交换机做了VLAN 怎么用一个DHCP服务器 同一网段划分vlan后，做dhcp，实现每个vlan自动获取...

\u4ea4\u6362\u673a\u4e2dDHCP\u670d\u52a1\u5668\u91cc\u7684VLAN\u8bbe\u7f6e\u662f\u5e72\u4ec0\u4e48\u7528\u7684

\u5efa\u8bae\u4f60\u767e\u5ea6\u4e0bvlan\u3002\u8fd9\u91cc\u6211\u7b80\u5355\u7684\u8bf4\uff0c\u65b9\u4fbf\u4f60\u7406\u89e3\u3002\u4f60\u53ef\u4ee5\u770b\u505a\u662f\u5206\u7ec4\u529f\u80fd\uff0c\u4e0d\u540cvlan\u6570\u636e\u4e0d\u4f1a\u4e92\u901a\u3002
\u4e0d\u61c2\u7ee7\u7eed\u95ee\uff0c\u6ee1\u610f\u8bf7\u91c7\u7eb3

\u8d5e\u6210\u697c\u4e0a\u7684\uff0c\u53ea\u662f\u5c11\u4e86\u914d\u7f6e\u547d\u4ee4\uff0c\u8865\u5145\u5982\u4e0b\uff1a
\u4ea4\u6362\u673a\u914d\u7f6eDHCP\u914d\u7f6e
1\uff0c\u4ea4\u6362\u673a\u4f5cDHCP Server
\u300e\u914d\u7f6e\u73af\u5883\u53c2\u6570\u300f
1. PC1\u3001PC2\u7684\u7f51\u5361\u5747\u91c7\u7528\u52a8\u6001\u83b7\u53d6IP\u5730\u5740\u7684\u65b9\u5f0f
2. PC1\u8fde\u63a5\u5230\u4ea4\u6362\u673a\u7684\u4ee5\u592a\u7f51\u7aef\u53e30/1\uff0c\u5c5e\u4e8eVLAN10\uff1bPC2\u8fde\u63a5\u5230\u4ea4\u6362\u673a\u7684\u4ee5\u592a\u7f51\u7aef\u53e30/2\uff0c\u5c5e\u4e8eVLAN20
3. \u4e09\u5c42\u4ea4\u6362\u673aSwitchA\u7684VLAN\u63a5\u53e310\u5730\u5740\u4e3a10.1.1.1/24\uff0cVLAN\u63a5\u53e320\u5730\u5740\u4e3a10.1.2.1/24
\u300e\u7ec4\u7f51\u9700\u6c42\u300f
1. PC1\u53ef\u4ee5\u52a8\u6001\u83b7\u53d610.1.1.0/24\u7f51\u6bb5\u5730\u5740\uff0c\u5e76\u4e14\u7f51\u5173\u5730\u5740\u4e3a10.1.1.1\uff1bPC2\u53ef\u4ee5\u52a8\u6001\u83b7\u53d610.1.2.0/24\u7f51\u6bb5\u5730\u5740\uff0c\u5e76\u4e14\u7f51\u5173\u5730\u5740\u4e3a10.1.2.1
\u300eDHCP Server\u914d\u7f6e\u6d41\u7a0b\u6d41\u7a0b\u300f
\u53ef\u4ee5\u5b8c\u6210\u5bf9\u76f4\u63a5\u8fde\u63a5\u5230\u4e09\u5c42\u4ea4\u6362\u673a\u7684PC\u673a\u5206\u914dIP\u5730\u5740\uff0c\u4e5f\u53ef\u4ee5\u5bf9\u901a\u8fc7DHCP\u4e2d\u7ee7\u8bbe\u5907\u8fde\u63a5\u5230\u4e09\u5c42\u4ea4\u6362\u673a\u7684PC\u673a\u5206\u914dIP\u5730\u5740\u3002
\u5206\u914d\u5730\u5740\u7684\u65b9\u5f0f\u53ef\u4ee5\u91c7\u7528\u63a5\u53e3\u65b9\u5f0f\uff0c\u6216\u8005\u5168\u5c40\u5730\u5740\u6c60\u65b9\u5f0f\u3002
\u3010SwitchA\u91c7\u7528\u63a5\u53e3\u65b9\u5f0f\u5206\u914d\u5730\u5740\u76f8\u5173\u914d\u7f6e\u3011
1. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN10
[SwitchA]vlan 10
2. \u5c06E0/1\u52a0\u5165\u5230VLAN10
[SwitchA-vlan10]port Ethernet 0/1
3. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN\u63a5\u53e310
[SwitchA]interface Vlan-interface 10
4. \u4e3aVLAN\u63a5\u53e310\u914d\u7f6eIP\u5730\u5740
[SwitchA-Vlan-interface10]ip address 10.1.1.1 255.255.255.0
5. \u5728VLAN\u63a5\u53e310\u4e0a\u9009\u62e9\u63a5\u53e3\u65b9\u5f0f\u5206\u914dIP\u5730\u5740
[SwitchA-Vlan-interface10]dhcp select interface
6. \u7981\u6b62\u5c06PC\u673a\u7684\u7f51\u5173\u5730\u5740\u5206\u914d\u7ed9\u7528\u6237
[SwitchA]dhcp server forbidden-ip 10.1.1.1
\u3010SwitchA\u91c7\u7528\u5168\u5c40\u5730\u5740\u6c60\u65b9\u5f0f\u5206\u914d\u5730\u5740\u76f8\u5173\u914d\u7f6e\u3011
1. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN10
[SwitchA]vlan 10
2. \u5c06E0/1\u52a0\u5165\u5230VLAN10
[SwitchA-vlan10]port Ethernet 0/1
3. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN\u63a5\u53e310
[SwitchA]interface Vlan-interface 10
4. \u4e3aVLAN\u63a5\u53e310\u914d\u7f6eIP\u5730\u5740
[SwitchA-Vlan-interface10]ip address 10.1.1.1 255.255.255.0
5. \u5728VLAN\u63a5\u53e310\u4e0a\u9009\u62e9\u5168\u5c40\u5730\u5740\u6c60\u65b9\u5f0f\u5206\u914dIP\u5730\u5740
[SwitchA-Vlan-interface10]dhcp select global
6. \u521b\u5efa\u5168\u5c40\u5730\u5740\u6c60\uff0c\u5e76\u547d\u540d\u4e3a\u201dvlan10\u201d
[SwitchA]dhcp server ip-pool vlan10
7. \u914d\u7f6evlan10\u5730\u5740\u6c60\u7ed9\u7528\u6237\u5206\u914d\u7684\u5730\u5740\u8303\u56f4\u4ee5\u53ca\u7528\u6237\u7684\u7f51\u5173\u5730\u5740
[SwitchA-dhcp-vlan10]network 10.1.1.0 mask 255.255.255.0
[SwitchA-dhcp-vlan10]gateway-list 10.1.1.1
8. \u7981\u6b62\u5c06PC\u673a\u7684\u7f51\u5173\u5730\u5740\u5206\u914d\u7ed9\u7528\u6237
[SwitchA]dhcp server forbidden-ip 10.1.1.1
\u3010\u8865\u5145\u8bf4\u660e\u3011
\u4ee5\u4e0a\u914d\u7f6e\u4ee5VLAN10\u7684\u4e3a\u4f8b\uff0cVLAN20\u7684\u914d\u7f6e\u53c2\u7167VLAN10\u7684\u914d\u7f6e\u5373\u53ef\u3002\u5728\u91c7\u7528\u5168\u5c40\u5730\u5740\u6c60\u65b9\u5f0f\u65f6\uff0c\u9700\u65b0\u5efa\u4e00\u4e2a\u4e0e\u201dvlan10\u201d\u4e0d\u540c\u540d\u7684\u5168\u5c40\u5730\u5740\u6c60\u3002
\u7ecf\u8fc7\u4ee5\u4e0a\u914d\u7f6e\uff0c\u53ef\u4ee5\u5b8c\u6210\u4e3aPC1\u5206\u914d\u7684IP\u5730\u5740\u4e3a10.1.1.0/24\uff0c\u540c\u65f6PC1\u7684\u7f51\u5173\u5730\u5740\u4e3a10.1.1.1\uff1b\u4e3aPC2\u5206\u914d\u7684IP\u5730\u5740\u4e3a10.1.2.0/24\uff0c\u540c\u65f6PC2\u7684\u7f51\u5173\u5730\u5740\u4e3a10.1.2.1\u3002
VLAN\u63a5\u53e3\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4ee5\u5168\u5c40\u5730\u5740\u6c60\u65b9\u5f0f\u8fdb\u884c\u5730\u5740\u5206\u914d\uff0c\u56e0\u6b64\u5f53VLAN\u63a5\u53e3\u914d\u7f6e\u4e86\u4ee5\u5168\u5c40\u5730\u5740\u6c60\u65b9\u5f0f\u8fdb\u884c\u5730\u5740\u5206\u914d\u540e\uff0c\u67e5\u770b\u4ea4\u6362\u673a\u5f53\u524d\u914d\u7f6e\u65f6\uff0c\u5728\u76f8\u5e94\u7684VLAN\u63a5\u53e3\u4e0b\u65e0\u6cd5\u770b\u5230\u6709\u5173DHCP\u7684\u914d\u7f6e\u3002
\u5229\u7528\u5168\u5c40\u5730\u5740\u6c60\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5b8c\u6210\u4e3a\u7528\u6237\u5206\u914d\u4e0e\u4e09\u5c42\u4ea4\u6362\u673a\u672c\u8eabVLAN\u63a5\u53e3\u5730\u5740\u4e0d\u540c\u7f51\u6bb5\u7684IP\u5730\u5740\u3002
2\uff0cDHCP Relay\u914d\u7f6e
\u300e\u914d\u7f6e\u73af\u5883\u53c2\u6570\u300f
1. DHCP Server\u7684IP\u5730\u5740\u4e3a192.168.0.10/24
2. DHCP Server\u8fde\u63a5\u5728\u4ea4\u6362\u673a\u7684G1/1\u7aef\u53e3\uff0c\u5c5e\u4e8evlan100\uff0c\u7f51\u5173\u5373\u4ea4\u6362\u673avlan\u63a5\u53e3100\u7684\u5730\u5740192.168.0.1/24
3. E0/1-E0/10\u5c5e\u4e8evlan10\uff0c\u7f51\u6bb5\u5730\u574010.10.1.1/24
4. E0/11-E0/20\u5c5e\u4e8evlan20\uff0c\u7f51\u6bb5\u5730\u574010.10.2.1/24
\u300e\u7ec4\u7f51\u9700\u6c42\u300f
1. \u5728SwitchA\u4e0a\u914d\u7f6eDHCP Relay\u4f7f\u4e0b\u9762\u7528\u6237\u52a8\u6001\u83b7\u53d6\u6307\u5b9a\u7684\u76f8\u5e94\u7f51\u6bb5\u7684IP\u5730\u5740
2. PC1\u3001PC2\u5747\u53ef\u4ee5ping\u901a\u81ea\u5df1\u7684\u7f51\u5173\uff0c\u540c\u65f6PC1\u3001PC2\u4e4b\u95f4\u53ef\u4ee5\u4e92\u8bbf
\u300e\u4ea4\u6362\u673aDHCP Relay\u914d\u7f6e\u6d41\u7a0b\u300f
DHCP Relay\u7684\u4f5c\u7528\u5219\u662f\u4e3a\u4e86\u9002\u5e94\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e0d\u5728\u540c\u4e00\u7f51\u6bb5\u7684\u60c5\u51b5\uff0c\u901a\u8fc7Relay\uff0c\u4e0d\u540c\u5b50\u7f51\u7684\u7528\u6237\u53ef\u4ee5\u5230\u540c\u4e00\u4e2aDHCP Server\u7533\u8bf7IP\u5730\u5740\uff0c\u8fd9\u6837\u4fbf\u4e8e\u5730\u5740\u6c60\u7684\u7ba1\u7406\u548c\u7ef4\u62a4\u3002
\u3010SwitchA\u76f8\u5173\u914d\u7f6e\u3011
1. \u5168\u5c40\u4f7f\u80fdDHCP\u529f\u80fd\uff08\u7f3a\u7701\u60c5\u51b5\u4e0b\uff0cDHCP\u529f\u80fd\u5904\u4e8e\u4f7f\u80fd\u72b6\u6001\uff09
[SwitchA]dhcp enable
2. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN100
[SwitchA]vlan 100
3. \u5c06G1/1\u52a0\u5165\u5230VLAN100
[SwitchA-vlan100]port GigabitEthernet 1/1
4. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN\u63a5\u53e3100
[SwitchA]interface Vlan-interface 100
5. \u4e3aVLAN\u63a5\u53e3100\u914d\u7f6eIP\u5730\u5740
[SwitchA-Vlan-interface100]ip address 192.168.0.1 255.255.255.0
6. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN10
[SwitchA]vlan 10
7. \u5c06E0/1-E0/10\u52a0\u5165\u5230VLAN10
[SwitchA-vlan10]port Ethernet 0/1 to Ethernet 0/10
8. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN\u63a5\u53e310
[SwitchA]interface Vlan-interface 10
9. \u4e3aVLAN\u63a5\u53e310\u914d\u7f6eIP\u5730\u5740
[SwitchA-Vlan-interface10]ip address 10.10.1.1 255.255.255.0
10. \u4f7f\u80fdVLAN\u63a5\u53e310\u7684DHCP\u4e2d\u7ee7\u529f\u80fd
[SwitchA-Vlan-interface10]dhcp select relay
11. \u4e3aVLAN\u63a5\u53e310\u914d\u7f6eDHCP\u670d\u52a1\u5668\u7684\u5730\u5740
[SwitchA-Vlan-interface10]ip relay address 192.168.0.10
12. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN20
[SwitchA-vlan10]vlan 20
13. \u5c06E0/11-E0/20\u52a0\u5165\u5230VLAN20
[SwitchA-vlan20]port Ethernet 0/11 to Ethernet 0/20
14. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN\u63a5\u53e320
[SwitchA]interface Vlan-interface 20
15. \u4e3aVLAN\u63a5\u53e320\u914d\u7f6eIP\u5730\u5740
[SwitchA-Vlan-interface20]ip address 10.10.2.1 255.255.255.0
16. \u4f7f\u80fdVLAN\u63a5\u53e320\u7684DHCP\u4e2d\u7ee7\u529f\u80fd
[SwitchA-Vlan-interface20]dhcp select relay
17. \u4e3aVLAN\u63a5\u53e320\u914d\u7f6eDHCP\u670d\u52a1\u5668\u7684\u5730\u5740
[SwitchA-Vlan-interface20]ip relay address 192.168.0.10
\u3010\u8865\u5145\u8bf4\u660e\u3011
\u4e5f\u53ef\u4ee5\u5728\u5168\u5c40\u914d\u7f6e\u6a21\u5f0f\u4e0b\uff0c\u4f7f\u80fd\u67d0\u4e2a\u6216\u67d0\u4e9bVLAN\u63a5\u53e3\u4e0a\u7684DHCP\u4e2d\u7ee7\u529f\u80fd\uff0c\u4f8b\u5982\uff1a[SwitchA]dhcp select relay interface Vlan-interface 10
3\uff0cDHCP Snooping
\u300e\u914d\u7f6e\u73af\u5883\u53c2\u6570\u300f
1. DHCP Server\u8fde\u63a5\u5728\u4ea4\u6362\u673aSwitchA\u7684G1/1\u7aef\u53e3\uff0c\u5c5e\u4e8evlan10\uff0cIP\u5730\u5740\u4e3a10.10.1.253/24
2. \u7aef\u53e3E0/1\u548cE0/2\u540c\u5c5e\u4e8evlan10
\u300e\u7ec4\u7f51\u9700\u6c42\u300f
1. PC1\u3001PC2\u5747\u53ef\u4ee5\u4ece\u6307\u5b9aDHCP Server\u83b7\u53d6\u5230IP\u5730\u5740
2. \u9632\u6b62\u5176\u4ed6\u975e\u6cd5\u7684DHCP Server\u5f71\u54cd\u7f51\u7edc\u4e2d\u7684\u4e3b\u673a
\u300e\u4ea4\u6362\u673aDHCP-Snooping\u914d\u7f6e\u6d41\u7a0b\u300f
\u5f53\u4ea4\u6362\u673a\u5f00\u542f\u4e86DHCP-Snooping\u540e\uff0c\u4f1a\u5bf9DHCP\u62a5\u6587\u8fdb\u884c\u4fa6\u542c\uff0c\u5e76\u53ef\u4ee5\u4ece\u63a5\u6536\u5230\u7684DHCP Request\u6216DHCP Ack\u62a5\u6587\u4e2d\u63d0\u53d6\u5e76\u8bb0\u5f55IP\u5730\u5740\u548cMAC\u5730\u5740\u4fe1\u606f\u3002\u53e6\u5916\uff0cDHCP-Snooping\u5141\u8bb8\u5c06\u67d0\u4e2a\u7269\u7406\u7aef\u53e3\u8bbe\u7f6e\u4e3a\u4fe1\u4efb\u7aef\u53e3\u6216\u4e0d\u4fe1\u4efb\u7aef\u53e3\u3002\u4fe1\u4efb\u7aef\u53e3\u53ef\u4ee5\u6b63\u5e38\u63a5\u6536\u5e76\u8f6c\u53d1DHCP Offer\u62a5\u6587\uff0c\u800c\u4e0d\u4fe1\u4efb\u7aef\u53e3\u4f1a\u5c06\u63a5\u6536\u5230\u7684DHCP Offer\u62a5\u6587\u4e22\u5f03\u3002\u8fd9\u6837\uff0c\u53ef\u4ee5\u5b8c\u6210\u4ea4\u6362\u673a\u5bf9\u5047\u5192DHCP Server\u7684\u5c4f\u853d\u4f5c\u7528\uff0c\u786e\u4fdd\u5ba2\u6237\u7aef\u4ece\u5408\u6cd5\u7684DHCP Server\u83b7\u53d6IP\u5730\u5740\u3002
\u3010SwitchA\u76f8\u5173\u914d\u7f6e\u3011
1. \u521b\u5efa\uff08\u8fdb\u5165\uff09VLAN10
[SwitchA]vlan 10
2. \u5c06\u7aef\u53e3E0/1\u3001E0/2\u548cG1/1\u52a0\u5165\u5230VLAN10
[SwitchA-vlan10]port Ethernet 0/1 Ethernet 0/2 GigabitEthernet 1/1
3. \u5168\u5c40\u4f7f\u80fddhcp-snooping\u529f\u80fd
[SwitchA]dhcp-snooping
4. \u5c06\u7aef\u53e3G1/1\u914d\u7f6e\u4e3atrust\u7aef\u53e3\uff0c
[SwitchA-GigabitEthernet1/1]dhcp-snooping trust
\u3010\u8865\u5145\u8bf4\u660e\u3011
\u7531\u4e8eDHCP\u670d\u52a1\u5668\u63d0\u4f9b\u7ed9\u7528\u6237\u5305\u542b\u4e86\u670d\u52a1\u5668\u5206\u914d\u7ed9\u7528\u6237\u7684IP\u5730\u5740\u7684\u62a5\u6587\u2015\u2015\u201ddhcp offer\u201d\u62a5\u6587\uff0c\u7531G1/1\u7aef\u53e3\u8fdb\u5165SwitchA\u5e76\u8fdb\u884c\u8f6c\u53d1\uff0c\u56e0\u6b64\u9700\u8981\u5c06\u7aef\u53e3G1/1\u914d\u7f6e\u4e3a\u201dtrust\u201d\u7aef\u53e3\u3002\u5982\u679cSwitchA\u4e0a\u884c\u63a5\u53e3\u914d\u7f6e\u4e3aTrunk\u7aef\u53e3\uff0c\u5e76\u4e14\u8fde\u63a5\u5230DHCP\u4e2d\u7ee7\u8bbe\u5907\uff0c\u4e5f\u9700\u8981\u5c06\u4e0a\u884c\u7aef\u53e3\u914d\u7f6e\u4e3a\u201dtrust\u201d\u7aef\u53e3\u3002

可以用DHCP中继来实现，只要在各VLAN端口下设置IP HELPER的地址就行，交换机在收到本VLAN的DHCP REQUEST后会自动转发到想对应DHCP服务器。

Switch(config)#int vlan 1
Switch(config-if)#ip helper
Switch(config-if)#ip helper-address 192.168.1.1 //DHCP服务器地址
Switch(config-if)#int vlan 2
Switch(config-if)#ip help
Switch(config-if)#ip helper-address 192.168.2.1 //DHCP服务器地址Switch(config-if)#
追问
只有一台DHCP服务器，它的IP地址是固定唯一的
追答
只要INT VLAN1 或INT VLAN2上设置好IP地址，那个交换机会自动在DHCP地址池里找地址，

例如DHCP POOL有192.168.1.x/24 和192.168.2.X/24,
在交换机上执行：
Switch(config-if)#ip add 192.168.1.254 255.255.255.0
Switch(config-if)#ip helper- 192.168.3.1
Switch(config-if)#int vl 2
Switch(config-if)#ip add 192.168.2.254 255.255.255.0
Switch(config-if)#ip helper- 192.168.3.1
Switch(config-if)#
Switch(config)#int vl 3
Switch(config-if)#ip add 192.168.3.254 255.255.255.0
Switch(config-if)#
假设192.168.3.1是DHCP服务器，把和DHCP服务器连的网口配置成TRUNK,就行了。
192.168.1;2;3的路由转发可以在三层交换机内完成。

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