set the IPs and static route on ERX

show the config on certain interface
(config)# run show configuration interface gigabitEthernet X/X/X.YYY

set the ip address subnet on certain interface
(config)# interface gigabitEthernet X/X/X.YYY
(config)# ip address 1.1.1.1 255.255.255.0 secondary

set static route on router
(config)#ip route 1.1.1.1/24 2.2.2.2
or
(config)#ip route 1.1.1.1/24 gigabitEthernet X/X/X.YYY


setting targets:

o. let certain subnet can access to internet