Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-IP Lines
Expand Configuration and Management Manual—523347-008
8-29
Modifiers for Special Features
L4CONGCTRL is a path parameter and the path profile sets L4CONGCTRL_OFF
because it is shared by all line types. Therefore, multi-line IP paths default to
L4CONGCTRL_OFF and must specify L4CONGCTRL_ON.
The L4CONGCTRL_ON modifier is also recommended for Expand line-handler
processes that are part of a multi-CPU path.
You should read the description of the congestion control feature in Section 18,
Subsystem Description, before using this modifier. The L4CONGCTRL_ON modifier is
described in detail in Section 17, Expand Modifiers.
PATHPACKETBYTES n
Default: 1024
Units: Bytes
Range: 0 or 1024 through 9152
This modifier enables the variable packet size feature and specifies the maximum size,
in bytes, of a variable packet. PATHPACKETBYTES can be used on Expand-over-IP
lines to increase the size of frames transmitted between neighboring nodes. It should
be set to 9152 for best performance.
You should read the description of the variable packet size feature in Section 18,
Subsystem Description, before using this modifier. The PATHPACKETBYTES modifier
is described in detail in Section 17, Expand Modifiers.
Modifiers for Special Features
In addition to the L4CONGCTRL_ON and PATHPACKETBYTES modifiers, the
SUPERPATH_ON modifier is provided in the PEXQSIP profile to enable you to
configure the Expand multi-CPU feature.
For configuration considerations for all special features, refer to Section 18, Subsystem
Description. For information about the advantages and disadvantages of each feature,
refer to Section 3, Planning a Network Design
.
The PATHBLOCKBYTES, PATHPACKETBYTES, L4CONGCTRL_ON, and
SUPERPATH_ON modifiers are described in detail in Section 17, Expand Modifiers
.
PEXQSIP Modifiers
The disk file $SYSTEM.SYSnn.PEXQSIP defines modifiers for single-line Expand-
over-IP line-handler processes.
Table 8-1 lists the default value and range of values for each modifier in this profile, if
applicable. For modifiers that are mutually exclusive, a check mark (3) is shown in the
“Default Value” column to indicate which modifier is present in the profile. For a
complete description of the modifiers listed in this table, refer to Section 17, Expand
Modifiers.