tp4config(8) CLIX tp4config(8)
NAME
tp4config - Configures ISO/OSI TP4 (transport layer) parameters
SYNOPSIS
tp4config [-arg value] [-arg value] ...
FLAGS
-inactivity time
Inactivity time; the amount of time that TP4 maintains a Transport
connection without any data transmission before it terminates the
connection. If this argument is not specified, it defaults to the
value derived from the product of the current retransmit count (-n
argument) and the window size (-window argument).
-retransmit time
The amount of time that TP4 initially waits without receiving an
acknowledgment of a TPDU it sent before it retransmits the TPDU.
(The maximum number of times the same TPDU can be transmitted can
be specified with the -n option.) TP4 automatically adjusts the
value of this parameter individually for each connection based on
the performance of the network. If this argument is not specified,
it defaults to 2,000 (2 seconds).
-upper time
Upper bound of the retransmit timer; the largest value to which TP4
can set the retransmit time. If this argument is not specified, it
defaults to 10,000 (10 seconds).
-lower time
Lower bound of the retransmit timer; the smallest value to which
TP4 can set the retransmit time. If this argument is not
specified, it defaults to 16 (16 milliseconds).
-window time
Window timer value; the period of inactivity that can occur before
TP4 sends a hello packet to the peer entity with which a connection
is established. If you do not include this argument, its value
defaults to 20,000 (20 seconds).
-ack time
Local acknowledgment delay; the maximum amount of time TP4 can
delay acknowledgment of a TPDU it receives. If you do not include
this argument, its value defaults to 112 (0.1 seconds).
-flow time
If TP4 has no receive credit available, it checks the available
resources every time milliseconds until credit becomes available.
If you do not include this argument, its value defaults to 112 (0.1
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tp4config(8) CLIX tp4config(8)
seconds).
-n iterations
Maximum number of times a TPDU can be sent without being
acknowledged. If you do not include this argument, its value
defaults to 10.
-credit value
Maximum value to which TP4 can adjust the window size; that is, the
number of unacknowledged TPDUs that can be outstanding on a
connection. If you do not include this argument, its value
defaults to 4.
-initial value
The initial window size when the connection is first established.
TP4 will adjust this value up to the maximum automatically. If you
do not include this argument, its value defaults to 2.
-maxtpdu value
Maximum size of a TPDU. It is recommended that you select one of
the following values: 128, 256, 512, 1,024, or 2,048 bytes. If you
do not include this argument, its value defaults to 1,024. If you
change the default, it is important that you ensure there are
sufficient STREAMS buffers of the appropriate size.
-checksum flag
If flag is a non-zero value, the TPDU checksum feature is enabled;
if zero, it is disabled. Enabling this feature slows down TP4
operation significantly. If you do not include this argument, its
value defaults to 0 (disabled).
-propose flag
If flag is a non-zero value, Transport proposes to use extended
TPDU sequencing when it initiates a connect request (CR) TPDU; if
zero, Transport proposes normal sequencing. If you do not include
this argument, its value defaults to 1 (enabled).
-extended flag
This flag is to set preferred use of extended sequence numbers.
-decca flag
If flag is a non-zero value, the DEC congestion avoidance flag is
enabled; if zero, the flag is disabled. If you do not include this
argument, its value defaults to 0 (disabled).
Keep in mind that the DEC congestion avoidance algorithm is
effective only if all end and intermediate systems in a network use
it. Refer to the National Institute of Standards and Technology
(NIST) Special Publication 500-162 for details on this algorithm.
DESCRIPTION
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tp4config(8) CLIX tp4config(8)
Sets the value for the specified TP4 configuration parameters, then
displays all parameter values. Note that all times are specified in
milliseconds.
EXAMPLE
The following example shows starting the tp4config command, and subsequent
text shows the command output:
$ tp4config -n 15 -upper 25000 -lower 50
Inactivity time: 400000
Initial retransmit timer: 2000
Upper bound on retransmit timer: 25000
Lower bound on retransmit timer: 50
Window timer value: 20000
Local acknowledgment delay: 100
Local flow control interval: 100
Max number of transmissions: 10
Target window size: 4
Initial window size: 1
Maximum TPDU size: 1024
Maximum TIDU size: 1016
Checksum enable: 0
Propose use of extended sequence numbers: 1
Prefer use of extended sequence numbers: 1
DEC Congestion avoidance enable: 0
Max number of transport connections (read/only): 32
DIAGNOSTICS
could not open device
Cause: the TP4/IP driver has not been installed.
Action: reinstall OSI/LAN software in the kernel.
tp4config: unknown parameter p
Cause: you specified an argument on the command line that was not
recognized.
Action: check the list of arguments , and reenter the command
line.
RELATED INFORMATION
Intergraph ISO/OSI Administrator's Guide
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