Avaya Configuring APPN Services Bedienungsanleitung PDF herunterladen (Seite 32)

Configuring APPN Services

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To specify the maximum size of the adaptive pacing window, configure the ISR

Receive Pacing Window parameter.

High Performance Routing

APPN’s high performance routing (HPR) increases data routing performance and

reliability. HPR allows high-speed forwarding in intermediate nodes at the Data

Link Control layer (Layer 2) of SNA, operating much faster than the intermediate

session routing (ISR) base component in APPN. HPR consumes fewer network

resources (memory and control processor) by

• Minimizing storage and processing activities in intermediate nodes

• Reducing the amount of error recovery on individual lines

• Implementing nondisruptive path switching function that reroutes sessions

around failed links or nodes

HPR uses the Rapid Transport Protocol (RTP) and Automatic Network Routing

(ANR). RTP also supports adaptive rate based (ARB) congestion control.

Figure 1-8

illustrates HPR in the SNA layered architecture. Routing takes place at

the SNA Data Link Control layer. Layer 2 performs reliable, sequential delivery,

selective retransmission, and nondisruptive rerouting using RTP, as described in

this section.

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Avaya Configuring APPN Services Bedienungsanleitung Seite 32