华为删除dhcp地址池_配置设备作为DHCP中继示例

补发一下DHCP中继

组网需求

如图1所示，某企业部署一台DHCP服务器（SwitchB），希望为企业内终端动态分配IP地址，终端与DHCP服务器部署在不同网段。

图1 配置设备作为DHCP中继组网图

配置思路

配置设备作为DHCP中继的配置思路如下：

在SwitchA上配置DHCP中继，设备作为DHCP中继转发终端与DHCP服务器间的DHCP报文，从而实现DHCP服务器为终端分配IP地址。

DHCP服务器（SwitchB）以S2750, S5700, S6720系列交换机为例。

操作步骤

1. 在SwitchA上配置DHCP中继。

# 配置接口加入VLAN。

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 100 200
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] port link-type hybrid
[SwitchA-GigabitEthernet0/0/2] port hybrid pvid vlan 100
[SwitchA-GigabitEthernet0/0/2] port hybrid untagged vlan 100
[SwitchA-GigabitEthernet0/0/2] quit
[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type hybrid
[SwitchA-GigabitEthernet0/0/1] port hybrid pvid vlan 200
[SwitchA-GigabitEthernet0/0/1] port hybrid untagged vlan 200
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface vlanif 200
[SwitchA-Vlanif200] ip address 10.10.20.1 24
[SwitchA-Vlanif200] quit

# 在接口下使能DHCP中继功能。

[SwitchA] dhcp enable
[SwitchA] interface vlanif 100
[SwitchA-Vlanif100] ip address 10.20.20.1 24
[SwitchA-Vlanif100] dhcp select relay
[SwitchA-Vlanif100] dhcp relay server-ip 10.10.20.2
[SwitchA-Vlanif100] quit

2. 在SwitchA上配置缺省路由。

[SwitchA] ip route-static 0.0.0.0 0.0.0.0 10.10.20.2

3. 在SwitchB上配置基于全局地址池的DHCP服务器功能。

# 使能DHCP服务。

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] dhcp enable

# 配置接口VLANIF200工作在全局地址池模式。

[SwitchB] vlan 200
[SwitchB-vlan200] quit
[SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] port link-type hybrid
[SwitchB-GigabitEthernet0/0/1] port hybrid pvid vlan 200
[SwitchB-GigabitEthernet0/0/1] port hybrid untagged vlan 200
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface vlanif 200
[SwitchB-Vlanif200] ip address 10.10.20.2 24
[SwitchB-Vlanif200] dhcp select global
[SwitchB-Vlanif200] quit

# 创建地址池并配置相关属性。

[SwitchB] ip pool pool1
[SwitchB-ip-pool-pool1] network 10.20.20.0 mask 24
[SwitchB-ip-pool-pool1] gateway-list 10.20.20.1
[SwitchB-ip-pool-pool1] option121 ip-address 10.10.20.0 24 10.20.20.1
[SwitchB-ip-pool-pool1] quit

4. 在SwitchB上配置缺省路由。

[SwitchB] ip route-static 10.20.20.0 255.255.255.0 10.10.20.1

5. 验证配置结果。

# 在SwitchA上执行命令display dhcp relay interface vlanif 100命令用来查看DHCP中继的配置信息。

[SwitchA] display dhcp relay interface vlanif 100DHCP relay agent running information of interface Vlanif100 :Server IP address [00] : 10.10.20.2Gateway address in use : 10.20.20.1

# 在SwitchB上使用display ip pool name pool1命令用来查看IP地址池的分配情况，“Used”字段表示已经分配出去的IP地址数量。

[SwitchB] display ip pool name pool1Pool-name      : pool1Pool-No        : 0Lease          : 1 Days 0 Hours 0 MinutesDomain-name    : -Option-code    : 121Option-subcode : --Option-type    : hexOption-value   : 18640A1414141401DNS-server0    : -NBNS-server0   : -Netbios-type   : -Position       : Local           Status           : UnlockedGateway-0      : 10.20.20.1Network        : 10.20.20.0Mask           : 255.255.255.0VPN instance   : -------------------------------------------------------------------------------Start           End     Total  Used  Idle(Expired)  Conflict  Disable-----------------------------------------------------------------------------10.20.20.1    10.20.20.254   253     1        252(0)         0        0-----------------------------------------------------------------------------

配置文件

SwitchA的配置文件

#
sysname SwitchA
#
vlan batch 100 200
#
dhcp enable
#
interface Vlanif100ip address 10.20.20.1 255.255.255.0dhcp select relaydhcp relay server-ip 10.10.20.2
#
interface Vlanif200ip address 10.10.20.1 255.255.255.0
#
interface GigabitEthernet0/0/1port link-type hybridport hybrid pvid vlan 200port hybrid untagged vlan 200
#
interface GigabitEthernet0/0/2port link-type hybridport hybrid pvid vlan 100port hybrid untagged vlan 100
#
ip route-static 0.0.0.0 0.0.0.0 10.10.20.2
#
return

SwitchB的配置文件

#
sysname SwitchB
#
vlan batch 200
#
dhcp enable
#
ip pool pool1gateway-list 10.20.20.1network 10.20.20.0 mask 255.255.255.0option121 ip-address 10.10.20.0 24 10.20.20.1
#
interface Vlanif200ip address 10.10.20.2 255.255.255.0dhcp select global
#
interface GigabitEthernet0/0/1port link-type hybridport hybrid pvid vlan 200port hybrid untagged vlan 200
#
ip route-static 10.20.20.0 255.255.255.0 10.10.20.1
#
return

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