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Configuring APPN Services

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308963-14.00 Rev 00

Rapid Transport Protocol

RTP is a connection-oriented, full-duplex protocol that supports data in high-

speed networks at APPN NN endpoints. HPR uses RTP connections to transport

LU-LU and CP-CP traffic. A single RTP connection allows traffic from multiple

APPN sessions (requesting the same class of service) to share the same logical

“pipe.” This conserves network resources by minimizing the role of intermediate

NNs in the path, and by reducing error recovery and flow control operations.

Figure 1-9

illustrates an RTP connection supporting multiple sessions between

endpoint nodes over a logical pipe.

Figure 1-9. HPR RTP Connection Supporting APPN Sessions

RTP functions include:

• Non-disruptive path switching

• End-to-end error recovery

• End-to-end flow and congestion control

Non-Disruptive Path Switching

The HPR non-disruptive path switch dynamically reroutes RTP connections

around failed links or nodes. If a path fails, the RTP component at the NN

endpoint of the logical link calculates a new path based on the desired class of

service and transmission priority (if it exists). RTP performs the switching

transparently so that the session is unaware that rerouting is taking place.

Non-disruptive path switching forwards and reverses traffic to follow different

routes through the network, and also recovers traffic that was lost at the time of

failure.

RTP Connection

over Logical Pipe

Endpoint Node

Intermediate Node

Multiple

Sessions

Multiple

Sessions

APN0009A

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Avaya Configuring APPN Services Bedienungsanleitung Seite 34