Introduction to Networking for NonStop NS-Series Servers (H06.03+, J06.03+)
Networking on Integrity NonStop Servers
Introduction to Networking for HP Integrity NonStop NS-Series Servers—529874-003
1-12
Integrity NonStop Server Networking Compared to
Other Platforms
Ethernet Failover: Fault-Tolerant Connectivity
NonStop TCP/IPv6 provides failover at the adapter level by using a feature called
Ethernet failover. Ethernet failover allows a second Ethernet interface to take over
connections from another interface if the other interface fails.
Unlike other failover implementations, NonStop TCP/IPv6 Ethernet failover does not
require one of the interfaces to act as a “hot standby” in anticipation of a failure. Both
interfaces are active and allow inbound and outbound network traffic to be distributed
between them. Hence, in addition to having fault-tolerance at the interface level by
using Ethernet failover, you also gain scalability when all your interfaces are
performing correctly.
For more information about Ethernet failover, see the TCP/IPv6 Configuration and
Management Manual.
Logical Network Partitioning (LNP)
In the NonStop TCP/IPv6 environment, all applications have access to all interfaces (IP
addresses) unless you configure logical-network partitioning (LNP).
One of the most important differences between conventional TCP/IP and NonStop
TCP/IPv6 is that NonStop TCP/IPv6 has one manager process ($ZZTCP) and all
interfaces are associated with that single process. This difference influences how you
configure the subsystem. In conventional TCP/IP, you can have multiple TCP/IP
processes, each having one or more interfaces uniquely associated with them, as
shown in Figure 1-5.
In NonStop TCP/IPv6, if you do not configure the environment to use logical-network
partitioning, applications using NonStop TCP/IPv6 do not know which interface they
Figure 1-5. Conventional TCP/IP: Data From the Interface is Restricted to
Applications Using the Associated Process
VST127.vsd
Application 2
Application 1
1.2.3.4
1.2.3.5
1.2.3.6
TCP/IP
Process 1
1.2.3.7
1.2.3.8
1.2.3.9
LAN Adapter
TCP/IP
Process 2
LAN Adapter