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

Expand Configuration and Management Manual — 529522-013
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13 Configuring Multi-Line Paths
The Expand multi-line path feature enables you to configure as many as eight lines
between the two adjacent nodes. The Expand subsystem can simultaneously transmit
data over all the lines in a multi-line path, thus increasing overall bandwidth, and will
automatically retransmit data over remaining lines if one or more lines fail. A multi-line
path can be part of a multi-CPU path.
This section explains how to configure the Expand multi-line path feature.
Configuration Overview
A multi-line path requires a logical device to manage the path function (called a path-
logical device
) and a separate logical device for each line in the path (called a line-
logical device
). Each line-logical device is associated with a path-logical device. The
path-logical device and the line-logical devices with which it is associated are regarded
as a single Expand line-handler process by the Expand subsystem.
Figure 13-1 shows the logical devices required for a multi-line path that consists of four
lines.
Note. For more information on the benefits and disadvantages of configuring multi-line paths,
see Section
3, Planning a Network Design.
Note. The path and line functions of an Expand line-handler process are described in detail in
Expand Subsystem and the OSI Reference Model on page 17-9.
Figure 13-1. Logical Devices for a Multi-Line Path
VST039.vsd
Line Logical Devices $PATH
$LINE1
$LINE2 $LINE3 $LINE4
Path Logical Device