CISCO 4908G配置：
sh run
Building configuration...
Current configuration:
!
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
no service passWord-encryption
!
hostname Router
!
enable password cisco 进去特权模式的密码
!
username cisco password 0 cisco 远程telnet治理登陆的用户名和密码
ip subnet-zero
bridge irb 桥接路由
!
!
!
interface Port-channel1 建立一个快速通道
no ip address
no ip directed-broadcast
hold-queue 300 in
!
interface Port-channel1.1 设置快速通道的vlan1接口，子端口1
encapsulation dot1Q 1 native 封装802.1q协议，设置为vlan 1
no ip redirects
no ip directed-broadcast
bridge-group 1 桥接本交换机所有的vlan 1
!
interface Port-channel1.2 设置快速通道vlan 2接口，子端口2
encapsulation dot1Q 2 封装802.1q协议，设置为vlan 2
no ip redirects
no ip directed-broadcast
bridge-group 2 桥接本交换机的 vlan 2
!
interface Port-channel1.3
encapsulation dot1Q 3
no ip redirects
no ip directed-broadcast
bridge-group 3
!
interface Port-channel1.4
encapsulation dot1Q 4
no ip redirects
no ip directed-broadcast
bridge-group 4
!
interface Port-channel1.5
encapsulation dot1Q 5
no ip redirects
no ip directed-broadcast
bridge-group 5
!
interface Port-channel1.6
encapsulation dot1Q 6
no ip redirects
no ip directed-broadcast
bridge-group 6
!
interface Port-channel1.10
encapsulation dot1Q 10
no ip redirects
no ip directed-broadcast
bridge-group 10
!
interface GigabitEthernet1
no ip address
no ip directed-broadcast
!
interface GigabitEthernet1.1 设置第一个千兆口的第一个子端口
encapsulation dot1Q 1 native 使第一个子端口划分为vlan 1中
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet1.2 设置第一个千兆口的第二个子端口
encapsulation dot1Q 2 把第二个子端口划分为 vlan 2中(注：第2个子端口必须划分到vlan 2,不能划分到其他vlan否则，就无效)
no ip redirects
no ip directed-broadcast
bridge-group 2
!
interface GigabitEthernet1.3
encapsulation dot1Q 3
no ip redirects
no ip directed-broadcast
bridge-group 3
!
interface GigabitEthernet1.4
encapsulation dot1Q 4
no ip redirects
no ip directed-broadcast
bridge-group 4
!
interface GigabitEthernet1.5
encapsulation dot1Q 5
no ip redirects
no ip directed-broadcast
bridge-group 5
!
interface GigabitEthernet1.6
encapsulation dot1Q 6
no ip redirects
no ip directed-broadcast
bridge-group 6
!
interface GigabitEthernet1.10
encapsulation dot1Q 10
no ip redirects
no ip directed-broadcast
bridge-group 10
!
interface GigabitEthernet2
no ip address
no ip directed-broadcast
!
interface GigabitEthernet2.1
encapsulation dot1Q 1 native
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet2.2
encapsulation dot1Q 2
no ip redirects
no ip directed-broadcast
bridge-group 2
!
interface GigabitEthernet2.3
encapsulation dot1Q 3
no ip redirects
no ip directed-broadcast
bridge-group 3
!
interface GigabitEthernet2.4
encapsulation dot1Q 4
no ip redirects
no ip directed-broadcast
bridge-group 4
!
interface GigabitEthernet2.5
encapsulation dot1Q 5
no ip redirects
no ip directed-broadcast
bridge-group 5
!
interface GigabitEthernet2.6
encapsulation dot1Q 6
no ip redirects
no ip directed-broadcast
bridge-group 6
!
interface GigabitEthernet2.10
encapsulation dot1Q 10
no ip redirects
no ip directed-broadcast
bridge-group 10
!
interface GigabitEthernet3
no ip address
no ip directed-broadcast
!
interface GigabitEthernet3.1
encapsulation dot1Q 1 native
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet3.2
encapsulation dot1Q 2
no ip redirects
no ip directed-broadcast
bridge-group 2
!
interface GigabitEthernet3.3
encapsulation dot1Q 3
no ip redirects
no ip directed-broadcast
bridge-group 3
!
interface GigabitEthernet3.4
encapsulation dot1Q 4
no ip redirects
no ip directed-broadcast
bridge-group 4
!
interface GigabitEthernet3.5
encapsulation dot1Q 5
no ip redirects
no ip directed-broadcast
bridge-group 5
!
interface GigabitEthernet3.6
encapsulation dot1Q 6
no ip redirects
no ip directed-broadcast
bridge-group 6
!
interface GigabitEthernet3.10
encapsulation dot1Q 10
no ip redirects
no ip directed-broadcast
bridge-group 10
!
interface GigabitEthernet4
no ip address
no ip directed-broadcast
!
interface GigabitEthernet4.1
encapsulation dot1Q 1 native
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet4.2
encapsulation dot1Q 2
no ip redirects
no ip directed-broadcast
bridge-group 2
!
interface GigabitEthernet4.3
encapsulation dot1Q 3
no ip redirects
no ip directed-broadcast
bridge-group 3
!
interface GigabitEthernet4.4
encapsulation dot1Q 4
no ip redirects
no ip directed-broadcast
bridge-group 4
!
interface GigabitEthernet4.5
encapsulation dot1Q 5
no ip redirects
no ip directed-broadcast
bridge-group 5
!
interface GigabitEthernet4.6
encapsulation dot1Q 6
no ip redirects
no ip directed-broadcast
bridge-group 6
!
interface GigabitEthernet4.10
encapsulation dot1Q 10
no ip redirects
no ip directed-broadcast
bridge-group 10
!
interface GigabitEthernet5
no ip address
no ip directed-broadcast
!
interface GigabitEthernet5.1
encapsulation dot1Q 1 native
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet5.2
encapsulation dot1Q 2
no ip redirects
no ip directed-broadcast
bridge-group 2
!
interface GigabitEthernet5.3
encapsulation dot1Q 3
no ip redirects
no ip directed-broadcast
bridge-group 3
!
interface GigabitEthernet5.4
encapsulation dot1Q 4
no ip redirects
no ip directed-broadcast
bridge-group 4
!
interface GigabitEthernet5.5
encapsulation dot1Q 5
no ip redirects
no ip directed-broadcast
bridge-group 5
!
interface GigabitEthernet5.6
encapsulation dot1Q 6
no ip redirects
no ip directed-broadcast
bridge-group 6
!
interface GigabitEthernet5.10
encapsulation dot1Q 10
no ip redirects
no ip directed-broadcast
bridge-group 10
!
interface GigabitEthernet6
no ip address
no ip directed-broadcast
channel-group 1
!
interface GigabitEthernet7
no ip address
no ip directed-broadcast
channel-group 1
!
interface GigabitEthernet8
no ip address
no ip directed-broadcast
!
interface GigabitEthernet8.1
encapsulation dot1Q 1 native
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface GigabitEthernet8.2
encapsulation dot1Q 2
no ip redirects
no ip directed-broadcast
bridge-group 2
!
interface GigabitEthernet8.3
encapsulation dot1Q 3
no ip redirects
no ip directed-broadcast
bridge-group 3
!
interface GigabitEthernet8.4
encapsulation dot1Q 4
no ip redirects
no ip directed-broadcast
bridge-group 4
!
interface GigabitEthernet8.5
encapsulation dot1Q 5
no ip redirects
no ip directed-broadcast
bridge-group 5
!
interface GigabitEthernet8.6
encapsulation dot1Q 6
no ip redirects
no ip directed-broadcast
bridge-group 6
!
interface GigabitEthernet8.10
encapsulation dot1Q 10
no ip redirects
no ip directed-broadcast
bridge-group 10
!
interface BVI10 （远程治理登陆ip地址）
ip address 192.168.1.251 255.255.255.0
no ip directed-broadcast
!
ip classless
!
bridge 1 protocol ieee 配置桥接协议
bridge 2 protocol ieee
bridge 3 protocol ieee
bridge 4 protocol ieee
bridge 5 protocol ieee
bridge 6 protocol ieee
bridge 10 protocol ieee
bridge 10 route ip
!
line con 0
transport input none
line aux 0
line vty 0 4
password cisco
login local
!
end
假如，6509上面增加新的vlan 比如：增加 vlan 20,则在4908g上需要增加的配置的命令是
在每个千兆口上和快速通道口上划分一个新的子端口，
interface GigabitEthernet1.20
encapsulation dot1Q 20
bridge-group 20
每个端口都参照这样配置。
在router（config）#状态下，加入以下命令：
bridge 20 protocol ieee
按照这种方式就可以增加vlan
cisco 4908g-L3 三层交换机，每个端口均支持三层交换！ 第三层交换12 Mpps为布线室和数据中心提供高性能、中等密度的、10/100/1000M以太网模块交换平台。