NonStop NS14000 Planning Guide (H06.10+)

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.
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 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.
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.
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.
Multiple System Consoles Managing Multiple Systems
The servers must have fault-tolerant dedicated service LAN connections to the Ethernet switches
or hubs. In addition, the system consoles and the servers must be on the same subnet. If a server
is configured to receive dial-ins, the server must occupy the same subnet as the system console
receiving the dial-ins.
For best OSM performance, no more than 10 servers should be included within one subnet.
Because all servers are shipped with the same preconfigured IP addresses for MSP0, MSP1,
$ZTCP0, and $ZTCP1, you must change these IP addresses for the second and subsequent servers
before you can add them to the LAN.
You must change the preconfigured IP addresses of the second and subsequent system consoles
before you can add them to the LAN.
Maintenance Architecture
This simplified illustration shows the two elements of the maintenance architecture plus the
OSM maintenance console applications:
Maintenance Architecture 113