This section describes the steps for tuning your DTC by selecting
the AFCP, TCP and management timers that are appropriate for your
DTC and network traffic. The timer selection is made by choosing
a set from a predefined set of timer values. The TCP timers are
only used for back-to-back connections from
switched DTC ports.
Figure 8-2 “Tune DTC — Timer Selection
Screen” displays the Tune
DTC — Timer Configuration screen. This screen is reached
by pressing [F2], the [Tune DTC]
function key at the DTC Configuration screen.
The Tune DTC - Timer Selection screen for host-based
management is shown below. The screen for PC-based management contains
only the AFCP timer selection. For PC-based management the TCP and
management timers are configured on the DTC OpenView workstation.
Figure 8-2 Tune DTC — Timer Selection
Screen
The DTC name
field is a display field and shows the name of the DTC you are currently
configuring.
Select one of six predefined sets of values for
AFCP timers. The default is selection 1.
Select one of five predefined sets of TCP timer
values. The default is 1.
Select one of two predefined sets of values for
management timer. The default is selection 1.
The management protocol timers determine different transmission
algorithms.
After you have selected the desired timer values,
press the [Save Data] key.
Press the [Prior Screen]
key to return to the DTC Configuration screen, or press [Validate DTS/LINK]
to validate your configuration if you have completed configuration
for your DTCs.
For host-based management, after you invoke dynamic configuration,
both host and DTC values will take effect once you logoff any sessions
or stop and restart the spooler associated with changed devices
and download the DTC. For PC-based management, only the host values
will take effect because the DTCs are managed by the OpenView DTC
Manager on the PC. You must use the OpenView DTC Manager to configure
and download the DTC timer values. In this case, you must ensure
consistency of timer selections between the host and the DTC during
configuration in NMMGR and OpenView DTC Manager.
Fields
- AFCP Timer Set 1
Normal timer mode. This selection is appropriate
for most users operating in a normal LAN environment.
- AFCP Timer Set 2
Short retransmission timer mode. This is appropriate
in a LAN environment where there is a high number (greater than
1%) of packets lost on the LAN. The values are adapted to provide
shorter retransmission values and higher number of retries.
- AFCP Timer Set 3
Long retransmission timer mode. This is appropriate
in a LAN environment where the LAN is very reliable. The values
are adapted to reduce LAN traffic and host driver overhead.
- AFCP Timer Set 4
Variable retransmission timer mode. This is appropriate
in exceptional cases where there is a very high percentage of lost
packets on the LAN. The values are adapted to prevent saturation
of the LAN.
- AFCP Timer Set 5
MPE XL release 1.2 timer mode. This is appropriate
for use with HP 3000 MPE XL FOS release 1.2.
- AFCP Timer Set 6
MPE XL release 2.1 timer mode. This is appropriate
for use with HP 3000 MPE XL FOS release 2.1.
- TCP Timer Set 1
Normal timer mode. For local transaction processing
applications and Telnet connections on local LAN.
- TCP Timer Set 2
Bridge timer mode. Same mode as Set 1
but with bridges. Suitable for LANs with moderate delays.
- TCP Timer Set 3
Router/X.25 timer mode. Same mode as Set 1
but with routers or X.25. Suitable for LANs with longer delays.
- TCP Timer Set 4
High data loss timer mode. Suitable for networks
with high data losses.
- TCP Timer Set 5
Heavy traffic timer mode. Suitable for extended
switching applications on local LAN or with bridges where there
is heavy traffic.
- Management Timer Set 1
Normal traffic mode. This is appropriate in a LAN
environment with normal traffic
- Management Timer Set 2
Busy LAN mode. This is appropriate in a LAN environment
with busy traffic.
