Configuring Dhcp Snooping - H3C S7500 Series Operation Manual

Operation Manual – DHCP
H3C S7500 Series Ethernet Switches
DHCP Client DHCP Client DHCP Client
DHCP Client DHCP Client DHCP Client
Figure 4-1 Typical network diagram for DHCP snooping applicatio
Figure 4-2
DHCP client
Figure 4-2 Interaction between a DHCP client and a DHCP server
DHCP snooping listens to the following two types of packets to retrieve the IP
addresses the DHCP clients obtain from DHCP servers and the MAC addresses of the
DHCP clients:
DHCP-ACK packet
DHCP-REQUEST packet

4.1.2 Configuring DHCP Snooping

Follow these steps to configure the DHCP snooping function:
DHCP Client DHCP Client DHCP Client
Switch A Switch A Switch A
(DHCP Snooping) (DHCP Snooping) (DHCP Snooping)
DHCP Client DHCP Client DHCP Client
illustrates the interaction between a DHCP client and a DHCP server.
DHCP-DISCOVER
DHCP-OFFER
DHCP-REQUEST
DHCP-ACK
DHCP-REQUEST(renew)
DHCP-ACK
Chapter 4 DHCP Snooping Configuration
DHCP Server DHCP Server
Internet Internet Internet
Switch B Switch B Switch B
(DHCP relay agent) (DHCP relay agent) (DHCP relay agent)
DHCP server
4-2
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