MLS-多層交換
＜VLAN間路由＞
VLAN之間在二層是分隔開的，如果要實現VLAN之間的通訊，必須要藉助到三層路由功能。
·支援VLAN間路由的裝置：
1.任意的3層交換機
2.支援以太口起子介面的路由器（2600以上）
＜單臂路由（Router on a Stick）＞
通過使用路由器完成VLAN之間的路由，路由器上要起子介面，並且要和交換機之間形成trunk。
例如: R
(f1/0)
|
|
(f1/5)
SW
(f1/6)(f1/7)
/
/
(f1/0) (f1/0)
PC1 PC2
R的配置:
R#sh run
Building configuration...
interface FastEthernet1/0
no ip address
duplex auto
speed auto
!
interface FastEthernet1/0.1
encapsulation dot1Q 10
ip address 172.16.1.1 255.255.255.0
!
interface FastEthernet1/0.2
encapsulation dot1Q 20
ip address 172.16.2.1 255.255.255.0
SW的配置:
SW#sh run int f1/5
Building configuration...
Current configuration : 71 bytes
!
interface FastEthernet1/5
switchport mode
trunk
no ip address
end
SW#sh run int f1/6
Building configuration...
Current configuration : 75 bytes
!
interface FastEthernet1/6
switchport access vlan
10
no ip address
end
SW#sh run int f1/7
Building configuration...
Current configuration : 75 bytes
!
interface FastEthernet1/7
switchport access vlan
20
no ip address
end
SW#sh vlan bri
VLAN
Name
Status
Ports
---- -------------------------------- ---------
-------------------------------
1
default
active Fa1/0,
Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/8, Fa1/9, Fa1/10
Fa1/11, Fa1/12, Fa1/13, Fa1/14
Fa1/15
10
VLAN0010
active
Fa1/6
20
VLAN0020