System Administration Guide: Basic Administration

Booting a SPARC Based System From the Network

You might need to boot a system from the network under the following conditions:

Two network configuration boot strategies are available:

ProcedureSPARC: How to Boot a System From the Network

Any system can boot from the network if a boot server is available. You might want to boot a stand-alone system from the network if the system cannot boot from the local disk. For information on changing or resetting the default boot device, see SPARC: How to Change the Default Boot Device by Using the Boot PROM.

Two network configuration boot strategies are available on sun–4u systems:

The default network boot strategy is set to RARP. You can use either protocol, depending on whether a RARP boot server or a DHCP boot server is available on your network.

Note –

Sun Ultra systems must have at least PROM version 3.25.nn to use the DHCP network boot strategy. For information on determining your PROM version, see SPARC: How to Find the PROM Revision Number for a System.

If both protocols are available, you can temporarily specify which protocol to use in the boot command. Or, you can save the network boot strategy across system reboots at the PROM level by setting up an NVRAM alias. The following example uses the nvalias command to set up a network device alias for booting DHCP by default on a Sun Ultra 10 system.

ok nvalias net	/pci@1f,4000/network@1,1:dhcp

As a result, when you type boot net, the system boots by using the DHCP network book strategy.

Note –

You should not use the nvalias command to modify the NVRAMRC file, unless you are very familiar with the syntax of this command and the nvunalias command. For information on using these commands, see the OpenBoot 3.x Command Reference Manual.

Before You Begin

You must have already set up a RARP or DHCP boot server in your network to use either protocol to boot successfully.

  1. If necessary, shut down the system.

  2. Determine the method for booting from the network, and select one of the following:

    1. Boot the system from the network by using the DHCP strategy.

      ok boot net[:dhcp]

      If you have changed the PROM setting to boot DHCP by default, as in the preceding nvalias example, you only have to specify boot net.

    2. Boot the system from the network by using the RARP strategy.

      ok boot net[:rarp]

      Because RARP is the default network boot strategy, you only have to specify boot net:rarp if you have changed the PROM value to boot DHCP.