3com S7906E Manuel De Montage

 

4-2 

z 

An interface can be configured to acquire an IP address in multiple ways, but these ways are 

mutually exclusive. The latest configuration will overwrite the previous one. 

z 

After the DHCP client is enabled on an interface, no secondary IP address can be configured for 

the interface. 

z 

If the IP address assigned by the DHCP server is on the same network segment as the IP 

addresses of other interfaces on the device, the DHCP client will not request any IP address from 

the DHCP server, unless you delete the conflicting IP address and bring up the interface again by 

first executing the shutdown command and then the undo shutdown command or re-enable the 

DHCP client on the interface by executing the undo ip address dhcp-alloc command and then 

the ip address dhcp-alloc command. 

 

Display specified 
configuration information 

display dhcp client [ verbose ] [ interface 
interface-type interface-number ] 

Available in any view 

 

As shown in 

, on a LAN, Switch B contacts the DHCP server via VLAN-interface 2 to obtain an 

IP address, DNS server address, and static route information. The IP address resides on network 

10.1.1.0/24. The DNS server address is 20.1.1.1. The next hop of the static route to network 20.1.1.0/24 

is 10.1.1.2. 

The DHCP server uses self-defined Option 121 to assign static route information to DHCP clients. The 

destination descriptor field comprises two parts, subnet mask length and destination network address. 

In this example, the value of the destination descriptor field takes 18 14 01 01, a hexadecimal number 

indicating that the subnet mask length is 24 and destination network address is 20.1.1.0, and the value 

of the next hop address field takes 0A 01 01 02, a hexadecimal number indicating that the next hop is 

10.1.1.2. 

Figure 4-1 Network diagram for DHCP client configuration example