Alcatel Omni Switch/Router, User Manual

Page: 771 / 1100

BOOTP/DHCP Relay
Page 26-7
Internal BOOTP/DHCP Relay
The internal
BOOTP/DHCP
relay is configured using the
UDP
forwarding feature in the switch,
available through the
relayc
command. See UDP Relay Configuration Screen on page 26-3.
Example 1
This application example shows a network with two AutoTracker Groups, each with multiple
segments. All network clients are
DHCP
-ready and the
DHCP
server resides on just one of the
groups. This example is much like the first application example, except that the
BOOTP
relay
function is configured inside the switch.
DHCP Clients in Two Groups
During initialization, each network client forwards a
DHCP
request frame to the
DHCP
server
using the local broadcast address. For those stations locally attached, the frame will simply be
switched.
In the example above, the
DHCP
server and clients in the same group must be members of
the same
VLAN
so that the policies match (they could also all be members of the default
VLAN
). One way to accomplish this is to use an IP protocol policy that places all IP frames in
the same
VLAN
. An IP network policy would not work in this case because the
DHCP
clients
will not have an IP network address until after they communicate with the
DHCP
server.
Omni Switch/Router
12345678
123456
Group 2
UDP Relay
130.0.0.21
DHCP Server
125.0.0.1
DHCP Clients
130.0.0.14
125.0.0.2
130.0.0.13
DHCP Client
12
5.0
.0.2
1
130.0.0.15
DHCP Client
Group 3