实验51: 三层交换实现VLAN 间路由
1. 实验目的
通过本实验，读者可以掌握如下技能：
（1） 理解三层交换的概念
（2） 配置三层交换
2. 实验拓扑
拓扑图
3. 实验步骤
注：用SW1 来实现分别处于VLAN1 和VLAN2 的PC0 和PC1 间的通信。
要在三层交换机上启用路由功能，还需要启用CEF（命令为：ip cef），不过这是
默认值。和路由器一样，三层交换机上同样可以运行路由协议。
sw1#vlan da
% Warning: It is recommended to configure VLAN from config mode,
as VLAN database mode is being deprecated. Please consult user
documentation for configuring VTP/VLAN in config mode.
sw1(vlan)#vlan 2 name cisco
VLAN 2 added:
Name: cisco
sw1(vlan)#exit
APPLY completed.
Exiting....
sw1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
sw1(config)#int vlan 1
sw1(config-if)#ip add 172.16.1.1 255.255.255.0//在vlan 接口上配置IP 地址即可，VLAN 1 接口上的地址就是PC0 的网关了，VLAN 2 接口上的地址就是PC1的网关了。
sw1(config-if)#no sh
%LINK-5-CHANGED: Interface Vlan1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up
sw1(config-if)#
sw1(config-if)#exit
sw1(config)#int vlan 2
%LINK-5-CHANGED: Interface Vlan2, changed state to upsw1(config-if)#
sw1(config-if)#ip add 172.16.2.1 255.255.255.0
sw1(config-if)#no sh
sw1(config-if)#exit
sw1(config)#int f0/2
sw1(config-if)#switch mode access
sw1(config-if)#switch access vlan 2
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to upsw1(config-if)#
sw1(config-if)#exit
sw1(config)#ip routing//以上开启SW1 的路由功能，这时SW1 就启用了三层功能。
sw1(config)#
sw1(config)#do sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, Vlan1
C 172.16.2.0 is directly connected, Vlan2
//和路由器一样，三层交换机上也有路由表。
PC0:
PC>ipconfig
IP Address......................: 172.16.1.2
Subnet Mask.....................: 255.255.255.0
Default Gateway.................: 172.16.1.1
PC>ping 172.16.2.2
Pinging 172.16.2.2 with 32 bytes of data:
Reply from 172.16.2.2: bytes=32 time=109ms TTL=127
Reply from 172.16.2.2: bytes=32 time=62ms TTL=127
Reply from 172.16.2.2: bytes=32 time=63ms TTL=127
Reply from 172.16.2.2: bytes=32 time=63ms TTL=127
Ping statistics for 172.16.2.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 62ms, Maximum = 109ms, Average = 74ms
PC>
PC1:
PC>ipconfig
IP Address......................: 172.16.2.2
Subnet Mask.....................: 255.255.255.0
Default Gateway.................: 172.16.2.1
PC>ping 172.16.1.2
Pinging 172.16.1.2 with 32 bytes of data:
Reply from 172.16.1.2: bytes=32 time=62ms TTL=127
Reply from 172.16.1.2: bytes=32 time=62ms TTL=127
Reply from 172.16.1.2: bytes=32 time=62ms TTL=127
Reply from 172.16.1.2: bytes=32 time=62ms TTL=127
Ping statistics for 172.16.1.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 62ms, Maximum = 62ms, Average = 62ms
PC>
本文转自gauyanm 51CTO博客，原文链接：http://blog.51cto.com/gauyanm/245116，如需转载请自行联系原作者