3com S7906E Manuel De Montage

 

2-6 

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Use the static-bind ip-address command together with static-bind mac-address or static-bind 

client-identifier to accomplish a static binding configuration. 

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In a DHCP address pool, if you execute the static-bind mac-address command before the 

static-bind client-identifier command, the latter will overwrite the former and vice versa. 

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If you use the static-bind ip-address, static-bind mac-address, or static-bind client-identifier 

command repeatedly in the DHCP address pool, the new configuration will overwrite the previous 

one. 

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The IP address of the static binding cannot be an interface address of the DHCP server. Otherwise, 

an IP address conflict may occur and the bound client cannot obtain an IP address correctly. 

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The ID of the static binding must be identical to the ID displayed by using the display dhcp client 

verbose command on the client. Otherwise, the client cannot obtain an IP address. 

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You need to configure the static binding of a DHCP client’s ID to IP address, or the static binding of 

a BOOTP client's MAC to IP address on the DHCP server; otherwise, the DHCP or BOOTP client 

cannot obtain a static IP address. 

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If the interfaces on a DHCP client share the same MAC address, you need to specify the client ID, 

rather than MAC address, in a static binding to identify the requesting interface; otherwise, the 

client may fail to obtain an IP address. 

 

You need to specify one and only one address range using a mask for the dynamic address allocation. 

To avoid address conflicts, the DHCP server excludes IP addresses used by the gateway or FTP server 

from dynamic allocation. 

You can specify the lease duration for a DHCP address pool different from others, and a DHCP address 

pool can only have the same lease duration. A lease does not enjoy the inheritance attribute. 

Follow these steps to configure dynamic address allocation for a common address pool: 

Enter system view 

— 

Enter common address pool 
view 

dhcp server ip-pool 
pool-name 

— 

Specify an IP address range 

network network-address 
[ mask-length | mask mask ] 

Required 

Not specified by default. 

Specify the address lease 
duration 

expired { day day [ hour hour 
[ minute minute ] ] | unlimited }

Optional 

One day by default. 

Return to system view 

— 

Exclude IP addresses from 
automatic allocation 

dhcp server forbidden-ip 
low-ip-address 
[ high-ip-address ] 

Optional 

Except IP addresses of the 
DHCP server interfaces, all 
addresses in the DHCP 
address pool are assignable by 
default.