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

Configuring Multi-Line Paths

Expand Configuration and Management Manual — 529522-013

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Configuration Considerations

Consider these 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.

•

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 on the multi-CPU paths and Expand-over-IP, see When to Use a Multi-

CPU Path on page 3-9.

•

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. For more information on this recommended setting, see

PATHTF n on page 16-20.