Maipu Administration Guide

Configure a DHCP Server to Dynamically Allocate IP Addresses

Network Requirements

Two interface VLANs of Device, VLAN2 and VLAN3, are respectively configured with IP addresses in the 1.0.0.3/24 and 2.0.0.3/24 network segments.
The DHCP server Device dynamically allocates IP addresses in the 1.0.0.0/24 and 2.0.0.0.0/24 network segments to the two clients in the directly-connected physical network.
The IP addresses in network segment 1.0.0.0/24 have a one-day lease, the gateway address is 1.0.0.3, the DNS server address is 2.0.0.4. The IP addresses in network segment 2.0.0.0/24 have a three-day lease the gateway address is 2.0.0.3, the DNS server address is 2.0.0.4.
The first 10 IP addresses in network segments 1.0.0.0/24 are reserved and cannot be allocated.

Network Topology

Networking for Configuring DHCP to Dynamically Allocate IP Addresses

Figure 3-2 Networking for Configuring DHCP to Dynamically Allocate IP Addresses

Configuration Steps

Step 1: Configure the IP address of the interface of the device, and make the interface work in the DHCP server mode.

Device(config)#interface vlan2
Device(config-if- vlan2)#ip address 1.0.0.3 255.255.255.0
Device(config-if- vlan2)#ip dhcp server
Device(config-if- vlan2)#exit
Device(config)#interface vlan3
Device(config-if- vlan3)#ip address 2.0.0.3 255.255.255.0
Device(config-if- vlan3)#ip dhcp server
Device(config-if- vlan3)#exit

Step 2: On the DHCP server Device, configure two dynamic address pools and their parameters.

#Configure the first 10 IP addresses in the two address pools as the reserved addresses.

Device(config)#ip dhcp excluded-address 1.0.0.1 1.0.0.10
Device(config)#ip dhcp excluded-address 2.0.0.1 2.0.0.10

#Configure the address pool named dynamic-pool1 and the parameters (address range, gateway, dns address, and address lease).

Device(config)#ip dhcp pool dynamic-pool1
Device(dhcp-config)#network 1.0.0.0 255.255.255.0
Device(dhcp-config)#default-router 1.0.0.3
Device(dhcp-config)#dns-server 2.0.0.4
Device(dhcp-config)#lease 1 0 0
Device(dhcp-config)#exit

#Configure the address pool named dynamic-pool2 and the parameters (address range, gateway, dns address, and address lease).

Device(config)#ip dhcp pool dynamic-pool2
Device(dhcp-config)#network 2.0.0.0 255.255.255.0
Device(dhcp-config)#default-router 2.0.0.3
Device(dhcp-config)#dns-server 2.0.0.4
Device(dhcp-config)#lease 3 0 0
Device(dhcp-config)#exit

Step 3: Check the result.

#Query the information of the associated address pool of the server on Device.

Device#show ip dhcp server interface vlan2
DHCP server status information: 
DHCP server is enabled on interface: vlan2
Vrf : global 
DHCP server pool information:
Available directly-connected pool: 
Interface IP      Pool name           Pool Range              Pool utilization
-------------     ---------------     --------------------    -------------- 
1.0.0.3/24        dynamic-pool1       1.0.0.0 – 1.0.0.255     0.00% 
Device#show ip dhcp server interface vlan3
DHCP server status information: 
DHCP server is enabled on interface: vlan3
Vrf : global 
DHCP server pool information:
Available directly-connected pool: 

Interface IP      Pool name           Pool Range              Pool utilization
-------------     ---------------     --------------------    -------------- 
1.0.0.3/24       dynamic-pool2        2.0.0.0 – 2.0.0.255     0.00%

#Query the IP address information distributed for the client on Device.

Device#show ip dhcp pool danymic-pool1 lease 
IP Address        MAC Address        Vendor Id       Type    Time Left(s)
--------------    ------------------ ------------    ------  ----------- 
1.0.0.11          0001.7a6a.0268     Global          Lease   86390
Device#show ip dhcp pool danymic-pool2 lease 
IP Address        MAC Address        Vendor Id       Type    Time Left(s) 
--------------    ------------------ ------------    ------  ----------- 
2.0.0.11          0001.7a6a.0269     Global          Lease   259194

#Query the distribution statistics information of the configured IP address pool on Device.

Device#show ip dhcp pool dynamic-pool1 summary
Pool: dynamic-pool1 
Pool Configuration  : 1.0.0.0 255.255.255.0
Pool Range          : 1.0.0.0   1.0.0.255
Pool Utilization..... 0.39% 
VRF                 : global
DNS Server          : 2.0.0.4
Default Router      : 1.0.0.3  
Lease Time          : 1 Days 0 Hours 0 Minutes
Free Addresses      : 243 
Static Bind         : 0
Lease Count         : 1
PingList            : 0
OfferList           : 0
ConflictList        : 0
ExcludeList         : 12 
 
Device#show ip dhcp pool dynamic-pool2 summary
Pool: dynamic-pool2 
Pool Configuration  : 2.0.0.0 255.255.255.0
Pool Range          : 2.0.0.0   2.0.0.255
Pool Utilization..... 0.39% 
VRF                 : global
DNS Server          : 2.0.0.4
Default Router      : 2.0.0.3  
Lease Time          : 3 Days 0 Hours 0 Minutes
Free Addresses      : 243 
Static Bind         : 0
Lease Count         : 1
PingList            : 0
OfferList           : 0
ConflictList        : 0
ExcludeList         : 12

On the DHCP client, query whether the IP addresses have been obtained properly.

caution

The IP address in the address pool should belong to the segment range of the interface providing the service.