Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-58
Forwarding Expand-over-IP Packets to Other
Expand Line-Handler Processes
Forwarding Expand-over-IP Packets to Other Expand Line-
Handler Processes
Packets received by an Expand-over-IP line-handler process can be forwarded to
another type of Expand line-handler process, either on the same processor or on a
different processor. Packet forwarding is performed via the message system; this
allows servers without Expand-over-IP line-handler processes and pre-D40 systems to
access an IP network.
Figure 18-17 illustrates the flow of packets between two applications, one of which is
running an Expand-over-IP line-handler process and one of which is not. In the figure,
Expand-over-IP line-handler processes are running on nodes 1 and 2.
Figure 18-17. Expand-Over-IP Packet Forwarding
034CDT .CDD
IP
Network
Node 1
Application
Message System
Expand Line-
Handler Process
TCP/IP Process
Node 3
Application
Message System
Expand
Line-Handler
Process
Node 2
Message System
Expand
Line-Handler
Process
Expand
Line-Handler
Process
TCP/IP Process
Direct-
Connect
Connection