46 
Step Command Remarks 
step. 
 
Configuring a static binding in a DHCP address pool 
Some DHCP clients, such as a WWW server, need fixed IP addresses. To provide a fixed IP address 
for a client, you can statically bind the MAC address or ID of the client to an IP address in a DHCP 
address pool. When the client requests an IP address, the DHCP server assigns the IP address in 
the static binding to the client. 
Follow these guidelines when you configure a static binding: 
•  One IP address can be bound to only one client MAC or client ID. You cannot modify bindings 
that have been created. To change the binding for a DHCP client, you must delete the existing 
binding first. 
•  The IP address of a static binding cannot be the address of the DHCP server interface. 
Otherwise, an IP address conflict occurs and the bound client cannot obtain an IP address 
correctly. 
•  Multiple interfaces on the same device might all use DHCP to request a static IP address. In this 
case, use client IDs rather than the device's MAC address to identify the interfaces. Otherwise, 
IP address allocation will fail. 
To configure a static binding: 
 
Step Command Remarks 
1.  Enter system view. 
system-view 
N/A 
2.  Create a DHCP address pool 
and enter its view. 
dhcp server ip-pool 
pool-name 
By default, no DHCP address 
pool exists. 
3.  Configure a static binding. 
static-bind ip-address
 ip-address 
[ mask-length | 
mask
 mask ]
 
{
 client-identifier 
client-identifier
 
| 
hardware-address 
hardware-address
 
[
 ethernet
 | 
token-ring 
] } 
By default, no static binding is 
configured. 
To add more static bindings, 
repeat this step. 
4.  (Optional.) Set the lease 
duration for the IP address. 
expired
 { 
day
 day [ 
hour
 hour 
[ 
minute
 minute [ 
second
 
second ] ] ] | 
unlimited
 } 
The default setting is 1 day. 
 
Specifying gateways for DHCP clients 
DHCP clients send packets destined for other networks to a gateway. The DHCP server can assign 
the gateway address to the DHCP clients. 
You can specify gateway addresses in each address pool on the DHCP server. A maximum of 64 
gateways can be specified in DHCP address pool view or secondary subnet view. 
The DHCP server assigns gateway addresses to clients on a secondary subnet in the following 
ways: 
•  If gateways are specified in both address pool view and secondary subnet view, DHCP assigns 
those specified in the secondary subnet view. 
•  If gateways are specified in address pool view but not in secondary subnet view, DHCP assigns 
those specified in address pool view. 
To configure gateways in the DHCP address pool: