前言：

该实验是华为模拟器eNSP模拟器、dhcp中继实验
#DHCP中继的应用场景：
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，
一般我们用第二路由器，或则第二台DHCP服务器来分担业务

dhcp 中继

这里设置一台专用的DHCP服务器为pc机配置IP地址

LSW1

<Huawei>system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]sysname LSW1
[LSW1]un in en
Info: Information center is disabled.
[LSW1]vlan bat 10 20
Info: This operation may take a few seconds. Please wait for a moment...done.
[LSW1]int e 0/0/1
[LSW1-Ethernet0/0/1]p l a
[LSW1-Ethernet0/0/1]p d v 10
[LSW1-Ethernet0/0/1]un sh
Info: Interface Ethernet0/0/1 is not shutdown.
[LSW1-Ethernet0/0/1]int e 0/0/2
[LSW1-Ethernet0/0/2]p l a
[LSW1-Ethernet0/0/2]p d v 20
[LSW1-Ethernet0/0/2]un sh
Info: Interface Ethernet0/0/2 is not shutdown.
[LSW1-Ethernet0/0/2]int e 0/0/3
[LSW1-Ethernet0/0/3]p l a
[LSW1-Ethernet0/0/3]p d v 10
[LSW1-Ethernet0/0/3]un sh
Info: Interface Ethernet0/0/3 is not shutdown.
[LSW1-Ethernet0/0/3]int e 0/0/4
[LSW1-Ethernet0/0/4]p l a
[LSW1-Ethernet0/0/4]p d v 20
[LSW1-Ethernet0/0/4]un sh
Info: Interface Ethernet0/0/4 is not shutdown.
[LSW1-Ethernet0/0/4]int g 0/0/1
[LSW1-GigabitEthernet0/0/1]p l t
[LSW1-GigabitEthernet0/0/1]p t a v a
[LSW1-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[LSW1-GigabitEthernet0/0/1]dis vlan
The total number of vlans is : 3
1    common  UT:Eth0/0/5(D)     Eth0/0/6(D)     Eth0/0/7(D)     Eth0/0/8(D)
                Eth0/0/9(D)     Eth0/0/10(D)    Eth0/0/11(D)    Eth0/0/12(D)
                Eth0/0/13(D)    Eth0/0/14(D)    Eth0/0/15(D)    Eth0/0/16(D)
                Eth0/0/17(D)    Eth0/0/18(D)    Eth0/0/19(D)    Eth0/0/20(D)
                Eth0/0/21(D)    Eth0/0/22(D)    GE0/0/1(U)      GE0/0/2(D)
10   common  UT:Eth0/0/1(U)     Eth0/0/3(U)
             TG:GE0/0/1(U)
20   common  UT:Eth0/0/2(U)     Eth0/0/4(U)
             TG:GE0/0/1(U)
[LSW1-GigabitEthernet0/0/1]
[LSW1-GigabitEthernet0/0/1]dis int b
InUti/OutUti: input utility/output utility
Interface                   PHY   Protocol InUti OutUti   inErrors  outErrors
Ethernet0/0/1               up    up          0%     0%          0          0
Ethernet0/0/2               up    up          0%     0%          0          0
Ethernet0/0/3               up    up          0%     0%          0          0
Ethernet0/0/4               up    up          0%     0%          0          0
GigabitEthernet0/0/1        up    up          0%     0%          0          0

R1

<Huawei>system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]dhcp enable
Info: The operation may take a few seconds. Please wait for a moment.done.
[Huawei]int g 0/0/0
[Huawei-GigabitEthernet0/0/0]ip add 14.0.0.1 24
[Huawei-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[Huawei-GigabitEthernet0/0/0]int g 0/0/3
[Huawei-GigabitEthernet0/0/3]ip add 12.0.0.1 24
[Huawei-GigabitEthernet0/0/3]un sh
Info: Interface GigabitEthernet0/0/3 is not shutdown.
[Huawei-GigabitEthernet0/0/3]q
[Huawei]vlan bat 10 20
Info: This operation may take a few seconds. Please wait for a moment...done.
[Huawei]int g 0/0/1.10
[Huawei-GigabitEthernet0/0/1.10]dot1q termination vid 10
[Huawei-GigabitEthernet0/0/1.10]ip add 192.168.10.1 24
[Huawei-GigabitEthernet0/0/1.10]un sh
Info: Interface GigabitEthernet0/0/1.10 is not shutdown.
[Huawei-GigabitEthernet0/0/1.10]q
[Huawei]int g 0/0/1.10
[Huawei-GigabitEthernet0/0/1.10]dis this
#
interface GigabitEthernet0/0/1.10
 dot1q termination vid 10
 ip address 192.168.10.1 255.255.255.0
#
return
[Huawei-GigabitEthernet0/0/1.10]a b e
[Huawei-GigabitEthernet0/0/1.10]dhcp select relay
[Huawei-GigabitEthernet0/0/1.10]dhcp relay server-ip 14.0.0.2
[Huawei-GigabitEthernet0/0/1.10]q
[Huawei]int g 0/0/1.20
[Huawei-GigabitEthernet0/0/1.20]dot1q termination vid 20
[Huawei-GigabitEthernet0/0/1.20]ip add 192.168.20.1 24
[Huawei-GigabitEthernet0/0/1.20]a b e
[Huawei-GigabitEthernet0/0/1.20]dhcp select relay
[Huawei-GigabitEthernet0/0/1.20]dhcp relay server-ip 14.0.0.2
[Huawei-GigabitEthernet0/0/1.20]q
[Huawei]ip route-static 15.0.0.0 24 12.0.0.2
[Huawei]

R2

<Huawei>system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]sysname R2
[R2]un in en
Info: Information center is disabled.
[R2]int g 0/0/3
[R2-GigabitEthernet0/0/3]ip add 12.0.0.2 24
[R2-GigabitEthernet0/0/3]un sh
Info: Interface GigabitEthernet0/0/3 is not shutdown.
[R2-GigabitEthernet0/0/3]int e 0/0/0
[R2-Ethernet0/0/0]q
[R2]dhcp enable
Info: The operation may take a few seconds. Please wait for a moment.done.
[R2]int e 0/0/0
[R2-Ethernet0/0/0]ip add 15.0.0.1 24
[R2-Ethernet0/0/0]un sh
Info: Interface Ethernet0/0/0 is not shutdown.
[R2-Ethernet0/0/0]dhcp select relay
[R2-Ethernet0/0/0]dhcp relay server-ip 14.0.0.2
[R2-Ethernet0/0/0]q
[R2]ip route-static 14.0.0.0 24 12.0.0.1
[R2]ip route-static 192.168.0.0 16 12.0.0.1
[R2]dis ip ?
  as-path-filter       Specify regular expression access list number
  community-filter     Add a community-filter entry
  error                Information of error packet
  extcommunity-filter  Match BGP/*** extended community filter
  ha                   Display information of socket HA
  host                 Host table(s)
  interface            Show information of interfaces
  ip-prefix            Specify an address prefix-list
  ipv6-prefix          Specify an IPv6 address prefix-list
  netstream            Netstream feature
  policy-based-route   Display policy based routing information
  pool                 Configure a local IP pool
  prefix-limit         Prefix limit
  rd-filter            Route-distinguisher filter
  routing-table        Routing table
  socket               Display information of created sockets
  statistics           Display statistics information of datagram
  topology             The name of topology
  userlog              Userlog feature
  ***-instance         *** instance information
[R2]dis ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 8        Routes : 8        

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

       12.0.0.0/24  Direct  0    0           D   12.0.0.2        GigabitEthernet
0/0/3
       12.0.0.2/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/3
       14.0.0.0/24  Static  60   0          RD   12.0.0.1        GigabitEthernet
0/0/3
       15.0.0.0/24  Direct  0    0           D   15.0.0.1        Ethernet0/0/0
       15.0.0.1/32  Direct  0    0           D   127.0.0.1       Ethernet0/0/0
      127.0.0.0/8   Direct  0    0           D   127.0.0.1       InLoopBack0
      127.0.0.1/32  Direct  0    0           D   127.0.0.1       InLoopBack0
    192.168.0.0/16  Static  60   0          RD   12.0.0.1        GigabitEthernet
0/0/3
[R2]

R3

<Huawei>system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]sysname R3
[R3]un in en
Info: Information center is disabled.
[R3]dhcp enable
Info: The operation may take a few seconds. Please wait for a moment.done.
[R3]int g 0/0/0
[R3-GigabitEthernet0/0/0]ip add 14.0.0.2 24
[R3-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R3-GigabitEthernet0/0/0]dhcp select global
[R3-GigabitEthernet0/0/0]q
[R3]ip pool dhcp192.168.10.0
Info:It‘s successful to create an IP address pool.
[R3-ip-pool-dhcp192.168.10.0]network 192.168.10.0 mask 24
[R3-ip-pool-dhcp192.168.10.0]gateway 192.168.10.1
[R3-ip-pool-dhcp192.168.10.0]dns-list 1.1.1.1
[R3-ip-pool-dhcp192.168.10.0]?
ip-pool view commands:
  arp-ping             ARP-ping
  ce-ping              Ce-ping tool
  configuration        Configuration interlock
  display              Display current system information
  dns-list             Configure DNS servers
  domain-name          Configure domain name
  excluded-ip-address  Mark disable IP addresses
  gateway-list         Configure the gateway
  import               Imports the following network configuration parameters
                       from a central server into local ip pool database:
                       domain name, dns server and netbios server.
  lease                Configure the lease of the IP pool
  lock                 Lock the IP pool
  mac-populate         Populate an OAM MAC to FDB entry
  mac-purge            Purge an OAM MAC from FDB entry
  monitor              System monitor dynamic show
  mtrace               Trace route to multicast source
  nbns-list            Configure the windows‘s netbios name servers
  netbios-type         Netbios node type
  network              Add a network
  next-server          The address of the server to use in the next step of the
                       client‘s bootstrap process.
  option               Configure the DHCP options
  option121            DHCP option 121
  option184            DHCP option 184
  ping                 Send echo messages
  quit                 Exit from current command view
  reset                Reset operation
  return               Exit to user view
  screen-width         Set screen width
  static-bind          Static bind
  test-aaa             Accounts test
  trace                Trace route (switch) to host on Data Link Layer
  tracert              Trace route to host
  undo                 Cancel current setting
  ***-instance         Config *** instance
  vrbd                 Display version information

[R3-ip-pool-dhcp192.168.10.0]q
[R3]ip pool dhcp192.168.20.0
Info:It‘s successful to create an IP address pool.
[R3-ip-pool-dhcp192.168.20.0]network 192.168.20.0 mask 24
[R3-ip-pool-dhcp192.168.20.0]gateway-list 192.168.20.1
[R3-ip-pool-dhcp192.168.20.0]dns-list 1.1.1.1 2.2.2.2
[R3-ip-pool-dhcp192.168.20.0]q
[R3]ip pool dhcp15.0.0.0
Info:It‘s successful to create an IP address pool.
[R3-ip-pool-dhcp15.0.0.0]network 15.0.0.0 mask 24
[R3-ip-pool-dhcp15.0.0.0]static-bind ip-address 15.0.0.88 mac-address 5489-98A
B-2A25
Error:Please configure the gateway first.
[R3-ip-pool-dhcp15.0.0.0]gateway-list 15.0.0.1
[R3-ip-pool-dhcp15.0.0.0]static-bind ip-address 15.0.0.88 mac-address 5489-98AB-
2A25
[R3-ip-pool-dhcp15.0.0.0]q
[R3]ip route-static 0.0.0.0 0.0.0.0 14.0.0.1
[R3]

结果如下

原文地址：https://blog.51cto.com/14558445/2457829