需要注意的是 R3的主接口配置双工， 子接口配置封装模式同时指明vlan id，
SW1的接口上，上先配速度，再配双工，与R1R2access，与R3trunk（封装802.1q），
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#no ip do lo
Router(config)#line con 0
Router(config-line)#logg syn
Router(config-line)#no exec-t
Router(config-line)#exit
Router(config)#host R1
R1(config)#no ip routing
R1(config)#ip defaul
R1(config)#ip default-ga
R1(config)#ip default-gateway
<cr>
R1(config)#ip default-gateway
R1(config)#int e0/0
R1(config-if)#ip ad
R1(config-if)#no shu
R1(config-if)#
*Mar 1 00:09:09.171: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
*Mar 1 00:09:10.171: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to up
R1(config-if)#duple
R1(config-if)#duplex ?
full Force full duplex operation
half Force half-duplex operation
R1(config-if)#duplex full
R3(config)#int e0/0
R3(config-if)#duplex fu
R3(config-if)#duplex full 主接口下
R3(config-if)#exit
R3(config)#int e0/0.1
R3(config-subif)#ip add
% Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,
or ISL vLAN.
R3(config-subif)#encap
R3(config-subif)#encapsulation dot1q
% Incomplete command.
R3(config-subif)#enca
R3(config-subif)#encapsulation ?
dot1Q IEEE 802.1Q Virtual LAN
R3(config-subif)#encapsulation dot1q ?
<1-4095> IEEE 802.1Q VLAN ID required, range 1 - 0xFFF.
R3(config-subif)#encapsulation dot1q 13 ? 必须有vlan id 13
native Make this as native vlan
<cr>
R3(config-subif)#encapsulation dot1q 13
R3(config-subif)#ip add
R3(config)#int e 0/0
R3(config-if)#no shu 不要忘记总接口下的no shu
sw(config)#host SW1
SW1(config)#no ip routing
SW1(config)#end
SW1#vlan database
SW1(vlan)#vlan 13 name vlan13
VLAN 13 added:
Name: vlan13
SW1(vlan)#vlan 23 name vlan23
VLAN 23 added:
Name: vlan23
SW1(vlan)#int f0/1
^
% Invalid input detected at '^' marker.
SW1(vlan)#exit
APPLY completed.
Exiting....
SW1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW1(config)#int f0/1
SW1(config-if)#switchport mode access
SW1(config-if)#switchport access vlan 13
SW1(config-if)#speed 10
SW1(config-if)#duplex full
SW1(config-if)#int f0/2
SW1(config-if)#sw
SW1(config-if)#switchport mode acc
SW1(config-if)#switchport mode access
SW1(config-if)#sw
SW1(config-if)#switchport acc vlan 23
SW1(config-if)#dup
SW1(config-if)#duplex full
SW1(config-if)#duplex full
Duplex will not be set until speed is set to non-auto value 必须先配速度
SW1(config-if)#speed 10
SW1(config-if)#duplex full
开始配与R3的trunk
SW1(config-if)#speed 10
SW1(config-if)#duplex full
SW1(config-if)#
*Mar 1 00:31:04.507: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to up
SW1(config-if)#swi
SW1(config-if)#switchport mode
SW1(config-if)#switchport mode trun
SW1(config-if)#switchport mode trunk
SW1(config-if)#switchport trunk encapsulation dot1q 两条命令
SW1(config-if)#
R1#ping
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to
!!!!!
R3#show ip r
*Mar 1 00:36:52.379: %SYS-5-CONFIG_I: Configured from console by console
R3#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
C
C
