1.1 introduced the principle of

We all know that between vlan can not communicate with each other, we can come through the router so that two different communication between the vlan, called single route, if the switch is a three-tier can also be used to achieve the three-tier exchange, the following We are talking about single route.

1.2  equipments
      one router(R1) ,one switch(S1), two PCs(PC1,PC2)
1.2, preparation

PC1 :===============================

int f0 / 0

duplex full

speed 100

ip add 10.1.1.2 255.255.255.0

no sh

exit

ip route 0.0.0.0 0.0.0.0 10.1.1.1

Note: because the router is used to simulate the PC to be set up so the default address of the router R1 refers to the sub-interface address (to the back of preparation) to)

PC2 :==================================

int f0 / 0

duplex full

speed 100

ip add 10.2.2.2 255.255.255.0

no sh

exit

ip route 0.0.0.0 0.0.0.0 10.1.1.2

 

Sw1: exchange on the preparation ===================================

vlan datebase

vlan 10 / / create vlan 10

vlan 20 / / create vlan 20

int f0 / 1 / / will be f0 / 1 on the port in vlan 10

duplex full

speed 100

switchport mode access

switchport access vlan 10

no sh

int f0 / 2 / / will be f0 / 2 port on the Sino-vlan 20

duplex full

speed 100

switchport mode access

switchport access vlan 20

no sh

int f0 / 5 / / router and connect the port, so as trunk link.

shutdown

duplex full

speed 100

switchport mode trunk

switchport trunk encap dot1q

no sh

R1 :===================================

int f0 / 0

no sh

int f0/0.1

encap dot1q 10 / / 10 is for vlan 10

ip add 10.1.1.1 255.255.255.0

no sh

int f0/0.2

encap dot1q 20 / / of which 20 are for vlan 20

ip add 10.2.2.1 255.255.255.0

no sh

exit

ip route 10.1.1.0 255.255.255.0 f0/0.1 / / set up static routing

ip route 10.2.2.0 255.255.255.0 f0/0.2

 

1.3, verify

We PC1 to ping PC2, if successfully pass that test. Then we switch on the f0 / 5 shutdown is not coming to see the barrier. .