Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-12
$NCP Layer Functions
The End-to-End protocol is described in Path Function of the Expand Subsystem on
page 18-13.
$NCP Layer Functions
As shown in Figure 18-2, $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 the following 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