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3com S7906E Manuel De Montage

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[SwitchA] dhcp server forbidden-ip 10.1.1.4 
[SwitchA] dhcp server forbidden-ip 10.1.1.126 
[SwitchA] dhcp server forbidden-ip 10.1.1.254 
# Configure DHCP address pool 0 (address range, client domain name suffix, and DNS server 
address). 
[SwitchA] dhcp server ip-pool 0 
[SwitchA-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0 
[SwitchA-dhcp-pool-0] domain-name aabbcc.com 
[SwitchA-dhcp-pool-0] dns-list 10.1.1.2 
[SwitchA-dhcp-pool-0] quit 
# Configure DHCP address pool 1 (address range, gateway, lease duration, and WINS server). 
[SwitchA] dhcp server ip-pool 1 
[SwitchA-dhcp-pool-1] network 10.1.1.0 mask 255.255.255.128 
[SwitchA-dhcp-pool-1] gateway-list 10.1.1.126 
[SwitchA-dhcp-pool-1] expired day 10 hour 12 
[SwitchA-dhcp-pool-1] nbns-list 10.1.1.4 
[SwitchA-dhcp-pool-1] quit 
# Configure DHCP address pool 2 (address range, gateway, and lease duration). 
[SwitchA] dhcp server ip-pool 2 
[SwitchA-dhcp-pool-2] network 10.1.1.128 mask 255.255.255.128 
[SwitchA-dhcp-pool-2] expired day 5 
[SwitchA-dhcp-pool-2] gateway-list 10.1.1.254 
3) Verification 
After the preceding configuration is complete, clients on networks 10.1.1.0/25 and 10.1.1.128/25 can 
obtain IP addresses on the corresponding network and other network parameters from Switch A. You 
can use the display dhcp server ip-in-use command on the DHCP server to view the IP addresses 
assigned to the clients. 
Self-Defined Option Configuration Example 
Network requirements 
As shown in 
, the DHCP client (Switch B) obtains an IP address and PXE server addresses 
from the DHCP server (Switch A). The IP address belongs to network segment 10.1.1.0/24. The PXE 
server addresses are 1.2.3.4 and 2.2.2.2. 
The DHCP server assigns PXE server addresses to DHCP clients through Option 43, a self-defined 
option. The format of Option 43 and that of the PXE server address sub-option are shown in 
and 
, respectively. The value of Option 43 configured on the DHCP server in this example is 
80 0B 00 00 02 01 02 03 04 02 02 02 02. The number 80 is the value of the sub-option type. The number 
0B is the value of the sub-option length. The numbers 00 00 are the value of the PXE server type. The 
number 02 indicates the number of servers. The numbers 01 02 03 04 02 02 02 02 indicate that the 
PXE server addresses are 1.2.3.4 and 2.2.2.2.