HP 3000 Manuals HP 3000 Manuals
Performing a Network Switchover
When a network switchover from the home to the alternate system occurs,
the effects of the network switchover on the alternate system are as
follows:
* For LAN and X.25:
* All network services (NS) users lose their connections
because the transport and services have been restarted.
* The alternate system loses its network identity, and no
connections are possible to this system from remote nodes
unless they use the home system's name and IP address.
* For Terminal I/O and PAD:
* All DTC and PAD connections are lost because resetting the
DTCs clears the connections on the DTC side.
* The alternate system continues to be known to the DTCs as
the alternate system for TIO and PAD connections.
The following steps are required to perform a network switchover:
1. From the alternate system, enter the following commands:
: NSCONTROL ABORT Return
: NETCONTROL STOP Return
This is required to stop the LAN and X.25.
2. From the OpenView DTC Manager workstation, perform the following:
a. Stop the OpenView DTC Manager.
b. Close all windows.
c. Exit windows.
3. From the DOS command on the OpenView DTC Manager workstation,
change to the directory where the OpenView DTC Manager is
installed. For example:
C: > CD DTCMGR Return
The DTC files that reside in this directory must contain the
working configuration file (the file that will be downloaded to
the DTC), the backup configuration file, and the main
configuration file. For example:
DTC01.DTC the working configuration file
DTC01.BAC the backup configuration file
DTC01.MAI the main configuration file
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NOTE Changes made to the main configuration file must be
maintained in the backup configuration file.
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4. Copy the backup configuration file over the working configuration
file, for example:
C:/DTCMGR > XCOPY DTC01.BAC DTC01.DTC/S Return
5. From the OpenView DTC Manager workstation, restart the OpenView
DTC Manger and perform the following:
a. Select DTC.
b. Log on.
c. Reset the DTC CPU.
d. Start X.25.
6. From the alternate system, enter the following commands to restart
all network connections in switchover mode:
: COPY NMCONMN.PUB.SYS,NMCONFIG.PUB.SYS Return
: NETCONTROL START;NET=lan1 Return
: NETCONTROL START;NET=X25net Return
: NSCONTROL START Return
While in switchover mode, the alternate system is known by one nodename
to the transport (the home system name) and by another nodename (the
alternate system name) to the TIO subsystem. If the alternate system is
rebooted while the switchover configuration file (NMCONFIG.PUB.SYS) is
active, the alternate system will also be known as the home system's name
to the TIO subsystem. This requires the use of the main DTC
configuration file.