Users Guide

1170 DHCP Server Settings
Dell EMC Networking N-Series switches support a DHCP client for
obtaining the switch address from the network, an IPv4 DHCP server for
serving IPv4 addresses to DHCP clients in the network, Layer-2 and Layer-3
DHCP relay for relaying IPv4 address assignments from network-based
DHCP servers to clients in the same or different subnets, and DHCP
snooping for protecting the switch and DHCP clients from certain security
risks.
How Does DHCP Work?
When a host connects to the network, the host’s DHCP client broadcasts a
message requesting information from any DHCP server that receives the
broadcast. One or more DHCP servers respond to the request. The response
includes the requested information, such as the IP address, subnet mask, and
default gateway IP address. The client accepts an offer from one of the
servers, and the server sends an acknowledgment to the client to confirm the
transaction.
Figure 30-1. Message Exchange Between DHCP Client and Server
The DHCP server maintains one or more set of IP addresses the and other
configuration information available, by request, to DHCP clients. Each set of
information is known as an address pool.
After a client leases an IP address from the DHCP server, the server adds an
entry to its database. The entry is called a binding.
`
DHCPDISCOVER (broadcast)
DHCPOFFER (unicast)
DHCPREQUEST (broadcast)
DHCPACK (unicast)
DHCP Client DHCP Server
(Dell EMC Networking
N-Series switch)