中财网2k4复刻2016年减配了吗:三层交换机实现VLAN互通实例
来源：百度文库 编辑：中财网 时间：2024/04/29 00:32:06
实验拓扑:
实验步骤
v在2层交换机上配置VLAN
SW-2L(config)#VLAN 2
SW-2L(config-VLAN)#VLAN 3
SW-2L(config-VLAN)#exit
配置所需要的接口加入到VLAN中
SW-2L(config)#interface range f0/2
SW-2L(config-if-range)#switchport mode access
SW-2L(config-if-range)#switchport access VLAN 2
SW-2L(config)#interface range f0/3
SW-2L(config-if-range)#switchport mode access
SW-2L(config-if-range)#switchport access VLAN 3
v在2层交换机上配制Trunk接口
SW-2L(config)#interface f0/1
SW-2L(config-if)#switchport mode trunk
v 在3层交换机上配置与2层交换机相同的VLAN(配置步骤与方法相同，也可以配置一台交换机为VTP域服务器，其它交换机为VTP域客户端来自动学习VLAN信息)
SW-3L(config)#VLAN database
SW-3L(config-VLAN)#VLAN 2
SW-3L(config-VLAN)#VLAN 3
SW-3L(config-VLAN)#exit
v在3层交换机上配置中继接口
SW-3L(config)#interface f0/1
SW-3L(config-if)#switchport trunk encapsulation dot1q
SW-3L(config-if)#switchport mode trunk
v在3层交换机上启动路由
SW-3L(config)#ip routing
v在3层交换机上配置各VLAN的IP地址
SW-3L(config)#interface VLAN 1
SW-3L(config-if)#ip address 192.168.1.1 255.255.255.0
SW-3L(config-if)#no shut
SW-3L(config)#interface VLAN 2
SW-3L(config-if)#ip address 192.168.2.1 255.255.255.0
SW-3L(config-if)#no shut
SW-3L(config)#interface VLAN 3
SW-3L(config-if)#ip address 192.168.3.1 255.255.255.0
SW-3L(config-if)#no shut
v在3层交换机上查看路由表
SW-3L#show ip route
SW-3L #sh ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, 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
C 192.168.1.0/24 is directly connected, VLAN1
C 192.168.2.0/24 is directly connected, VLAN2
C 192.168.3.0/24 is directly connected, VLAN3
v在主机192.168.2.2上ping 192.168.3.2
在这里，主机也是用路由器模拟的，这里举一台的配置为例：
Router#conf t
Router(config)#host PC2
PC2(config)#int f0/2
PC2(config-if)#no sw
PC2(config-if)#ip add 192.168.2.2 255.255.255.0
PC2(config-if)#no shut
PC2(config-if)#exit
PC2(config)#ip default-ga 192.168.2.1
PC2(config)#no ip routing
PC2#ping 192.168.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 96/143/232 ms
v查看FIB (FIB，即转发信息库。从概念上看，FIB类似于路由表，包含路由表中的转发信息的镜像)
SW-3L#show ip cef ( 查看FIB表)
SW-3L #sh ip cef
Prefix Next Hop Interface
0.0.0.0/0 drop Null0 (default route handler entry)
0.0.0.0/32 receive
192.168.1.0/24 attached VLAN1
192.168.1.0/32 receive
192.168.1.1/32 receive
192.168.1.2/32 192.168.1.2 VLAN1
192.168.1.255/32 receive
192.168.2.0/24 attached VLAN2
192.168.2.0/32 receive
192.168.2.1/32 receive
192.168.2.2/32 192.168.2.2 VLAN2
192.168.2.255/32 receive
192.168.3.0/24 attached VLAN3
192.168.3.0/32 receive
192.168.3.1/32 receive
192.168.3.2/32 192.168.3.2 VLAN3
192.168.3.255/32 receive
224.0.0.0/4 drop
224.0.0.0/24 receive
255.255.255.255/32 receive
SW-3L#show adjacency detail (查看邻接关系表)
SW-3L #sh adjacency detail
Protocol Interface Address
IP VLAN2 192.168.2.2(5)
20 packets, 2280 bytes
CC000924F002CC000CC800000800
ARP 03:53:59
Epoch: 0
IP VLAN3 192.168.3.2(5)
30 packets, 3420 bytes
CC0002D4F003CC000CC800000800
ARP 03:55:52
Epoch: 0
IP VLAN1 192.168.1.2(5)
10 packets, 1140 bytes
CC0008D4F004CC000CC800000800
ARP 03:57:06
Epoch: 0