TCP/IPv6 Configuration and Management Manual (G06.29+, H06.03+, J06.03+)

Example Illustrations and Adding Features to the

Basic Configuration

HP NonStop TCP/IPv6 Configuration and Management Manual—524523-012

5-8

Plan Complex WAN Environments

NonStop TCP/IPv6 provides improved scalability for the SWAN subsystem. In

conventional TCP/IP, traffic for a given path had to go through the processor which

contained the conventional TCP/IP process; however, with NonStop TCP/IPv6, you can

configure the WAN subsystem so that not only the workload of a WAN I/O process but

also the workload of TCP/IP done on its behalf is spread across all the processors in

which you have configured the WAN I/O processes.

In conventional TCP/IP, a one-to-one correspondence existed between the TCP/IP

process and a SLSA LIF/PIF. Traffic destined for that TCP/IP process would all flow

through a single processor (potentially creating congestion). In NonStop TCP/IPv6, a

one-to-any correspondence exists between the TCP/IP stack and all the LIFs/PIFs. So

now you can place your WAN I/O processes in any processor and you can associate

them with any LIFs/PIFs. Traffic now goes directly to the processors in which the WAN

I/O processes have been configured, eliminating the interprocessor hop formerly

required to get to the TCP/IP process servicing the LIF/PIF.

In addition to increased scalability, NonStop TCP/IPv6 also offers Ethernet Failover,

NonStop Operations. This provides another layer of fault-tolerance at the Ethernet

adapter level, from which the SWAN subsystem and its client-I/O processes can

benefit.