Maipu Administration Guide

Configure a DHCP Relay

Network Requirements

Device1 is the DHCP server, and the interface of Device2 enables the DHCP relay function.
The DHCP server provides the service for the client of the segment 1.0.0.0/24, and the first ten IP addresses are reserved.
The DHCP client gets the IP address via DHCP relay.

Network Topology

Networking for Configuring a DHCP Relay

Figure 3-3 Networking for Configuring a DHCP Relay

Configuration Steps

Step 1: Configure VLAN, and add the port to the corresponding VLAN. Configure the IP address of the interface (omitted).

Step 2: Configure the IP address pool of Device1 and the reserved IP address, and work in the DHCP server mode.

#Configure the DHCP server.

Device1(config)#interface vlan2
Device1(config-if-vlan2)#ip dhcp server
Device1(config-if-vlan2)#exit

#Configure the IP addresses of 1.0.0.1 to 1.0.0.10 not to be distributed.

Device1#configure terminal
Device1(config)#ip dhcp excluded-address 1.0.0.1 1.0.0.10

#Configure the IP address pool of Device1 dynamic-pool.

Device1(config)#ip dhcp pool dynamic-pool
Device1(dhcp-config)#network 1.0.0.0 255.255.255.0
Device1(dhcp-config)#default-router 1.0.0.1
Device1(dhcp-config)#lease 1 0 0
Device1(dhcp-config)#exit

#Configure the static route to the segment 1.0.0.0/24.

Device1(config)#ip route 1.0.0.0 255.255.255.0 2.0.0.2

Step 3: On the vlan3 interface of Device2, configure the address of the DHCP server as 2.0.0.1, and make the interface work in the relay mode.

Device2(config)#interface vlan3
Device2(config-if-vlan3)#ip dhcp relay
Device2(config-if-vlan3)#ip dhcp relay server-addres 2.0.0.1
Device2(config-if-vlan3)#exit

Step 4: Check the result.

#Query the information of the IP address distributed on Device1.

Device1#show ip dhcp pool dynamic-pool lease 
IP Address        MAC Address        Vendor Id       Type     Time Left(s) 
--------------    ---------------    -------------   -------  -----------
1.0.0.11          0001.7a6a.0268     Global          Lease    86387

Use the show ip dhcp pool dynamic-pool lease command to query the IP address that has been allocated to the client. The result shows that the client has obtained the IP address 1.0.0.12.