PT上做实验，思科交换机中，先配置trunk再配置vlan，网络会不通 cisco交换机在配置vlan的主干端口时，为什么要先配置封...
\u601d\u79d1\u4ea4\u6362\u673a\u914d\u7f6etrunk\u9047\u5230\u7684\u95ee\u9898\u600e\u4e48\u89e3\u51b3\uff1f\u601d\u79d1\u7684\u4ea4\u6362\u673a\u63a5\u53e3\u5728\u914d\u7f6etrunk\u7684\u65f6\u5019\u9700\u8981\u5148\u8fdb\u884c\u5c01\u88c5dot1q\u7684\uff0c\u5728\u63a5\u53e3\u4e0b\u9762\u4f7f\u7528\u4ee5\u4e0b\u4e24\u4e2a\u547d\u4ee4\u5c31\u53ef\u4ee5\u5b9e\u73b0\u4e86\uff0c\u6ce8\u610f\u5148\u540e\u987a\u5e8f \u3002interface GigabitEthernet1/0/25switchport trunk encapsulation dot1qswitchport mode trunk
\u4ea4\u6362\u673a\u914d\u7f6eTRUNK\u65f6\u7684\u6ce8\u610f\u4e8b\u9879\uff1a
\u5728\u4e00\u4e2aTRUNK\u4e2d\uff0c\u6570\u636e\u603b\u662f\u4ece\u4e00\u4e2a\u7279\u5b9a\u7684\u6e90\u70b9\u5230\u76ee\u7684\u70b9\uff0c\u4e00\u6761\u5355\u4e00\u7684\u94fe\u8def\u88ab\u8bbe\u8ba1\u53bb\u5904\u7406\u5e7f\u64ad\u5305\u6216\u4e0d\u77e5\u76ee\u7684\u5730\u7684\u5305\u3002\u5728\u4ea4\u6362\u673a\u914d\u7f6eTRUNK\u65f6\uff0c\u5fc5\u987b\u9075\u5faa\u4e0b\u5217\u89c4\u5219\uff1a
1\uff1a\u6b63\u786e\u9009\u62e9TRUNK\u7684\u7aef\u53e3\u6570\u76ee\uff0c\u5fc5\u987b\u662f2\uff0c4\u62168\u3002
2\uff1a\u5fc5\u987b\u4f7f\u7528\u540c\u4e00\u7ec4\u4e2d\u7684\u7aef\u53e3\uff0c\u5728\u4ea4\u6362\u673a\u4e0a\u7684\u7aef\u53e3\u5206\u6210\u4e86\u51e0\u4e2a\u7ec4\uff0cTRUNK\u7684\u6240\u6709\u7aef\u53e3\u5fc5\u987b\u6765\u81ea\u540c\u4e00\u7ec4\u3002
3\uff1a\u4f7f\u7528\u8fde\u7eed\u7684\u7aef\u53e3;TRUNK\u4e0a\u7684\u7aef\u53e3\u5fc5\u987b\u8fde\u7eed\uff0c\u5982\u4f60\u53ef\u4ee5\u7528\u7aef\u53e34\uff0c5\uff0c6\u548c7\u7ec4\u5408\u6210\u4e00\u4e2a\u7aef\u53e3\u6c47\u805a\u3002
4\uff1a\u5728\u4e00\u7ec4\u7aef\u53e3\u53ea\u4ea7\u751f\u4e00\u4e2aTRUNK\u3002
\u5212\u5206vlan\uff0c\u4e0d\u540cvlan\u8981\u4f20\u9012\uff0c\u9700\u8981trunk\u94fe\u8def\uff0c\u6765\u4e8c\u5c42\u7684tag\u5e27\u3002\u3002\u3002
进入trunk的物理接口使用命令switchport trunk allowed vlan add X （X为新创建的vlan ID）
或者
switchport trunk allowed vlan all
绛旓細杩涘叆trunk鐨勭墿鐞嗘帴鍙ｄ娇鐢ㄥ懡浠 switchport trunk allowed vlan add X 锛圶涓烘柊鍒涘缓鐨剉lan ID锛夋垨鑰 switchport trunk allowed vlan all
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