{"id":2349,"date":"2017-06-19T22:33:33","date_gmt":"2017-06-19T14:33:33","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=2349"},"modified":"2017-06-22T16:23:01","modified_gmt":"2017-06-22T08:23:01","slug":"stp%e5%8d%8f%e8%ae%ae%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/yidong\/stp%e5%8d%8f%e8%ae%ae%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86\/","title":{"rendered":"\u4ea4\u6362\u673a\u751f\u6210\u6811\u534f\u8bae\u5de5\u4f5c\u539f\u7406"},"content":{"rendered":"<p>STP\u7684\u57fa\u672c\u539f\u7406\u662f\uff0c\u901a\u8fc7\u5728\u4ea4\u6362\u673a\u4e4b\u95f4\u4f20\u9012\u4e00\u79cd\u7279\u6b8a\u7684\u534f\u8bae\u62a5\u6587\uff0c\u7f51\u6865\u534f\u8bae\u6570\u636e\u62a5\u6587\uff08Bridge Protocol Data Unit\uff0c\u7b80\u79f0BPDU\uff09\uff0c\u6765\u786e\u5b9a\u7f51\u7edc\u7684\u62d3\u6251\u7ed3\u6784\u3002BPDU\u6709\u4e24\u79cd\uff0c\u914d\u7f6eBPDU\uff08Configuration BPDU\uff09\u548cTCN BPDU\u3002\u524d\u8005\u662f\u7528\u4e8e\u8ba1\u7b97\u65e0\u73af\u7684\u751f\u6210\u6811\u7684\uff0c\u540e\u8005\u5219\u662f\u7528\u4e8e\u5728\u4e8c\u5c42\u7f51\u7edc\u62d3\u6251\u53d1\u751f\u53d8\u5316\u65f6\u4ea7\u751f\u7528\u6765\u7f29\u77edMAC\u8868\u9879\u7684\u5237\u65b0\u65f6\u95f4\u7684\uff08\u7531\u9ed8\u8ba4\u7684300s\u7f29\u77ed\u4e3a15s\uff09\u3002<\/p>\n<p>Spanning Tree Protocol(STP)\u5728IEEE802.1D\u6587\u6863\u4e2d\u5b9a\u4e49\u3002\u8be5\u534f\u8bae\u7684\u539f\u7406\u662f\u6309\u7167\u6811\u7684\u7ed3\u6784\u6765\u6784\u9020\u7f51\u7edc\u62d3\u6251\uff0c\u6d88\u9664\u7f51\u7edc\u4e2d\u7684\u73af\u8def\uff0c\u907f\u514d\u7531\u4e8e\u73af\u8def\u7684\u5b58\u5728\u800c\u9020\u6210\u5e7f\u64ad\u98ce\u66b4\u95ee\u9898\u3002<\/p>\n<p>Spanning Tree Protocol(STP)\u7684\u57fa\u672c\u601d\u60f3\u5c31\u662f\u6309\u7167&#8221;\u6811&#8221;\u7684\u7ed3\u6784\u6784\u9020\u7f51\u7edc\u7684\u62d3\u6251\u7ed3\u6784\uff0c\u6811\u7684\u6839\u662f\u4e00\u4e2a\u79f0\u4e3a\u6839\u6865\u7684\u6865\u8bbe\u5907\uff0c\u6839\u6865\u7684\u786e\u7acb\u662f\u7531\u4ea4\u6362\u673a\u6216\u7f51\u6865\u7684BID\uff08Bridge ID\uff09\u786e\u5b9a\u7684\uff0cBID\u6700\u5c0f\u7684\u8bbe\u5907\u6210\u4e3a\u4e8c\u5c42\u7f51\u7edc\u4e2d\u7684\u6839\u6865\u3002BID\u53c8\u662f\u7531\u7f51\u6865\u4f18\u5148\u7ea7\u548cMAC\u5730\u5740\u6784\u6210\uff0c\u4e0d\u540c\u5382\u5546\u7684\u8bbe\u5907\u7684\u7f51\u6865\u4f18\u5148\u7ea7\u7684\u5b57\u8282\u4e2a\u6570\u53ef\u80fd\u4e0d\u540c\u3002\u7531\u6839\u6865\u5f00\u59cb\uff0c\u9010\u7ea7\u5f62\u6210\u4e00\u68f5\u6811\uff0c\u6839\u6865\u5b9a\u65f6\u53d1\u9001\u914d\u7f6eBPDU\uff0c\u975e\u6839\u6865\u63a5\u6536\u914d\u7f6eBPDU\uff0c\u5237\u65b0\u6700\u4f73BPDU\u5e76\u8f6c\u53d1\u3002\u8fd9\u91cc\u7684\u6700\u4f73BPDU\u6307\u7684\u662f\u5f53\u524d\u6839\u6865\u6240\u53d1\u9001\u7684BPDU\u3002\u5982\u679c\u63a5\u6536\u5230\u4e86\u4e0b\u7ea7BPDU\uff08\u65b0\u63a5\u5165\u7684\u8bbe\u5907\u4f1a\u53d1\u9001BPDU\uff0c\u4f46\u8be5\u8bbe\u5907\u7684BID\u6bd4\u5f53\u524d\u6839\u6865\u5927\uff09\uff0c\u63a5\u6536\u5230\u8be5\u4e0b\u7ea7BPDU\u7684\u8bbe\u5907\u5c06\u4f1a\u5411\u65b0\u63a5\u5165\u7684\u8bbe\u5907\u53d1\u9001\u81ea\u5df1\u5b58\u50a8\u7684\u6700\u4f73BPDU\uff0c\u4ee5\u544a\u77e5\u5176\u5f53\u524d\u7f51\u7edc\u4e2d\u6839\u6865\uff1b\u5982\u679c\u63a5\u6536\u5230\u7684BPDU\u66f4\u4f18\uff0c\u5c06\u4f1a\u91cd\u65b0\u8ba1\u7b97\u751f\u6210\u6811\u62d3\u6251\u3002\u5f53\u975e\u6839\u6865\u5728\u79bb\u4e0a\u4e00\u6b21\u63a5\u6536\u5230\u6700\u4f73BPDU\u6700\u957f\u5bff\u547d\uff08Max Age\uff0c\u9ed8\u8ba420s\uff09\u540e\u8fd8\u6ca1\u6709\u63a5\u6536\u5230\u6700\u4f73BPDU\u7684\u65f6\u5019\uff0c\u8be5\u7aef\u53e3\u5c06\u8fdb\u5165\u76d1\u542c\u72b6\u6001\uff0c\u8be5\u8bbe\u5907\u5c06\u4ea7\u751fTCN BPDU\uff0c\u5e76\u4ece\u6839\u7aef\u53e3\u8f6c\u53d1\u51fa\u53bb\uff0c\u4ece\u6307\u5b9a\u7aef\u53e3\u63a5\u6536\u5230TCN BPDU\u7684\u4e0a\u7ea7\u8bbe\u5907\u5c06\u53d1\u9001\u786e\u8ba4\uff0c\u7136\u540e\u518d\u5411\u4e0a\u7ea7\u8bbe\u5907\u53d1\u9001TCN BPDU\uff0c\u6b64\u8fc7\u7a0b\u6301\u7eed\u5230\u6839\u6865\u4e3a\u6b62\uff0c\u7136\u540e\u6839\u6865\u5728\u5176\u540e\u53d1\u9001\u7684\u914d\u7f6eBPDU\u4e2d\u5c06\u643a\u5e26\u6807\u8bb0\u8868\u660e\u62d3\u6251\u5df2\u53d1\u751f\u53d8\u5316\uff0c\u7f51\u7edc\u4e2d\u7684\u6240\u6709\u8bbe\u5907\u63a5\u6536\u5230\u540e\u5c06CAM\u8868\u9879\u7684\u5237\u65b0\u65f6\u95f4\u4ece300s\u7f29\u77ed\u4e3a15s\u3002\u6574\u4e2a\u6536\u655b\u7684\u65f6\u95f4\u4e3a50s\u5de6\u53f3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>STP\u7684\u57fa\u672c\u539f\u7406\u662f\uff0c\u901a\u8fc7\u5728\u4ea4\u6362\u673a\u4e4b\u95f4\u4f20\u9012\u4e00\u79cd\u7279\u6b8a\u7684\u534f\u8bae\u62a5\u6587\uff0c\u7f51\u6865\u534f\u8bae\u6570\u636e\u62a5\u6587\uff08Bridge Protocol  &#8230; 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