![[Contents]](FIGURE/CONTENT.GIF)
OpenTP1 Version 7 Description
![[Glossary]](FIGURE/GLOSS.GIF)
![[Index]](FIGURE/INDEX.GIF)
![[Back]](FIGURE/FRONT.GIF)
![[Next]](FIGURE/AFTER.GIF)
A host connecting two or more physical networks with the TCP/IP protocol is called a multi-homed host. To communicate with OpenTP1 that runs in such a host, use the IP address of a LAN connected to the host. For normal communication, users need not be aware of the IP address (host name) for that OpenTP1 instance.
If a multi-homed host runs two OpenTP1 instances and uses either of them with the System Switchover facility, a system switch may prevent communication with an OpenTP1 instance on the host. To avoid blocked communication with the OpenTP1 instances on the host, the correspondence between the IP addresses (host names) and OpenTP1 instances must be defined.
To use either of the OpenTP1 instances in a host with the System Switchover facility, specify the host name in the my_host operand in the system common definition and specify the following in the dcbindht definition command:
The following explains a configuration example that requires correspondence between OpenTP1 instances and IP addresses (host names). If one host uses the System Switchover facility in which two OpenTP1 instances run, the dcbindht definition command must always be specified.
The following figure shows an example of a one-to-one system switch configuration in which two OpenTP1 instances must be associated with a specific IP address (host name).
Figure 6-9 OpenTP1 instances and IP addresses (host names) in a one-to-one system switch
![[Figure]](FIGURE/ZU031008.GIF)
The following figure shows an example of a double-system switch configuration in which two OpenTP1 instances must be associated with a specific IP address (host name).
Figure 6-10 OpenTP1 instances and IP addresses (host names) for a double-system switch
![[Figure]](FIGURE/ZU060900.GIF)
All Rights Reserved. Copyright (C) 2006, 2010, Hitachi, Ltd.