Cisco实战:配置三层交换的综合案例

网络基本情况

网络拓扑结构为:中心交换机采用 Catalyst 4006-S3，

Supervisor Engine III G引擎位于第1插槽，用于实现三层交换;1块24口

1000Base-T模块位于第2插槽，用于连接网络服务器;1块6端口1000Base-X模块位

于第3插槽，用于连接6台骨干交换机。一台交换机采用Cisco Catalyst 3550-

24-EMI，并安装1块1000Base-X GBIC千兆模块。一台交换机采用Cisco

Catalyst 3550-24-SMI，也安装1块1000Base-X GBIC千兆模块。另外四台交换机

采用Cisco Catalyst 2950G-24-SMI，安装1块1000Base-T GBIC千兆模块。

所有服务器划分为一个，即VLAN 50。四台Catalyst 2950G-24-SMI交换机也只划分为一个VLAN，分别为VLAN 60、VLAN 70、VLAN 80和VLAN 90。

Catalyst 3550-24-EMI划分为4个VLAN，分别为VLAN 10、VLAN 20、VLAN 30和

VLAN 40。Catalyst 3550-24-SMI划分2个VLAN，分别为VLAN 60和VLAN 80，与另

外两台Catalyst 2950G-24-SMI交换机分别位于同一VLAN。

实例分析

由于所有Catalyst 2950G交换机都是一个独立的VLAN，因此，必须先在

这些交换机上创建VLAN(VLAN 60~VLAN 90)，并将所有端口都指定至该VLAN。然

后，再在Catalyst 4006交换机相应端口上分别创建VLAN。Catalyst 4006的

1000Base-X端口分别与各Catalyst 2950G的1000Base-X端口连接。其中，

GigabitEthernet3/2端口连接至1号Catalyst 2950交换机(VLAN 60)，GigabitEthernet3/3端口连接至2号Catalyst 2950交换机(VLAN 70)，GigabitEthernet3/4端口连接至3号Catalyst 2950交换机(VLAN 80)，GigabitEthernet3/5端口连接至4号Catalyst 2950交换机(VLAN 90)，GigabitEthernet3/6端口连接至6号楼交换机(VLAN 80)。
由于在Catalyst 3550-24-EMI上划分有4个VLAN(VLAN 10～VLAN 40)，而4个VLAN都需借助于一条1000Base-X链路实现与Catalyst 4006的GigabitEthernet3/1端口连接，因此，必须在Catalyst 4006与Catalyst 3550-24- EMI之间创建一个Trunk。

同样，在Catalyst 3550-24-SMI上划分有2个VLAN(VLAN 60和VLAN 80)，而4个VLAN都需借助于一条1000Base-X链路实现与Catalyst 4006的GigabitEthernet3/6端口连接，因此，必须在Catalyst 4006与Catalyst 3550-24- EMI之间创建一个Trunk。

另外，所有服务器均连接至Catalyst 4006的1000Base-T模块，并单独成为一个VLAN(VLAN 90)，因此，也必须为这些交换机创建一个VLAN，并将所有端口指定至该VLAN。需要注意的是，考虑到的需要，也可以剩余几个RJ-45端口(如21至24端口)不指定至任何VLAN，从而便于连接网络管理设备。默认状态下，所有端口都属于VLAN1，而且也只有在VLAN1中才能实现对网络中所有设备的管理。
配置清单

Cisco Catalyst 4006交换机配置清单

Current configuration : 5594 bytes

!

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

service compress-config

!

hostname hsnc

!

boot system bootflash:cat4000-is-mz.121-8a.EW1.bin

no logging console

enable secret level 1 5 $1$rkQW$1HKyKdN5f.Ri5zxeoF8Yv/

!

ip subnet-zero

!

!

!

interface GigabitEthernet1/1

no snmp trap link-status

!--不为Supervisor Engine III G引擎中的1000Base-X插槽指定VLAN

interface GigabitEthernet1/2

no snmp trap link-status

!

!

interface GigabitEthernet2/1

switchport vlan 50

no snmp trap link-status

!--将端口GigabitEthernet2/1指定至VLAN 50

!

interface GigabitEthernet2/2

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/3

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/4

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/5

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/6

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/7

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/8

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/9

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/10

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/11

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/12

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/13

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/14

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/15

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/16

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/17

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/18

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/19

switchport access vlan 50

no snmp trap link-status

!

interface GigabitEthernet2/20

switchport access vlan 50

no snmp trap link-status

!--不将GigabitEthernet2/20～24指定至任何VLAN

!
interface GigabitEthernet3/1

switchport trunk encapsulation dot1q

！--启用802.1Q Trunk封装，即在该端口创建Trunk

switchport trunk allowed vlan 1-80

！--允许vlan 1-90在该中继线通讯

！--可以拒绝或允许某个VLAN访问该Trunk

！--确保未被授权的VLAN通过该Trunk，实现VLAN的访问安全

switchport mode trunk

！--将该端口设置为Trunk

description netcenter

no snmp trap link-status

!

interface GigabitEthernet3/2

switchport access vlan 60

no snmp trap link-status

!--将端口GigabitEthernet3/2指定至VLAN 60

!

interface GigabitEthernet3/3

switchport access vlan 70

no snmp trap link-status

!--将端口GigabitEthernet3/3指定至VLAN 70

!

interface GigabitEthernet3/4

switchport access vlan 80

no snmp trap link-status

!--将端口GigabitEthernet3/4指定至VLAN 80

!

interface GigabitEthernet3/5

switchport access vlan 90

no snmp trap link-status

!--将端口GigabitEthernet3/5指定至VLAN 90

!

interface GigabitEthernet3/6

switchport trunk encapsulation dot1q

！--启用802.1Q Trunk封装协议，即在该端口创建Trunk

switchport trunk allowed vlan 1-80

！--允许vlan 1-90在该中继线通讯

！--可以拒绝或允许某个VLAN访问该Trunk

！--从而确保未被授权的VLAN通过该Trunk，实现VLAN访问安全

switchport mode trunk

！--将该端口设置为Trunk

description netcenter

no snmp trap link-status

!

interface Vlan1

description netmanger

no ip address

!

!--对VLAN1进行描述

interface Vlan10

description network center

no ip address

!--对VLAN2进行描述

!

interface Vlan20

description computer center

no ip address

!

interface Vlan30

description network lab

no ip address

!

interface Vlan40

description huaxuelou

no ip address

!

interface Vlan50

description wulilou

no ip address

!

interface Vlan60

description shengwulou

no ip address

!
interface Vlan70

description zhongwenxi

no ip address

!

interface Vlan80

description tushuguan

no ip address

!

!

line con 0

stopbits 1

line vty 0 4

password aaa

login

!

end

Cisco Catalyst 3550-EMI配置清单

Building configuration...

Current configuration : 4055 bytes

!

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname office

!

enable secret 5 $1$p0fU$JeyPOM0RuL.Fqfe71efHF1

!

ip subnet-zero

!

!

spanning-tree extend system-id

!

!

!

interface FastEthernet0/1

switchport access vlan 10

!--将端口FastEthernet0/1指定至VLAN 10

no ip address

!

interface FastEthernet0/2

switchport access vlan 10

no ip address

!

interface FastEthernet0/3

switchport access vlan 10

no ip address

!

interface FastEthernet0/4

switchport access vlan 10

no ip address

!

interface FastEthernet0/5

switchport access vlan 10

no ip address

!

interface FastEthernet0/6

switchport access vlan 20

no ip address

!--将端口FastEthernet0/6指定至VLAN 20

!
interface FastEthernet0/7

switchport access vlan 20

no ip address

!

interface FastEthernet0/8

switchport access vlan 20

no ip address

!

interface FastEthernet0/9

switchport access vlan 20

no ip address

!

interface FastEthernet0/10

switchport access vlan 20

no ip address

!

interface FastEthernet0/11

switchport access vlan 30

no ip address

!--将端口FastEthernet0/6指定至VLAN 30

!

interface FastEthernet0/12

switchport access vlan 30

no ip address

!

interface FastEthernet0/13

switchport access vlan 30

no ip address

!

interface FastEthernet0/14

switchport access vlan 30

no ip address

!

interface FastEthernet0/15

switchport access vlan 30

no ip address

!

interface FastEthernet0/16

switchport access vlan 30

no ip address

!

interface FastEthernet0/17

switchport access vlan 30

no ip address

!

interface FastEthernet0/18

switchport access vlan 30

no ip address

!

interface FastEthernet0/19

switchport access vlan 40

no ip address

!--将端口FastEthernet0/6指定至VLAN 40

!
interface FastEthernet0/20

switchport access vlan 40

no ip address

!

interface FastEthernet0/21

switchport access vlan 40

no ip address

!

interface FastEthernet0/22

switchport access vlan 30

no ip address

!

interface FastEthernet0/23

switchport access vlan 40

no ip address

!

interface FastEthernet0/24

switchport access vlan 40

no ip address

!

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

！--启用802.1Q Trunk封装协议，即在该端口创建Trunk

switchport trunk allowed vlan 1-80

！--允许vlan 1-80在该中继线通讯

switchport mode trunk

！--将该端口设置为Trunk

no ip address

!

interface GigabitEthernet0/2

no ip address

!

interface Vlan1

ip address 172.16.100.12 255.255.255.0

!--LAN1指定IP地址

no ip route-cache

no ip mroute-cache

!

ip classless

ip http server

!

!

!

!

line con 0

line vty 0 4

password aaa

login

line vty 5 15

login

!

end
Cisco Catalyst 3550-SMI配置清单

Building configuration...

Current configuration : 4055 bytes

!

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname office

!

enable secret 5 $1$p0fU$JeyPOM0RuL.Fqfe71efHF1

!

ip subnet-zero

!

!

spanning-tree extend system-id

!

!

!

interface FastEthernet0/1

switchport access vlan 60

!--将端口FastEthernet0/1指定至VLAN 60

no ip address

!

interface FastEthernet0/2

switchport access vlan 60

no ip address

!

interface FastEthernet0/3

switchport access vlan 60

no ip address

!

interface FastEthernet0/4

switchport access vlan 60

no ip address

!

interface FastEthernet0/5

switchport access vlan 60

no ip address

!

interface FastEthernet0/6

switchport access vlan 20

no ip address

!--将端口FastEthernet0/6指定至VLAN 20

!
interface FastEthernet0/7

switchport access vlan 20

no ip address

!

interface FastEthernet0/8

switchport access vlan 20

no ip address

!

interface FastEthernet0/9

switchport access vlan 20

no ip address

!

interface FastEthernet0/10

switchport access vlan 20

no ip address

!

interface FastEthernet0/11

switchport access vlan 80

no ip address

!--将端口FastEthernet0/6指定至VLAN 80

!

interface FastEthernet0/12

switchport access vlan 80

no ip address

!

interface FastEthernet0/13

switchport access vlan 80

no ip address

!

interface FastEthernet0/14

switchport access vlan 80

no ip address

!

interface FastEthernet0/15

switchport access vlan 80

no ip address

!

interface FastEthernet0/16

switchport access vlan 80

no ip address

!

interface FastEthernet0/17

switchport access vlan 80

no ip address

!

interface FastEthernet0/18

switchport access vlan 80

no ip address

!

interface FastEthernet0/19

switchport access vlan 80

no ip address

!--将端口FastEthernet0/6指定至VLAN 80

!
interface FastEthernet0/20

switchport access vlan 80

no ip address

!

interface FastEthernet0/21

switchport access vlan 80

no ip address

!

interface FastEthernet0/22

switchport access vlan 80

no ip address

!

interface FastEthernet0/23

switchport access vlan 80

no ip address

!

interface FastEthernet0/24

switchport access vlan 80

no ip address

!

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

！--启用802.1Q Trunk封装协议，即在该端口创建Trunk

switchport trunk allowed vlan 1-80

！--允许vlan 1-80在该中继线通讯

switchport mode trunk

！--从将该端口设置为Trunk

no ip address

!

interface GigabitEthernet0/2

no ip address

!

interface Vlan1

ip address 172.16.100.13 255.255.255.0

!--为LAN1指定IP地址

no ip route-cache

no ip mroute-cache

!

ip classless

ip http server

!

!

!

!

line con 0

line vty 0 4

password aaa

login

line vty 5 15

login

!

end

Cisco Catalyst 2950G配置清单

四台Cisco Catalyst 2950G的配置基本相同，下面仅列出VLAN 60的配置情况。

Building configuration...

Current configuration : 2143 bytes

!

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname msl

!

enable password aaa

!

ip subnet-zero

!

!

spanning-tree extend system-id

!

!

interface FastEthernet0/1

switchport access vlan 60

no ip address

!

interface FastEthernet0/2

switchport access vlan 60

no ip address

!

interface FastEthernet0/3

switchport access vlan 60

no ip address

!

interface FastEthernet0/4

switchport access vlan 60

no ip address

!

interface FastEthernet0/5

switchport access vlan 60

no ip address

!

interface FastEthernet0/6

switchport access vlan 60

no ip address

!

interface FastEthernet0/7

switchport access vlan 60

no ip address

!

interface FastEthernet0/8

switchport access vlan 60

no ip address

!

interface FastEthernet0/9

switchport access vlan 60

no ip address

!

interface FastEthernet0/10

switchport access vlan 60

no ip address

!

interface FastEthernet0/11

switchport access vlan 60

no ip address

!
interface FastEthernet0/12

switchport access vlan 60

no ip address

!

interface FastEthernet0/13

switchport access vlan 60

no ip address

!

interface FastEthernet0/14

switchport access vlan 60

no ip address

!

interface FastEthernet0/15

switchport access vlan 60

no ip address

!

interface FastEthernet0/16

switchport access vlan 60

no ip address

!

interface FastEthernet0/17

switchport access vlan 60

no ip address

!

interface FastEthernet0/18

switchport access vlan 60

no ip address

!

interface FastEthernet0/19

switchport access vlan 60

no ip address

!

interface FastEthernet0/20

switchport access vlan 60

no ip address

!

interface FastEthernet0/21

switchport access vlan 60

no ip address

!

interface FastEthernet0/22

switchport access vlan 60

no ip address

!

interface FastEthernet0/23

switchport access vlan 60

no ip address

!

interface FastEthernet0/24

switchport access vlan 60

no ip address

!

interface GigabitEthernet0/1

no ip address

!

interface GigabitEthernet0/2

no ip address

!

interface Vlan1

ip address 172.16.100.10 255.255.255.0

!

ip classless

ip http server

!

!

!

!

line con 0

line vty 0 4

password aaa

login

line vty 5 15

login

!

end

以下内容 ancy 由撰写

经典的三层网络案例分析。改进中。。。新加很多先进技术噢！新增的配置。

经典的三层网络案例分析。

目的：让不同的vlan 之间可以互相通讯。

IP规划

vlna ID ip网段 vlan网关

vlan 1 172.16.1.0/24 172.16.1.7-9

vlan 2 172.16.2.0/24 172.16.2.252-254

vlan 3 172.16.3.0/24 172.16.3.252-254

vlan 4 172.16.4.0/24 172.16.4.252-254

vlan 5 172.16.5.0/24 172.16.5.252-254

vlan 6 172.16.6.0/24 172.16.6.252-254

vlan 7 172.16.7.0/24 172.16.7.252-254

vlan 8 172.16.8.0/24 172.16.8.252-254

vlan 9 172.16.9.0/24 172.16.9.252-254

路由器配置



一、cisco路由器配置：

Enable

Configure terminal

Service password-encryption

Hostname cisco1721

Enable secret 654321

Enable password 123456

ip subnet-zero

ip name-server 202.96.134.133 202.96.172.218

interface fastethernet 0

ip address 61.142.221.5 255.255.255.240

speed auto

no shutdown

interface serial 0

ip unnumbered fastethernet 0

encapsulation ppp

no fair-queue

bandwidth 2048

no shutdown

exit

ip classless

ip route 0.0.0.0 0.0.0.0 serial 0

no ip http server

line con 0

line aux 0

line vty 0 4

password 12345678

login

no scheduler allocate

end

copy running-config startup-config

reload

请注意NAT等是在防火墙设置的．

交换机配置

一、Catalyst 4006-s3交换机配置：

Enable

Configure terminal

service pad

service password-encryption

hostname c4006-s3

enable password 123456.

Enable secret 654321

Ip subnet-zero

Ip name-server 172.16.8.1 172.16.8.2

ip routing

Exit

Vlan database

Vtp mode server

Vtp domain centervtp

Vlan 2 name vlan2

Vlan 3 name vlan3

Vlan 4 name vlan4

Vlan 5 name vlan5

Vlan 6 name vlan6

Vlan 7 name vlan7

Vlan 8 name vlan8

Vlan 9 name vlan9

Exit

Configure terminal

Interface port-channel 1

Interface gigabitethernet 2/1

channel-group 1

Interface gigabitethernet 2/2

channel-group 1

Interface gigabitethernet 2/1

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigabitethernet 2/3

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigabitethernet 2/4

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigbitethernet 2/5

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigbitethernet 2/6

switchport mode trunk

switchport trunk encapsulation dotlq

switchprot trunk allowed vlan all

interface gigbitethernet 2/7

switchport access vlan 9

no shutdown

interface range gigabitethernet 2/8 – 20

switchport mode access

switchport access vlan 8

no shutdown

spanning-tree portfast

interface gigabitethernet 3/1

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigabitethernet 3/2

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

spanning-tree vlan 1-9 root primary

spanning-tree backbonefast

interface vlan 1

ip address 172.16.1.7 255.255.255.0

no shutdown

standby 1 ip 172.16.1.9

standby 1 priority 110 preempt

interface vlan 2

ip address 172.16.2.252 255.255.255.0

no shutdown

standby 2 ip 172.16.2.254

standby 2 priority 110 preempt

interface vlan 3

ip address 172.16.3.252 255.255.255.0

no shutdown

standby 3 ip 172.16.3.254

standby 3 priority 110 preempt

interface vlan 4

ip address 172.16.4.252 255.255.255.0

no shutdown

standby 4 ip 172.16.4.254

standby 4 priority 110 preempt

interface vlan 5

ip address 172.16.5.252 255.255.255.0

no shutdown

standby 5 ip 172.16.5.254

standby 5 priority 110 preempt

interface vlan 6

ip address 172.16.6.252 255.255.255.0

no shutdown

standby 6 ip 172.16.6.254

standby 6 priority 110 preempt

interface vlan 7

ip address 172.16.7.252 255.255.255.0

no shutdown

standby 7 ip 172.16.7.254

standby 7 priority 110 preempt

interface vlan 8

ip address 172.16.8.252 255.255.255.0

no shutdown

standby 8 ip 172.16.8.254

standby 8 priority 110 preempt

interface vlan 9

ip address 172.16.9.252 255.255.255.0

no shutdown

standby 9 ip 172.16.9.254

standby 9 priority 110 preempt

exit

ip classless

ip route 0.0.0.0 0.0.0.0 172.16.9.250

line con 0

line aux 0

line vty 0 15

password 12345678

login

end

copy running-config startup-config

reload

二、Catalyst 3550-12T交换机配置：

Enable

Configure terminal

service pad

service password-encryption

hostname c3550-12t

enable password 123456

enable secret 654321

ip subnet-zero

ip name-server 172.16.8.1. 172.16.8.2

ip routing

exit

vlan database

vtp mode server

vtp domain centervtp

vlan 2 name vlan2

vlan 3 name vlan3

vlan 4 name vlan4

vlan 5 name vlan5

vlan 6 name vlan6

vlan 7 name vlan7

vlan 8 name vlan8

vlan 9 name vlan9

exit

configure terminal

interface port-channel 1

interface gigabitethernet 0/1

channel-group 1

interface gigabitethernet 0/2

channel-group 1

exit

interface gigabitethernet 0/1

switchport mode trunk

switchport encapsulation dotlq

swithchport trunk allowed vlan all

interface gigabitethernet 0/3

switchport mode trunk

switchport trunk encapsulation dotlq

swithcport trunk allowed vlan all

interface gigabitethernet 0/4

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigabitethernet 0/5

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigabitethernet 0/6

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

interface gigabitethernet 0/7

switchport access vlan 9

no shutdown

interface range gigabitethernet 0/8 – 10

switchport mode access

switchport access vlan 8

no shutdown

spanning-tree portfast

interface gigabitethernet 0/11

switchport mode trunk

switchport trunk encapsulation dotlq

swithcprot trunk allowed vlan all

interface gigabitethernet 0/12

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

spanning-tree vlan 1-9 root secondary

spanning-tree backbonefast

interface vlan 1

ip address 172.16.1.8 255.255.255.0

no shutdown

standby 1 ip 172.16.1.9

standby 1 priority 100 preempt

interface vlan 2

ip address 172.16.2.253 255.255.255.0

no shutdown

standby 2 ip 172.16.2.254

standby 2 priority 100 preempt

interface vlan 3

ip address 172.16.3.253 255.255.255.0

not shutdown

standby 3 ip 172.16.3.254

standby 3 priority 100 preempt

interface vlan 4

ip address 172.16.4.253 255.255.255.0

no shutdown

standby 4 ip 172.16.4.254

standby 4 priority 100 preempt

interface vlan 5

ip addess 172.16.5.253 255.255.255.0

no shutdown

standby 5 ip 172.16.5.253

standby 5 priority 100 preempt
interface vlan 6

ip address 172.16.6.253 255.255.255.0

no shutdown

standby 6 ip 172.16.6.254

standby 6 priority 100 preempt

interface vlan 7

ip address 172.16.7.253 255.255.255.0

no shutdown

standby 7 ip 172.16.7.254

standby 7 priority 100 preempt

interface vlan 8

ip address 172.16.8.253 255.255.255.0

no shutdown

standby 8 ip 172.16.8.254

standby 8 priority 100 preempt

interface vlan 9

ip address 172.16.9.253 255.255.255.0

no shutdown

standby 9 ip 172.16.9.254

standby 9 priority 100 preempt

exit

ip classless

ip route 0.0.0.0 0.0.0.0 172.16.9.250

ip http server

line con 0

line aux 0

line vty 0 15

password 12345678

login

end

copy running-config statup-config

reload

三、Catalyst 2950-24 vlan2 交换机配置：

Enable

Configure terminal

Service pad

Service password-encryption

Hostname c2950-241

Enable password 123456

Enable secret 654321

Ip subnet-zero

Interface vlan 1

Ip address 172.16.1.1 255.255.255.0

management

No shutdown

Ip default-gateway 172.16.1.9

Ip name-server 172.16.8.1 172.16.8.2

exit

Vlan database

Vtp mode client

Vtp domain centervtp

Exit

Configure terminal

Interface range fastethernet 0/1 – 20

Switchport mode access

Switchport accesss vlan 2

No shutdown

Spanning-tree portfast

Spanning-tree uplinkfast

Spanning-tree backbonefast

Interface gigabitethernet 0/1

Switchport mode trunk

Switchport trunk encapculation dotlq

Switchport trunk allowed vlan all

Spanning-tree cost 10

Interface gigabitethernet 0/2

Switchport mode trunk

Switchport trunk encapculation dotlq

Switchport trunk allowed vlan all

Spanning-tree cost 20

Exit

Line con0

Line aux 0

Line vty 0 15

Password 12345678

Login

End

Copy running-config statup-config

Reload

四、catalyst 2950-24 vlan 3 交换机配置：

enable

configure terminal

service pad

service password-encryption

hostname c2950-242

enable password 123456

enable secret 654321

ip subnet-zero

interface vlan 1

ip address 172.16.1.2 255.255.255.0

management

no shutdown

ip default-gateway 172.16.1.9

ip name-server 172.16.8.1 172.16.8.2

exit

vlan database

vtp domain centervtp

vtp mode client

exit

configure terminal

interface range fastethernet 0/1 – 20

switchport mode access

switchport access vlan 3

no shutdown

spanning-tree portfast

spanning-tree uplinefast

spanning-tree backbonefast

interface gigabitethernet 0/1

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

spanning-tree cost 10

interface gigabitethernet 0/2

switchport mode trunk

switchport trunk encapsulation dotlq

switchport trunk allowed vlan all

spanning-tree cost 20

exit

line con 0

line aux 0

line vty 0 15

password 12345678

login

end

copy running-config startup-config

reload