{"id":478,"date":"2025-10-22T09:58:29","date_gmt":"2025-10-22T01:58:29","guid":{"rendered":"https:\/\/www.youvii.site\/?p=478"},"modified":"2025-10-22T09:58:29","modified_gmt":"2025-10-22T01:58:29","slug":"77dhcpsnoopingzhenting","status":"publish","type":"post","link":"https:\/\/www.youvii.site\/index.php\/archives\/77dhcpsnoopingzhenting","title":{"rendered":"7.7DHCPsnooping\uff08\u4fa6\u542c\uff09"},"content":{"rendered":"

7.7 DHCP snooping\uff08\u4fa6\u542c\uff09<\/h1>\n

DHCP\u76d1\u542c\uff08DHCP Snooping\uff09<\/font><\/strong>\u662f\u4e00\u79cdDHCP\u5b89\u5168\u7279\u6027\u3002Cisco\u4ea4\u6362\u673a\u652f\u6301\u5728\u6bcf\u4e2aVLAN\u57fa\u7840\u4e0a\u542f\u7528DHCP\u76d1\u542c\u7279\u6027\u3002\u901a\u8fc7\u8fd9\u79cd\u7279\u6027\uff0c\u4ea4\u6362\u673a\u80fd\u591f\u62e6\u622a\u7b2c\u4e8c\u5c42VLAN\u57df\u5185\u7684\u6240\u6709DHCP\u62a5\u6587\u3002 <\/font><\/p>\n

DHCP\u76d1\u542c\u5c06\u4ea4\u6362\u673a\u7aef\u53e3\u5212\u5206\u4e3a\u4e24\u7c7b\uff1a <\/font><\/p>\n

\u975e\u4fe1\u4efb\u7aef\u53e3\uff1a\u901a\u5e38\u4e3a\u8fde\u63a5\u7ec8\u7aef\u8bbe\u5907\u7684\u7aef\u53e3\uff0c\u5982PC\uff0c\u7f51\u7edc\u6253\u5370\u673a\u7b49 <\/font><\/p>\n

\u4fe1\u4efb\u7aef\u53e3\uff1a\u8fde\u63a5\u5408\u6cd5DHCP\u670d\u52a1\u5668\u7684\u7aef\u53e3\u6216\u8005\u8fde\u63a5\u6c47\u805a\u4ea4\u6362\u673a\u7684\u4e0a\u884c\u7aef\u53e3 <\/font><\/p>\n

\u901a\u8fc7\u5f00\u542fDHCP\u76d1\u542c\u7279\u6027\uff0c\u4ea4\u6362\u673a\u9650\u5236\u7528\u6237\u7aef\u53e3\uff08\u975e\u4fe1\u4efb\u7aef\u53e3\uff09\u53ea\u80fd\u591f\u53d1\u9001DHCP\u8bf7\u6c42\uff0c\u4e22\u5f03\u6765\u81ea\u7528\u6237\u7aef\u53e3\u7684\u6240\u6709\u5176\u5b83DHCP\u62a5\u6587\uff0c\u4f8b\u5982DHCP Offer\u62a5\u6587\u7b49\u3002\u800c\u4e14\uff0c\u5e76\u975e\u6240\u6709\u6765\u81ea\u7528\u6237\u7aef\u53e3\u7684DHCP\u8bf7\u6c42\u90fd\u88ab\u5141\u8bb8\u901a\u8fc7\uff0c\u4ea4\u6362\u673a\u8fd8\u4f1a\u6bd4\u8f83DHCP \u8bf7\u6c42\u62a5\u6587\u7684\uff08\u62a5\u6587\u5934\u91cc\u7684\uff09\u6e90MAC\u5730\u5740\u548c\uff08\u62a5\u6587\u5185\u5bb9\u91cc\u7684\uff09DHCP\u5ba2\u6237\u673a\u7684\u786c\u4ef6\u5730\u5740\uff08\u5373CHADDR\u5b57\u6bb5\uff09\uff0c\u53ea\u6709\u8fd9\u4e24\u8005\u76f8\u540c\u7684\u8bf7\u6c42\u62a5\u6587\u624d\u4f1a\u88ab\u8f6c\u53d1\uff0c\u5426\u5219\u5c06\u88ab\u4e22\u5f03\u3002\u8fd9\u6837\u5c31\u9632\u6b62\u4e86DHCP\u8017\u7aed***\u3002 <\/font><\/p>\n

\u4fe1\u4efb\u7aef\u53e3\u53ef\u4ee5\u63a5\u6536\u6240\u6709\u7684DHCP\u62a5\u6587\u3002\u901a\u8fc7\u53ea\u5c06\u4ea4\u6362\u673a\u8fde\u63a5\u5230\u5408\u6cd5DHCP\u670d\u52a1\u5668\u7684\u7aef\u53e3\u8bbe\u7f6e\u4e3a\u4fe1\u4efb\u7aef\u53e3\uff0c\u5176\u4ed6\u7aef\u53e3\u8bbe\u7f6e\u4e3a\u975e\u4fe1\u4efb\u7aef\u53e3\uff0c\u5c31\u53ef\u4ee5\u9632\u6b62\u7528\u6237\u4f2a\u9020DHCP\u670d\u52a1\u5668\u6765\u653b\u51fb\u7f51\u7edc\u3002DHCP\u76d1\u542c\u7279\u6027\u8fd8\u53ef\u4ee5\u5bf9\u7aef\u53e3\u7684DHCP\u62a5\u6587\u8fdb\u884c\u9650\u901f\u3002\u901a\u8fc7\u5728\u6bcf\u4e2a\u975e\u4fe1\u4efb\u7aef\u53e3\u4e0b\u8fdb\u884c\u9650\u901f\uff0c\u5c06\u53ef\u4ee5\u963b\u6b62\u5408\u6cd5DHCP\u8bf7\u6c42\u62a5\u6587\u7684\u5e7f\u64ad\u3002 <\/font><\/p>\n

DHCP\u76d1\u542c\u8fd8\u6709\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u4f5c\u7528\u5c31\u662f\u5efa\u7acb\u4e00\u5f20DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\uff08DHCP Snooping Binding\uff09\u3002\u4e00\u65e6\u4e00\u4e2a\u8fde\u63a5\u5728\u975e\u4fe1\u4efb\u7aef\u53e3\u7684\u5ba2\u6237\u7aef\u83b7\u5f97\u4e00\u4e2a\u5408\u6cd5\u7684DHCPOffer\uff0c\u4ea4\u6362\u673a\u5c31\u4f1a\u81ea\u52a8\u5728DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u91cc\u6dfb\u52a0\u4e00\u4e2a\u7ed1\u5b9a\u6761\u76ee\uff0c\u5185\u5bb9\u5305\u62ec\u4e86\u8be5\u975e\u4fe1\u4efb\u7aef\u53e3\u7684\u5ba2\u6237\u7aefIP\u5730\u5740\u3001MAC\u5730\u5740\u3001\u7aef\u53e3\u53f7\u3001VLAN\u7f16\u53f7\u3001\u79df\u671f\u7b49\u4fe1\u606f\u3002<\/font><\/p>\n

\u5982\uff1a Switch#show ip dhcp snooping binding<\/font><\/p>\n

MacAddress IpAddress Lease(sec) Type VLAN Int 00:0F:1F:C5:10:08 192.168.10.131 682463 dhcp-snooping 10 FastEthernet0\/1<\/font><\/p>\n

\u8fd9\u5f20DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u4e3a\u8fdb\u4e00\u6b65\u90e8\u7f72IP\u6e90\u9632\u62a4\uff08IPSG\uff09\u548c\u52a8\u6001ARP\u68c0\u6d4b\uff08DAI\uff09\u63d0\u4f9b\u4e86\u4f9d\u636e\u3002<\/font><\/p>\n

\u8bf4\u660e\uff1a I. \u975e\u4fe1\u4efb\u7aef\u53e3\u53ea\u5141\u8bb8\u5ba2\u6237\u7aef\u7684DHCP\u8bf7\u6c42\u62a5\u6587\u901a\u8fc7\uff0c\u8fd9\u91cc\u53ea\u662f\u76f8\u5bf9\u4e8eDHCP\u62a5\u6587\u6765\u8bf4\u7684\u3002\u5176\u4ed6\u975eDHCP\u62a5\u6587\u8fd8\u662f\u53ef\u4ee5\u6b63\u5e38\u8f6c\u53d1\u7684\u3002\u8fd9\u5c31\u8868\u793a\u5ba2\u6237\u7aef\u53ef\u4ee5\u4ee5\u9759\u6001\u6307\u5b9aIP\u5730\u5740\u7684\u65b9\u5f0f\u901a\u8fc7\u975e\u4fe1\u4efb\u7aef\u53e3\u63a5\u5165\u7f51\u7edc\u3002\u7531\u4e8e\u9759\u6001\u5ba2\u6237\u7aef\u4e0d\u4f1a\u53d1\u9001DHCP\u62a5\u6587\uff0c\u6240\u4ee5DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u91cc\u4e5f\u4e0d\u4f1a\u6709\u8be5\u9759\u6001\u5ba2\u6237\u7aef\u7684\u8bb0\u5f55\u3002 \u4fe1\u4efb\u7aef\u53e3\u7684\u5ba2\u6237\u7aef\u4fe1\u606f\u4e0d\u4f1a\u88ab\u8bb0\u5f55\u5230DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u91cc\u3002\u5982\u679c\u6709\u4e00\u5ba2\u6237\u7aef\u8fde\u63a5\u5230\u4e86\u4e00\u4e2a\u4fe1\u4efb\u7aef\u53e3\uff0c\u5373\u4f7f\u5b83\u662f\u901a\u8fc7\u6b63\u5e38\u7684DHCP\u65b9\u5f0f\u83b7\u5f97IP\u5730\u5740\uff0cDHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u91cc\u4e5f\u4e0d\u6709\u8be5\u5ba2\u6237\u7aef\u7684\u8bb0\u5f55\u3002\u5982\u679c\u8981\u6c42\u5ba2\u6237\u7aef\u53ea\u80fd\u4ee5\u52a8\u6001\u83b7\u5f97IP\u7684\u65b9\u5f0f\u63a5\u5165\u7f51\u7edc\uff0c\u5219\u5fc5\u987b\u501f\u52a9\u4e8eIPSG\u548cDAI\u6280\u672f\u3002 <\/font><\/p>\n

II.\u4ea4\u6362\u673a\u4e3a\u4e86\u83b7\u5f97\u9ad8\u901f\u8f6c\u53d1\uff0c\u901a\u5e38\u53ea\u68c0\u67e5\u62a5\u6587\u7684\u4e8c\u5c42\u5e27\u5934\uff0c\u83b7\u5f97\u76ee\u6807MAC\u5730\u5740\u540e\u76f4\u63a5\u8f6c\u53d1\uff0c\u4e0d\u4f1a\u53bb\u68c0\u67e5\u62a5\u6587\u7684\u5185\u5bb9\u3002\u800cDHCP\u76d1\u542c\u672c\u8d28\u4e0a\u5c31\u662f\u5f00\u542f\u4ea4\u6362\u673a\u5bf9DHCP\u62a5\u6587\u7684\u5185\u5bb9\u90e8\u5206\u7684\u68c0\u67e5\uff0cDHCP\u62a5\u6587\u4e0d\u518d\u53ea\u662f\u88ab\u68c0\u67e5\u5e27\u5934\u4e86\u3002 <\/font><\/p>\n

III. DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u4e0d\u4ec5\u7528\u4e8e\u9632\u5fa1DHCP***\uff0c\u8fd8\u4e3a\u540e\u7eed\u7684IPSG\u548cDAI\u6280\u672f\u63d0\u4f9b\u52a8\u6001\u6570\u636e\u5e93\u652f\u6301\u3002<\/font><\/p>\n


\n<\/font><\/p>\n

DHCPsnooping\u914d\u7f6e\uff1a<\/font><\/strong><\/p>\n

Switch(config)#ip dhcp snooping \/\/\u6253\u5f00DHCP Snooping\u529f\u80fd<\/font><\/p>\n

Switch\uff08config\uff09#ip dhcp snooping vlan 10 \/\/\u8bbe\u7f6eDHCP Snooping\u529f\u80fd\u5c06\u4f5c\u7528\u4e8e\u54ea\u4e9bVLAN<\/font><\/p>\n

Switch(config)#ip dhcp snoopiing verify mac-address \/\/\u975e\u4fe1\u4efb\u7aef\u53e3\u6536\u5230\u7684DHCP\u8bf7\u6c42\u62a5\u6587\u7684\u6e90MAC\u548cCHADDR\u5b57\u6bb5\u662f\u5426\u76f8\u540c\uff0c\u4ee5\u9632\u6b62DHCP\u8017\u7aed*\uff0c<\/font><\/strong>\u8be5\u529f\u80fd\u9ed8\u8ba4\u5373\u4e3a\u5f00\u542f<\/font>**\u3002<\/font><\/p>\n

Switch(config-if)#ip dhcp snooping trust<\/font> \/\/\u914d\u7f6e\u63a5\u53e3\u4e3aDHCP\u76d1\u542c\u7279\u6027\u7684\u4fe1\u4efb\u63a5\u53e3\uff0c\u6240\u6709\u63a5\u53e3\u9ed8\u8ba4\u4e3a\u975e\u4fe1\u4efb\u63a5\u53e3<\/font><\/p>\n

Switch(config-if)#ip dhcp snoopiing limit rate 15 \/\/\u9650\u5236\u975e\u4fe1\u4efb\u7aef\u53e3\u7684DHCP\u62a5\u6587\u901f\u7387\u4e3a\u6bcf\u79d215\u4e2a\u5305\uff08\u9ed8\u8ba4\u5373\u4e3a\u6bcf\u79d215\u4e2a\u5305\uff09\u5982\u679c\u4e0d\u914d\u8be5\u8bed\u53e5\uff0c\u5219show ip dhcp snooping\u7684\u7ed3\u679c\u5c06\u4e0d\u5217\u51fa\u6ca1\u6709\u8be5\u8bed\u53e5\u7684\u7aef\u53e3\uff0c\u53ef\u9009\u901f\u7387\u8303\u56f4\u4e3a1-2048<\/font><\/p>\n

\u5efa\u8bae\uff0c\u5728\u914d\u7f6e\u4e86\u7aef\u53e3\u7684DHCP\u62a5\u6587\u9650\u901f\u4e4b\u540e\uff0c\u6700\u597d\u914d\u7f6e\u4ee5\u4e0b\u4e24\u6761\u547d\u4ee4<\/font><\/p>\n

Switch(config)#errdisable recovery cause dhcp-rate-limit \/\/\u4f7f\u7531\u4e8eDHCP\u62a5\u6587\u9650\u901f\u800c\u88ab\u7981\u7528\u7684\u7aef\u53e3\u80fd\u81ea\u52a8\u4eceerr-disable\u72b6\u6001\u540e\uff0c\u7ecf\u8fc730\u79d2\u65f6\u95f4\u624d\u80fd\u6062\u590d<\/font><\/p>\n

Switch(config)#ip dhcp snooping information option \/\/\u8bbe\u7f6e\u4ea4\u6362\u673a\u662f\u5426\u4e3a\u975e\u4fe1\u4efb\u7aef\u53e3\u6536\u5230\u7684DHCP\u62a5\u6587\u63d2\u5165Option 82\uff0c\u9ed8\u8ba4\u5373\u4e3a\u5f00\u542f\u72b6\u6001<\/font><\/p>\n

Swtich(config)#ip dhcp snooping information option allow-untrusted \/\/\u8bbe\u7f6e\u6c47\u805a\u4ea4\u6362\u673a\u5c06\u63a5\u6536\u4ece\u975e\u4fe1\u4efb\u7aef\u53e3\u6536\u5230\u7684\u63a5\u5165\u4ea4\u6362\u673a\u53d1\u6765\u7684\u5e26\u6709\u9009\u987982\u7684DHCP\u62a5\u6587<\/font><\/p>\n

Switch#ip dhcp snooping binding 000f.1fc5.1008 vlan 10 192.168.10.131 interface fa0\/2 expiry 692000 \/\/\u7279\u6743\u6a21\u5f0f\u547d\u4ee4\uff1a\u624b\u5de5\u6dfb\u52a0\u4e00\u6761DHCP\u76d1\u542c\u7ed1\u5b9a\u6761\u76ee\uff1bexpiry\u4e3a\u65f6\u95f4\u503c\uff0c\u5373\u4e3a\u76d1\u542c\u7ed1\u5b9a\u4e2d\u7684lease\uff08\u79df\u671f\uff09<\/font><\/p>\n

Switch(config)#ip dhcp snooping database flash:dhcp_snooping.db \/\/\u5c06DHCP\u76d1\u542c\u8868\u4fdd\u5b58\u5728flash\u4e2d\uff0c\u6587\u4ef6\u540d\u4e3adhcp_snooping.db<\/font><\/p>\n

Swtich(config)#ip dhcp snooping database tftp:\/\/192.168.2.5\/Switch\/dhcp_snooping.db \/\/\u5c06DHCP\u4e8b\u5148\u786e\u5b9a\u53ef\u8fbe\u3002URL\u4e2d\u7684Switch\u662ftftp\u670d\u52a1\u5668\u4e0b\u4e00\u4e2a\u6587\u4ef6\u5939\uff1b\u4fdd\u5b58\u540e\u7684\u6587\u4ef6\u540d\u4e3adhcp_snooping.db\uff0c\u5f53\u66f4\u6539\u4fdd\u5b58\u4f4d\u7f6e\u540e\u4f1a\u7acb\u5373\u6267\u884c\u201c\u5199\u201d\u64cd\u4f5c\u3002<\/font><\/p>\n

Swtich(config)#ip dhcp snooping database write-delay 30 \/\/\u6307DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u53d1\u751f\u66f4\u65b0\u540e\uff0c\u7b49\u5f8530\u79d2\uff0c\u518d\u5199\u5165\u6587\u4ef6\uff0c\u9ed8\u8ba4\u4e3a300\u79d2\uff1b\u53ef\u9009\u8303\u56f4\u4e3a15-86400\u79d2<\/font><\/p>\n

Switch(config)#ip dhcp snooping database timeout 60 \/\/\u6307DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u5c1d\u8bd5\u5199\u5165\u64cd\u4f5c\u5931\u8d25\u540e\uff0c\u91cd\u65b0\u5c1d\u8bd5\u5199\u5165\u64cd\u4f5c\uff0c\u76f4\u523060\u79d2\u540e\u505c\u6b62\u5c1d\u8bd5\u3002\u9ed8\u8ba4\u4e3a300\u79d2\uff1b\u53ef\u9009\u8303\u56f4\u4e3a0-86400\u79d2<\/font><\/p>\n

\u8bf4\u660e\uff1a\u5b9e\u9645\u4e0a\u5f53DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\u53d1\u751f\u6539\u53d8\u65f6\u4f1a\u5148\u7b49\u5f85write-delay\u7684\u65f6\u95f4\uff0c\u7136\u540e\u6267\u884c\u5199\u5165\u64cd\u4f5c\uff0c\u5982\u679c\u5199\u5165\u64cd\u4f5c\u5931\u8d25\uff08\u6bd4\u5982tftp\u670d\u52a1\u5668\u4e0d\u53ef\u8fbe\uff09\uff0c\u63a5\u7740\u5c31\u7b49\u5f85timeout\u7684\u65f6\u95f4\uff0c\u5728\u6b64\u65f6\u95f4\u6bb5\u5185\u4e0d\u65ad\u91cd\u8bd5\u3002\u5728timeout\u65f6\u95f4\u8fc7\u540e\uff0c\u505c\u6b62\u5199\u5165\u5c1d\u8bd5\u3002\u4f46\u7531\u4e8e\u76d1\u542c\u7ed1\u5b9a\u8868\u5df2\u7ecf\u53d1\u751f\u4e86\u6539\u53d8\uff0c\u56e0\u6b64\u91cd\u65b0\u5f00\u59cb\u7b49\u5f85write-delay\u65f6\u95f4\u6267\u884c\u5199\u5165\u64cd\u4f5c\uff0c\u4e0d\u65ad\u5faa\u73af\uff0c\u76f4\u5230\u5199\u5165\u64cd\u4f5c\u6210\u529f\u3002<\/font><\/p>\n

Switch#renew ip dhcp snooping database flash:dhcp_snooping.db \/\/\u7279\u6743\u7ea7\u547d\u4ee4\uff1a\u7acb\u5373\u4fdd\u5b58\u597d\u7684\u6570\u636e\u5e93\u6587\u4ef6\u4e2d\u8bfb\u53d6DHCP\u76d1\u542c\u8868\u3002<\/font><\/p>\n


\n<\/font><\/p>\n

\u663e\u793aDHCP Snooping\u7684\u72b6\u6001<\/font><\/strong><\/p>\n

Switch#show ip dhcp snooping \/\/\u663e\u793a\u5f53\u524dDHCP\u76d1\u542c\u7684\u5404\u9009\u9879\u548c\u5404\u7aef\u53e3\u7684\u914d\u7f6e\u60c5\u51b5<\/font><\/p>\n

Switch#show ip dhcp snooping binding \/\/\u663e\u793a\u5f53\u524d\u7684DHCP\u76d1\u542c\u7ed1\u5b9a\u8868<\/font><\/p>\n

Switch#show ip dhcp snooping database \/\/\u663e\u793aDHCP\u76d1\u542c\u7ed1\u5b9a\u6570\u636e\u5e93\u7684\u76f8\u5173\u4fe1\u606f<\/font><\/p>\n

Switch#show ip dhcp snooping statistics \/\/\u663e\u793aDHCP\u76d1\u542c\u7684\u5de5\u4f5c\u7edf\u8ba1<\/font><\/p>\n

Switch#clear ip dhcp snooping binding \/\/\u6e05\u9664DHCP\u76d1\u542c\u7ed1\u5b9a\u8868\uff1b\u6ce8\u610f\uff1a\u672c\u547d\u4ee4\u65e0\u6cd5\u5bf9\u5355\u4e00\u6761\u76ee\u8fdb\u884c\u6e05\u695a\uff0c\u53ea\u80fd\u6e05\u695a\u6240\u6709\u6761\u76ee<\/font><\/p>\n

Switch#clear ip dhcp snooping database statistics \/\/\u6e05\u7a7aDHCP\u76d1\u542c\u7ed1\u5b9a\u6570\u636e\u5e93\u7684\u8ba1\u6570\u5668<\/font><\/p>\n

Switch#clear ip dhcp snooping statistics \/\/\u6e05\u7a7aDHCP\u76d1\u542c\u7684\u5de5\u4f5c\u7edf\u8ba1\u8ba1\u6570\u5668<\/font><\/p>\n

\u9879\u76ee\u62d3\u6251\uff1a<\/p>\n

\"1741671662956-643e2b48-c79c-4681-87fd-747abb966234.png\"<\/p>\n

\u9879\u76ee\u9700\u6c42\uff1a<\/p>\n

\u8fd1\u671f\u516c\u53f8\u5185\u53d1\u73b0DHCP\u975e\u5e38\u4e0d\u7a33\u5b9a\uff0c\u5ba2\u6237\u673a\u7ecf\u5e38\u83b7\u53d6\u5230\u6765\u81ea\u5176\u4ed6DHCP\u670d\u52a1\u5668\u5206\u914d\u7684\u5730\u5740\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u73b0\u5728\u9700\u8981\u5bf9\u516c\u53f8\u6240\u6709\u4ea4\u6362\u673a\u8fd0\u884csnooping\u914d\u7f6e\uff0c\u9694\u79bb\u975e\u6cd5\u7684DHCP\u5e7f\u64ad\u56de\u5e94\u3002<\/p>\n

\u9879\u76ee\u5b9e\u65bd\uff1a<\/p>\n

\u6838\u5fc3\u8bed\u53e5\uff1a<\/p>\n

1\u3001\u5206\u522b\u4e3aDHCP1\u548cDHCP2\u505a\u597d\u5730\u5740\u6c60\u914d\u7f6e\uff0cDHCP1\u7684IP\u4e3a192.168.1.1\/24\uff0cDHCP2\u7684IP\u4e3a192.168.2.1\/24\uff0c\u5176\u4e2dDHCP2\u4e3a\u4eff\u5192\u7684\u6363\u4e71\u8005\u3002<\/p>\n

2.\u5206\u522b\u5728\u4e09\u53f0\u4ea4\u6362\u673a\u4e0a\u8bbe\u7f6edhcpsnooping\uff0c\u89e3\u51b3DHCP\u6df7\u4e71\u95ee\u9898\u3002<\/p>\n

\u914d\u7f6e\uff1a<\/p>\n

Sw1\uff1a<\/p>\n

en <\/p>\n

conf t<\/p>\n

hostname S1<\/p>\n

ip dhcp snooping<\/p>\n

int f0\/3<\/p>\n

ip dhcp snooping trust<\/p>\n

\u6216<\/p>\n

Sw1\uff1a<\/p>\n

en<\/p>\n

conf t<\/p>\n

vl 10<\/p>\n

exi<\/p>\n

ip dhcp snooping vl 10<\/p>\n

int f0\/3 <\/p>\n

sw mo ac<\/p>\n

sw ac vl 10<\/p>\n

int range f0\/1-2<\/p>\n

sw mo tr<\/p>\n

Sw2:<\/p>\n

en<\/p>\n

conf t<\/p>\n

hostname S2<\/p>\n

vl 10<\/p>\n

exi<\/p>\n

int f0\/3<\/p>\n

sw mo tr<\/p>\n

int f0\/1 <\/p>\n

sw mo ac<\/p>\n

sw ac vl 10<\/p>\n

Sw3:<\/p>\n

en<\/p>\n

conf t<\/p>\n

hostname S3<\/p>\n

vl 10<\/p>\n

exi<\/p>\n

int f0\/1<\/p>\n

sw mo tr<\/p>\n

int f0\/2<\/p>\n

sw mo ac<\/p>\n

sw ac vl 10<\/p>\n

\u5b9e\u9a8c\u622a\u56fe\uff1a<\/p>\n

\"1741671662966-4ca72530-2007-4416-bb5b-2833b6bb2b6e.png\"<\/p>\n

\n

\u66f4\u65b0: 2025-03-11 13:41:07
\n\u539f\u6587: https:\/\/www.yuque.com\/yuhui.net\/network\/tie1bbxru8qt0g42<\/a><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"

7.7 DHCP snooping\uff08\u4fa6\u542c\uff09 DHCP\u76d1\u542c\uff08DHCP Snooping\uff09\u662f\u4e00\u79cdDHCP\u5b89\u5168\u7279\u6027\u3002Cisco\u4ea4\u6362\u673a\u652f\u6301\u5728\u6bcf\u4e2aVLAN\u57fa\u7840\u4e0a\u542f\u7528DHCP\u76d1\u542c\u7279\u6027\u3002\u901a\u8fc7\u8fd9\u79cd\u7279\u6027\uff0c\u4ea4\u6362\u673a\u80fd\u591f\u62e6\u622a\u7b2c\u4e8c\u5c42VLAN\u57df\u5185\u7684\u6240\u6709DHCP\u62a5\u6587\u3002 DHCP\u76d1\u542c\u5c06\u4ea4\u6362\u673a\u7aef\u53e3\u5212\u5206\u4e3a\u4e24\u7c7b\uff1a \u975e\u4fe1\u4efb\u7aef\u53e3\uff1a\u901a\u5e38\u4e3a\u8fde\u63a5\u7ec8\u7aef\u8bbe\u5907\u7684\u7aef\u53e3\uff0c\u5982PC\uff0c\u7f51\u7edc\u6253\u5370\u673a\u7b49 \u4fe1\u4efb\u7aef\u53e3\uff1a\u8fde\u63a5\u5408\u6cd5DHCP\u670d\u52a1\u5668\u7684\u7aef\u53e3\u6216\u8005\u8fde\u63a5\u6c47\u805a\u4ea4\u6362\u673a\u7684\u4e0a\u884c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61,3],"tags":[79,85],"class_list":["post-478","post","type-post","status-publish","format-standard","hentry","category-ciscoluyouyujiaohuan","category-interface","tag-shiyan","tag-cisco"],"_links":{"self":[{"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/posts\/478","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/comments?post=478"}],"version-history":[{"count":0,"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/posts\/478\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/media?parent=478"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/categories?post=478"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.youvii.site\/index.php\/wp-json\/wp\/v2\/tags?post=478"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}