assigning ip to second nic

Hi admins

i want to assign new ip adress to my aix 5.3 machine which is in LPAR

ent3 Available       Virtual I/O Ethernet Adapter (l-lan)
ent0 Available 05-08 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
ent1 Available 05-09 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
ent2 Available 07-08 10/100/1000 Base-TX PCI-X Adapter (14106902)
ent0 and ent3 Ip adresses already assigned.Now i want to assign new ip to either ent1 or ent3.

Already assigned ip is 10.62.0.21 (ent0) .
New ip will be 10.50.3.6 and gateway i believe 10.50.3.1.
i use smitty tcpip to assign ip and gateway.
Both the ips are on different subnets.should i add static route. Please suggest
below is my current route table.
Routing tables

Destination        Gateway           Flags   Refs     Use  If   Exp  Groups
Route Tree for Protocol Family 2 (Internet):
default            10.62.0.1         UG      414 1850385406 en0      -      -
10.50.0.5          10.62.0.1         UGH       4    921302 en0      -      -
10.62.0.0          10.62.0.21        UHSb      0         0 en0      -      -   =>
10.62/24           10.62.0.21        U         7 128537414 en0      -      -
10.62.0.21         127.0.0.1         UGHS    123 2004559079 lo0      -      -
10.62.0.255        10.62.0.21        UHSb      0        22 en0      -      -
127/8              127.0.0.1         U        14  26631541 lo0      -      -
192.168.2.0        192.168.2.21      UHSb      0         0 en3      -      -   =>
192.168.2/24       192.168.2.21      U         0 1063580224 en3      -      -
192.168.2.21       127.0.0.1         UGHS      1    373349 lo0      -      -
192.168.2.255      192.168.2.21      UHSb      0        22 en3      -      -

Regards
newaix