Manual

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163
(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 specified client when binding address
manually.
client-identifier <unique-identifier>
no client-identifier
Specify/delete the unique ID of the user
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.
23.3 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.
DHCP ServerDHCP Client
DHCPDiscover(Broadcast)
DHCPOFFER(Unicast)
DHCPREQUEST(Broadcast)
DHCPACK(Unicast)
DHCPDiscover
DHCP Relay
DHCPOFFER
DHCPREQUEST
DHCPACK
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.
The client broadcasts a DHCPDISCOVER packet, and DHCP relay inserts its own IP address