Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-ATM Lines
Expand Configuration and Management Manual—523347-008
9-18
Recommended Modifiers
Recommended Modifiers
Recommended modifiers are modifiers that should be used to obtain optimum
performance and efficiency.
L4CONGCTRL_ON
Default: ON
Units: Not applicable
Range: ON or OFF
This modifier enables the congestion control mechanism. Because data transfer with
the UDP is not guaranteed, the Expand End-to-End protocol is used to achieve reliable
communications for Expand-over-ATM connections. You can avoid congestion and
improve error recovery by using the L4CONGCTRL_ON modifier. 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 9180 (9180 is recommended)
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-ATM
lines to increase the size of frames transmitted between neighboring nodes.
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
.
L4EXTPACKETS_ON
Default: ON
Units: Not applicable
Range: ON or OFF
This modifier is required for the variable packet size and congestion control features
(see L4CONGCTRL_ON and PATHPACKETBYTES n above). It is also required for
Expand line-handler processes that are part of multi-CPU path. The
L4EXTPACKETS_ON modifier is described in detail in Section 17, Expand Modifiers.