3com S7906E Guide De Référence

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By default, the DHCP server is enabled on an interface. 
Examples 
# Enable the DHCP server on VLAN-interface 1. 
<Sysname> system-view 
[Sysname] interface vlan-interface 1 
[Sysname-Vlan-interface1] dhcp select server global-pool 
dhcp server detect 
Syntax 
dhcp server detect 
undo dhcp server detect 
View 
System view 
Default Level 
2: System level 
Parameters 
None 
Description 
Use the dhcp server detect command to enable unauthorized DHCP server detection. 
Use the undo dhcp server detect command to disable the function. 
By default, the function is disabled. 
Examples 
# Enable unauthorized DHCP server detection. 
<Sysname> system-view 
[Sysname] dhcp server detect 
dhcp server forbidden-ip 
Syntax 
dhcp server forbidden-ip low-ip-address [ high-ip-address ] 
undo dhcp server forbidden-ip low-ip-address high-ip-address ] 
View 
System view 
Default Level 
2: System level