NonStop NS1200 Planning Guide

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.
If a remote maintenance LAN connection is required, use the second network interface card
(NIC) in the NonStop system console to connect to the operations LAN, and access the other
devices in the maintenance LAN using Remote Desktop via the console.
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.
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 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.
Multiple System Consoles Managing One System
Two maintenance switches provide fault tolerance and extra ports for adding system consoles.
You must change the preconfigured IP addresses of the second and subsequent system consoles
before you can add them to the LAN.
Managing Multiple Nodes Using One or Two System Consoles
If you want to manage more than one node from a console (or from a fault-tolerant pair of
consoles), you can daisy chain the maintenance switches together. This configuration requires
an IP address scheme to support it. Contact your HP service provider to design this configuration.
Cascading Ethernet Switch or Hub Configuration
Additional Ethernet switches or hubs can be connected (cascaded) to the maintenance switches
already installed. Primary and backup system consoles and the server must be on the same
subnet.
You must change the preconfigured IP addresses of the second and subsequent system consoles
before you can add them to the LAN.
76 Maintenance and Support Connectivity