hop HPR route where the HPR endpoints are an interchange node and an adjacent APPN node.

At LU-LU session establishment, if a node providing the RTP function determines that at least some portion of the session route traverses one or more HPR-capable links and eventually terminates in another RTP node, it will establish an RTP connection between the two RTP nodes.

High Performance Routing (HPR) uses an RTP connection to transport session traffic between session endpoints.

To enable RTP-level HPR support on a VTAM node, specify the start option HPR=RTP.