NonStop Networking Overview

In a NonStop system environment, those n hosts can be consolidated onto a single system and
have access to a shared database on that same system.
Returning to the Nonstop TCP/IPv6 and CIP subsystems' architectural features of allowing multiple
server processes to bind to a shared port and IP address, the web server process in can run 16
copies of itself and access a shared database while presenting a single image to the network.
NOTE: NonStop TCP/IPv6 had a limitation of one listening process per processor per port. CIP
does not have this limitation. There can be many listening processes per processor per port.
Figure 7 shows round-robin filtering on a single IP address. Incoming connection requests are
distributed among 16 instances of the server process in 16 different processors.
Figure 7 Round-Robin Filtering in the NonStop TCP/IPv6 and CIP Environments
Scaling Your Application on the NonStop System
Several listener models are discussed in the TCP/IPv6 Configuration and Management Manual,
each with unique configuration requirements depending on how that particular listener model
works. CIP also supports the listening models and scaling techniques described in the TCP/IPv6
Configuration and Management Manual. By configuring your NonStop TCP/IPv6 or CIP subsystem
to use round-robin filtering, you can cause incoming connection requests to be distributed among
different application instances running in different processors.
NOTE: To enable NonStop TCP/IPv6 and CIP round-robin filtering only for certain applications,
you can limit the ports upon which round-robin filtering is enabled by adding a DEFINE. See the
TCP/IPv6 Configuration and Management Manual or the Cluster I/O Protocols (CIP) Configuration
and Management Manual for an explanation of this DEFINE.
Round-robin filtering configuration for an application requires that you configure the NonStop
TCP/IPv6 or CIP environment with round-robin filtering and that you define the transport-service
providers (TCP6SAM or CIPSAM processes) in the same TACL session in which you define the filter
key.
You configure NonStop TCP/IPv6 or CIP with round-robin filtering enabled in the Guardian
environment and the OSS environment inherits the DEFINE that establishes the environment.
18 Networking on Integrity NonStop Systems