网络拓扑图
ROS的配置
第一步：定义Ros的WAN口及LAN口
将ether1定义为WAN口，连接光猫
ether2定义为LAN口，连接三层交换机
第二步 ：在Ros上添加PPPOE Client，
在Interface接口视图下，选择" + " 添加一个PPPOE Client
在General窗口，修改name及Interface两项 name ：PPPOE的名称（可自定义） Interface ：选择WAN口（WAN口）
在Dial Out窗口下，输入user 及 password User：PPPOE账号 Password：PPPOE密码 默认勾选User peer DNS（DNS服务器） 及 Add Default Route（默认路由）），勾选后，无需手动添加DNS及静态路由，即可访问Internet。
在IP视图的Addresses窗口，单击 " + " 添加 ether2-LAN的接口地址：192.168.10.1/24
第三步： 伪装（NAT）
在IP接口视图下，打开Firewall窗口的NAT，选择” + “ 添加 分别需要为每个网段都设置一条NAT
为192.168.200.0/24网段添加一条伪装
masquerade 伪装
第四步 ： 添加回程路由
在IP-Routes视图下， DST address(目标网段)：192.168.100.0/24 Gatway（LAN口及LAN口IP），相当于下一跳地址。：LAN 需要分别为每个网段添加回程路由（否则流量无法到达该VLAN，会导致出去的包回不来哦）
H3C三层交换机配置
交换机配置如下：
#
version 5.20, Release 2222P10
#
sysname H3C
#
irf mac-address persistent timer
irf auto-update enable
undo irf link-delay
#
domain default enable system
#
web idle-timeout 30
#
password-recovery enable
#
vlan 1
#
vlan 10
#
vlan 100
#
vlan 200
#
domain system
access-limit disable
state active
idle-cut disable
self-service-url disable
#
dhcp server ip-pool 10
network 192.168.10.0 mask 255.255.255.0
gateway-list 192.168.10.1
#
user-group system
group-attribute allow-guest
#
local-user abc
password cipher $c$3$3O3TRePwLP0yAqW37DGX1h4rfkdIGQ==
authorization-attribute level 3
service-type ftp
local-user admin
password cipher $c$3$Zn/sUTHSf0+ria4SnwGKiPjLfdwXUt7C
authorization-attribute level 3
service-type web
local-user root
password cipher $c$3$4eOQFNifn3uQrpYkYQovG6LThLqFT2Rcc0VD
service-type telnet
service-type web
#
vlan-group n1
#
interface NULL0
#
interface Vlan-interface1
ip address 172.16.1.1 255.255.255.0
undo dhcp select server global-pool
#
interface Vlan-interface10
ip address 192.168.10.2 255.255.255.0
#
interface Vlan-interface100
ip address 192.168.100.1 255.255.255.0
#
interface Vlan-interface200
ip address 192.168.200.1 255.255.255.0
#
interface GigabitEthernet1/0/1
#
interface GigabitEthernet1/0/2
#
interface GigabitEthernet1/0/3
#
interface GigabitEthernet1/0/4
#
interface GigabitEthernet1/0/5
#
interface GigabitEthernet1/0/6
#
interface GigabitEthernet1/0/7
#
interface GigabitEthernet1/0/8
#
interface GigabitEthernet1/0/9
#
interface GigabitEthernet1/0/10
#
interface GigabitEthernet1/0/11
port access vlan 200
#
interface GigabitEthernet1/0/12
port access vlan 100
#
interface GigabitEthernet1/0/13
#
interface GigabitEthernet1/0/14
#
interface GigabitEthernet1/0/15
#
interface GigabitEthernet1/0/16
#
interface GigabitEthernet1/0/17
#
interface GigabitEthernet1/0/18
#
interface GigabitEthernet1/0/19
#
interface GigabitEthernet1/0/20
port access vlan 10
#
interface GigabitEthernet1/0/21
#
interface GigabitEthernet1/0/22
#
interface GigabitEthernet1/0/23
#
interface GigabitEthernet1/0/24
port link-type trunk
port trunk permit vlan all
#
interface GigabitEthernet1/0/25
shutdown
#
interface GigabitEthernet1/0/26
shutdown
#
interface GigabitEthernet1/0/27
shutdown
#
interface GigabitEthernet1/0/28
shutdown
#
rip 1
network 192.168.101.0
network 192.168.102.0
network 192.168.103.0
network 10.0.0.0
#
ip route-static 0.0.0.0 0.0.0.0 10.0.8.1
ip route-static 0.0.0.0 0.0.0.0 192.168.10.1
#
dhcp enable
#
ftp server enable
#
load xml-configuration
#
user-interface aux 0
authentication-mode password
set authentication password cipher $c$3$KcMReVoIeZfuRWS6GZQmpte0jZycfXExsQ==
user-interface vty 0 15
#
return
最终，测试每个网段互通的问题，全部互通
