我们公司有个三层交换机有一个端口VLAN4每天down一次，我怀疑是广播风暴导致假死机
\u5e7f\u64ad\u98ce\u66b4\u7684\u5f62\u6210\u539f\u56e0\u5e27\u7684\u4f20\u8f93\u65b9\u5f0f\uff0c\u5373\u5355\u64ad\u5e27\uff08Unicast Frame\uff09\u3001\u591a\u64ad\u5e27\uff08Multicast Frame\uff09\u548c\u5e7f\u64ad\u5e27\uff08Broadcast Frame\uff09\u30021\u3001\u5355\u64ad\u5e27\u5355\u64ad\u5e27\u4e5f\u79f0\u201c\u70b9\u5bf9\u70b9\u201d\u901a\u4fe1\u3002\u6b64\u65f6\u5e27\u7684\u63a5\u6536\u548c\u4f20\u9012\u53ea\u5728\u4e24\u4e2a\u8282\u70b9\u4e4b\u95f4\u8fdb\u884c\uff0c\u5e27\u7684\u76ee\u7684MAC\u5730\u5740\u5c31\u662f\u5bf9\u65b9\u7684MAC\u5730\u5740\uff0c\u7f51\u7edc\u8bbe\u5907\uff08\u6307\u4ea4\u6362\u673a\u548c\u8def\u7531\u5668\uff09\u6839\u636e\u5e27\u4e2d\u7684\u76ee\u7684MAC\u5730\u5740\uff0c\u5c06\u5e27\u8f6c\u53d1\u51fa\u53bb\u30022\u3001\u591a\u64ad\u5e27\u591a\u64ad\u5e27\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u4eba\u5411\u591a\u4e2a\u4eba\uff08\u4f46\u4e0d\u662f\u5728\u573a\u7684\u6240\u6709\u4eba\uff09\u8bf4\u8bdd\uff0c\u8fd9\u6837\u80fd\u591f\u63d0\u9ad8\u901a\u8bdd\u7684\u6548\u7387\u3002\u591a\u64ad\u5360\u7f51\u7edc\u4e2d\u7684\u6bd4\u91cd\u5e76\u4e0d\u591a\uff0c\u4e3b\u8981\u5e94\u7528\u4e8e\u7f51\u7edc\u8bbe\u5907\u5185\u90e8\u901a\u4fe1\u3001\u7f51\u4e0a\u89c6\u9891\u4f1a\u8bae\u3001\u7f51\u4e0a\u89c6\u9891\u70b9\u64ad\u7b49\u30023\u3001\u5e7f\u64ad\u5e27\u5e7f\u64ad\u5e27\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u4eba\u5bf9\u5728\u573a\u7684\u6240\u6709\u4eba\u8bf4\u8bdd\uff0c\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u901a\u8bdd\u6548\u7387\u9ad8\uff0c\u4fe1\u606f\u4e00\u4e0b\u5b50\u5c31\u53ef\u4ee5\u4f20\u9012\u5230\u5168\u4f53\u3002\u5728\u5e7f\u64ad\u5e27\u4e2d\uff0c\u5e27\u5934\u4e2d\u7684\u76ee\u7684MAC\u5730\u5740\u662f\u201cFF.FF.FF.FF.FF.FF\u201d\uff0c\u4ee3\u8868\u7f51\u7edc\u4e0a\u6240\u6709\u4e3b\u673a\u7f51\u5361\u7684MAC\u5730\u5740\u3002\u5e7f\u64ad\u5e27\u5728\u7f51\u7edc\u4e2d\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\uff0c\u5982\u5ba2\u6237\u673a\u901a\u8fc7DHCP\u81ea\u52a8\u83b7\u5f97IP\u5730\u5740\u7684\u8fc7\u7a0b\u5c31\u662f\u901a\u8fc7\u5e7f\u64ad\u5e27\u6765\u5b9e\u73b0\u7684\u3002\u800c\u4e14\uff0c\u7531\u4e8e\u8bbe\u5907\u4e4b\u95f4\u4e5f\u9700\u8981\u76f8\u4e92\u901a\u4fe1\uff0c\u56e0\u6b64\u5728\u7f51\u7edc\u4e2d\u5373\u4f7f\u6ca1\u6709\u7528\u6237\u4eba\u4e3a\u5730\u53d1\u9001\u5e7f\u64ad\u5e27\uff0c\u7f51\u7edc\u4e0a\u4e5f\u4f1a\u51fa\u73b0\u4e00\u5b9a\u6570\u91cf\u7684\u5e7f\u64ad\u5e27\u3002\u540c\u5355\u64ad\u548c\u591a\u64ad\u76f8\u6bd4\uff0c\u5e7f\u64ad\u51e0\u4e4e\u5360\u7528\u4e86\u5b50\u7f51\u5185\u7f51\u7edc\u7684\u6240\u6709\u5e26\u5bbd\u3002\u7f51\u7edc\u4e2d\u4e0d\u80fd\u957f\u65f6\u95f4\u51fa\u73b0\u5927\u91cf\u7684\u5e7f\u64ad\u5e27\uff0c\u5426\u5219\u5c31\u4f1a\u51fa\u73b0\u6240\u8c13\u7684\u201c\u5e7f\u64ad\u98ce\u66b4\u201d\uff08\u6bcf\u79d2\u7684\u5e7f\u64ad\u5e27\u6570\u57281000\u4ee5\u4e0a\uff09\u3002\u62ff\u5f00\u4f1a\u6253\u4e00\u4e2a\u6bd4\u65b9\uff0c\u5728\u4f1a\u573a\u4e0a\u53ea\u80fd\u6709\u4e00\u4e2a\u4eba\u53d1\u8a00\uff0c\u5982\u679c\u6240\u6709\u4eba\u90fd\u540c\u65f6\u53d1\u8a00\u7684\u8bdd\uff0c\u4f1a\u573a\u4e0a\u5c31\u4f1a\u4e71\u6210\u4e00\u9505\u7ca5\u3002\u5e7f\u64ad\u98ce\u66b4\u5c31\u662f\u7f51\u7edc\u957f\u65f6\u95f4\u88ab\u5927\u91cf\u7684\u5e7f\u64ad\u6570\u636e\u5305\u6240\u5360\u7528\uff0c\u4f7f\u6b63\u5e38\u7684\u70b9\u5bf9\u70b9\u901a\u4fe1\u65e0\u6cd5\u6b63\u5e38\u8fdb\u884c\uff0c\u5176\u5916\u5728\u8868\u73b0\u4e3a\u7f51\u7edc\u901f\u5ea6\u5947\u6162\u65e0\u6bd4\u3002\u51fa\u73b0\u5e7f\u64ad\u98ce\u66b4\u7684\u539f\u56e0\u6709\u5f88\u591a\uff0c\u4e00\u5757\u6545\u969c\u7f51\u5361\u5c31\u53ef\u80fd\u957f\u65f6\u95f4\u5730\u5728\u7f51\u7edc\u4e0a\u53d1\u9001\u5e7f\u64ad\u5305\u800c\u5bfc\u81f4\u5e7f\u64ad\u98ce\u66b4\u3002\u4f7f\u7528\u8def\u7531\u5668\u6216\u4e09\u5c42\u4ea4\u6362\u673a\u80fd\u591f\u5b9e\u73b0\u5728\u4e0d\u540c\u5b50\u7f51\u95f4\u9694\u79bb\u5e7f\u64ad\u98ce\u66b4\u7684\u4f5c\u7528\u3002\u5f53\u8def\u7531\u5668\u6216\u4e09\u5c42\u4ea4\u6362\u673a\u6536\u5230\u5e7f\u64ad\u5e27\u65f6\u5e76\u4e0d\u5904\u7406\u5b83\uff0c\u4f7f\u5b83\u65e0\u6cd5\u518d\u4f20\u9012\u5230\u5176\u4ed6\u5b50\u7f51\u4e2d\uff0c\u4ece\u800c\u8fbe\u5230\u9694\u79bb\u5e7f\u64ad\u98ce\u66b4\u7684\u76ee\u7684\u3002\u56e0\u6b64\u5728\u7531\u51e0\u767e\u53f0\u751a\u81f3\u4e0a\u5343\u53f0\u7535\u8111\u6784\u6210\u7684\u5927\u4e2d\u578b\u5c40\u57df\u7f51\u4e2d\uff0c\u4e3a\u4e86\u9694\u79bb\u5e7f\u64ad\u98ce\u66b4\uff0c\u90fd\u8981\u8fdb\u884c\u5b50\u7f51\u5212\u5206\u3002\u4f7f\u7528vlan\u5b8c\u5168\u53ef\u4ee5\u9694\u79bb\u5e7f\u64ad\u98ce\u66b4\u3002
\u5e7f\u64ad\u98ce\u66b4\u53ea\u5b58\u5728\u4e0e2\u5c42\u7f51\u7edc\u4e2d\u3002\u4e0d\u540cvlan\u4e4b\u95f4\u7684\u901a\u4fe1\u662f\u901a\u8fc73\u5c42\u8def\u7531\u8f6c\u53d1\uff0c\u4e5f\u5c31\u662f\u901a\u8fc7ip\u5730\u5740\u8f6c\u53d1\u4e86\uff0c\u800c\u4e0d\u9760arp\u5e7f\u64ad\u4e86\u3002\u6240\u4ee5\u67d0\u4e00vlan\u7684\u5e7f\u64ad\u5305\u4e0d\u4f1a\u53d1\u9001\u5230\u5176\u4ed6vlan\u3002\u4e5f\u5c31\u5f71\u54cd\u4e0d\u5230\u5176\u4ed6vlan\u3002
楼上兄弟说的打环了应该不是，要是打环，10分钟不要直接死掉。同意是IP地址冲突。看是不是ARP攻击引起的IP地址冲突 。抓包分析下看。看一下log，show log，有可能有打环了或者IP地址冲突。整个VLAN停掉的情况很少。
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