SNR S2989G-24TX-POE — dHCP Client and Server Configuration Guide for Network Management [200/553]
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SNR S2989G-24TX-POE — dHCP Client and Server Configuration Guide for Network Management [200/553]

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SNR S2989G-48TX-RPS [200/553] Dhcp server configuration
S2989G-24TX Operation Manual
Chapter 3 IP services Configuration
3-38
DHCP client and DHCP server. The implementation of DHCP is shown below:
Discover
Offer
Request
Ack
DHCP CLIENT
DHCP SERVER
Figure 3-9 DHCP protocol interaction
Explanation:
DHCP client broadcasts DHCPDISCOVER packets in the local subnet.
On receiving the DHCPDISCOVER packet, DHCP server sends a DHCPOFFER
packet along with IP address and other network parameters to the DHCP client.
DHCP client broadcast DHCPREQUEST packet with the information for the DHCP
server it selected after selecting from the DHCPOFFER packets.
The DHCP server selected by the client sends a DHCPACK packet and the client gets
an IP address and other network configuration parameters.
The above four steps finish a Dynamic host configuration assignment process.
However, if the DHCP server and the DHCP client are not in the same network, the server
will not receive the DHCP broadcast packets sent by the client, therefore no DHCP
packets will be sent to the client by the server. In this case, a DHCP relay is required to
forward such DHCP packets so that the DHCP packets exchange can be completed
between the DHCP client and server.
Switch can act as both a DHCP server and a DHCP relay. DHCP server supports not
only dynamic IP address assignment, but also manual IP address binding (i.e. specify a
specific IP address to a specified MAC address or specified device ID over a long period.
The differences and relations between dynamic IP address allocation and manual IP
address binding are: 1) IP address obtained dynamically can be different every time;
manually bound IP address will be the same all the time. 2) The lease period of IP address
obtained dynamically is the same as the lease period of the address pool, and is limited;
the lease of manually bound IP address is theoretically endless. 3) Dynamically allocated
address cannot be bound manually. 4) Dynamic DHCP address pool can inherit the
network configuration parameters of the dynamic DHCP address pool of the related
segment.
3.14.2
DHCP Server Configuration
DHCP Sever Configuration Task List:

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Learn about the DHCP client-server interaction process, including dynamic IP assignment and manual binding. Understand the role of DHCP relays and configuration tasks.