This section describes configuring PMDF-XGS. There are three major parts to configure: (1) configuring each SNADS node to know about the PMDF-XGS transport bridge as another SNADS node, (2) configuring PMDF-XGS on the transport bridge, (3) configuring PMDF-XGS on the PMDF system.
Each SNADS node must be configured to believe that the PMDF-XGS transport bridge is another SNADS node and that the actual PMDF system is a SNADS node reachable through the PMDF-XGS transport bridge. And each SNADS node must be configured to be able to route distributions to the PMDF-XGS transport bridge, either directly or indirectly. Section 42.6.1 describes the configuration process on a DISOSS node, and Section 42.6.2 describes the configuration process on an AS/400 node. Note that once the PMDF-XGS transport bridge and the PMDF system are addressable from SNADS, then any host or mail system reachable by PMDF may be addressed from SNADS via aliased or embedded addressing; however, it is usually preferable to add additional routing information while configuring the SNADS nodes to allow direct addressing from SNADS of other commonly addressed hosts or mail systems. The PMDF-XGS transport bridge looks to other SNADS nodes just like an AS/400 running OV/400. Other systems reachable through PMDF appear to the SNADS nodes as remote AS/400 systems.
The PMDF-XGS transport bridge must be configured with a SNADS link to the SNADS world and a TCP/IP to the PMDF system. Section 42.6.3 describes this procedure.
And PMDF-XGS must be configured on the PMDF system. Section 42.6.4 describes this procedure.
Note that the subsections below focus on the case of using one snads_local channel to connect PMDF and the SNADS world. In this case, all SNADS distributions, i.e., all messages addressed to any SNADS recipient, will be sent from the PMDF system through the PMDF-XGS transport bridge to a single SNADS node, the default SNADS node associated with the channel, and that SNADS node will then have responsibility to route the distributions on to other SNADS nodes. Similarly, each message addressed to PMDF from the SNADS world will be routed within the SNADS world to the SNADS node which can pass the message through the PMDF-XGS transport bridge to the PMDF system. For example, in Figure 42-1 , all SNADS nodes route their mail to the SMTP network through the node APPLE. However, it is also possible to use multiple SNADS channels connecting, through the PMDF-XGS transport bridge, directly to different SNADS nodes, which may be a more efficient setup for certain SNADS network topologies; see Section 42.8 for details.