Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-SNA Lines
Expand Configuration and Management Manual—523347-008
11-16
Profile Modifiers
Profile Modifiers
This subsection lists the recommended modifiers for Expand-over-SNA line-handler
processes and describes the modifiers provided for configuring special features. It also
describes default values and value ranges for all the modifiers contained in the
PEXQSNAM profile.
Recommended Modifiers
Recommended modifiers are modifiers that should be used to obtain optimum
performance and efficiency. The following modifier is recommended for Expand-over-
SNA line-handler processes:
L4TIMEOUT n
Default: 2000 (20 seconds)
Units: 0.01 seconds
Range: 500 through 32,767 (5.00 seconds through 5.27.67 minutes)
This modifier specifies the time interval, in one-hundredth of a second increments, that
the Expand-over-SNA line-handler process will wait for a response to an end-to-end
(Layer 4) request before retrying. L4TIMEOUT should be the same for every Expand
line-handler process in the network.
If a message is not acknowledged within the L4TIMEOUT period, an enquiry (ENQ) will
be initiated. Because retransmissions of an SNA network can degrade response time,
cause network link congestion, or result in excessive packet charges, you should set
L4TIMEOUT to a value in excess of the maximum anticipated response time on a
loaded link.
Modifiers for Special Features
The following modifiers are provided in the PEXQSNAM profile to enable you to
configure special features:
•
PATHBLOCKBYTES modifier for the multipacket frame feature
•
PATHPACKETBYTES modifier for the variable packet size feature
•
L4CONGCTRL_ON modifier for the congestion control feature
•
SUPERPATH_ON modifier for the Expand multi-CPU feature
For configuration considerations for these features, refer to Section 18, Subsystem
Description. For information about the advantages and disadvantages of these
features, refer to Section 3, Planning a Network Design.
Note. A different profile is provided for Expand-over-SNA lines that are part of a multi-line
path; this profile is described in Section 14, Configuring Multi-Line Paths.
Note. The Expand End-to-End protocol is explained in Path Function of the Expand
Subsystem on page 18-13.