Dhcp Relay - Dell PowerConnect 5500 Series System User's Manual

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DHCP Relay

This section describes DHCP relay.
It contains the following topics:
• DHCP Relay Overview
• Option 82
• Global Settings
• Interface Settings
DHCP Relay Overview
The device can act as a DHCP Relay agent that listens for DHCP messages,
and relays them between DHCP servers and clients, which reside in different
VLANs or IP subnets.
This functionality is intended to be used when the client ingress VLAN is
different than the VLAN on which DHCP servers are connected.
The switch can relay DHCP messages received from its IPv4 interfaces to one
or more configured DHCP servers. The switch puts the IPv4 address into the
message giaddr before relaying it to the servers. It uses the switch's IPv4
address of the interface where the message is received. The switch uses the
giaddr from the response to determine how to forward the response back to
the DHCP client.
DHCP Relay must be enabled globally and per VLAN.
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