实验目的:
1、掌握Trunk的基础配置。
2、理解Trunk的功能。
实验拓扑:
实验步骤:
1、依据图中拓扑配置4台主机的IP地址,其中PC通过路由器模拟,配置如下:
PC1(config)#int f0/0 PC1(config-if)#no shutdown PC1(config-if)#ip address 192.168.1.1 255.255.255.0 PC1(config-if)#exit PC2(config)#int f0/0 PC2(config-if)#no shutdown PC2(config-if)#ip address 192.168.1.2 255.255.255.0 PC2(config-if)#exit PC3(config)#int f0/0 PC3(config-if)#no shutdown PC3(config-if)#ip address 192.168.2.3 255.255.255.0 PC3(config-if)#exit PC4(config)#int f0/0 PC4(config-if)#no shutdown PC4(config-if)#ip address 192.168.2.4 255.255.255.0 PC4(config-if)#exit
2、根据图中拓扑,在交换机SW1和SW2上创建VLAN,然后将接口放置到对应VLAN中,如下=>
SW1上配置:
SW1#vlan database SW1(vlan)#vlan 10 name VLAN_10 SW1(vlan)#vlan 20 name VLAN_20 SW1(vlan)#exit SW1(config)#int f0/2 SW1(config-if-range)#switchport mode access SW1(config-if-range)#switchport access vlan 10 SW1(config-if-range)#exit SW1(config)#int f0/3 SW1(config-if-range)#switchport mode access SW1(config-if-range)#switchport access vlan 20 SW1(config-if-range)#exit
SW2上配置:
SW2#vlan database SW2(vlan)#vlan 10 name VLAN_10 SW2(vlan)#vlan 20 name VLAN_20 SW2(vlan)#exit SW2(config)#int f0/2 SW2(config-if-range)#switchport mode access SW2(config-if-range)#switchport access vlan 10 SW2(config-if-range)#exit SW2(config)#int f0/3 SW2(config-if-range)#switchport mode access SW2(config-if-range)#switchport access vlan 20 SW2(config-if-range)#exit
查看VLAN信息,如下:
SW1#show vlan-switch brief VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1,Fa0/4, Fa0/5, Fa0/6, Fa0/7 Fa0/8, Fa0/9, Fa0/10, Fa0/11 Fa0/12, Fa0/13, Fa0/14, Fa0/15 10 VLAN_10 active Fa0/2 20 VLAN_20 active Fa0/3 1002 fddi-default active 1003 token-ring-default active 1004 fddinet-default active 1005 trnet-default active SW2#show vlan-switch brief VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1,Fa0/4, Fa0/5, Fa0/6, Fa0/7 Fa0/8, Fa0/9, Fa0/10, Fa0/11 Fa0/12, Fa0/13, Fa0/14, Fa0/15 10 VLAN0010 active Fa0/2 20 VLAN0020 active Fa0/3 1002 fddi-default active 1003 token-ring-default active 1004 fddinet-default active 1005 trnet-default active
此时,SW1和SW2上不同交换机已经创建,并且不同接口放置在对应VLAN中。
3、部署Trunk技术,SW1配置如下:
SW1(config)#int f0/0 SW1(config-if)#switchport trunk encapsulation dot1q SW1(config-if)#switchport mode trunk SW1(config-if)#exit
SW2配置如下:
SW2(config)#int f0/0 SW2(config-if)#switchport trunk encapsulation dot1q SW2(config-if)#switchport mode trunk SW2(config-if)#exit
查看Trunk链路状态,如下:
SW1#show interfaces trunk Port Mode Encapsulation Status Native vlan Fa0/0 on 802.1q trunking 1 Port Vlans allowed on trunk Fa0/0 1-1005 Port Vlans allowed and active in management domain Fa0/0 1,10,20 Port Vlans in spanning tree forwarding state and not pruned Fa0/0 1,10,20
此时Trunk链路已经起来。
4.测试通过部署Trunk链路,VLAN10和VLAN20的数据能否经过Trunk,如下:
PC1#ping 192.168.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 32/42/64 ms PC3#ping 192.168.2.4 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.4, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 44/56/68 ms
从以上可以看到,Trunk链路可以同时承载不同VLAN的流量,相比之前“一个VLAN一根网线”的解决方案,Trunk方案不仅部署方便,而且非常节省端口资源,做到“n个VLAN一根网线”。当然,由于Trunk链路默认承载所有VLAN流量,会有很多垃圾流量在上面,这就需要实现Trunk优化。此实验完成。
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