Related
Documentation
Example: Setting Up DHCP Option 82 on an EX Series Switch with No Relay Agent
Between Clients and DHCP Server on page 2898
•
•
Setting Up DHCP Option 82 with the Switch as a Relay Agent Between Clients and
DHCP Server (CLI Procedure) on page 2926
•
RFC 3046,
DHCP Relay Agent Information Option
, at
http://tools.ietf.org/html/rfc3046.
Example: Setting Up DHCP Option 82 on an EX Series Switch with No Relay Agent
Between Clients and DHCP Server
You can use DHCP option 82, also known as the DHCP relay agent information option,
to help protect the EX Series switch against attacks such as spoofing (forging) of IP
addresses and MAC addresses, and DHCP IP address starvation. Option 82 provides
information about the network location of a DHCP client, and the DHCP server uses this
information to implement IP addresses or other parameters for the client.
This example describes how to configure DHCP option 82 on a switch with DHCP clients,
DHCP server, and switch all on the same VLAN:
•
Requirements on page 2898
•
Overview and Topology on page 2899
•
Configuration on page 2900
Requirements
This example uses the following hardware and software components:
•
One EX Series switch
•
Junos OS Release 9.3 or later for EX Series switches
•
A DHCP server to provide IP addresses to network devices on the switch
Before you configure DHCP option 82 on the switch, be sure you have:
•
Connected and configured the DHCP server.
NOTE:
Your DHCP server must be configured to accept DHCP option 82.
If it is not configured for DHCP option 82, it does not use the DHCP option
82 information in the requests sent to it when it formulates its reply
messages.
•
Configured the
employee
VLAN on the switch and associated the interfaces on which
the clients and the server connect to the switch with that VLAN. See “Configuring
VLANs for EX Series Switches (CLI Procedure)” on page 1378.
Copyright © 2010, Juniper Networks, Inc.
2898
Complete Software Guide for Junos
®
OS for EX Series Ethernet Switches, Release 10.3
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...