TCP/IP (Parallel Library) Configuration and Management Manual

Configuring Parallel Library TCP/IP for Complex and
Heavy-Use Environments
HP NonStop TCP/IP (Parallel Library) Configuration and Management Manual—522271-006
3-21
Configuration Example for the Hybrid Listening
Model
Configuration Example for the Hybrid Listening Model
This example demonstrates the hybrid listener model discussed above (see Hybrid
Listener Model on page 3-9) using iTP WebServer configured with round-robin filtering
enabled. This configuration has four processors each running their own distributors.
Each distributor listens for connections and hands over the connections to the web
servers that it controls. In this configuration, each distributor has servers only in its own
processor. All the connections share the same IP address on the same G4SA, which in
turn uses round-robin distribution for incoming connections to the different processors.
The startup files and subnet initiation files for establishing the Parallel Library TCP/IP
environment and subnets are the same as Configuration Example for the Standard
Listening Model.
Figure 3-8 shows the round-robin feature in this configuration. An iTP WebServer
process is configured in each processor, bound to the same port, and is round-robin
filtering enabled. (See Round-Robin Filtering on page 2-4.)
The first connection request establishes a connection to one of the Distrib processes.
The adapter then routes the next connection request to the next Distrib process in the
next processor, and so on.
Figure 3-10. Configuration Example for Hybrid Listening Model: iTP WebServer
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