User's Manual

29-70
(3) Configure manual DHCP address pool parameters
Command
Explanation
DHCP Address Pool Mode
hardware-address <hardware-address>
[{Ethernet | IEEE802|<type-number>}]
no hardware-address
Specify/delete
the hardware address
when assigning address manually.
host <address> [<mask> |
<prefix-length> ]
no host
Specify/delete
the IP address to be
assigned to the spec
ified client when
binding address manually.
client-identifier <unique-identifier>
no client-identifier
Specify/delete the unique ID of the user
when binding address manually.
client-name <name>
no client-name
Configure/delete
a client name when
binding address manually.
3. Enable logging for address conflicts
Command
Explanation
Global Mode
ip dhcp conflict logging
no ip dhcp conflict logging
Enable/disable logging for DHCP address to
detect address conflicts.
Admin Mode
clear ip dhcp conflict <address | all >
Delete a single address conflict record or all
conflict records.
29.3 DHCP Relay Configuration
When the DHCP client and server are in different segments, DHCP relay is required to transfer DHCP packets.
Adding a DHCP relay makes it unnecessary to configure a DHCP server for each segment, one DHCP server
can provide the network configuration parameter for clients from multiple segments, which is not only
cost-effective but also management-effective.
Figure 29-2 DHCP relay
As shown in the above figure, the DHCP client and the DHCP server are in different networks, the DHCP
client performs the four DHCP steps as usual yet DHCP relay is added to the process.
DHCP ServerDHCP Client
DHCPDiscover(Broadcast)
DHCPOFFER(Unicast)
DHCPREQUEST(Broadcast)
DHCPACK(Unicast)
DHCPDiscover
DHCP Relay
DHCPOFFER
DHCPREQUEST
DHCPACK