问题描述：
每隔一段时间一个vlan下面的网络就出现异常，前端设备无法正常上网，无法上网期间arp中大量设备的mac都变成dead-deaf-dead，隔10来分钟又恢复正常，查看cpu又占用正常
- 2025-03-18提问
- 举报
-
(0)
最佳答案
%Mar 17 20:27:34:874 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 17 20:27:38:715 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 17 20:27:40:679 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 17 22:12:18:834 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 17 22:12:21:964 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 17 22:12:38:369 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 17 23:57:10:912 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 17 23:57:36:220 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 00:03:33:669 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:51:24:493 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:57:39:117 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:57:40:775 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 01:57:43:794 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 01:57:48:118 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:58:11:673 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:58:15:647 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:58:29:647 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:58:31:658 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:58:39:647 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:58:40:117 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:59:11:655 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:59:33:709 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 01:59:39:648 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 02:00:07:668 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 02:00:20:657 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 02:02:45:057 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 02:04:37:124 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 03:14:52:159 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 03:14:52:757 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 03:14:55:324 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 04:41:58:721 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 05:07:53:241 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 05:07:56:428 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 05:07:56:852 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 07:02:44:738 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 07:02:48:694 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 07:02:51:126 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 07:08:58:297 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 07:09:21:044 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 07:40:31:974 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/47 was notified a topology change. %Mar 18 07:40:33:569 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/47 was notified a topology change. %Mar 18 08:10:50:038 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/47 was notified a topology change. %Mar 18 08:10:51:909 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/47 was notified a topology change. %Mar 18 08:37:58:296 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 08:38:01:322 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/48 was notified a topology change. %Mar 18 08:47:56:210 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 08:48:28:992 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change. %Mar 18 08:51:26:326 2025 CORE_SW STP/6/STP_NOTIFIED_TC: Instance 0"s port GigabitEthernet1/0/45 was notified a topology change.
%Mar 18 10:29:55:235 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.30 70ba-ef91-d3a4 800 GE1/0/47 1072 D in view shell failed to be matched.
%Mar 18 10:29:55:240 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.32 3cc7-8616-49b0 800 GE1/0/47 1058 D in view shell failed to be matched.
%Mar 18 10:29:55:253 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.33 70ba-ef91-df24 800 GE1/0/47 126 D in view shell failed to be matched.
%Mar 18 10:29:55:257 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.35 70ba-ef91-dec4 800 GE1/0/47 46 D in view shell failed to be matched.
%Mar 18 10:29:55:269 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.36 70ba-ef91-dde4 800 GE1/0/47 46 D in view shell failed to be matched.
%Mar 18 10:29:55:273 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.38 70ba-ef91-d724 800 GE1/0/47 46 D in view shell failed to be matched.
%Mar 18 10:29:55:289 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.43 845b-123a-7276 800 GE1/0/47 1195 D in view shell failed to be matched.
%Mar 18 10:29:55:293 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.45 60e6-bc1a-e1da 800 GE1/0/47 976 D in view shell failed to be matched.
%Mar 18 10:29:55:304 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.74.56 2028-3e98-c0c6 800 GE1/0/47 1063 D in view shell failed to be matched.
%Mar 18 10:29:55:308 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.75.254 0c12-62b5-ff80 800 GE1/0/47 1191 D in view shell failed to be matched.
%Mar 18 10:29:55:325 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.97.119 d461-fe33-cb7b 749 GE1/0/45 71 D in view shell failed to be matched.
%Mar 18 10:29:55:329 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.15 484d-7e9a-ba0a 747 GE1/0/45 1170 D in view shell failed to be matched.
%Mar 18 10:29:55:341 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.38 3cef-8c94-f2a7 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:351 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.40 dead-dead-dead 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:354 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.41 dead-dead-dead 747 GE1/0/45 1196 D in view shell failed to be matched.
%Mar 18 10:29:55:364 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.42 dead-dead-dead 747 GE1/0/45 1196 D in view shell failed to be matched.
%Mar 18 10:29:55:368 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.43 dead-dead-dead 747 GE1/0/45 1199 D in view shell failed to be matched.
%Mar 18 10:29:55:381 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.44 dead-dead-dead 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:401 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.45 3cef-8cc4-b1fa 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:406 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.46 dead-dead-dead 747 GE1/0/45 1199 D in view shell failed to be matched.
%Mar 18 10:29:55:412 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.47 3cef-8cde-8c32 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:423 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.52 f8ce-078b-f404 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:435 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.54 4c11-bf58-3438 747 GE1/0/45 1197 D in view shell failed to be matched.
%Mar 18 10:29:55:443 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.57 dead-dead-dead 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:455 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.58 dead-dead-dead 747 GE1/0/45 1199 D in view shell failed to be matched.
%Mar 18 10:29:55:463 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.59 3cef-8c94-f2aa 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:480 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.60 3cef-8cee-54b2 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:484 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.61 dead-dead-dead 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:500 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.62 dead-dead-dead 747 GE1/0/45 1199 D in view shell failed to be matched.
%Mar 18 10:29:55:508 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.63 dead-dead-dead 747 GE1/0/45 1197 D in view shell failed to be matched.
%Mar 18 10:29:55:526 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.64 dead-dead-dead 747 GE1/0/45 1197 D in view shell failed to be matched.
%Mar 18 10:29:55:536 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.65 3cef-8cde-8c3a 747 GE1/0/45 1196 D in view shell failed to be matched.
%Mar 18 10:29:55:544 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.66 3cef-8cde-8c17 747 GE1/0/45 1197 D in view shell failed to be matched.
%Mar 18 10:29:55:558 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.67 3cef-8cde-8b89 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:562 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.68 dead-dead-dead 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:574 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.69 dead-dead-dead 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:595 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.70 3cef-8cde-8c44 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:606 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.71 3cef-8cde-8c2e 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:615 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.72 dead-dead-dead 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:623 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.73 dead-dead-dead 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:630 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.74 dead-dead-dead 747 GE1/0/45 1199 D in view shell failed to be matched.
%Mar 18 10:29:55:643 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.75 3cef-8cc4-361f 747 GE1/0/45 1200 D in view shell failed to be matched.
%Mar 18 10:29:55:667 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.76 dead-dead-dead 747 GE1/0/45 1197 D in view shell failed to be matched.
%Mar 18 10:29:55:676 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.77 3cef-8cc4-3629 747 GE1/0/45 1199 D in view shell failed to be matched.
%Mar 18 10:29:55:703 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.78 e050-8b08-cb92 747 GE1/0/45 1198 D in view shell failed to be matched.
%Mar 18 10:29:55:709 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.79 dead-dead-dead 747 GE1/0/45 1199 D in view shell failed to be matched.
%Mar 18 10:29:55:715 2025 CORE_SW SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=77.91.90.105; Command 77.91.92.80 dead-dead-dead 747 GE1/0/45 1198 D in view shell failed to be matched.这是动荡期间的日志，麻烦各位师傅看下
- 2025-03-18回答
- 评论(1)
- 举报
-
(0)
747就是有问题的网段
看下故障时的设备日志情况 有没有异常日志
ARP表异常与MAC地址失效
- 断网期间ARP表中大量设备MAC变为
dead-deaf-dead，表明设备未响应ARP请求，导致表项老化失效，可能与 ARP欺骗攻击 或 广播风暴 有关。 - 周期性恢复（约10分钟）提示问题与 动态协议刷新 或 临时性配置冲突 相关。
- 断网期间ARP表中大量设备MAC变为
VLAN配置与设备环境
- 存在多个无线路由器开启DHCP服务，且IP地址段与主路由/VLAN网关冲突，导致 IP分配混乱 和 ARP表污染。
- 交换机端口或VLAN划分可能存在 配置错误（如端口隔离、静态ARP绑定错误）。
二、具体排查步骤
检查DHCP与IP冲突
- 关闭冗余DHCP服务：禁用所有非主路由器的DHCP功能，统一由主路由或核心交换机分配IP16。
- 验证终端IP一致性：
- 断网期间检查异常设备的IP地址是否与所属VLAN网段匹配57。
- 使用
arp -a命令确认网关MAC地址是否正确（对比正常状态）14。
排查ARP欺骗与广播风暴
- 启用端口安全与DAI（动态ARP检测）：
- 在交换机上配置
ip arp inspection，限制非法ARP报文47。 - 绑定关键设备的IP-MAC地址（如网关、服务器）47。
- 在交换机上配置
- 抓包分析异常流量：
- 使用Wireshark捕获断网期间VLAN内广播包，检查是否存在高频ARP请求或未知源MAC泛洪17。
- 启用端口安全与DAI（动态ARP检测）：
验证VLAN与交换机配置
- 检查端口VLAN成员关系：
- 确认交换机端口已正确划分到目标VLAN，且未误启用 端口隔离 或 私有VLAN47。
- 验证管理VLAN与业务VLAN的隔离状态（避免管理流量干扰业务）7。
- 检查端口VLAN成员关系：
物理层与设备状态
- 电源与链路稳定性：
- 检查交换机电源指示灯及风扇状态，排除瞬时断电或散热问题28。
- 替换异常VLAN关联端口的网线，测试是否因接触不良导致瞬断8。
- CPU与内存负载：
- 尽管用户反馈CPU占用正常，仍需通过
show processes命令确认是否存在隐藏进程占用资源（如异常广播包处理）27。
- 尽管用户反馈CPU占用正常，仍需通过
- 电源与链路稳定性：
三、解决方案
网络架构优化
- 清理非法DHCP服务器：关闭所有非授权无线路由器的DHCP功能，仅保留核心交换机的DHCP服务16。
- 划分独立管理VLAN：将交换机管理IP与业务VLAN隔离，减少配置冲突风险7。
安全策略加固
- 启用DAI与IP Source Guard：
限制非法ARP报文并验证IP-MAC绑定47。 - 配置静态ARP绑定：在网关交换机上绑定关键设备的IP-MAC地址47。
- 启用DAI与IP Source Guard：
设备调试与监控
- 日志与流量分析：
- 启用交换机的Syslog功能，记录断网时间点的端口状态变化及错误计数27。
- 部署NetFlow或sFlow监控异常VLAN的流量模式7。
- 固件与配置更新：升级交换机固件至最新版本，修复已知VLAN转发漏洞57。
- 日志与流量分析：
四、预期效果
- 阻断ARP欺骗：通过DAI和静态绑定减少MAC地址异常失效现象47。
- 稳定DHCP服务：统一IP分配后，终端IP冲突概率显著降低16。
- 提升网络可靠性：优化VLAN配置及物理链路后，周期性断网问题应消除25。
- 2025-03-18回答
- 评论(0)
- 举报
-
(0)
您好，根据您描述的情况，VLAN下的网络出现异常，前端设备无法正常上网，且ARP表中大量设备的MAC地址变为dead-deaf-dead，这可能是由ARP相关的问题引起的。以下是可能的原因和解决方法：
可能的原因
- ARP缓存问题：设备的ARP缓存中可能有错误的MAC地址信息，导致无法正确解析目标设备的MAC地址。
- 网络攻击或ARP欺骗：网络中可能存在ARP攻击或欺骗行为，导致ARP表项被篡改。
- 网络设备故障：交换机或其他网络设备可能出现故障，导致ARP表项异常。
- IP地址冲突：多个设备使用相同的IP地址，导致ARP解析失败
。 - 链路层问题：物理连接或链路层配置问题可能导致ARP请求无法正常发送或接收。
解决方法
检查ARP表项：
在网络设备上使用命令display arp查看ARP表项，检查是否存在异常的MAC地址
如果发现多个IP地址对应同一个MAC地址，可能表明存在ARP攻击或欺骗
清除ARP缓存：
在设备上清除ARP缓存，让设备重新学习ARP表项。在Windows系统中，可以使用命令arp -d *来清除ARP缓存
检查网络设备日志：
查看交换机或其他网络设备的日志，寻找与ARP异常相关的错误信息
检查网络配置：
确保VLAN配置正确，所有相关接口都正确配置在相应的VLAN中
检查是否存在端口隔离配置，如有必要，取消不必要的端口隔离。
检查物理链路：
使用线缆测试器检查网线是否正常，确保物理连接没有问题。
检查网络攻击：
如果怀疑存在ARP攻击，可以配置防攻击策略，如限制ARP请求的速率
检查IP地址冲突：
使用命令arp -a查看当前网络中的IP地址，检查是否存在IP地址冲突
更新网络设备固件：
确保网络设备的固件和软件都是最新版本，以获得最新的修复和改进
- 2025-03-18回答
- 评论(0)
- 举报
-
(0)
编辑答案
亲~登录后才可以操作哦!
确定你的邮箱还未认证，请认证邮箱或绑定手机后进行当前操作
举报
×
侵犯我的权益
×
侵犯了我企业的权益
×
- 1. 您举报的内容是什么？（请在邮件中列出您举报的内容和链接地址）
- 2. 您是谁？（身份证明材料，可以是身份证或护照等证件）
- 3. 是哪家企业？（营业执照，单位登记证明等证件）
- 4. 您与该企业的关系是？（您是企业法人或被授权人，需提供企业委托授权书）
抄袭了我的内容
×
原文链接或出处
诽谤我
×
- 1. 您举报的内容以及侵犯了您什么权益？（请在邮件中列出您举报的内容、链接地址，并给出简短的说明）
- 2. 您是谁？（身份证明材料，可以是身份证或护照等证件）
对根叔社区有害的内容
×
不规范转载
×
举报说明
747就是有问题的网段