The following examples illustrate the
network environments where the DHCPv4 Relay Agent can be deployed.
DHCP Relay Deployments
Local DHCP Server
DHCP Client and DHCP Server 1 (172.20.1.100) are on
the same subnet (same broadcast domain). A DHCP Relay Agent is not required in this
scenario, because the server receives broadcast discover messages from the
client directly. A configured DHCP Relay Agent in this scenario is redundant because
the DHCP Relay Agent relays (unicast) the received DHCP packet again to the
destination DHCP Server or DHCP Client. As a result, both parties receive multiple
packets.
Remote DHCP Server
DHCP Clients and DHCP Server 2 (172.30.1.100)
are on different subnets but are directly linked through a DHCP Relay Agent.
DHCP Servers in a Network
DHCP Clients and DHCP Server
are on different subnets and connected through relay chaining (relay
multi-hops). This scenario is not depicted in the image.
Multiple DHCP Servers
DHCP Server 2 (172.30.1.100)
and DHCP Server 3 (172.10.1.100) are two server addresses on different subnets
configured at Router 1 (172.20.1.1) which is a DHCP Relay Agent.
DHCP Server in Different VRFs
DHCP Clients and DHCP Server are
on different VRFs. This scenario is not depicted in the image.
