Huawei Quidway S5600 Series Operation Manual page 136

Operation Manual - Management VLAN
Quidway S5600 Series Ethernet Switches-Release 1510
DHCP Client DHCP Client DHCP Client
DHCP Client DHCP Client DHCP Client
DHCP Client DHCP Client DHCP Client
DHCP Client DHCP Client DHCP Client
Figure 2-2 Interaction between a DHCP client and a DHCP server
To obtain valid dynamic IP addresses, a DHCP client exchanges different information
with the DHCP server in different phases. Usually, the following three modes are
involved:
1) The DHCP client accesses the network for the first time
In this case, the DHCP client goes through the following four phases to establish
connections with the DHCP server.
Discovery. The DHCP client discovers a DHCP server by broadcasting
DHCP_Discover packets in the network. Only the DHCP servers respond to this
type of packets.
Offer. Upon receiving DHCP_Discover packets, a DHCP server select an
available IP address from an address pool and sends a DHCP_Offer packet that
carries the selected IP address and other configuration information to the DHCP
client. The DHCP client only accepts the first-arrived DHCP_Offer packet (if there
are many DHCP servers), and broadcasts a DHCP_Request packet to each
DHCP server. The packet contains the IP address carried by the DHCP_Offer
packet.
Huawei Technologies Proprietary
2-2
Chapter 2 DHCP/BOOTP Client Configuration
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DHCP Server DHCP Server DHCP Server
DHCP Server DHCP Server DHCP Server
DHCP Server DHCP Server DHCP Server