System information

Configuring the System
3-21
The DHCP client-server protocol enables devices on an IP network (the DHCP
clients) to request configuration information from a DHCP server. DHCP Relay
configures the BSR to forward UDP broadcasts, including IP address requests, from
DHCP clients.Configure the BSR to be a DHCP relay agent if you have locally
attached hosts and a distant DHCP or BOOTP server.
To configure the BSR for DHCP relay, do the following:
1. Enter Interface Configuration mode for the Ethernet interface.
MOT(config)#interface ethernet <x>/<y>
where:
x is the module slot number with an available Ethernet interface.
y is the Ethernet interface number.
2. Issue the the ip helper-address command in Interface Configuration mode to
forward default UDP broadcasts including IP configuration requests to the DHCP
server, as shown below:
MOT(config-if)#ip helper-address <A.B.C.D>
where:
A.B.C.D is the destination address.
Example
MOT(config-if)#ip helper-address 200.200.200.1
You can use the cable helper-address command in Interface Configuration mode
to configure DHCP relay on the cable interface. Refer to “Subneting DHCP
Clients on the Cable Interface” on page 6-1 for more information.
3. Enable the Ethernet interface and the configuration change with the no shutdown
command.
MOT(config-if)#no shutdown
4. Exit Interface Configuration mode.
MOT(config-if)#exit
5. Exit Global Configuration mode.
MOT(config)#exit