如圖，兩臺交換機為三層交換機，實現路由器能訪問所有pc，且所有pc能互訪。

1.     創建vlan，交換機上配置接口類型，access和trunk

Sw1：

vlan batch 10 20 30 40 50

#

interface GigabitEthernet0/0/1

port link-type access

port default vlan 10

#

interface GigabitEthernet0/0/2

port link-type access

port default vlan 10

#

interface GigabitEthernet0/0/3

port link-type trunk

port trunk allow-pass vlan 2 to 4094

#

interface GigabitEthernet0/0/4

port link-type access

port default vlan 50

sw2：

vlan batch 10 20 30 40 50

#

interface GigabitEthernet0/0/1

port link-type access

port default vlan 20

#

interface GigabitEthernet0/0/2

port link-type access

port default vlan 30

#

interface GigabitEthernet0/0/3

port link-type trunk

port trunk allow-pass vlan 2 to 4094

2.      Sw上配置vlanif地址，下發給相關接口

Sw1：

interface Vlanif10

ip address 10.1.1.254 255.255.255.0

#

interface Vlanif40

ip address 10.2.2.1 255.255.255.0

#

interface Vlanif50

ip address 10.2.3.1 255.255.255.0

sw2：

interface Vlanif20

ip address 10.1.2.254 255.255.255.0

#

interface Vlanif30

ip address 10.1.3.254 255.255.255.0

#

interface Vlanif40

ip address 10.2.2.2 255.255.255.0

3.     路由器上配置ip地址實現和sw1直連能通信

R1：

interface GigabitEthernet0/0/0

ip address 10.2.3.10 255.255.255.0

4.      在路由器和交換機上配置路由協議實現路由通信，這里采用ospf

R1：

ospf 1

area 0.0.0.0

network 10.2.3.0 0.0.0.255

sw1：

ospf 1

area 0.0.0.0

network 10.1.1.0 0.0.0.255

network 10.2.2.0 0.0.0.255

network 10.2.3.0 0.0.0.255

sw2:

ospf 1

area 0.0.0.0

network 10.2.2.0 0.0.0.255

network 10.1.2.0 0.0.0.255

network 10.1.3.0 0.0.0.255

5.    最終測試：

[r1]ping -c 1 10.1.1.1

 PING 10.1.1.1: 56  data bytes, press CTRL_C to break

   Reply from 10.1.1.1: bytes=56 Sequence=1 ttl=127 time=50 ms

 --- 10.1.1.1 ping statistics ---

   1 packet(s) transmitted

   1 packet(s) received

   0.00% packet loss

   round-trip min/avg/max = 50/50/50 ms

[r1]ping -c 1 10.1.2.3

 PING 10.1.2.3: 56  data bytes, press CTRL_C to break

   Reply from 10.1.2.3: bytes=56 Sequence=1 ttl=126 time=70 ms

 --- 10.1.2.3 ping statistics ---

   1 packet(s) transmitted

   1 packet(s) received

   0.00% packet loss

   round-trip min/avg/max = 70/70/70 ms

[r1]ping -c 1 10.1.3.4

 PING 10.1.3.4: 56  data bytes, press CTRL_C to break

   Reply from 10.1.3.4: bytes=56 Sequence=1 ttl=126 time=60 ms

 --- 10.1.3.4 ping statistics ---

   1 packet(s) transmitted

   1 packet(s) received

   0.00% packet loss

   round-trip min/avg/max = 60/60/60 ms