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对于职业网管来说，把路由器设置成dhcp服务器（DHCP server）是一个必备技能，下面就以思科2514路由器做例子来说明设置的过程。
网络连接的拓扑很简单，就是一个台linux服务器连接cisco2514路由器的e0端口，然后e1口再连接一台装了windows xp的pc，把pc设为自动获得ip地址。
看来也可以把一个3层的交换机设为dhcp server ，分了几个网段（vlan）就设几个pool 。但若是在一个大的网络环境中，这显然是加重了3层交换机的负担，各位作售前的前辈，有过这样的设计吗？给分析分析这个解决方法好吗？
Trace#sh ru
Building configuration...
Current configuration : 1035 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Trace
!
logging rate-limit console 10 except errors
!
ip subnet-zero
no ip finger
no ip domain-lookup
!
ip dhcp pool lan1
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 1.1.1.1
lease 0 0 30
!
ip dhcp pool lan2
network 192.168.2.0 255.255.255.0
dns-server 1.1.1.1
default-router 192.168.2.1
lease 0 0 30
!
cns event-service server
!
!
!
interface Ethernet0
ip address 192.168.1.1 255.255.255.0
no keepalive
!
interface Ethernet1
ip address 192.168.2.1 255.255.255.0
no keepalive
!
interface Serial0
no ip address
shutdown
no fair-queue
!
interface Serial1
no ip address
shutdown
!
ip kerberos source-interface any
ip classless
no ip http server
!
!
alias exec sr sh ru
alias exec ct conf t
alias exec sir sh ip ro
!
line con 0
exec-timeout 0 0
logging synchronous
transport input none
line aux 0
line vty 0 4
!
end
Trace#debug ip dhcp server events
00:42:23: DHCPD: assigned IP address 192.168.1.2 to client 0152.54ab.2a47.92.
Trace# http://www.luyouqiwang.com/14118/
00:42:25: DHCPD: assigned IP address 192.168.2.2 to client 0100.000e.82e9.d4.
-------------------------------------------------------------------------------
Trace#sh ip dhcp binding
IP address Hardware address Lease expiration Type
192.168.1.2 0152.54ab.2a47.92 Mar 01 1993 01:12 AM Automatic
192.168.2.2 0100.000e.82e9.d4 Mar 01 1993 01:12 AM Automatic
-------------------------------------------------------------------------------
Trace#sh ip dhcp server statistics
Memory usage 14019
Address pools 2
Database agents 0
Automatic bindings 2
Manual bindings 0
Expired bindings 0
Malformed messages 0
Message Received
BOOTREQUEST 0
DHCPDISCOVER 3
DHCPREQUEST 4
DHCPDECLINE 0
DHCPRELEASE 0
DHCPINform 0
Message Sent
BOOTREPLY 0
DHCPOFFER 3
DHCPACK 4
DHCPNAK 0
Trace#
-----------------------------------------------------------------------------
C:>ipconfig/all
Ethernet adapter 本地连接:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Fujitsu FMV-J182A
Physical Address. . . . . . . . . : 00-00-0E-82-E9-D4
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.2.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.2.1
DHCP Server . . . . . . . . . . . : 192.168.2.1
DNS Servers . . . . . . . . . . . : 1.1.1.1
Lease Obtained. . . . . . . . . . : 2003年2月7日 11:47:01
Lease Expires . . . . . . . . . . : 2003年2月7日 12:17:01
C:>ping 192.168.1.2
Pinging 192.168.1.2 with 32 bytes of data:
Reply from 192.168.1.2: bytes=32 time=1ms TTL=254
Reply from 192.168.1.2: bytes=32 time=1ms TTL=254
Reply from 192.168.1.2: bytes=32 time=1ms TTL=254
Reply from 192.168.1.2: bytes=32 time=1ms TTL=254
Ping statistics for 192.168.1.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 1ms, Average = 1ms
Trace#
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