• 初谈DHCP中继原理和配置


    DHCP中继应用场景

                      通常在DHCP分配网段过多的情况下,网关路由器上配置DHCP服务压力过大,用路由器或第二台DHCP服务器来分担业务。

    以下通过一个实验诠释DHCP中继的配置

          

    LSW1

    <Huawei>

    <Huawei>un te m

    Info: Current terminal monitor is off.

    <Huawei>sys

    Enter system view, return user view with Ctrl+Z.

    [Huawei]sys SW1

    [SW1]int e0/0/1

    [SW1-Ethernet0/0/1]q

    [SW1]vlan b 10 20

    Info: This operation may take a few seconds. Please wait for a moment...done.

    [SW1]int e0/0/1

    [SW1-Ethernet0/0/1]port link-type access

    [SW1-Ethernet0/0/1]port default vlan 10

    [SW1-Ethernet0/0/1]un sh

    Info: Interface Ethernet0/0/1 is not shutdown.

    [SW1-Ethernet0/0/1]int e0/0/2

    [SW1-Ethernet0/0/2]p l a

    [SW1-Ethernet0/0/2]p d v 20

    [SW1-Ethernet0/0/2]un sh

    Info: Interface Ethernet0/0/2 is not shutdown.

    [SW1-Ethernet0/0/2]int e0/0/3

    [SW1-Ethernet0/0/3]p l a

    [SW1-Ethernet0/0/3]p d v 10

    [SW1-Ethernet0/0/3]un sh

    Info: Interface Ethernet0/0/3 is not shutdown.

    [SW1-Ethernet0/0/3]int e0/0/4

    [SW1-Ethernet0/0/4]p l a

    [SW1-Ethernet0/0/4]p d v 20

    [SW1-Ethernet0/0/4]un sh

    Info: Interface Ethernet0/0/4 is not shutdown.

    [SW1-Ethernet0/0/4]int g0/0/1

    [SW1-GigabitEthernet0/0/1]p l t

    [SW1-GigabitEthernet0/0/1]p t a v a

    [SW1-GigabitEthernet0/0/1]q

    R1

    <Huawei>un te m

    Info: Current terminal monitor is off.

    <Huawei>sys

    Enter system view, return user view with Ctrl+Z.

    [Huawei]sys R1

    [R1]int g0/0/0

    [R1-GigabitEthernet0/0/0]ip add 14.0.0.2 24

    [R1-GigabitEthernet0/0/0]dhcp se

    [R1-GigabitEthernet0/0/0]dhcp select gl

    [R1-GigabitEthernet0/0/0]dhcp select global

    Error: Please enable DHCP in the global view first.

    [R1-GigabitEthernet0/0/0]q

    [R1]dhcp en

    [R1]dhcp enable ##开启DHCP服务

    Info: The operation may take a few seconds. Please wait for a moment.done.

    [R1]in g0/0/0

    [R1-GigabitEthernet0/0/0]dhcp select global(请求DHCP服务)

    [R1-GigabitEthernet0/0/0]q

    [R1]ip pool DHCP(设置地址池)

    [R1]ip pool DHCP15.0.0.0

    Info: It's successful to create an IP address pool.

    [R1-ip-pool-DHCP15.0.0.0]netw

    [R1-ip-pool-DHCP15.0.0.0]network 15.0.0.0 m 24(设置网段)

    [R1-ip-pool-DHCP15.0.0.0]gate

    [R1-ip-pool-DHCP15.0.0.0]gateway-list 15.0.0.1(设置网关)

    [R1-ip-pool-DHCP15.0.0.0]dns

    [R1-ip-pool-DHCP15.0.0.0]dns-list 8.8.8.8 2.2.2.2(设置dns)

    [R1-ip-pool-DHCP15.0.0.0]q

    [R1]ip pool DHCPvlan10

    Info: It's successful to create an IP address pool.

    [R1-ip-pool-DHCPvlan10]netw

    [R1-ip-pool-DHCPvlan10]network 192.168.10.0 m 24

    [R1-ip-pool-DHCPvlan10]gat

    [R1-ip-pool-DHCPvlan10]gateway-list 192.168.10.1

    [R1-ip-pool-DHCPvlan10]dns

    [R1-ip-pool-DHCPvlan10]dns-list 8.8.8.8 2.2.2.2

    [R1-ip-pool-DHCPvlan10]q

    [R1]ip pool DHCP

    [R1]ip pool DHCPVLAN20

    Info: It's successful to create an IP address pool.

    [R1-ip-pool-DHCPVLAN20]netw

    [R1-ip-pool-DHCPVLAN20]network 192.168.20.0 m 24

    [R1-ip-pool-DHCPVLAN20]gat

    [R1-ip-pool-DHCPVLAN20]gateway-list 192.168.20.1

    [R1-ip-pool-DHCPVLAN20]dns

    [R1-ip-pool-DHCPVLAN20]dns-list 8.8.8.8 2.2.2.2

    [R1-ip-pool-DHCPVLAN20]q

    [R1]ip route-s

    [R1]ip route-static 0.0.0.0 0.0.0.0 14.0.0.1

    R2

    <Huawei>sys

    Enter system view, return user view with Ctrl+Z.

    [Huawei]sys R2

    [R2]q

    <R2>un te m

    Info: Current terminal monitor is off.

    <R2>sys

    Enter system view, return user view with Ctrl+Z.

    [R2]int g0/0/2

    [R2-GigabitEthernet0/0/2]ip add 14.0.0.1 24

    [R2]int g0/0/0

    [R2-GigabitEthernet0/0/0]ip add 12.0.0.1 24

    [R2]int g0/0/1

    [R2-GigabitEthernet0/0/1]un sh

    Info: Interface GigabitEthernet0/0/1 is not shutdown.

    [R2-GigabitEthernet0/0/1]int g0/0/1.10

    [R2-GigabitEthernet0/0/1.10]dot1q termination vid 10(该接口属于vlan10)

    [R2-GigabitEthernet0/0/1.10]ip add 192.168.10.1 24

    [R2-GigabitEthernet0/0/1.10]arp broadcast enable(开启arp广播

    [R2-GigabitEthernet0/0/1.10]un sh

    Info: Interface GigabitEthernet0/0/1.10 is not shutdown.

    [R2-GigabitEthernet0/0/1.10]int g0/0/1.20

    [R2-GigabitEthernet0/0/1.20]d t v 20

    [R2-GigabitEthernet0/0/1.20]ip add 192.168.20.1 24

    [R2-GigabitEthernet0/0/1.20]a b e

    [R2-GigabitEthernet0/0/1.20]un sh

    Info: Interface GigabitEthernet0/0/1.20 is not shutdown.

    [R2-GigabitEthernet0/0/1.20]q

    [R2]dhcp en

    [R2]dhcp enable

    Info: The operation may take a few seconds. Please wait for a moment.done.

    [R2]int g0/0/1.10(子接口下宣告DHCP中继)

    [R2-GigabitEthernet0/0/1.10]dhcp se

    [R2-GigabitEthernet0/0/1.10]dhcp select ?

      global     Local server

      interface  Interface server pool

      relay      DHCP relay(选择relay)

    [R2-GigabitEthernet0/0/1.10]dhcp select relay(基于DHCP中继)

    [R2-GigabitEthernet0/0/1.10]dhcp re

    [R2-GigabitEthernet0/0/1.10]dhcp relay se

    [R2-GigabitEthernet0/0/1.10]dhcp relay server-ip 14.0.0.2

    [R2-GigabitEthernet0/0/1.10]int g0/0/1.20

    [R2-GigabitEthernet0/0/1.20]dhcp sel

    [R2-GigabitEthernet0/0/1.20]dhcp select re

    [R2-GigabitEthernet0/0/1.20]dhcp select relay

    [R2-GigabitEthernet0/0/1.20]d r s 14.0.0.2

    [R2-GigabitEthernet0/0/1.20]un sh

    Info: Interface GigabitEthernet0/0/1.20 is not shutdown.

    [R2-GigabitEthernet0/0/1.20]q

    [R2]ip route-s

    [R2]ip route-static 15.0.0.1 24 12.0.0.2(设置静态路由)

    R3

    <R3>sys

    Enter system view, return user view with Ctrl+Z.

    [R3]int g0/0/0

    [R3-GigabitEthernet0/0/0]ip add 12.0.0.2 24

    [R3-GigabitEthernet0/0/0]un sh

    Info: Interface GigabitEthernet0/0/0 is not shutdown.

    [R3-GigabitEthernet0/0/0]q

    [R3]int g0/0/1

    [R3-GigabitEthernet0/0/1]q

    [R3]dhcp en

    [R3]dhcp enable

    Info: The operation may take a few seconds. Please wait for a moment.done.

    [R3]int g0/0/1

    [R3-GigabitEthernet0/0/1]ip add 15.0.0.1 24

    [R3-GigabitEthernet0/0/1]dhcp sel

    [R3-GigabitEthernet0/0/1]dhcp select re

    [R3-GigabitEthernet0/0/1]dhcp select relay

    [R3-GigabitEthernet0/0/1]dhcp re

    [R3-GigabitEthernet0/0/1]dhcp relay se

    [R3-GigabitEthernet0/0/1]dhcp relay server-ip 14.0.0.2

    [R3-GigabitEthernet0/0/1]un sh

    Info: Interface GigabitEthernet0/0/1 is not shutdown.

    [R3-GigabitEthernet0/0/1]q

    [R3]ip ro

    [R3]ip route-static 0.0.0.0 0.0.0.0 12.0.0.1(设置默认路由)

    设置结束后,打开PC5,设置获取ip检验

    道阻且长,行则将至!加油! --不是冷漠
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  • 原文地址:https://www.cnblogs.com/bushilengmo/p/13208550.html
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