Configuring Your System For Multiple Console Use - Sun Microsystems Netra CT 820 Administration Manual

You begin by logging in to the distributed management card through either the
serial port or the Ethernet port. Once a console session with a node board is
established, you can run Solaris system administration commands, such as passwd,
read status and error messages, or halt the board in that particular slot.
Configuring Your System for Multiple Console
Use
To enable your system to use multiple consoles, you set several variables, either at
the Solaris level or at the OpenBoot PROM level. Set these variables on each node
board to enable console use.
M To Configure Your System for Multiple Consoles
1. Log in as root to the node board, using the on-board console port ttya.
2. Enter either set of the following commands to enable multiple consoles:
From the Solaris level:
# eeprom "multiplexer-output-devices=ttya ssp-serial"
# eeprom "multiplexer-input-devices=ttya ssp-serial"
# eeprom input-device=input-mux
# eeprom output-device=output-mux
# reboot
or
From the OpenBoot PROM level:
ok setenv multiplexer-output-devices ttya ssp-serial
ok setenv multiplexer-input-devices ttya ssp-serial
ok setenv input-device input-mux
ok setenv output-device output-mux
ok reset-all
Chapter 3 Administering Your System 55