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CloudEngine 16800, 12800, 9800, 8800, 7800, 6800, and 5800 Series Switches Typical Configuration Examples (V100 and V200)

Example for Configuring a DHCP Relay Agent

Example for Configuring a DHCP Relay Agent

Applicable Products and Versions

  • This example applies to all models and all versions.
  • For details about the mapping between software versions and switch models, see the Hardware Query Tool.

Networking Requirements

As shown in Figure 2-24, an enterprise uses a DHCP server to assign IP addresses to servers in the data center. The server at 10.20.20.0/24 is used as an example to describe how to configure a DHCP relay agent.

The enterprise client is on the network segment 10.20.20.0/24, and the DHCP server is on the network segment 10.10.10.0/24. The DHCP clients can obtain IP addresses from the DHCP server through SwitchA enabled with DHCP relay.

The uplink interface of SwitchA is 10GE1/0/2, the address of VLANIF 200 is 10.10.20.1/24, and the interface address of SwitchA connected to the peer device is 10.10.20.2/24.

The public address of the DHCP server is 10.10.10.1/24 and the interface address of the DHCP server connected to the peer device is 10.10.10.2/24.

Figure 2-24 DHCP relay agent

Configuration Roadmap

The configuration roadmap is as follows:

  1. Create a DHCP server group on Switch A, and add a DHCP server to this group.
  2. Enable DHCP relay on VLANIF 100.
  3. Bind VLANIF 100 to the DHCP server group.

Procedure

  1. Add 10GE1/0/2 on SwitchA to VLAN 200.

    <Huawei> system-view
[~Huawei] sysname SwitchA
[*Huawei] commit
[~SwitchA] vlan batch 200
[*SwitchA] interface 10ge 1/0/2
[*SwitchA-10GE1/0/2] port link-type trunk
[*SwitchA-10GE1/0/2] port trunk allow-pass vlan 200
[*SwitchA-10GE1/0/2] quit
[*SwitchA] interface vlanif 200
[*SwitchA-Vlanif200] ip address 10.10.20.1 24
[*SwitchA-Vlanif200] quit
[*SwitchA] commit

  2. Configure the DHCP relay function on SwitchA.
    1. Create a DHCP server group and add DHCP servers to the group.

      # Create a DHCP server group.

      [~SwitchA] dhcp relay server group dhcpgroup1

      # Add a DHCP server to the DHCP server group.

      [*SwitchA-dhcp-relay-server-group-dhcpgroup1] server 10.10.10.1
[*SwitchA-dhcp-relay-server-group-dhcpgroup1] quit
[*SwitchA] commit

    2. Enable DHCP relay on the interface.

      # Create a VLAN and add 10GE1/0/1 to the VLAN.

      [~SwitchA] vlan batch 100
[*SwitchA] interface 10ge 1/0/1
[*SwitchA-10GE1/0/1] port default vlan 100
[*SwitchA-10GE1/0/1] quit
[*SwitchA] commit

      # Enable DHCP globally and DHCP relay on the interface.

      [~SwitchA] dhcp enable
[*SwitchA] interface vlanif 100
[*SwitchA-Vlanif100] dhcp select relay 
[*SwitchA-Vlanif100] quit
[*SwitchA] commit

    3. Bind an interface to a DHCP server group.

      # Assign IP addresses to interfaces.

      [~SwitchA] interface vlanif 100
[*SwitchA-Vlanif100] ip address 10.20.20.1 24

      Bind the interface to the DHCP server group.

      [*SwitchA-Vlanif100] dhcp relay binding server group dhcpgroup1
[*SwitchA-Vlanif100] quit
[*SwitchA] commit

  3. Configure a default route on SwitchA.

    [~SwitchA] ip route-static 0.0.0.0 0.0.0.0 10.10.20.2
[*SwitchA] commit

Example

# Run the display dhcp relay command on SwitchA to view the DHCP relay configuration on the interface.

[~SwitchA] display dhcp relay interface vlanif 100
 DHCP relay agent running information of interface Vlanif100 :                  
 Server group name          : dhcpgroup1                                        
 Gateway address in use     : 10.20.20.1

Configuration Files

Configuration file of SwitchA

#
sysname SwitchA
#
vlan batch 100 200
#
dhcp enable
#
dhcp relay server group dhcpgroup1
 server 10.10.10.1 0
#
interface Vlanif100
 ip address 10.20.20.1 255.255.255.0
 dhcp select relay
 dhcp relay binding server group dhcpgroup1
#
interface Vlanif200
 ip address 10.10.20.1 255.255.255.0
#
interface 10GE1/0/1
 port default vlan 100
#
interface 10GE1/0/2
 port link-type trunk
 port trunk allow-pass vlan 200
#
ip route-static 0.0.0.0 0.0.0.0 10.10.20.2                                    
#                                                                               
return