\u4e00\u3001DHCP\u6b3a\u9a97\u6cdb\u6d2a\u653b\u51fb
\uff081\uff09\u9493\u9c7c\u7f51\u7ad9\u7b80\u4ecb\uff1a
\u201c\u9493\u9c7c\u7f51\u7ad9\u201d\u7684\u9875\u9762\u4e0e\u771f\u5b9e\u7f51\u7ad9\u754c\u9762\u57fa\u672c\u4e00\u81f4\uff0c\u6b3a\u9a97\u6d88\u8d39\u8005\u6216\u8005\u7a83\u53d6\u8bbf\u95ee\u8005\u63d0\u4ea4\u7684\u8d26\u53f7\u548c\u5bc6\u7801\u4fe1\u606f\u3002\u9493\u9c7c\u7f51\u7ad9\u4e00\u822c\u53ea\u6709\u4e00\u4e2a\u6216\u51e0\u4e2a\u9875\u9762\uff0c\u548c\u771f\u5b9e\u7f51\u7ad9\u5dee\u522b\u7ec6\u5fae \u3002\u901a\u5e38\u4f2a\u88c5\u6210\u94f6\u884c\u53ca\u7535\u5b50\u5546\u52a1\u3001\u7a83\u53d6\u7528\u6237\u63d0\u4ea4\u7684\u94f6\u884c\u8d26\u53f7\u3001\u5bc6\u7801\u7b49\u79c1\u5bc6\u4fe1\u606f\u7684\u7f51\u7ad9\u3002
\uff082\uff09DHCP\u4e2d\u7ee7\u6280\u672f\u7b80\u4ecb\uff1a
\u4e00\u822c\u60c5\u51b5\u4e0b\uff0cDHCP Server\u548cDCHP Client\u90fd\u5fc5\u987b\u5904\u4e8e\u540c\u4e00\u4e2a\u7f51\u7edc\u4e2d\uff0c\u8fd9\u662f\u56e0\u4e3aDHCP\u7684\u62a5\u6587\u6709\u4e9b\u662f\u4ee5\u5e7f\u64ad\u7684\u5f62\u5f0f\u53d1\u9001\uff0c\u5982\u679c\u4e0d\u4f4d\u4e8e\u540c\u4e00\u4e2a\u7f51\u7edc\uff0c\u5219\u8fd9\u4e9b\u5e7f\u64ad\u7684\u62a5\u6587\u5c31\u65e0\u6cd5\u8de8\u8d8a\u4e09\u5c42\u8def\u7531\u8bbe\u5907\u4f20\u8f93\u3002\u800c\u5728\u6709\u4e9b\u60c5\u51b5\u4e0b\uff0cDHCP\u670d\u52a1\u5fc5\u987b\u8de8\u8d8a\u4e0d\u540c\u7684\u7f51\u7edc\uff0c\u8fd9\u65f6\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u914d\u7f6eDHCP\u4e2d\u7ee7\u670d\u52a1\u3002DHCP\u4e2d\u7ee7\uff0c\u5176\u5b9e\u5c31\u662f\u5728\u4e0eDHCP Server\u4e0d\u540c\u800c\u53c8\u9700\u8981\u7533\u8bf7DHCP\u670d\u52a1\u7684\u7f51\u7edc\u5185\uff0c\u8bbe\u7f6e\u4e00\u4e2a\u4e2d\u7ee7\u5668\uff0c\u4e2d\u7ee7\u5668\u5728\u8be5\u7f51\u7edc\u4e2d\u4ee3\u66ffDHCP Server\u670d\u52a1\u5668\u63a5\u6536DHCP Client\u7684\u8bf7\u6c42\uff0c\u5e76\u5c06DHCP Client\u53d1\u7ed9DHCP Server\u7684DCHP\u62a5\u6587\uff0c\u4ee5\u5355\u64ad\u7684\u5f62\u5f0f\u53d1\u9001\u7ed9DHCP Server\u3002DHCP Server\u5728\u6536\u5230\u7531DHCP\u53d1\u9001\u6765\u7684DHCP \u62a5\u6587\u540e\uff0c\u540c\u6837\u4f1a\u628a\u54cd\u5e94\u7684DHCP\u62a5\u6587\u53d1\u9001\u7ed9DHCP \u4e2d\u7ee7\u3002\u8fd9\u6837\uff0cDHCP\u5176\u5b9e\u662f\u5145\u5f53\u4e86\u4e00\u4e2a\u4e2d\u95f4\u4eba\u7684\u4f5c\u7528\uff0c\u8d77\u5230\u4e86\u5728\u4e0d\u540c\u7684\u7f51\u7edc\u4e2d\u8fd0\u884cDHCP\u7684\u76ee\u7684\u3002
\uff082-1\uff09\u6838\u5fc3\u4ea4\u6362\u673aDHCP\u4e2d\u7ee7\u914d\u7f6e\u547d\u4ee4\uff1a
interface Vlan 20
ip address 192.168.20.254 255.255.255.0
ip helper-address 192.168.10.1\/\/\u5c06\u5e7f\u64ad\u5305\u53d8\u6210\u5355\u64ad\u5355\u64ad\u5305\u53d1\u7ed9DHCP server
exit
\uff083\uff09dhcp\u6b3a\u9a97\u8be6\u89e3\uff1a<\/p>\n\n\n\n
\u6b63\u5e38\u60c5\u51b5\u4e0b\uff1aPC1\u901a\u8fc7DHCP Server\u83b7\u53d6\u5230IP\u3001\u7f51\u5173\u3001DNS\uff0c\u5f53PC1\u8bbf\u95eewww.123.com\u7684\u65f6\u5019\u4f1a\u9996\u5148\u4f1a\u628a\u57df\u540d\u671d\u7740DNS\u53d1\u9001\uff0c\u7136\u540eDNS\u67e5\u8be2\u516c\u7f51IP\u5730\u5740\uff0c\u628a\u516c\u7f51IP\u5730\u5740\u53d1\u7ed9pc1,\u7136\u540epc1\u4f1a\u671d\u7740100.1.1.1\u53d1\u8d77\u9875\u9762\u8bf7\u6c42\uff0c\u6b63\u5e38\u8bbf\u95eeWeb\u670d\u52a1\u5668\u3002 discover\u62a5\u6587\u5230\u8fbe\u6838\u5fc3\u4ea4\u6362\u673a\u4ee5\u540e\uff0c\u7ecf\u8fc7\u6838\u5fc3\u4ea4\u6362\u673a\u7684\u4e2d\u7ee7\u8def\u7531\uff0c\u63d0\u4ea4\u7ed9DHCP Server\u670d\u52a1\u5668\uff0c\u7136\u540e\u670d\u52a1\u5668\u6839\u636e\u8fd9\u4e2a\u7f51\u5173\u5730\u5740\u4ece\u81ea\u5df1\u4f17\u591a\u5730\u5740\u6c60\u91cc\uff0c\u627e\u5230\u5bf9\u5e94\u7f51\u6bb5\u7684\u5730\u5740\u6c60\uff0c\u7ed9pc2\u5206\u914dIP\u5730\u5740\u3002 \u4e8c\u3001\u9632\u5fa1\u2014\u2014DHCP snooping 3550\u914d\u7f6e\uff1a sw-3550(config)#int f0\/2 3\u3001\u53ef\u4ee5\u5728\u63a5\u53e3\u4e0b\u9488\u5bf9DHCP\u62a5\u6587\u8fdb\u884c\u9650\u901f\uff0c\u9632\u5fa1\u9ed1\u5ba2\u5229\u7528DHCP\u62a5\u6587\u8fdb\u884c\u5e7f\u64ad\u6cdb\u6d2a\u653b\u51fb<\/p>\n\n\n\n \u9488\u5bf9DHCP\u62a5\u6587\u8fdb\u884c\u9650\u901f\uff1a\u6bcf\u79d2\u8fd9\u4e2a\u63a5\u53e3\u53ef\u4ee5\u53d1\u9001DHCP\u62a5\u658710\u4e2a 5\u3001\u68c0\u67e5\u662f\u5426\u6709PC\u66ff\u4ee3\u5176\u4ed6PC\u6076\u610f\u9000\u79dfIP\u5730\u5740\uff08pc2\u53d1\u9001\u6076\u610f\u9000\u79df\u6307\u4ee4\u7ed9DHCP server\uff0c\u8ba9server\u56de\u6536pc1 IP\u5730\u5740\uff0c\u6240\u4ee5\u5f53DHCP server\u7ed9\u5176\u4ed6pc\u5206\u914dIP\u5730\u5740\u7684\u65f6\u5019\uff0c\u5206\u914d\u7684\u662fpc1\u7684IP\uff0c\u5219\u4f1a\u5f62\u6210IP\u5730\u5740\u51b2\u7a81\uff0c\u5bfc\u81f4\u4e0d\u80fd\u4e0a\u7f51\uff09\uff0c\u4ee5\u53ca\u68c0\u67e5\u4ece\u8fd9\u4e2a\u63a5\u53e3\u6536\u5230\u7684DHCP\u62a5\u6587\u662f\u5426\u5408\u4e4eDHCP\u7684\u62a5\u6587\u89c4\u77e9<\/p>\n\n\n\n 6\u3001\u914d\u7f6eDHCP snooping\u4e4b\u540e\uff0c\u4ea4\u6362\u673a\u80fd\u591f\u611f\u77e5\u5230DHCP server\u7ed9PC\u5206\u914d\u7684IP\uff0c\u4e8e\u662f\u7cfb\u7edf\u81ea\u52a8\u4e00\u5f20\u6269\u5c55\u7684CAM\uff08mac\uff09\u5730\u5740\u8868\uff08\u6761\u4ef6\u662f\u5fc5\u987b\u6709dhcp server\u548cclient\u53ca\u4ea4\u6362\u673a\u5f00\u542fdhcp snooping\uff0c\u5982\u679c\u6ca1\u6709dhcp server\u53ef\u4ee5\u81ea\u5df1\u5199\uff0c\u4f46\u662f\u4ea4\u6362\u673a\u5fc5\u987b\u5f00\u542fdhcp snooping\uff09\u5c06IP\u5730\u5740\u548c\u4f20\u7edf\u7684mac\u5730\u5740\u8868\u53caIP\u5730\u5740\u79df\u671f\u5173\u8054\u8d77\u6765\u3002\u5f53\u7528\u4ee5\u5176\u4ed6\u7684\u9ad8\u7ea7\u5b89\u5168\u5e94\u7528\uff1b\u8fd9\u4e2aIP\u5206\u914d\u7ed9\u4e86\u90a3\u4e2aMAC\uff0c\u8fd9\u4e2aMAC\u8fde\u63a5\u5728\u6211\u7684\u90a3\u4e2a\u63a5\u53e3\uff0c\u8fd9\u4e2a\u63a5\u53e3\u5c5e\u4e8e\u90a3\u4e2aVLAN\uff0c\u8fd9\u4e2aIP\u5730\u5740\u7684\u79df\u671f\u591a\u5c11\u65f6\u95f4\u3002<\/p>\n\n\n\n \uff08 \u6269\u5c55mac\uff08CAM\uff09\u5730\u5740\u8868\u683c\u5f0f\uff1aIP \u2014 MAC \u2014 \u63a5\u53e3 \u2014 VLAN \u2014 \u79df\u671f\uff09<\/p>\n\n\n\n <\/p>\n\n\n\n \uff082\uff09\u914d\u7f6e\u6848\u5217<\/p>\n\n\n\n 3560\u5168\u5c40\u914d\u7f6e\uff1a 3550\u914d\u7f6e\uff1a \u539f\u56e0\u662f\uff1a\u4e24\u53f0\u4ea4\u6362\u542f\u7528\u4e86DHCP snooping\u529f\u80fd\uff0c\u9ed8\u8ba4\u542f\u7528\u6b64\u529f\u80fd\u7684\u4ea4\u6362\u673a\u6240\u6709\u63a5\u53e3\u4f1a\u62d2\u7edd\u63a5\u53d7\u6765\u81eaDHCP serve\u7684\u62a5\u6587\uff0c\u9700\u8981\u628a\u8fde\u63a5DHCP server\u7684F0\/2\u63a5\u53e3\u7f6e\u4e3atrust\u72b6\u6001\uff0c\u53ef\u4ee5\u63a5\u53d7offea\u548cACK\u62a5\u6587<\/p>\n\n\n\n sw-3550(config)#int f0\/2 PC2\u53d1\u51fadiscover\u62a5\u6587\uff0c\u5728\u7ecf\u8fc73550\u7684\u65f6\u5019\u88ab\u63d2\u5165\u4e86option 82\u9009\u9879\uff0c\u5e26\u6709option82\u9009\u9879\u7684\u62a5\u6587\u4f20\u7ed93560\u7684\u65f6\u5019\u88ab\u62d2\u7edd\u63a5\u53d7<\/p>\n\n\n\n \u89e3\u51b3\u65b9\u6848\uff1a sw-3550(config)#int f0\/6 ip source binding mac\u5730\u5740 VLAN ID IP\u5730\u5740 \u63a5\u53e3 Ip dhcp snooping Int f0\/7 \u9632\u5fa1 IP \u5730\u5740\u6b3a\u9a97\u653b\u51fb \uff0cmac\u5730\u5740\u6b3a\u9a97\u653b\u51fb<\/p>\n\n\n\n ARP\u6b3a\u9a97\u653b\u51fb\uff08\u4e89\u5bf9PC\uff09\u9632\u5fa1\uff1a<\/p>\n\n\n\n ip dhcp snooping vlan 10 \u5224\u65adARP\u5e7f\u64ad\u662f\u5426\u6ee1\u8db3\u6269\u5c55\u7684CAM\u8868\uff0c\u6ee1\u8db3\u901a\u8fc7\uff0c\u4e0d\u6ee1\u8db3\u4e22\u5f03<\/p>\n\n\n\n \u4e00\u3001DHCP\u6b3a\u9a97\u6cdb\u6d2a\u653b\u51fb\uff081\uff09\u9493\u9c7c\u7f51\u7ad9\u7b80\u4ecb\uff1a\u201c\u9493\u9c7c\u7f51\u7ad9\u201d\u7684\u9875\u9762\u4e0e\u771f\u5b9e\u7f51\u7ad9\u754c\u9762\u57fa\u672c\u4e00\u81f4\uff0c\u6b3a\u9a97\u6d88\u8d39\u8005\u6216\u8005\u7a83\u53d6\u8bbf\u95ee\u8005 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1832","post","type-post","status-publish","format-standard","hentry","category-11"],"_links":{"self":[{"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/posts\/1832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1832"}],"version-history":[{"count":4,"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/posts\/1832\/revisions"}],"predecessor-version":[{"id":1846,"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/posts\/1832\/revisions\/1846"}],"wp:attachment":[{"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1832"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.xtaa.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\u9ed1\u5ba2\u6076\u610f\u884c\u4e3a\u76ee\u7684\uff1a\u5f53PC1\u8bbf\u95ee\u5916\u7f51\u6b63\u5e38\u7684\u670d\u52a1\u5668\u65f6\uff0c\u4f7f\u5176\u8bbf\u95ee\u8fd9\u4e2a\u9493\u9c7c\u7f51\u7ad9\u7a83\u53d6\u4ed6\u4eba\u4fe1\u606f\u3002
\u7b2c\u4e00\u6b65<\/strong>\uff1apc2\u4f5c\u4e3a\u6076\u610f\u653b\u51fb\u8005\u4f1a\u8017\u5c3dDHCP Sever\u7684\u5730\u5740\u6c60\uff0c\u8ba9DHCP Server\u4e0d\u80fd\u7ed9pc1\u5206\u914d\u5730\u5740\u6c60
\u9996\u5148\uff0cDHCP Server \u662f\u6839\u636e\u4e0d\u540c\u7684mac\u5730\u5740\u5206\u914dIP\u5730\u5740\uff0c\u57fa\u4e8e\u8fd9\u4e00\u7279\u6027\uff0cpc2\u4f5c\u4e3a\u6076\u610f\u653b\u51fb\u8005\uff0c\u4f1a\u521b\u5efa\u4e00\u4e2adiscover\u62a5\u6587\uff1a<\/p>\n\n\n\n
\u6bcf\u4e2amac\u5206\u914d\u4e00\u4e2aip\uff0c\u7136\u800c\u6838\u5fc3\u4ea4\u6362\u673a\u5173\u5fc3\u7684\u662f\u5904\u4e8ediscover\u62a5\u6587\u91cc\u7684mac\u5730\u5740\u3002\u6240\u4ee5\u6076\u610f\u653b\u51fb\u8005\u53ef\u4ee5\u4f2a\u9020\u5927\u91cf\u7684discover\u62a5\u6587\u5728\u6781\u77ed\u7684\u65f6\u95f4\u5185\u8017\u5c3d\u5730\u5740\u6c60\uff08\u968f\u673a\u4ea7\u751fdiscover\u62a5\u6587\u4e2d\u7684mac\u5730\u5740\uff09
\u7b2c\u4e8c\u6b65<\/strong>\uff1apc2\u5145\u5f53DNS\u548cDHCP \u6b3a\u9a97pc1
\u5f53\u5168\u90e8\u8017\u5c3d\u4ee5\u540e\uff0cpc2\u53ef\u4ee5\u5145\u5f53DHCP\u548cDNS\uff08\u4e00\u822c\u662f\u5728Linux\u7cfb\u7edf\u91cc\u5f00\u542f\uff09
\u6240\u4ee5\u5f53pc1\u518d\u6b21\u53d1\u9001discover\u62a5\u6587\u7684\u8bdd\uff0cpc2\u80af\u5b9a\u53ef\u4ee5\u6536\u5230\uff0c\u6240\u4ee5\u73b0\u5728\u7531pc2\u7ed9pc1\u5206\u914d
IP\uff1a192.168.20.1 \u7f51\u5173\uff1a192.168.20.4 DNS\uff1a192.168.20.4 \uff0c\u6b64\u65f6pc1\u53d1\u9001\u7684\uff0c\u4e0a\u7f51\u6d41\u91cf\u3001DNS\u8bf7\u6c42\u90fd\u53d1\u7ed9\u4e86pc2\uff08pc2\u4f5c\u4e3aDNS\u4f1a\u505a\u4e00\u4e2a\u6620\u5c04\uff1awww.123.com\u5bf9\u5e94\u516c\u7f51IP\u5730\u5740\u4e3a200.1.1.1\uff09
\u6240\u4ee5\u5f53pc1\u8bbf\u95eewww.123.com\u7684\u65f6\u5019\u4f1a\u628a\u57df\u540d\u53d1\u7ed9pc2 \u505a\u4e00\u4e2a\u57df\u540d\u89e3\u6790\uff0c\u800cpc2\u505a\u51fa\u7684\u57df\u540d\u89e3\u6790\u7ed3\u679c\u4e3a200.1.1.1\uff0c200.1.1.1\u5bf9\u5e94\u7684\u662f\u9493\u9c7c\u7f51\u7ad9\uff0c\u6240\u4ee5\u4f60\u5728\u8bbf\u95eewww.123.com\u65f6\uff0c\u5b9e\u9645\u8bbf\u95ee\u7684\u662f\u9493\u9c7c\u7f51\u7ad9\uff08\u4f60\u5728\u9493\u9c7c\u7f51\u7ad9\u4e0a\u8f93\u5165\u7684\u6240\u6709\u7528\u6237\u540d\u3001\u5bc6\u7801\u2026\u2026\u9ed1\u5ba2\u90fd\u53ef\u4ee5\u7a83\u53d6\u5230\uff09
\u6ce8\uff1a\u5f53\u5927\u91cf\u4ea7\u751fBPDU\u62a5\u6587\u65f6\uff0c\u5c31\u9020\u6210\u4e86\u6cdb\u6d2a\u653b\u51fb
<\/p>\n\n\n\n
\uff081\uff09\u5f00\u542fDHCP SNOOPING\u4e4b\u540e\u7684\u6548\u679c\uff1a
3560\u5168\u5c40\u914d\u7f6e\uff1a
3560(config)#ip dhcp snooping \/\/\u5168\u5c40\u5f00\u542f
3560(config)#ipdhcp snooping vlan 100 \/\/VLAN100\u542f\u7528<\/p>\n\n\n\n
3550(config)#ipdhcp snooping \/\/\u5168\u5c40\u5f00\u542f
3550(config)#ipdhcp snooping vlan 100 \/\/VLAN100\u542f\u7528
1\u3001\u4ea4\u6362\u673a\u542f\u7528DHCP snooping \uff0c\u6240\u6709vlan\u63a5\u53e3\u9ed8\u8ba4\u4e3auntrust\u975e\u4fe1\u4efb\u72b6\u6001\uff0c\u65e0\u6cd5\u63a5\u53d7\u6765\u81eaDHCP server\u7684offer\u62a5\u6587\u548cACK\u62a5\u6587\uff0c\u9664\u975e\u628a\u6b64\u63a5\u53e3\u7f6e\u4e3atrust\u4fe1\u4efb\u63a5\u53e3<\/strong><\/p>\n\n\n\n
sw-3550(config-if)#ip dhcp snooping trust
sw-3550(config-if)#exit
2\u3001\u68c0\u67e5\u4e8c\u5c42\u6570\u636e\u5e27\u6e90MAC\u5730\u5740\u548cdiscover\u91cc\u9762\u7684PC MAC\u5730\u5740\u662f\u5426\u5339\u914d\uff0c\u5982\u679c\u4e0d\u5339\u914d\u5219\u4e22\u5f03\uff08\u4f46\u662f\u5982\u679c\u9ed1\u5ba2\u53ef\u4ee5\u8bbe\u8ba1\u7b97\u6cd5\u4f7f\u8fd9\u4e24\u4e2a\u540c\u6b65\u53d8\u5316\uff0c\u5219\u8fd8\u53ef\u4ee5\u5728\u63a5\u53e3\u542f\u7528\u7aef\u53e3\u5b89\u5168\u6280\u672f\uff09\uff08DHCP\u6839\u636ediscover \u91cc\u9762MAC\u5730\u5740\u62a5\u6587\u5206\u914dIP\uff0c\u8017\u5c3d\u5730\u5740\u6c60\u4e3b\u8981\u5c31\u662f\u6839\u636ediscover\u62a5\u6587\u91cc\u9762\u7684MAC\u5730\u5740\uff09<\/p>\n\n\n\n
sw-3550(config)#int f0\/6
sw-3550(config-if)#ipdhcp snooping limit rate 10
sw-3550(config-if)#exit
4\u3001\u68c0\u67e5\u4ecePC\u6536\u5230\u7684DHCP\u62a5\u6587\uff0c\u5982\u679cPC\u53d1\u9001\u7684DHCP\u62a5\u6587\u542b\u6709option 82\uff08\u4e3b\u8981\u4f53\u73b0pc\u8fde\u63a5\u5230\u90a3\u53f0\u4ea4\u6362\u673a\u7684\u54ea\u4e2a\u63a5\u53e3\u4e0b\uff09\u7684\u8bdd\uff08\u8fdd\u89c4\u884c\u4e3a\uff09\u5219\u4e22\u5f03\u6b64\u62a5\u6587\uff0c\u56e0\u4e3a\u53ea\u6709\u4ea4\u6362\u673a\u91c7\u7528\u6743\u9650\u5728DHCP\u62a5\u6587\u91cc\u9762\u63d2\u5165option 82\u9009\u9879\uff08\u4ea4\u6362\u673a\u8fd8\u4f1a\u5728discover\u62a5\u6587\u91cc\u9762\u63d2\u5165\u5bf9\u5e94VLAN\u7684gateway ip\u5730\u5740\uff09<\/p>\n\n\n\n
3560(config)#ip dhcp snooping \/\/\u5168\u5c40\u5f00\u542f
3560(config)#ipdhcp snooping vlan 100 \/\/VLAN100\u542f\u7528<\/p>\n\n\n\n
3550(config)#ipdhcp snooping \/\/\u5168\u5c40\u5f00\u542f
3550(config)#ipdhcp snooping vlan 100 \/\/VLAN100\u542f\u7528
\u89c2\u5bdfPC2\u65e0\u6cd5\u91cd\u65b0\u83b7\u53d6IP\u5730\u5740 \uff1f<\/p>\n\n\n\n
sw-3550(config-if)#ip dhcp snooping trust
sw-3550(config-if)#exit
\u53d1\u73b0\u6253\u4e0atrust\u547d\u4ee4\uff0cPC2\u4efb\u7136\u65e0\u6cd5\u83b7\u53d6IP\u5730\u5740,\u4e3a\u4ec0\u4e48\uff1f<\/p>\n\n\n\n
1\u30013550\u4e0d\u63d2\u5165option 82\u9009\u9879
sw-3550(config)#no ip dhcp snooping information option
2\u30013560\u5141\u8bb8option82\u9009\u9879\u4eceuntruste\u63a5\u53e3\u8fdb\u6765
3560(config)#ip dhcp snooping information option allow-untrusted
\u9488\u5bf9DHCP\u62a5\u6587\u8fdb\u884c\u9650\u901f\uff1a\u6bcf\u79d2\u8fd9\u4e2a\u63a5\u53e3\u53ef\u4ee5\u53d1\u9001DHCP\u62a5\u658710\u4e2a<\/p>\n\n\n\n
sw-3550(config-if)#ipdhcp snooping limit rate 10
sw-3550(config-if)#exit
\u624b\u5de5\u5b9a\u4e49\u6269\u5c55\u7684CAM\u8868\uff08\u4ea4\u6362\u673a\u5f00\u542f\u5fc5\u987bdhcp snooping\uff09\uff1a<\/p>\n\n\n\n
\u57fa\u4e8e\u6e90MAC\u548c\u6e90IP\u5730\u5740\u7684\u8fc7\u6ee4<\/p>\n\n\n\n
Ip dhcp snooping vlan 10
ip source binding 0001.0001.0001 vlan10 192.168.1.101 interface Fa0\/7
\u542f\u7528\u7aef\u53e3\u5b89\u5168\uff1a<\/p>\n\n\n\n
Switchport port-security\uff08\u542f\u7528\u7aef\u53e3\u5b89\u5168\uff09
Ip verity source port-secuity \u2014\u2014\u2014\u2014\u68c0\u67e5\u6e90IP
Exit
\u5bf9\u4eceF0\/7\u63a5\u53e3\u8fdb\u5165\u7684\u62a5\u6587\uff0c\u6839\u636e\u6e90IP\u5730\u5740\u548c\u6e90MAC\u5730\u5740\u8fdb\u884c\u8ba4\u8bc1\u5ba1\u67e5\uff0c\u662f\u5426\u6ee1\u8db3\u6269\u5c55\u7684CAM\u8868<\/p>\n\n\n\n
ip arp inspection vlan 10
ip arp inspection limit 15
\u9ed8\u8ba41\u79d215\u4e2a\u5305\uff0c\u8d85\u8fc7down\uff0c<\/p>\n\n\n\n
\u539f\u6587\u94fe\u63a5\u6709\u56fe\uff1ahttps:\/\/blog.csdn.net\/qq_62311779\/article\/details\/126340075<\/p>\n","protected":false},"excerpt":{"rendered":"