经典:VLAN配置实例 |
作者: http://cisco.ccxx.net |
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| 经典:VLAN配置实例
| (1)网络基本情况 网络拓扑结构为:中心交换机采用Cisco Catalyst 4006-S3,Supervisor Engine III G引擎位于第1插槽,用于实现三层交换;1块24口1000Base-T模块位于第2插槽,用于连接网络服务器;1块6端口1000Base-X模块位于第3插槽,用于连接6台骨干交换机。一台交换机采用Cisco Catalyst 3550-24-EMI,并安装1块1000Base-X GBIC千兆模块。一台交换机采用Cisco Catalyst 3550-24-SMI,也安装1块1000Base-X GBIC千兆模块。另外四台交换机采用Cisco Catalyst 2950G-24-SMI,安装1块1000Base-T GBIC千兆模块。 所有服务器划分为一个VLAN,即VLAN 50。四台Catalyst 2950G-24-SMI交换机也只划分为一个VLAN,分别为VLAN 60、VLAN 70、VLAN 80和VLAN 90。Catalyst 3550-24-EMI划分为4个VLAN,分别为VLAN 10、VLAN 20、VLAN 30和VLAN 40。Catalyst 3550-24-SMI划分2个VLAN,分别为VLAN 60和VLAN 80,与另外两台Catalyst 2950G-24-SMI交换机分别位于同一VLAN。 (2)实例分析 由于所有Catalyst 2950G交换机都是一个独立的VLAN,因此,必须先在这些交换机上创建VLAN(VLAN 60~VLAN 90),并将所有端口都指定至该VLAN。然后,再在Catalyst 4006交换机相应端口上分别创建VLAN。Catalyst 4006的1000Base-X端口分别与各Catalyst 2950G的1000Base-X端口连接。其中,GigabitEthernet3/2端口连接至1号Catalyst 2950交换机(VLAN 60),GigabitEthernet3/3端口连接至2号Catalyst 2950交换机(VLAN 70),GigabitEthernet3/4端口连接至3号Catalyst 2950交换机(VLAN 80),GigabitEthernet3/5端口连接至4号Catalyst 2950交换机(VLAN 90),GigabitEthernet3/6端口连接至6号楼交换机(VLAN 80)。 由于在Catalyst 3550-24-EMI上划分有4个VLAN(VLAN 10~VLAN 40),而4个VLAN都需借助于一条1000Base-X链路实现与Catalyst 4006的GigabitEthernet3/1端口连接,因此,必须在Catalyst 4006与Catalyst 3550-24- EMI之间创建一个Trunk。 同样,在Catalyst 3550-24-SMI上划分有2个VLAN(VLAN 60和VLAN 80),而4个VLAN都需借助于一条1000Base-X链路实现与Catalyst 4006的GigabitEthernet3/6端口连接,因此,必须在Catalyst 4006与Catalyst 3550-24- EMI之间创建一个Trunk。 另外,所有服务器均连接至Catalyst 4006的1000Base-T模块,并单独成为一个VLAN(VLAN 90),因此,也必须为这些交换机创建一个VLAN,并将所有端口指定至该VLAN。需要注意的是,考虑到网络管理的需要,也可以剩余几个RJ-45端口(如21至24端口)不指定至任何VLAN,从而便于连接网络管理设备。默认状态下,所有端口都属于VLAN1,而且也只有在VLAN1中才能实现对网络中所有设备的管理。 (3)配置清单 ●Cisco Catalyst 4006交换机配置清单 Current configuration : 5594 bytes ! version 12.1 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption service compress-config ! hostname hsnc ! boot system bootflash:cat4000-is-mz.121-8a.EW1.bin no logging console enable secret level 1 5 $1$rkQW$1HKyKdN5f.Ri5zxeoF8Yv/ ! ip subnet-zero ! ! ! interface GigabitEthernet1/1 no snmp trap link-status !--不为Supervisor Engine III G引擎中的1000Base-X插槽指定VLAN interface GigabitEthernet1/2 no snmp trap link-status ! ! interface GigabitEthernet2/1 switchport access vlan 50 no snmp trap link-status !--将端口GigabitEthernet2/1指定至VLAN 50 ! interface GigabitEthernet2/2 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/3 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/4 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/5 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/6 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/7 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/8 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/9 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/10 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/11 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/12 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/13 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/14 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/15 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/16 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/17 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/18 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/19 switchport access vlan 50 no snmp trap link-status ! interface GigabitEthernet2/20 switchport access vlan 50 no snmp trap link-status !--不将GigabitEthernet2/20~24指定至任何VLAN ! interface GigabitEthernet3/1 switchport trunk encapsulation dot1q !--启用802.1Q Trunk封装协议,即在该端口创建Trunk switchport trunk allowed vlan 1-80 !--允许vlan 1-90在该中继线通讯 !--可以拒绝或允许某个VLAN访问该Trunk !--确保未被授权的VLAN通过该Trunk,实现VLAN的访问安全 switchport mode trunk !--将该端口设置为Trunk description netcenter no snmp trap link-status ! interface GigabitEthernet3/2 switchport access vlan 60 no snmp trap link-status !--将端口GigabitEthernet3/2指定至VLAN 60 ! interface GigabitEthernet3/3 switchport access vlan 70 no snmp trap link-status !--将端口GigabitEthernet3/3指定至VLAN 70 ! interface GigabitEthernet3/4 switchport access vlan 80 no snmp trap link-status !--将端口GigabitEthernet3/4指定至VLAN 80 ! interface GigabitEthernet3/5 switchport access vlan 90 no snmp trap link-status !--将端口GigabitEthernet3/5指定至VLAN 90 ! interface GigabitEthernet3/6 switchport trunk encapsulation dot1q !--启用802.1Q Trunk封装协议,即在该端口创建Trunk switchport trunk allowed vlan 1-80 !--允许vlan 1-90在该中继线通讯 !--可以拒绝或允许某个VLAN访问该Trunk !--从而确保未被授权的VLAN通过该Trunk,实现VLAN访问安全 switchport mode trunk !--将该端口设置为Trunk description netcenter no snmp trap link-status ! interface Vlan1 description netmanger no ip address ! !--对VLAN1进行描述 interface Vlan10 description network center no ip address !--对VLAN2进行描述 ! interface Vlan20 description computer center no ip address ! interface Vlan30 description network lab no ip address ! interface Vlan40 description huaxuelou no ip address ! interface Vlan50 description wulilou no ip address ! interface Vlan60 description shengwulou no ip address ! interface Vlan70 description zhongwenxi no ip address ! interface Vlan80 description tushuguan no ip address ! ! line con 0 stopbits 1 line vty 0 4 password aaa login ! end ●Cisco Catalyst 3550-EMI配置清单 Building configuration... Current configuration : 4055 bytes
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