trunk

Router>ena

Router#conf t

Router(config)#interface f0/0

Router(config-if)#no shutdown

Router(config)#interface f0/0.10

Router(config-subif)#encapsulation dot1Q 10

Router(config-subif)#ip address 192.168.10.1 255.255.255.0

Router(config-subif)#int f0/0.20

Router(config-subif)#encapsulation dot1Q 20

Router(config-subif)#ip address 192.168.20.1 255.255.255.0

Router(config-subif)#int f0/0.30

Router(config-subif)#encapsulation dot1Q 30

Router(config-subif)#ip address 192.168.30.1 255.255.255.0

Router(config-subif)#exit

Switch#vlan database

Switch(vlan)#vlan 10 name vlan10

Switch(vlan)#vlan 20 name vlan20

Switch(vlan)#vlan 30 name vlan30

Switch(vlan)#exit

Switch#conf t

Switch(config)#interface f0/2

Switch(config-if)#switchport mode access

Switch(config-if)#switchport access vlan 10

Switch(config-if)#int f0/3

Switch(config-if)#switchport mode access

Switch(config-if)#switchport access vlan 20

Switch(config-if)#int f0/4

Switch(config-if)#switchport mode access

Switch(config-if)#switchport access vlan 30

Switch(config-if)#exit

Switch#conf t

Switch(config)#interface f0/1

Switch(config-if)#switchport mode trunk

Switch(config-if)#^Z

Switch#

Switch#sh vla

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Fa0/1, Fa0/5, Fa0/6, Fa0/7

                                                Fa0/8, Fa0/9, Fa0/10, Fa0/11

                                                Fa0/12, Fa0/13, Fa0/14, Fa0/15

                                                Fa0/16, Fa0/17, Fa0/18, Fa0/19

                                                Fa0/20, Fa0/21, Fa0/22, Fa0/23

                                                Fa0/24, Gig1/1, Gig1/2

10   vlan10                           active    Fa0/2

20   vlan20                           active    Fa0/3

30   vlan30                           active    Fa0/4

1002 fddi-default                     act/unsup

1003 token-ring-default               act/unsup

1004 fddinet-default                  act/unsup

1005 trnet-default                    act/unsup

Switch#sh interfaces trunk

Switch#

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up

Switch#sh interfaces trunk

Port        Mode         Encapsulation  Status        Native vlan

Fa0/1       on           802.1q         trunking      1

Port        Vlans allowed on trunk

Fa0/1       1-1005

Port        Vlans allowed and active in management domain

Fa0/1       1,10,20,30

Port        Vlans in spanning tree forwarding state and not pruned

Fa0/1       none

Switch#