Application Example: DHCP Policies
Page 20-27
Application Example: DHCP Policies
This application example shows how Dynamic Host Configuration Protocol (
DHCP
) port and
MAC
address policies can be used in a
DHCP
-based network.
DHCP
is built on a client-server
model in which a designated
DHCP
server allocates network addresses and delivers configura-
tion parameters to dynamically configured clients.
Since
DHCP
clients initially have no
IP
address, placement of these clients in an AutoTracker
VLAN
presents a problem. AutoTracker determines
VLAN
membership by looking at traffic
from source devices. Since the first traffic transmitted from a source
DHCP
client does not
contain the actual address for the client (because the server has not allocated the address yet),
the client may not be placed in the same
VLAN
as its server.
Before the introduction of
DHCP
port and
MAC
address rules, various strategies were deployed
to use
DHCP
with Groups and
VLAN
s. Typically these strategies involved IP protocol and
network rules along with Bootp relay functionality. (See Chapter 24 for some application
examples of these strategies.) These solutions required that all
DHCP
clients in a particular
mobile group or
VLAN
be grouped together through a common IP policy.
DHCP
port and
MAC
address rules simplify the configuration of
DHCP
networks. Instead of
relying on IP-based policies to group all
DHCP
clients in the same network as a
DHCP
server,
you can manually place each individual
DHCP
client in the
VLAN
or mobile group of your
choice.
DHCP
port and
MAC
address policies operate the same way as standard port and
MAC
address policies except these new rules have been enhanced for use with
DHCP
clients.
The VLANs
This application example contains three (3) AutoTracker
VLAN
s within a single non-mobile
group. These
VLAN
s are called Test, Production, and Branch.
The Test
VLAN
connects to the main network, the Production
VLAN
, through an external
router. This
VLAN
is intended to be self-contained such that copies of it could be made and
attached to the Production
VLAN
in the same way this
VLAN
does. The Test
VLAN
contains its
own
DHCP
server and
DHCP
clients. The clients gain membership to the
VLAN
through
DHCP
port rules.
The Production
VLAN
carries most of the traffic in this network. It does not contain a
DHCP
server, but does contain
DHCP
clients that gain membership through
DHCP
port rules. Two
external routers connect this
VLAN
to the Test
VLAN
and a Branch
VLAN
. One of the external
routers—the one connected to the Branch
VLAN
—has Bootp relay functionality enabled. It is
through this router that the
DHCP
clients in the Production
VLAN
access the
DHCP
server in
the Branch
VLAN
.
The Branch
VLAN
contains a number of
DHCP
client stations and its own
DHCP
server. The
DHCP
clients gain membership to the
VLAN
through both
DHCP
port and
MAC
address rules.
The
DHCP
server allocates IP addresses to all clients in this
VLAN
as well as the
DHCP
clients
in the Production
VLAN
.
Summary of Contents for Omni Switch/Router
Page 1: ...Part No 060166 10 Rev C March 2005 Omni Switch Router User Manual Release 4 5 www alcatel com ...
Page 4: ...page iv ...
Page 110: ...WAN Modules Page 3 40 ...
Page 156: ...UI Table Filtering Using Search and Filter Commands Page 4 46 ...
Page 164: ...Using ZMODEM Page 5 8 ...
Page 186: ...Displaying and Setting the Swap State Page 6 22 ...
Page 202: ...Creating a New File System Page 7 16 ...
Page 270: ...Displaying Secure Access Entries in the MPM Log Page 10 14 ...
Page 430: ...OmniChannel Page 15 16 ...
Page 496: ...Configuring Source Route to Transparent Bridging Page 17 48 ...
Page 542: ...Dissimilar LAN Switching Capabilities Page 18 46 ...
Page 646: ...Application Example DHCP Policies Page 20 30 ...
Page 660: ...GMAP Page 21 14 ...
Page 710: ...Viewing the Virtual Interface of Multicast VLANs Page 23 16 ...
Page 722: ...Application Example 5 Page 24 12 ...
Page 788: ...Viewing UDP Relay Statistics Page 26 24 ...
Page 872: ...The WAN Port Software Menu Page 28 46 ...
Page 960: ...Deleting a PPP Entity Page 30 22 ...
Page 978: ...Displaying Link Status Page 31 18 ...
Page 988: ...Displaying ISDN Configuration Entry Status Page 32 10 ...
Page 1024: ...Backup Services Commands Page 34 14 ...
Page 1062: ...Diagnostic Test Cable Schematics Page 36 24 ...
Page 1072: ...Configuring a Switch with an MPX Page A 10 ...
Page 1086: ...Page B 14 ...
Page 1100: ...Page I 14 Index ...