VLAN基础实验2VLAN配置Trunk拓扑信息设备 接口 终端 IP地址 VLANS1 E0/0/2 PC‑1研发部 192.168.1.1 VLAN10S1 E0/0/3 PC‑2市场部 192.168.1.2 VLAN20S1 E0/0/1 对接S3 - TrunkS2 E0/0/3 PC‑3研发部 192.168.1.3 VLAN10S2 E0/0/4 PC‑4市场部 192.168.1.4 VLAN20S2 E0/0/2 对接S3 - TrunkS3 E0/0/1 对接S1 - TrunkS3 E0/0/2 对接S2 - Trunk实验原理Trunk中继链路实现不同交换机上相同VLAN主机二层互通Trunk接口默认仅放行VLAN1必须手动allow-pass放行业务VLAN。S1完整配置sysname S1vlan batch 10 20#PC‑1接入接口interface Ethernet 0/0/2port link-type accessport default vlan 10#PC‑2接入接口interface Ethernet 0/0/3port link-type accessport default vlan 20#上联S3的Trunk接口interface Ethernet 0/0/1port link-type trunkport trunk allow-pass vlan 10 20S2完整配置sysname S2vlan batch 10 20#PC‑3接入接口interface Ethernet 0/0/3port link-type accessport default vlan 10#PC‑4接入接口interface Ethernet 0/0/4port link-type accessport default vlan 20#上联S3的Trunk接口interface Ethernet 0/0/2port link-type trunkport trunk allow-pass vlan 10 20S3完整配置中间交换机sysname S3vlan batch 10 20#对接S1interface Ethernet 0/0/1port link-type trunkport trunk allow-pass vlan 10 20#对接S2interface Ethernet 0/0/2port link-type trunkport trunk allow-pass vlan 10 20验证命令display port vlan #查看接口链路类型、允许通过的VLANdisplay vlan #查看VLAN与接口绑定display interface brief实验现象✅ PC‑1(192.168.1.1) ping PC‑3(192.168.1.3)通跨交换机同VLAN通信✅ PC‑2(192.168.1.2) ping PC‑4(192.168.1.4)通跨交换机同VLAN通信❌ PC‑1 ping PC‑2 / PC‑4不通不同VLAN二层隔离关键知识点Trunk接口创建完成后Trunk VLAN List默认只有VLAN1业务VLAN不会自动放行必须配置port trunk allow-pass vlan 10 20Access接口接终端PCTrunk用于交换机之间互联携带VLAN标签转发数据帧。所有参与转发的交换机都需要创建对应的VLAN