上一篇实现了使用Trunk做跨交换机VLAN通信，这一篇就试试使用三层交换实现不同网段，不同VLAN间的通信。
实验拓扑
在一台三层交换机下面连接一台二层交换机，再在二层交换机下面连接两台VPC，地址规划如下：
| 名称 | 接口 | VLAN | 地址 |
|---|---|---|---|
| PC1 | SW1-f1/1 | vlan 10 | 192.168.10.10/24 |
| PC2 | SW1-f1/2 | vlan 20 | 192.168.20.10/24 |
| 名称 | 接口 | 地址 |
|---|---|---|
| SW2 | vlan 10 | 192.168.10.1/24 |
| SW2 | vlan 20 | 192.168.20.1/24 |
配置方法
SW2(config)#int vlan 10
SW2(config-if)#ip address 192.168.10.1 255.255.255.0
SW2(config-if)#no shutdown配置过程
SW1
SW1关闭路由功能
SW1#conf t
SW1(config)#no ip routingSW1创建VLAN 10和VLAN 20，并添加接口。
SW1(config)#vlan 10,20
SW1(config-vlan)#ex
SW1(config)#int f1/1
SW1(config-if)#sw m a
SW1(config-if)#sw a v 10
SW1(config-if)#int f1/2
SW1(config-if)#sw m a
SW1(config-if)#sw a v 20
SW1(config-if)#ex
SW1(config)#do show vlan-sw b
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa1/0, Fa1/3, Fa1/4, Fa1/5
Fa1/6, Fa1/7, Fa1/8, Fa1/9
Fa1/10, Fa1/11, Fa1/12, Fa1/13
Fa1/14, Fa1/15
10 VLAN0010 active Fa1/1
20 VLAN0020 active Fa1/2
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsupSW1配置Trunk
SW1(config)#int f1/0
SW1(config-if)#sw m t
SW1(config-if)#sw t e dSW2
SW2创建VLAN 10和VLAN 20，并配置Trunk
SW2#conf t
SW2(config)#vlan 10,20
SW2(config-vlan)#ex
SW2(config)#int f1/0
SW2(config-if)#sw m t
SW2(config-if)#sw t e d
SW2(config-if)#ex- 虚接口配置
ip地址，并查看
SW2(config)#int vlan 10
SW2(config-if)#ip address 192.168.10.1 255.255.255.0
SW2(config-if)#no shutdown
SW2(config-if)#int vlan 20
SW2(config-if)#ip add 192.168.20.1 255.255.255.0
SW2(config-if)#no sh
SW2(config-if)#do show ip int b
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset administratively down down
FastEthernet0/1 unassigned YES unset administratively down down
FastEthernet1/0 unassigned YES unset up up
FastEthernet1/1 unassigned YES unset up down
FastEthernet1/2 unassigned YES unset up down
FastEthernet1/3 unassigned YES unset up down
FastEthernet1/4 unassigned YES unset up down
FastEthernet1/5 unassigned YES unset up down
FastEthernet1/6 unassigned YES unset up down
FastEthernet1/7 unassigned YES unset up down
FastEthernet1/8 unassigned YES unset up down
FastEthernet1/9 unassigned YES unset up down
FastEthernet1/10 unassigned YES unset up down
FastEthernet1/11 unassigned YES unset up down
FastEthernet1/12 unassigned YES unset up down
FastEthernet1/13 unassigned YES unset up down
FastEthernet1/14 unassigned YES unset up down
FastEthernet1/15 unassigned YES unset up down
Vlan1 unassigned YES unset up up
Vlan10 192.168.10.1 YES manual up up
Vlan20 192.168.20.1 YES manual up upPING 测试
PC1> ip 192.168.10.10 192.168.10.1
Checking for duplicate address...
PC1 : 192.168.10.10 255.255.255.0 gateway 192.168.10.1
PC1> ping 192.168.20.10
192.168.20.10 icmp_seq=1 timeout
84 bytes from 192.168.20.10 icmp_seq=2 ttl=63 time=14.115 ms
84 bytes from 192.168.20.10 icmp_seq=3 ttl=63 time=18.948 ms
84 bytes from 192.168.20.10 icmp_seq=4 ttl=63 time=18.066 ms
84 bytes from 192.168.20.10 icmp_seq=5 ttl=63 time=11.972 msPC2> ip 192.168.20.10 192.168.20.1
Checking for duplicate address...
PC1 : 192.168.20.10 255.255.255.0 gateway 192.168.20.1
PC2> ping 192.168.10.10
84 bytes from 192.168.10.10 icmp_seq=1 ttl=63 time=20.966 ms
84 bytes from 192.168.10.10 icmp_seq=2 ttl=63 time=16.993 ms
84 bytes from 192.168.10.10 icmp_seq=3 ttl=63 time=14.945 ms
84 bytes from 192.168.10.10 icmp_seq=4 ttl=63 time=16.883 ms
84 bytes from 192.168.10.10 icmp_seq=5 ttl=63 time=18.054 ms实现了不同网段，不同
vlan互通。
最后
关于GNS3一些实验操作就暂告一段落了，最近几篇实验写的有点仓促，只写了主体部分，后期会慢慢会优化。
有关网络的基础知识原理之类的，等有空也会整理一波，巩固一下知识。