Solaris 10:
# dladm show-dev
nxge0 link: down speed: 0 Mbps duplex: unknown
nxge1 link: up speed: 1000 Mbps duplex: full
OpenSolaris / OpenIndiana / Solaris 11:
# dladm show-phys
LINK MEDIA STATE SPEED DUPLEX DEVICE
rtls0 Ethernet up 100 full rtls0
rtls1 Ethernet down 0 unknown rtls1