菜鸟求大神解决，两台二层交换机做了trunk，就是不通。里面就创建2个vlan。难道模拟器有问题？
\u54ea\u4f4d\u5927\u795e\u5e2e\u5e2e\u5fd9\u5427\uff0cvlan\u5df2\u7ecf\u5212\u5206\u597d\u4e86\uff0c\u4ea4\u6362\u673a\u4e5f\u914d\u7f6e\u6210trunk\u6a21\u5f0f\u4e86\uff0c\u8def\u7531\u5668\u5e94\u8be5\u600e\u6837\u914d\u7f6e\u554a\uff0c\u5b9e\u5728\u662f\u82e6\u607c\u9996\u5148\u4f60\u4ea4\u6362\u673aA\u3001B\u3001C\u4e4b\u95f4\u76f8\u8fde\u7684\u7aef\u53e3\u90fd\u5fc5\u987b\u4fdd\u8bc1\u662fTrunk\u6a21\u5f0f\uff0c\u518d\u628a\u4ea4\u6362\u673aB\u548c\u8def\u7531\u5668\u76f8\u8fde\u7684\u7aef\u53e3\u4e5f\u914d\u5236\u6210Trunk\u6a21\u5f0f\uff0c\u7136\u540e\u8def\u7531\u5668\u914d\u7f6e\u5982\u4e0b\uff1a
interface FastEthernet0/0 \u8def\u7531\u5668\u548c\u4ea4\u6362\u673aB\u76f8\u8fde\u7684\u7aef\u53e3
no shutdown
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 192.168.1.254 255.255.255.0 Vlan10\u7684ip\u7f51\u5173
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 192.168.2.254 255.255.255.0 Vlan20\u7684ip\u7f51\u5173
interface FastEthernet0/0.20
encapsulation dot1Q 30
ip address 192.168.3.254 255.255.255.0 Vlan30\u7684ip\u7f51\u5173
TRUNK\u662f\u7aef\u53e3\u6c47\u805a\u7684\u610f\u601d\uff0c\u5141\u8bb8\u4ea4\u6362\u673a\u4e0e\u4ea4\u6362\u673a\u3001\u4ea4\u6362\u673a\u4e0e\u8def\u7531\u5668\u3001\u4e3b\u673a\u4e0e\u4ea4\u6362\u673a\u6216\u8def\u7531\u5668\u4e4b\u95f4\u901a\u8fc7\u4e24\u4e2a\u6216\u591a\u4e2a\u7aef\u53e3\u5e76\u884c\u8fde\u63a5\u540c\u65f6\u4f20\u8f93\u4ee5\u63d0\u4f9b\u66f4\u9ad8\u5e26\u5bbd\u3001\u66f4\u5927\u541e\u5410\u91cf\uff0c \u5927\u5e45\u5ea6\u63d0\u4f9b\u6574\u4e2a\u7f51\u7edc\u80fd\u529b\u3002
VLAN TRUNK\u4e00\u822c\u662f\u4f60\u8bbe\u7f6e\u4e86\u591a\u4e2aVLAN\u540e\uff0c\u60f3\u901a\u8fc7\u4e00\u4e2a\u7aef\u53e3\u4f20\u8f93\u591a\u4e2aVLAN\uff0c\u8fd9\u4e2a\u540e\u9700\u8981\u628a\u8be5\u7aef\u53e3\u8bbe\u7f6e\u4e3aTRUNK\u4e86\u3002
交换机和交换机之间应该用交叉线。
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