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Configuring APPN Services

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308963-14.00 Rev 00

Intermediate Session Routing

Intermediate session routing (ISR) provides a reliable, connection-oriented,

LU-LU session path between nonadjacent APPN nodes. ISR session connectors

(SCs) and a session connection manager (SCM) forward sessions through the

intermediate network node (Figure 1-6

At session endpoints, the LU, with control point services, establishes a session

with a session partner and routes session data back and forth with the partner LU.

INTERMEDIATE network nodes do not control the LU endpoints, and LU

services cannot be invoked on these nodes. ISR forwards session data to the next

node along the session path.

Figure 1-6. Nonadjacent LU-LU Session Through an Intermediate Node

In Figure 1-6, LU-A and LU-C are nonadjacent session partners. ISR at NNB

forwards session data between the nonadjacent nodes, LU-A and LU-C. NNB

creates a session connector (SC) for each session passing through it.

Figure 1-7

illustrates ISR function placement in the SNA layered architecture.

Routing takes place at the SNA Layer 4, called the Transmission Control layer.

Layer 4 performs flow control operations, specifically segmentation and

reassembly, and pacing.

Network Node A

LU-a

ISR Services

Intermediate

Network Node B

NNB

LU-A to LU-C

Session

LU-A to LU-C

Session

End Node C

LU-C

APN0006A

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Avaya Configuring APPN Services Bedienungsanleitung Seite 30