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Example for Configuring a DHCP Relay Agent (DHCP Relay Agent and DHCP Server on the Same Network)
Networking Requirements
In Figure 3-15, SwitchB functions as a DHCP server and resides on a different network segment from DHCP clients. In this networking example, the enterprise wants the DHCP server to dynamically allocate IP addresses to its clients.
Configuration Roadmap
The configuration roadmap is as follows:
Configure SwitchA as a DHCP relay agent to forward DHCP messages between the DHCP server and clients.
Procedure
- Configure DHCP relay on SwitchA.
# Add interfaces to VLANs.
<HUAWEI> system-view [HUAWEI] sysname SwitchA [SwitchA] vlan batch 100 200 [SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] port link-type hybrid [SwitchA-GigabitEthernet1/0/2] port hybrid pvid vlan 100 [SwitchA-GigabitEthernet1/0/2] port hybrid untagged vlan 100 [SwitchA-GigabitEthernet1/0/2] quit [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] port link-type hybrid [SwitchA-GigabitEthernet1/0/1] port hybrid pvid vlan 200 [SwitchA-GigabitEthernet1/0/1] port hybrid untagged vlan 200 [SwitchA-GigabitEthernet1/0/1] quit [SwitchA] interface vlanif 200 [SwitchA-Vlanif200] ip address 10.10.20.1 24 [SwitchA-Vlanif200] quit
# Enable the DHCP relay function on VLANIF 100.
[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
- Configure a default route on SwitchA.
[SwitchA] ip route-static 0.0.0.0 0.0.0.0 10.10.20.2
- Configure SwitchB as the DHCP server based on the global
address pool.
# Enable DHCP.
<HUAWEI> system-view [HUAWEI] sysname SwitchB [SwitchB] dhcp enable
# Configure VLANIF 200 to work in global address pool mode.
[SwitchB] vlan 200 [SwitchB-vlan200] quit [SwitchB] interface gigabitethernet 1/0/1 [SwitchB-GigabitEthernet1/0/1] port link-type hybrid [SwitchB-GigabitEthernet1/0/1] port hybrid pvid vlan 200 [SwitchB-GigabitEthernet1/0/1] port hybrid untagged vlan 200 [SwitchB-GigabitEthernet1/0/1] quit [SwitchB] interface vlanif 200 [SwitchB-Vlanif200] ip address 10.10.20.2 24 [SwitchB-Vlanif200] dhcp select global [SwitchB-Vlanif200] quit
# Create an address pool and set attributes for the address pool.
[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
- Configure a static route on SwitchB.
[SwitchB] ip route-static 10.20.20.0 255.255.255.0 10.10.20.1
- Verify the configuration.
# On SwitchA, run the display dhcp relay interface vlanif 100 command to view the configuration of the DHCP relay agent.
[SwitchA] display dhcp relay interface vlanif 100 DHCP relay agent running information of interface Vlanif100 : Server IP address [00] : 10.10.20.2 Gateway address in use : 10.20.20.1
# On SwitchB, run the display ip pool name pool1 command to view IP address allocation in the address pool. The Used field displays the number of used IP addresses in the address pool.
[SwitchB] display ip pool name pool1 Pool-name : pool1 Pool-No : 0 Lease : 1 Days 0 Hours 0 Minutes Domain-name : - Option-code : 121 Option-subcode : -- Option-type : hex Option-value : 18640A1414141401 DNS-server0 : - NBNS-server0 : - Netbios-type : - Position : Local Status : Unlocked Gateway-0 : 10.20.20.1 Network : 10.20.20.0 Mask : 255.255.255.0 VPN instance : -- Logging : Disable Conflicted address recycle interval: - Address Statistic: Total :253 Used :2 Idle :251 Expired :0 Conflict :0 Disabled :0 ------------------------------------------------------------------------------- Network section Start End Total Used Idle(Expired) Conflict Disabled ------------------------------------------------------------------------------- 10.20.20.1 10.20.20.254 253 2 251(0) 0 0 -------------------------------------------------------------------------------
Configuration Files
SwitchA configuration file
# sysname SwitchA # vlan batch 100 200 # dhcp enable # interface Vlanif100 ip address 10.20.20.1 255.255.255.0 dhcp select relay dhcp relay server-ip 10.10.20.2 # interface Vlanif200 ip address 10.10.20.1 255.255.255.0 # interface GigabitEthernet1/0/1 port link-type hybrid port hybrid pvid vlan 200 port hybrid untagged vlan 200 # interface GigabitEthernet1/0/2 port link-type hybrid port hybrid pvid vlan 100 port hybrid untagged vlan 100 # ip route-static 0.0.0.0 0.0.0.0 10.10.20.2 # return
SwitchB configuration file
# sysname SwitchB # vlan batch 200 # dhcp enable # ip pool pool1 gateway-list 10.20.20.1 network 10.20.20.0 mask 255.255.255.0 option121 ip-address 10.10.20.0 24 10.20.20.1 # interface Vlanif200 ip address 10.10.20.2 255.255.255.0 dhcp select global # interface GigabitEthernet1/0/1 port link-type hybrid port hybrid pvid vlan 200 port hybrid untagged vlan 200 # ip route-static 10.20.20.0 255.255.255.0 10.10.20.1 # return