CCNP知识：三层交换在vlan间路由

r4和r5模拟pc机，r3为三层交换机，r1为路由器。
r4:
no ip routing
in e0/1
ip add 192.168.2.2 255.255.255.0
duplx full
no sh
ip default-gateway 192.168.2.1
r5:
no ip routing
in e0/1
ip add 192.168.3.2 255.255.255.0
duplx full
no sh
ip default-gateway 192.168.3.1
r3:
vlan database
vlan 3
vlan 2
exit
ip routing
in f0/1
switchport mode acc
switchport acc vlan 2
in f0/2
switchport mode acc
switchport acc vlan 3
in vlan 2
ip add 192.168.2.1 255.255.255.0
no sh
in vlan 3
ip add 192.168.3.1 255.255.255.0
no sh
in f0/3
no switchport  这条命令将端口作为三层端口使用，二层端口是不能够配ip地址的。
ip add 192.168.1.1 255.255.255.0
no sh
ip route 0.0.0.0 0.0.0.0 192.168.1.2
r1:
in e0/1
ip add 192.168.1.2 255.255.255.0
no sh
ip nat inside
in e0/2
ip add 118.122.119.1 255.255.255.0
no sh
ip nat outside
access-list 1 permit 192.168.2.0 0.0.0.255
access-list 2 permit 192.168.3.0 0.0.0.255
ip nat inside source list 1 inter e0/2 overload
ip route 0.0.0.0 0.0.0.0 118.122.119.2
r2:
in e0/1
ip add 118.122.119.2 255.255.255.0
no sh
in loop 1
ip add 2.2.2.2 255.0.0.0
no sh