enable
config t

int range gig0/0-1
no shutdown

interface GigabitEthernet0/0
no shutdown
do wr

interface GigabitEthernet0/0
ip address 192.168.1.1 255.255.255.128
interface GigabitEthernet0/1
ip address 192.168.1.129 255.255.255.128

do sh start

DHCP:
interface GigabitEthernet0/0
ip dhcp pool switchone
default-router 192.169.1.1
dns-server 192.168.1.100
network 192.168.1.0 255.255.255.0
exit