Expand Configuration and Management Manual (G06.24+)

Configuring Multi-Line Paths
Expand Configuration and Management Manual—523347-008
14-2
Configuration Considerations
Configuration Considerations
Consider the following when configuring a multi-line path:
•
You can configure a maximum of eight lines in a multi-line path.
•
The lines in a multi-line path can be all the same type (for example, all dedicated),
or they can be any combination of dedicated lines, X.25 connections, and SNAX
connections. You cannot mix satellite-connect, Expand-over-ATM, and Expand-
over-IP lines with other line types.
•
Expand-over-ServerNet and Expand-over-FOX connections cannot participate as a
member of a multi-CPU path (superpath).
•
A path-logical device and the line-logical devices with which it is associated must
be configured in the same processor pair.
•
A multi-CPU path that consists of Expand-over-IP lines can achieve better
throughput than a multi-line path that consists of Expand-over-IP lines. For more
information about multi-CPU paths and Expand-over-IP, refer to When to Use a
Multi-CPU Path on page 3-10.
•
For multi-line paths, the configured line speed, the packet size, and the DELAY
parameter (if applicable) are used to calculate when an outgoing packet will arrive
at the other side. This calculation is then used to select the best line for data
transmission. The line speed is configured using the same parameters used to set
the time factor for the line, but with different priorities. For this purpose SPEEDK
overrides SPEED, which overrides LINETF, then RSIZE. Regardless of how the
time factor is calculated, SPEED will be based on the resulting time factor using
the formula:
SPEED = 224000 / (time_factor_of_line)
•
When PathTF is set for a multi-line path, the line state and number of lines in the
path are ignored and the PathTF setting is a constant value assigned to the time
factor for the path. See PATHTF
n on page 17-20 for more information about this
recommended setting.
Summary of Configuration Steps
Configuring and starting a multi-line path involves the following steps:
Task Tool Used
Step 1: Create a Profile for the Path-Logical Device
SCF interface to the WAN subsystem
Step 2: Create a Profile for Each Line Type
SCF interface to the WAN subsystem
Step 3: Create a Path-Logical Device
SCF interface to the WAN subsystem