H3C LS-5100-16P-SI-OVS-H3 Configuration page 17

DHCP
H3C Low-End Ethernet Switches Configuration Examples
and the IRF Fabric are interconnected through the 172.16.2.4/30 network
segment.
Configure the address checking function on the DHCP relay agent so that only the
devices that are assigned legal IP addresses from the DHCP server are allowed to
access the external network.
Configure address entry update on the DHCP relay agent so that it updates the
address entries by sending requests to the DHCP server every one minute.
Enable DHCP snooping to support DHCP Option 82, adding local port information
to the Option 82 field in DHCP messages.
Enable the DHCP relay agent to support DHCP Option 82 so that the DHCP relay
agent keeps the original filed unchanged upon receiving DHCP messages
carrying Option 82.
Enable the DHCP server to support DHCP Option 82 so that it assigns the IP
addresses 192.168.10.2 through 192.168.10.25 to the DHCP clients connected to
Ethernet1/0/11 on the DHCP snooping switch and assigns 192.168.10.100
through 192.168.10.150 to the DHCP clients connected to Ethernet1/0/12 of the
DHCP snooping switch.
2.2.2 Network Diagram
Lab2
DHCP Snooping
Eth1/0/11
Figure 2-2 Network diagram for DHCP relay agent/snooping integrated configuration
SwitchA
(Master)
VLAN-int 25
192.168.19.1
IRF Fabric
DHCP Relay
SwitchD
(Unit4)
Eth1/0/1 VLAN-int 10
192.168.10.1
Eth1/0/13
Eth1/0/12
Office
Chapter 2 Configuration Examples
IP network
SwitchB
(Unit2)
SwitchC
(Unit3)
VLAN-int 17
Lab DHCP Server
172.16.2.4/30
VLAN-int 15
192.168.17.1
0010-5ce9-1dea
Lab1
2-5
Cisco Catalyst
3745
192.168.0.3
HQ