Westermo RedFox Series - Manual (Page 514)

Westermo OS Management Guide
Version 4.17.0-0
Chapter 23
DHCP Relay Agent
This chapter describes WeOS DHCP Relay Agent support. For information on
WeOS DHCP Server support, see
chapter 22 .
DHCP Relay Agents relay DHCP messages between DHCP clients on a local LAN
to a central DHCP Server, usually located on a remote network. The two most
common reasons for using DHCP relay agents are:
❼ Centralised management: Deploying and managing a DHCP server on every
LAN in your network is cumbersome. By use of relay agents, a central DHCP
server can be used, and the management effort is substantially reduced.
Furthermore, if the relay agent is located in a router or switch on the local
LAN, there is no additional equipment cost.
❼ Assigning IP address per port (DHCP Option 82): In some topologies, you
may wish to assign IP addresses based on the switch port a DHCP client
connects to. By running a DHCP Relay Agent in the local switch/router, it
can include port information when forwarding the DHCP messages (DHCP
Option 82).
For redundancy purposes, the WeOS DHCP Relay Agent enables you to specify up
to two DHCP servers, to which the Relay Agent forwards incoming DHCP requests.
In case you wish to hand out addresses per port on the DHCP server unit (as
opposed to the DHCP relay agent), WeOS allows you to achieve this by running
a relay agent on the DHCP server unit, see the chapter on DHCP server (
sec-
tion 22.1.4 ).
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