配置设备作为DHCP中继示例（中继与服务器之间跨越GRE隧道）

S2720, S5700, S6700 V200R019C10 配置指南-IP业务

本文档介绍了IP业务的配置，具体包括IP地址配置、ARP配置、DHCP配置、DHCP策略VLAN配置、DNS配置、mDNS网关配置、mDNS中继配置、UDP Helper配置、IP性能优化配置、IPv6基础配置、DHCPv6配置、IPv6 DNS配置、IPv6 over IPv4隧道配置和IPv4 over IPv6隧道配置。

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配置设备作为DHCP中继示例（中继与服务器之间跨越GRE隧道）

组网需求

如图3-16所示，某企业的总部和分支机构部署在不同的区域，为了使企业总部和分支机构能够跨越公网互联，总部与分支机构之间部署了GRE隧道。为了方便统一管理，企业管理员在总部设备Switch_1上部署DHCP服务器，为总部和分支机构的终端分配IP地址，总部和分支机构规划的IP地址网段分别为10.1.1.0/24和10.2.1.0/24。

仅S5720-EI、S5720-HI、S5730-HI、S5731-H-K、S5731-H、S5731S-H、S5731-S、S5731S-S、S6720-HI、S5732-H-K、S5732-H、S6730-H、S6730-H-K、S6730S-H、S6730-S、S6730S-S、S6720-EI和S6720S-EI支持GRE功能。

图3-16 配置GRE隧道实现为跨公网的用户分配IP地址组网图

配置思路

DHCP中继与服务器之间跨越GRE隧道时，DHCP中继的配置思路如下：

在Switch_1、Switch_2和Switch_3之间运行OSPF路由协议实现设备间路由互通。
在Switch_1和Switch_3上，配置Tunnel接口，创建GRE隧道。
在Switch_1上，配置基于全局地址池的DHCP服务器，实现DHCP服务器从全局地址池中选择IP地址分配给总部和分支机构的终端。
在Switch_3上，配置DHCP中继功能，作为分支机构的网关转发终端与DHCP服务器之间的DHCP报文，实现终端向DHCP服务器申请IP地址。

二层交换机LSW_1和LSW_2上，需要配置接口的链路类型和加入的VLAN，实现二层互通。

操作步骤

配置Switch_1～Switch_3上各物理接口的IP地址

# 配置Switch_1。

<HUAWEI> system-view
[HUAWEI] sysname Switch_1
[Switch_1] vlan batch 10 30
[Switch_1] interface gigabitethernet 0/0/1
[Switch_1-GigabitEthernet0/0/1] port link-type trunk
[Switch_1-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[Switch_1-GigabitEthernet0/0/1] quit
[Switch_1] interface gigabitethernet 0/0/2
[Switch_1-GigabitEthernet0/0/2] port link-type trunk
[Switch_1-GigabitEthernet0/0/2] port trunk allow-pass vlan 30
[Switch_1-GigabitEthernet0/0/2] quit
[Switch_1] interface vlanif 10
[Switch_1-Vlanif10] ip address 192.168.20.1 24
[Switch_1-Vlanif10] quit
[Switch_1] interface vlanif 30
[Switch_1-Vlanif30] ip address 10.1.1.1 24
[Switch_1-Vlanif30] quit

# 配置Switch_2。

<HUAWEI> system-view
[HUAWEI] sysname Switch_2
[Switch_2] vlan batch 10 20
[Switch_2] interface gigabitethernet 0/0/1
[Switch_2-GigabitEthernet0/0/1] port link-type trunk
[Switch_2-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[Switch_2-GigabitEthernet0/0/1] quit
[Switch_2] interface gigabitethernet 0/0/2
[Switch_2-GigabitEthernet0/0/2] port link-type trunk
[Switch_2-GigabitEthernet0/0/2] port trunk allow-pass vlan 20
[Switch_2-GigabitEthernet0/0/2] quit
[Switch_2] interface vlanif 10
[Switch_2-Vlanif10] ip address 192.168.20.2 24
[Switch_2-Vlanif10] quit
[Switch_2] interface vlanif 20
[Switch_2-Vlanif20] ip address 192.168.30.1 24
[Switch_2-Vlanif20] quit

# 配置Switch_3。

<HUAWEI> system-view
[HUAWEI] sysname Switch_3
[Switch_3] vlan batch 20 30
[Switch_3] interface gigabitethernet 0/0/1
[Switch_3-GigabitEthernet0/0/1] port link-type trunk
[Switch_3-GigabitEthernet0/0/1] port trunk allow-pass vlan 20
[Switch_3-GigabitEthernet0/0/1] quit
[Switch_3] interface gigabitethernet 0/0/2
[Switch_3-GigabitEthernet0/0/2] port link-type trunk
[Switch_3-GigabitEthernet0/0/2] port trunk allow-pass vlan 30
[Switch_3-GigabitEthernet0/0/2] quit
[Switch_3] interface vlanif 20
[Switch_3-Vlanif20] ip address 192.168.30.2 24
[Switch_3-Vlanif20] quit
[Switch_3] interface vlanif 30
[Switch_3-Vlanif30] ip address 10.2.1.1 24
[Switch_3-Vlanif30] quit

配置Switch_1、Switch_2和Switch_3之间使用OSPF路由

# 配置Switch_1。

[Switch_1] ospf 1
[Switch_1-ospf-1] area 0
[Switch_1-ospf-1-area-0.0.0.0] network 192.168.20.0 0.0.0.255
[Switch_1-ospf-1-area-0.0.0.0] quit
[Switch_1-ospf-1] quit

# 配置Switch_2。

[Switch_2] ospf 1
[Switch_2-ospf-1] area 0
[Switch_2-ospf-1-area-0.0.0.0] network 192.168.20.0 0.0.0.255
[Switch_2-ospf-1-area-0.0.0.0] network 192.168.30.0 0.0.0.255
[Switch_2-ospf-1-area-0.0.0.0] quit
[Switch_2-ospf-1] quit

# 配置Switch_3。

[Switch_3] ospf 1
[Switch_3-ospf-1] area 0
[Switch_3-ospf-1-area-0.0.0.0] network 192.168.30.0 0.0.0.255
[Switch_3-ospf-1-area-0.0.0.0] quit
[Switch_3-ospf-1] quit

配置Tunnel接口

# 配置Switch_1。

[Switch_1] interface tunnel 1
[Switch_1-Tunnel1] tunnel-protocol gre
[Switch_1-Tunnel1] ip address 192.168.40.1 24
[Switch_1-Tunnel1] source 192.168.20.1
[Switch_1-Tunnel1] destination 192.168.30.2
[Switch_1-Tunnel1] quit

# 配置Switch_3。

[Switch_3] interface tunnel 1
[Switch_3-Tunnel1] tunnel-protocol gre
[Switch_3-Tunnel1] ip address 192.168.40.2 24
[Switch_3-Tunnel1] source 192.168.30.2
[Switch_3-Tunnel1] destination 192.168.20.1
[Switch_3-Tunnel1] quit

配置Switch_1的DHCP服务器功能

# 使能DHCP服务，缺省未使能。

[Switch_1] dhcp enable

# 创建全局地址池并配置相关参数。

[Switch_1] ip pool pool1
[Switch_1-ip-pool-pool1] network 10.2.1.0 mask 255.255.255.0
[Switch_1-ip-pool-pool1] gateway-list 10.2.1.1
[Switch_1-ip-pool-pool1] quit
[Switch_1] ip pool pool2
[Switch_1-ip-pool-pool2] network 10.1.1.0 mask 255.255.255.0
[Switch_1-ip-pool-pool2] gateway-list 10.1.1.1
[Switch_1-ip-pool-pool2] quit

# 配置接口VLANIF30下的终端从全局地址池中获取IP地址。

[Switch_1] interface vlanif 30
[Switch_1-Vlanif30] dhcp select global
[Switch_1-Vlanif30] quit

# 配置到分支机构终端网段的静态路由。

[Switch_1] ip route-static 10.2.1.0 255.255.255.0 tunnel 1

配置Switch_3的DHCP中继功能

# 使能DHCP服务，缺省未使能。

[Switch_3] dhcp enable

# 配置接口VLANIF30的DHCP中继功能并指定代理的DHCP服务器地址。

[Switch_3] interface vlanif 30
[Switch_3-Vlanif30] dhcp select relay 
[Switch_3-Vlanif30] dhcp relay server-ip 10.1.1.1
[Switch_3-Vlanif30] quit

# 配置到服务器网段的静态路由。

[Switch_3] ip route-static 10.1.1.0 255.255.255.0 tunnel 1

配置各终端自动获取IP地址（以操作系统为Windows 7的PC为例）
1. 右击桌面“网络”，单击“属性”，进入“网络和共享中心”窗口。
2. 单击“本地连接”，进入“本地连接状态”窗口。
3. 单击“属性”，进入“本地链接属性”窗口。
4. 选择“Internet协议版本4（TCP/IPv4）”，点击“属性”，进入“Internet协议版本4（TCP/IPv4）属性”窗口，选择“自动获得IP地址”，单击“确定”。

验证配置结果

# 在Switch_3上执行命令display dhcp relay interface vlanif 30用来查看DHCP中继的配置信息。

[Switch_3] display dhcp relay interface vlanif 30
 DHCP relay agent running information of interface Vlanif30 :
 Server IP address [00] : 10.1.1.1
 Gateway address in use : 10.2.1.1

# 在Switch_1上执行命令display ip pool查看地址池pool1和pool2的IP地址分配情况。假设总部终端有100个，分支机构终端有50个。

[Switch_1] display ip pool name pool1
  Pool-name        : pool1
  Pool-No          : 0
  Lease            : 1 Days 0 Hours 0 Minutes
  Domain-name      : -
  DNS-server0      : -
  NBNS-server0     : -
  Netbios-type     : -
  Position         : Local
  Status           : Unlocked
  Gateway-0        : 10.2.1.1
  Network          : 10.2.1.0
  Mask             : 255.255.255.0
  VPN instance     : --
  Logging          : Disable
  Conflicted address recycle interval: -
  Address Statistic: Total       :253       Used        :50
  Idle        :203       Expired     :0
  Conflict    :0         Disabled     :0

 -------------------------------------------------------------------------------
  Network section
         Start           End       Total    Used Idle(Expired) Conflict Disabled
 -------------------------------------------------------------------------------
        10.2.1.1      10.2.1.254     253      50        203(0)       0     0
 -------------------------------------------------------------------------------

[Switch_1] display ip pool name pool2
  Pool-name        : pool2
  Pool-No          : 1
  Lease            : 1 Days 0 Hours 0 Minutes
  Domain-name      : -
  DNS-server0      : -
  NBNS-server0     : -
  Netbios-type     : -
  Position         : Local
  Status           : Unlocked
  Gateway-0        : 10.1.1.1
  Network          : 10.1.1.0
  Mask             : 255.255.255.0
  VPN instance     : --
  Logging          : Disable
  Conflicted address recycle interval: -
  Address Statistic: Total       :253       Used        :50
  Idle        :203       Expired     :0
  Conflict    :0         Disabled     :0

 -------------------------------------------------------------------------------
  Network section
         Start           End       Total    Used Idle(Expired) Conflict Disabled
 -------------------------------------------------------------------------------
        10.1.1.1      10.1.1.254     253     100        153(0)       0     0
 -------------------------------------------------------------------------------

配置文件

Switch_1的配置文件

#
sysname Switch_1
#
vlan batch 10 30
#
dhcp enable
# 
ip pool pool1
 gateway-list 10.2.1.1
 network 10.2.1.0 mask 255.255.255.0
# 
ip pool pool2
 gateway-list 10.1.1.1
 network 10.1.1.0 mask 255.255.255.0
# 
interface Vlanif10
 ip address 192.168.20.1 255.255.255.0
#
interface Vlanif30
 ip address 10.1.1.1 255.255.255.0
 dhcp select global
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
interface Tunnel1
 ip address 192.168.40.1 255.255.255.0
 tunnel-protocol gre
 source 192.168.20.1
 destination 192.168.30.2
#
ospf 1
 area 0.0.0.0
  network 192.168.20.0 0.0.0.255
#
ip route-static 10.2.1.0 255.255.255.0 Tunnel1
#
return

Switch_2的配置文件

#
sysname Switch_2
#
vlan batch 10 20
#
interface Vlanif10
 ip address 192.168.20.2 255.255.255.0
#
interface Vlanif20
 ip address 192.168.30.1 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
ospf 1
 area 0.0.0.0
  network 192.168.20.0 0.0.0.255
  network 192.168.30.0 0.0.0.255
#
return

Switch_3的配置文件

#
sysname Switch_3
#
vlan batch 20 30
#
dhcp enable
# 
interface Vlanif20
 ip address 192.168.30.2 255.255.255.0
#
interface Vlanif30
 ip address 10.2.1.1 255.255.255.0
 dhcp select relay
 dhcp relay server-ip 10.1.1.1  
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 20
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
interface Tunnel1
 ip address 192.168.40.2 255.255.255.0
 tunnel-protocol gre
 source 192.168.30.2
 destination 192.168.20.1
#
ospf 1
 area 0.0.0.0
  network 192.168.30.0 0.0.0.255
#
ip route-static 10.1.1.0 255.255.255.0 Tunnel1
#
return

组网需求
配置思路

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更新时间：2021-10-20

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