要求：
某企业，专线接入，有华为路由器一台，三层交换机一台，二层交换机若干；
1、要求划几个VLAN，为不同部门。
2、所有主机能够通过路由器上网。
设计思路：
1、路由器配置比较简单，主要做NAT转换和ACL控制哪些主机能上外网；
2、三层交换机，划分VLAN，实现内部VLAN间路由，可直接接终端或二层交换机
3、二层交换相接终端。。
设计时，关于防病毒ACL列表、VLAN间互联隔离技术等问题此处未讨论。感兴趣的朋友，我们可以另起篇章进行讨论。
本设计以华为产品为例，思科产品配置原理相同，只是命令行不同而已。欢迎有志之士把它翻译成思科的配置。
基实也可以不要三层交换机，直接在路由器上做单臂也可以。。只是不适合复杂的网络和发展。。配置：
一、路由器配置
version 5.20, Release 1205P02, Basic
#
给路由器命名
sysname HUAWE-ROUTE
#
domain default enable system
#
vlan 1
#
radius scheme system
server-type extended
primary authentication 127.0.0.1 1645
primary accounting 127.0.0.1 1646
user-name-format without-domain
#
domain system
access-limit disable
state active
idle-cut disable
self-service-url disable
#
定义ACL列表，允许所有IP访问外网，这里你可以指定允许某些或禁止某些主机上网。acl number 2000
rule 0 permit
#
interface Aux0
async mode flow
link-protocol ppp
#
接专线的接口，配置运营商分配的IP
interface Ethernet0/0
nat outbound 2000
duplex full
speed 100
ip address 218.22.3.126 255.255.255.252
#
接局域网三层交换机的地址
interface Ethernet0/1
DESC TO—SWitch
duplex full
speed 100
ip address 192.168.8.1 255.255.255.252
#
interface NULL0
#
至公网默认路由
ip route-static 0.0.0.0 0.0.0.0 218.22.3.125
至三层交换机回程路由
ip route-static 192.168.0.0 255.255.0.0 192.168.8.2
#
user-interface con 0
user-interface aux 0
未设置TELNET登陆密码，这样外网的人登陆不了，当然你也登陆不了。哈安全吧。（如果想TELNET，需要设置密码和ACL禁止外网的人登陆）
user-interface vty 0 4
#
Return
二、三层交换配置
#
给交换机命名
sysname hwswich
#
设备SUPER密码
super password level 3 cipher ;1>$VGEA)N2C+1!! #
radius scheme system
server-type huawei
primary authentication 127.0.0.1 1645
primary accounting 127.0.0.1 1646
user-name-format without-domain
domain system
radius-scheme system
access-limit disable
state active
vlan-assignment-mode integer
idle-cut disable
self-service-url disable
messenger time disable
domain default enable system
#
local-server nas-ip 127.0.0.1 key huawei
建立业务VLAN及与路由器互联口VLAN
vlan 5
desc to-router
#
vlan 10
desc bumen1
#
vlan 20
desc bumen2
#
分别给SVI接口设计IP地址，即所属VLAN PC终端的网关#
interface Vlan-interface 5
DESC to-router
ip address 192.168.8.2 255.255.255.252
interface Vlan-interface 10
ip address 192.168.1.1 255.255.255.0
#
interface Vlan-interface 20
ip address 192.168.2.1 255.255.255.0 #
与二层交换机互联接口
interface Ethernet0/1
duplex full
speed 100
port link-type trunk
port trunk permit vlan 10 20
#
接普通终端的接口
interface Ethernet0/2
port access vlan 10
#
interface Ethernet0/3
port access vlan 20
#
interface Ethernet0/4
shutdown
#
interface Ethernet0/5
#
interface Ethernet0/6 shutdown
#
interface Ethernet0/7 shutdown
#
interface Ethernet0/8 shutdown
#
interface Ethernet0/9 shutdown
#
interface Ethernet0/10 shutdown
#
interface Ethernet0/11 shutdown
#
interface Ethernet0/12 shutdown
#
interface Ethernet0/13
shutdown
#
interface Ethernet0/14 shutdown
#
interface Ethernet0/15 shutdown
#
interface Ethernet0/16 shutdown
#
interface Ethernet0/17 shutdown
#
interface Ethernet0/18 shutdown
#
interface Ethernet0/19 shutdown
#
interface Ethernet0/20 shutdown
#
interface Ethernet0/21
shutdown
#
interface Ethernet0/22
shutdown
#
interface Ethernet0/23
shutdown
#
与路由器互联接口
interface Ethernet0/24
desc to-router
duplex full
speed 100
port access vlan 5
#
SNMP网关配置，可以不要
snmp-agent
snmp-agent local-engineid 800007DB000FE23F864D6877
snmp-agent community read public
snmp-agent sys-info contact HuaWei_Hotline 4008302118or8008302118
snmp-agent sys-info location BeiJing China
snmp-agent sys-info version all
#
设置默认路由
ip route-static 0.0.0.0 0.0.0.0 192.168.8.1
user-interface aux 0
设置TELNET登陆密码
user-interface vty 0 4
authentication-mode password
set authentication password cipher CZP'5O+PV9=FQ!! #
return
三、二层交换机配置
#
sysname L1-1
#
#
radius scheme system
server-type huawei
primary authentication 127.0.0.1 1645
primary accounting 127.0.0.1 1646
user-name-format without-domain
domain system
radius-scheme system
access-limit disable
state active
idle-cut disable
self-service-url disable
messenger time disable
domain default enable system
#
local-server nas-ip 127.0.0.1 key huawei
#
interface Aux0/0
#
vlan 1
#
vlan 10
#
vlan 20
#
#
interface Ethernet0/1 port access vlan 10
#
interface Ethernet0/2 port access vlan 10
#
interface Ethernet0/3 port access vlan 10
#
interface Ethernet0/4 port access vlan 10
#
interface Ethernet0/5 port access vlan 10
#
interface Ethernet0/6 port access vlan 10
#
interface Ethernet0/7 port access vlan 10
#
interface Ethernet0/8
port access vlan 10
#
interface Ethernet0/9 port access vlan 10
#
interface Ethernet0/10 port access vlan 10
#
interface Ethernet0/11 port access vlan 10
#
interface Ethernet0/12 port access vlan 20
#
interface Ethernet0/13 port access vlan 20
#
interface Ethernet0/14 port access vlan 20
#
interface Ethernet0/15 port access vlan 20
#
interface Ethernet0/16 port access vlan 20
#
interface Ethernet0/17 port access vlan 20
#
interface Ethernet0/18 port access vlan 20
#
interface Ethernet0/19 port access vlan 20
#
interface Ethernet0/20 port access vlan 20
#
interface Ethernet0/21 port access vlan 20
#
interface Ethernet0/22 port access vlan 20
#
interface Ethernet0/23
port access vlan 20
#
interface Ethernet0/24
duplex full
speed 100
port link-type trunk
port trunk permit vlan 10 20 #
user-interface aux 0
user-interface vty 0 4
#
return