Displaying And Maintaining The Dhcp Client; Dhcp Client Configuration Example - 3Com 4210G Series Configuration Manual

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.
After the DHCP client is enabled on an interface, no secondary IP address is configurable for the
interface.
If the IP address assigned by the DHCP server shares a network segment with the IP addresses
of other interfaces on the device, the DHCP client enabled interface will not request any IP
address of the DHCP server, unless the conflicted IP address is manually deleted and the
interface is made UP again by first executing the shutdown command and then the undo
shutdown command or the DHCP client is enabled on the interface by executing the undo ip
address dhcp-alloc and ip address dhcp-alloc commands in sequence.

Displaying and Maintaining the DHCP Client

To do...
Display specified
configuration information

DHCP Client Configuration Example

Network requirements
As shown in Figure
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 Option 121 to assign static route information to DHCP 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 7-1 Network diagram for DHCP client configuration example
Use the command...
display dhcp client [ verbose ] [ interface
interface-type interface-number ]
7-1, on a LAN, Switch A contacts the DHCP server via VLAN-interface 2 to obtain
7-2
Remarks
Available in any view