M 4000 - problem with fibre port

 Hi
i have plumbed Firbre port and assigned but it is not coming up, can any one help me on this?

o/p :

root@ryolym4000b2 # dladm show-dev
bge0            link: up        speed: 1000  Mbps       duplex: full
bge1            link: unknown   speed: 0     Mbps       duplex: unknown
nxge0           link: down      speed: 0     Mbps       duplex: unknown
nxge1           link: unknown   speed: 0     Mbps       dup

root@ryolym4000b2 # ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 10.1.40.81 netmask ffffff00 broadcast 10.1.40.255
        ether 0:21:28:7e:38:bc
nxge0: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 3
        inet 10.1.40.82 netmask ffffff00 broadcast 10.1.40.255