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NonStop NS1000 Planning Guide (H06.05+)

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Control, Configuration, and Maintenance Tools
HP Integrity NonStop NS1000 Planning Guide—542527-004
B-4
System Console Configurations
add a backup system console and additional system consoles.
When you use this configuration, you do not need to change the preconfigured IP
addresses.
Primary and Backup System Consoles Managing One
System
This configuration is recommended. It is similar to the setup configuration, but for
fault-tolerant redundancy, it includes a second maintenance switch, backup system
console, and modem. The maintenance switches provide a dedicated LAN in which all
nodes use the same subnet.
The dedicated service LAN is normally connected to the operations LAN using a single
connection. If both sides of the dedicated service LAN connect directly to the
operations LAN, you must:
•
Enable Spanning Tree Protocol (STP) in switches or routers that are part of the
operations LAN.
•
Change the preconfigured IP address of the backup system console before you
add it to the LAN
Note. Because the system console and maintenance switch are single points of failure that
could disrupt access to OSM, this configuration is not recommended for operations that require
high availability or fault tolerance.
Note. A subnet is a network division within the TCP/IP model. Within a given network, each
subnet is treated as a separate network. Outside that network, the subnets appear as part of a
single network. The terms subnet and subnetwork are used interchangeably.
Caution. Networks with more than one path between any two nodes can cause loops that
result in message duplication and broadcast storms that can bring down the network. If a
second connection is used, refer to the documentation for the ProCurve 2524 maintenance
switch and enable STP in the maintenance switches. STP ensures only one active path at any
given moment between two nodes on the network. In networks with two or more physical paths
between two nodes, STP ensures only one active path between them and blocks all other
redundant paths.