Expand Configuration and Management Manual (H06.21+, J06.10+)

Subsystem Description
Expand Configuration and Management Manual — 529522-013
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$NCP Layer Functions
$NCP Layer Functions
As shown in Figure 17-2 on page 17-9, $NCP provides some functions of both the OSI
Transport and Network Layers.
$NCP at the OSI Transport Layer
$NCP provides part of the OSI Transport Layer function because it monitors processor
UP and DOWN notifications.
$NCP at the OSI Network Layer
$NCP provides these OSI Transport Layer functions:
•
Maintaining network routing information
•
Calculating the most efficient way to transmit data to other nodes in the network
•
Exchanging routing information with $NCPs at neighbor nodes
•
Grouping the Expand line-handler processes in a multi-CPU path to a particular
neighbor node