can we configure the ce0 and ce1 interface as ce4000 and ce5000 in solaris 9

I have a server configured similar way.. I need to setup another two server in such configuration find the sample output from working server.

Please help

root@judi:[15:26:19]:/dev# ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
ce4000: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2
        inet 172.20.49.144 netmask ffffff80 broadcast 172.20.49.255
        ether 0:3:ba:7a:e2:d0
ce5000: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 3
        inet 172.20.37.67 netmask ffffff00 broadcast 172.20.37.255
        ether 0:3:ba:7a:e2:d0
root@judi:[15:26:21]:/dev# grep -i net /etc/path_to_inst
"/pci@1f,0/network@a" 0 "ce"
"/pci@1f,0/network@b" 1 "ce"
root@judi:[15:26:43]:/dev# uname -a
SunOS judi 5.9 Generic_118558-02 sun4u sparc SUNW,Serverblade1
root@judi:[15:26:47]:/dev#

I think that is is a Vlan configuration over the normal ce interfaces,

please check

http://docs.oracle.com/cd/E19253-01/...eij/index.html

troy's unix space: VLAN Tagged Interfaces (Solaris)

Thanks for your reply, I tried plumb the interface as ce4000 and ce5000, also configured the IP's as of ce0and ce1, then unconfigured the ce0 and ce1.. how ever after doing this it stops communicating outside network.. even not reachable for gateway..
Now I reverted back to ce0 and ce1 with same ip configuration and it working fine..

any thoughts ..

VLAN tagged interfaces cannot communicate but with other interfaces configured in the same VLAN and this is by design.

You need to have at least your switch properly configured for this to work.