VLAN基础配置实验解析实验拓扑说明交换机S11楼连接PC-1VLAN10、PC-2VLAN10、PC-3VLAN20与S2通过E0/0/5互联。交换机S22楼连接PC-4VLAN30、PC-5VLAN40与S1通过E0/0/5互联。VLAN配置核心步骤交换机S1配置vlan 10 vlan 20 interface Ethernet 0/0/1 port link-type access port default vlan 10 interface Ethernet 0/0/2 port link-type access port default vlan 10 interface Ethernet 0/0/3 port link-type access port default vlan 20 interface Ethernet 0/0/5 port link-type trunk port trunk allow-pass vlan 10 20 30 40交换机S2配置vlan 30 vlan 40 interface Ethernet 0/0/1 port link-type access port default vlan 30 interface Ethernet 0/0/2 port link-type access port default vlan 40 interface Ethernet 0/0/5 port link-type trunk port trunk allow-pass vlan 10 20 30 40关键验证命令display vlan检查VLAN划分及接口归属。display port vlan确认接口工作模式access/trunk。display interface brief查看接口物理状态UP/DOWN。实验现象分析同VLAN通信PC-1192.168.1.1与PC-2192.168.1.2均属于VLAN10二层互通ping测试成功。不同VLAN隔离PC-1VLAN10无法ping通PC-3VLAN20因二层隔离需通过三层设备路由。Trunk链路作用S1与S2的E0/0/5接口配置为Trunk允许VLAN10/20/30/40的标签帧跨交换机传输。补充概念Access接口连接终端设备如PC仅承载单个VLAN流量不添加VLAN标签。Trunk接口用于交换机间互联通过VLAN标签区分流量允许多个VLAN数据透传。故障排查提示若通信异常需检查接口物理状态display interface brief。VLAN划分与接口绑定display vlan。Trunk允许的VLAN列表是否匹配display port vlan。