Because the 3C589 card is not supported during Solaris installation, you must update network configuration files before one can be used as a network interface.
Create a /etc/hostname.pcelx# file (where # is a socket number) to specify the host name to be associated with this interface.
Add an IP address for the new host name to the file /etc/inet/hosts.
Ensure that the associated network is listed in /etc/inet/netmasks.
Ensure that the Name Service Switch /etc/nsswitch.conf configuration file includes the network and local services you need.
Reboot the system.
This process is described in System Administration Guide, Volume 3.