80
Task Command
Display DHCP client information.
display dhcp client
[
verbose
] [
interface
interface-type
interface-number ]
DHCP client configuration example
Network requirements
As shown in Figure 34, Router B contacts the DHCP server through GigabitEthernet 2/0/1 to obtain
an IP address, a DNS server address, and static route information. The DHCP client's IP address
resides on subnet 10.1.1.0/24. The DNS server address is 20.1.1.1. The next hop of the static route
to subnet 20.1.1.0/24 is 10.1.1.2.
The DHCP server uses Option 121 to assign static route information to DHCP clients. Figure 33
sho
ws the Option 121 format. The destination descriptor field contains the following parts: subnet
mask length and destination network address, both in hexadecimal notation. In this example, the
destination descriptor is 18 14 01 01 (the subnet mask length is 24 and the network address is
20.1.1.0 in dotted decimal notation). The next hop address is 0A 01 01 02 (10.1.1.2 in dotted decimal
notation).
Figure 33 Option 121 format
Figure 34 Network diagram
Configuration procedure
1. Configure Router A:
# Specify the IP address of GigabitEthernet 2/0/1.
<RouterA> system-view
[RouterA] interface gigabitethernet 2/0/1
[RouterA-GigabitEthernet2/0/1] ip address 10.1.1.1 24
[RouterA-GigabitEthernet2/0/1] quit
# Enable DHCP.
[RouterA] dhcp enable
# Exclude an IP address from dynamic allocation.
Router B
DHCP Client
DNS server
Router A
DHCP server
GE2/0/1
10.1.1.1/24
GE2/0/1
Router C
10.1.1.2/24 20.1.1.2/24
20.1.1.1/24
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