How to check network card settings in Solaris 10?

In following example, this server has only one cable going to network with 1000Mbps.

# dladm show-dev
bge0            link: up        speed: 1000  Mbps       duplex: full
bge1            link: unknown   speed: 0     Mbps       duplex: unknown
bge2            link: unknown   speed: 0     Mbps       duplex: unknown
bge3            link: unknown   speed: 0     Mbps       duplex: unknown