3com 5500-ei pwr Installation Instruction

 

2-6 

Enter system view 

— 

interface interface-type 
interface-number 

dhcp select global 

Configure the 
current interface 

Configure the 
specified 
interface(s) or 
all the 
interfaces to 
operate in 
global address 
pool mode 

Configure multiple 
interfaces 
simultaneously in 
system view 

dhcp select global { interface 
interface-type interface-number [ to 
interface-type interface-number ] | 
all } 

Optional 

By default, the 
interface operates 
in global address 
pool mode.  

 

Follow these steps to create a DHCP address pool: 

Enter system view 

— 

Create a DHCP global address pool 
and enter its view 

dhcp server ip-pool 
pool-name 

Required 

Not created by default. 

 

 

You can configure either the static IP address allocation mode or the dynamic IP address allocation 

mode for a global address pool, and only one mode can be configured for one DHCP global address 

pool. 

 

For dynamic IP address allocation, you need to specify the range of the IP addresses to be dynamically 

assigned. But for static IP address binding, you can regard that the IP address statically bound to a 

DHCP client comes from a special DHCP address pool that contains only one IP address. 

Some DHCP clients, such as WWW servers, need fixed IP addresses. This can be achieved by binding 

IP addresses to the MAC addresses of these DHCP clients. When such a DHCP client requests an IP 

address, the DHCP server searches for the IP address corresponding to the MAC address of the DHCP 

client and assigns the IP address to the DHCP client.  

When some DHCP clients send DHCP-DISCOVER packets to the DHCP server to apply for IP 

addresses, they construct client IDs and add them in the DHCP-DISCOVER packets. If the bindings of 

client IDs and IP addresses are configured on the DHCP server, when such a client requests an IP 

address, the DHCP server will find the corresponding IP address based on the client ID and assign it to 

the DHCP client.